Replace the C++ implementation with the Rust port

The Rust port (formerly gipfel-rs) is now the official successor to the FLTK/GSL C++ code base. This squashes the port into a single commit and removes the C++ sources (they remain in the git history below). Layout: crates/gipfel-core headless core: hills, panorama geometry, projections (maxima-generated derivatives), pure-Rust LM fit, gipfel: JPEG comment + EXIF I/O, profiles, stitching crates/gipfel-cli command-line tools (export, info, stitch, profiles) crates/gipfel-app Cosmic DE (libcosmic) GUI, binary name `gipfel` codegen/ maxima scripts + regen.sh for the projection code tests/ golden files + C++ reference harnesses (historical) The original README is kept for now; it will be updated to describe the Rust build. gipfel.dat, AUTHORS, ChangeLog and NEWS are unchanged.
author: Johannes Hofmann <Johannes.Hofmann@gmx.de> 2026-10-26 20:05:20 +0100
committer: Johannes Hofmann <Johannes.Hofmann@gmx.de> 2026-10-26 20:05:20 +0100
commit: 375d87a9b0ec1cf2fffd705adb870c86144d2400 (patch)
tree: 1e8e05e7cd58686628d0f4622622456613a42e4d
parent: 45425dd047b791fe63f13a46a3251c529cfffc94 (diff)
103 files changed, 27234 insertions, 5258 deletions
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/target
+harness/build
+*.tmp
+gipfel-app-bin.tar.gz
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..f8992c7
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,134 @@
+# AGENTS.md — gipfel-rs
+
+Guidance for AI coding agents working in this repository.
+
+## What this is
+
+`gipfel-rs` is a Rust port of **gipfel** (a mountain-photo annotator: you load a
+photo, mark known peaks, and it fits the camera viewpoint + lens distortion from
+the hill database). The original is C++/FLTK (`https://git.flpsed.org/gipfel`,
+cloned at `~/gipfel`). This port targets **Cosmic DE** (libcosmic) on Linux.
+
+The port is organized as milestones (M1 core → M5 polish); see `~/gipfel/plan.md`
+for the full plan and `~/gipfel-spikes/MEMO.md` for early UI-spike decisions.
+
+## Workspace layout
+
+```
+crates/gipfel-core/   headless computational core (no GUI, no native C deps)
+  hill.rs             hill DB: CSV load (Latin-1), duplicate marking
+  panorama.rs         viewpoint, geodesy, refraction, occlusion, visibility
+  projection/         rectilinear + cylindrical projections
+    generated/        maxima-generated symbolic functions (DO NOT hand-edit)
+  lsq.rs              pure-Rust Levenberg-Marquardt fit (was GSL; GSL removed)
+  metadata.rs         `gipfel:` JPEG comment + EXIF read/write
+  profile.rs          distortion profiles (FLTK prefs format, XDG data dir)
+  stitch.rs           cylindrical panorama resampling (ScanImage/Stitch port) + TIFF/JPEG out
+  track.rs            GPX track parser (hardened: no XXE, size cap)
+crates/gipfel-cli/    CLI: export-position, export-hills, info, stitch, profiles
+crates/gipfel-app/    libcosmic GUI app (binary name: `gipfel`)
+  main.rs             app state + Elm-style update/view + sidebar
+  viewport.rs         custom canvas Widget (image + markers + labels)
+  compass.rs          compass-strip orientation widget
+  dump.rs             off-screen image renderer (screen dump)
+codegen/              maxima scripts + regen.sh (regenerates projection/generated/)
+tests/                C++ reference harnesses (.cxx) + golden files
+```
+
+## Build & test
+
+```sh
+cargo build --release                 # app binary: target/release/gipfel
+cargo test --lib --test golden        # unit + golden tests (the main gate)
+cargo test --workspace                # everything incl. app-crate tests
+cargo clippy --workspace --all-targets
+```
+
+- **Rust edition 2021.** No pinned toolchain file.
+- **No native C dependencies** since GSL was replaced by a pure-Rust LM. The only
+  system libs are what libcosmic/wgpu need (Vulkan/GL, fontconfig).
+- The dev environment has **no reachable display server** — the GUI app compiles
+  but cannot be run here. Runtime UI verification is done by the user on a real
+  Wayland desktop. Do not assume you can launch `gipfel` to test it.
+
+## Golden tests — the critical invariant
+
+`crates/gipfel-core/tests/golden.rs` compares output against files in
+`tests/golden/` produced by the **original C++ build**. This is the contract that
+keeps the math faithful.
+
+- Fit tests (`fit_rectilinear_matches_c`, `fit_cylindrical_matches_c`): fitted
+  params within **1e-6 relative**, final projected coords within **1e-9 relative**.
+- Function-grid tests: ~1e-15 agreement on the maxima-generated derivatives.
+- Several golden tests **skip silently** if the hill DB is missing. They look for
+  the data file via `$GIPFEL_DATA`, then `$HOME/gipfel/gipfel.dat`. Set
+  `GIPFEL_DATA=/path/to/gipfel.dat` so they actually run (a skipped golden test
+  is a green test that verified nothing).
+- **Never edit `tests/golden/*` to make a failing test pass.** They are ground
+  truth from C++. If a golden test fails, your change altered behavior — fix the
+  code or understand the deviation.
+
+Regenerating goldens (only when the C++ reference changes):
+`tests/gen_golden.sh` — needs the built C++ tree (`$GIPFEL_SRC`, default
+`~/gipfel/src`), `$GIPFEL_DATA`, g++, GSL, maxima. The `.cxx` harnesses still use
+C++ GSL; that is intentional (they are the reference, not part of the Rust build).
+
+## Code generation (maxima)
+
+`crates/gipfel-core/src/projection/generated/*_funcs.rs` are **generated** from
+`codegen/lsq_{rectilinear,cylindrical}.mac` via `codegen/regen.sh` (needs maxima;
+optional rustfmt). The mathematical models (refraction, cone-visibility,
+distortion) and their symbolic derivatives are **frozen** — do not change the
+models. If you regenerate, re-run the golden tests immediately.
+
+## Hard compatibility constraints
+
+- **`gipfel.dat` CSV format** and the **`gipfel:` JPEG comment parameter string**
+  must stay byte-compatible with the C++ version (keys `nick`/`tilt` are kept in
+  the file even though the code renamed them to pitch/roll).
+- **Hill indices are stable handles.** `Panorama::hills` keeps insertion order;
+  `mark_duplicates` sorts an index permutation, never the vec. Track lists and
+  known-hill sets index into `hills`. Do not reorder `hills` in place.
+- **Terminology:** UI says "Pitch"/"Roll"; internal fields are `a_pitch`/`a_roll`;
+  hill elevation is `a_elev` (distinct from camera pitch). JPEG keys stay
+  `nick`/`tilt`.
+- Distortion profiles live in `$XDG_DATA_HOME/gipfel/distortion-profiles.prefs`
+  (FLTK prefs format, legacy auto-import). Keep the `%g`-style float formatting
+  (`profile::fmt_g`) matching C.
+
+## Code conventions
+
+- **Elm architecture** in the app: `update(&mut self, Message) -> Task` is one
+  flat, **exhaustive** `match` (no catch-all) — keep it exhaustive so new
+  `Message` variants are forced to be handled. Prefer extracting small helper
+  methods over a catch-all arm.
+- Shared helpers to reuse (don't duplicate): `slider_item()`, `pick_open`/
+  `pick_save` (file dialogs), `compass::newton_inverse` (scalar inverse
+  projection), `viewport::layout_label_y` (label layout shared by screen + dump).
+- Sidebar rows use `settings::item_row` with fixed-width labels when fields must
+  align to equal widths (see the Distortion section).
+- libcosmic is **pinned to git rev `430f3d4`** (see `crates/gipfel-app/Cargo.toml`)
+  and vendors iced 0.14.2. The correct nav-bar return type is
+  `cosmic::Action<Message>` (crate root), not `cosmic::app::Action`.
+- Rendering gotchas: the wgpu renderer draws in fixed layer order (use
+  `start_layer`/`end_layer` to force overlays above the image); keep strong
+  `Plain<P>` paragraph refs alive across the frame in widget `Tree` state.
+
+## Platform notes
+
+- **Linux / Cosmic first.** No Windows/macOS support yet.
+- A standalone Windows build is an open experiment. The main blocker (GSL) is
+  already removed. Remaining work: swap libcosmic's `xdg-portal` feature for
+  `rfd` (file dialogs), port the hill-DB search path (`/usr/share`, `$HOME` →
+  `dirs` + exe-relative) and font fallback, then get libcosmic itself to compile
+  for `x86_64-pc-windows-gnu` (upstream does not test Windows).
+
+## Do / Don't
+
+- ✅ Run `cargo test --lib --test golden` (with `GIPFEL_DATA` set) after any
+  change to the core math, projection, fit, metadata, or stitch code.
+- ✅ Keep the build warning-free (rustc `dead_code`/`unused_*` lints are the
+  signal; clippy may not be installed in every environment).
+- ❌ Don't hand-edit `projection/generated/` or `tests/golden/`.
+- ❌ Don't change the mathematical models or file formats.
+- ❌ Don't assume the GUI can be launched in this environment.
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..3a99088
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[workspace]
+resolver = "2"
+members = ["crates/gipfel-core", "crates/gipfel-cli", "crates/gipfel-app"]
+
+[workspace.dependencies]
+kamadak-exif = "0.6"
+quick-xml = { version = "0.41", default-features = false }
+tiff = "0.11"
+dirs = "6"
+image = { version = "0.25", default-features = false, features = ["jpeg", "tiff", "pnm"] }
+
+[profile.release]
+lto = true
+debug = 1
diff --git a/Makefile.am b/Makefile.am
deleted file mode 100644
index c8ee547..0000000
--- a/Makefile.am
+++ /dev/null
@@ -1,6 +0,0 @@
-SUBDIRS = src
-dist_doc_DATA = README NEWS
-
-EXTRA_DIST = gipfel.dat gipfel.spec
-gpsdir = $(datadir)/gipfel
-gps_DATA = gipfel.dat
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6099395
--- /dev/null
+++ b/README.md
@@ -0,0 +1,33 @@
+# gipfel-rs
+
+Rust port of [gipfel](https://git.flpsed.org/gipfel)'s computational core.
+
+- `crates/gipfel-core` — hills, panorama geometry, projections (maxima-generated
+  symbolic derivatives), pure-Rust Levenberg-Marquardt fit, `gipfel:` JPEG comment + EXIF I/O
+- `crates/gipfel-cli` — `export-position`, `export-hills`, `info`
+- `codegen/` — maxima scripts (`expr2rust.mac`) and `regen.sh`
+- `tests/` — C reference harnesses + golden files from the original C++ build
+
+```sh
+cargo test --lib --test golden     # unit + golden tests
+cargo run -p gipfel-cli -- info <img.jpg>
+```
+
+The Rust build has no native C dependencies. Regenerate goldens with
+`tests/gen_golden.sh` (needs the built C++ tree, which uses GSL; see
+`GIPFEL_SRC`/`GIPFEL_DATA` in the script).
+
+## gipfel-app (M2/M3)
+
+COSMIC desktop application: `cargo build --release -p gipfel-app` →
+`target/release/gipfel [image.jpg] [--data gipfel.dat]`.
+
+- Viewport: ctrl+wheel zoom (cursor-anchored), wheel/drag pan, fit/zoom buttons
+- Left-drag a flag to reposition (refits on release); middle-click or
+  double-click toggles a hill "known"; right-click → Find Peak / Hide-Unhide
+- Viewpoint / Find Peak pickers are searchable dialogs
+- Sidebar: compass dial, focal/pitch/roll/visibility/track sliders, viewpoint
+  lat/lon/height, distortion k0/k1/x0, projection, show-hidden
+- File menu: Open/Save (writes the `gipfel:` comment), Screen Dump (PNG/JPG
+  with markers burned in), Load Track (CSV: lat,lon,height rows)
+- Install `crates/gipfel-app/data/org.gipfel.App.desktop` per freedesktop
diff --git a/codegen/expr2rust.mac b/codegen/expr2rust.mac
new file mode 100644
index 0000000..e4e6be8
--- /dev/null
+++ b/codegen/expr2rust.mac
@@ -0,0 +1,31 @@
+/*
+ * Rust code generation for gipfel-rs.
+ *
+ * Port of gipfel's expr2c.mac (Copyright 2006-2009 Johannes Hofmann).
+ * Emits one Rust function per line (grep "^pub fn"); integer literals are
+ * converted to float literals by fixup.py afterwards.
+ */
+
+load("stringproc")$
+
+varsubst(v) := ssubst("_", "%", string(v))$
+
+printdecl(vars) := (
+	sprint("let mut", varsubst(first(vars)), ": f64 = 0.0;"),
+	for v in rest(vars) do sprint("let mut", varsubst(v), ": f64 = 0.0;"))$
+
+printdef(expr) := sprint(varsubst(first(expr)), "=", varsubst(second(expr)), ";")$
+
+block2rust(expr) :=
+	if ?equal(op(expr), block) then (
+		printdecl(first(expr)),
+		for d in reverse(rest(reverse(rest(expr)))) do printdef(d),
+		sprint("return", varsubst(last(expr)), ";"))
+	else
+		sprint("return", varsubst(expr), ";")$
+
+expr2rust(funcname, argstr, expr) := (
+	sprint("pub fn", funcname, "(", argstr, ") -> f64 {"),
+	block2rust(subst(pow, "^", optimize(expr))),
+	sprint("}", "
+"))$
diff --git a/codegen/fixup.py b/codegen/fixup.py
new file mode 100644
index 0000000..1131f11
--- /dev/null
+++ b/codegen/fixup.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+"""Post-process maxima output for Rust:
+ - convert bare integer literals to float literals (1 -> 1.0)
+ - drop maxima noise lines (keep only 'pub fn' lines)
+"""
+import re
+import sys
+
+pat = re.compile(r"(?<![\w.])-?\d+(?![\w.])")
+
+for line in sys.stdin:
+    if not line.startswith("pub fn"):
+        continue
+    sys.stdout.write(pat.sub(lambda m: m.group(0) + ".0", line))
diff --git a/codegen/lsq_cylindrical.mac b/codegen/lsq_cylindrical.mac
new file mode 100644
index 0000000..316d3f9
--- /dev/null
+++ b/codegen/lsq_cylindrical.mac
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
+ */
+
+/*
+ * cylindrical projection model
+ */
+
+x : m_view - c_view$
+y : tan(c_pitch - m_elev)$ 
+x_rot : y * sin(c_roll) + x * cos(c_roll)$
+y_rot : y * cos(c_roll) - x * sin(c_roll)$
+x_scale : x_rot * scale$
+y_scale : y_rot * scale$
+
+/*
+ * Some mangling for C code generation
+ */
+
+load("expr2rust.mac")$
+
+x_expand : trigexpand(x_scale)$
+y_expand : trigexpand(y_scale)$
+
+args: "c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64"$
+
+expr2rust("mac_x", args, x_expand)$
+expr2rust("mac_y", args, y_expand)$
+
+expr2rust("mac_x_dc_view", args, diff(x_expand, c_view))$
+expr2rust("mac_x_dc_pitch", args, diff(x_expand, c_pitch))$
+expr2rust("mac_x_dc_roll", args, diff(x_expand, c_roll))$
+expr2rust("mac_x_dscale", args, diff(x_expand, scale))$
+expr2rust("mac_y_dc_view", args, diff(y_expand, c_view))$
+expr2rust("mac_y_dc_pitch", args, diff(y_expand, c_pitch))$
+expr2rust("mac_y_dc_roll", args, diff(y_expand, c_roll))$
+expr2rust("mac_y_dscale", args, diff(y_expand, scale))$
+
diff --git a/codegen/lsq_rectilinear.mac b/codegen/lsq_rectilinear.mac
new file mode 100644
index 0000000..4dbb36a
--- /dev/null
+++ b/codegen/lsq_rectilinear.mac
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
+ */
+
+/*
+ * rectilinear (pinhole) projection model with distortion correction
+ */
+
+/* switch to cartesian coordinates */
+c_x : cos(m_elev) * cos(m_view - c_view)$
+c_y : cos(m_elev) * sin(m_view - c_view)$
+c_z : sin(m_elev)$
+
+/* pitch rotation */
+c_x_rot : cos(c_pitch) * c_x + sin(c_pitch) * c_z$
+c_y_rot : c_y$
+c_z_rot : -sin(c_pitch) * c_x + cos(c_pitch) * c_z$
+
+/* pinhole projection */
+x : c_y_rot / c_x_rot$
+y : -c_z_rot / c_x_rot$ 
+
+/* rotation around view axis */
+x_rot : y * sin(c_roll) + x * cos(c_roll) + x0$
+y_rot : y * cos(c_roll) - x * sin(c_roll)$
+
+/* distortion correction */
+d : sqrt(x_rot ^ 2 + y_rot ^ 2)$
+dist_fact : d ^ 2 * k1 + d * k0$
+x_dist : x_rot * (1 + dist_fact) * scale$
+y_dist : y_rot * (1 + dist_fact) * scale$
+
+/*
+ * Some mangling for C code generation
+ */
+
+load("expr2rust.mac")$
+
+x_expand : trigexpand(x_dist)$
+y_expand : trigexpand(y_dist)$
+
+args: "c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64"$
+
+expr2rust("mac_x", args, x_expand)$
+expr2rust("mac_y", args, y_expand)$
+
+expr2rust("mac_x_dc_view", args, diff(x_expand, c_view))$
+expr2rust("mac_x_dc_pitch", args, diff(x_expand, c_pitch))$
+expr2rust("mac_x_dc_roll", args, diff(x_expand, c_roll))$
+expr2rust("mac_x_dscale", args, diff(x_expand, scale))$
+expr2rust("mac_x_dk0", args, diff(x_expand, k0))$
+expr2rust("mac_x_dk1", args, diff(x_expand, k1))$
+expr2rust("mac_x_dx0", args, diff(x_expand, x0))$
+expr2rust("mac_y_dc_view", args, diff(y_expand, c_view))$
+expr2rust("mac_y_dc_pitch", args, diff(y_expand, c_pitch))$
+expr2rust("mac_y_dc_roll", args, diff(y_expand, c_roll))$
+expr2rust("mac_y_dscale", args, diff(y_expand, scale))$
+expr2rust("mac_y_dk0", args, diff(y_expand, k0))$
+expr2rust("mac_y_dk1", args, diff(y_expand, k1))$
+expr2rust("mac_y_dx0", args, diff(y_expand, x0))$
diff --git a/codegen/regen.sh b/codegen/regen.sh
new file mode 100755
index 0000000..dbf9f6b
--- /dev/null
+++ b/codegen/regen.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+# Regenerate the symbolic projection functions with maxima.
+# Run from anywhere; requires maxima (and rustfmt if available).
+set -e
+cd "$(dirname "$0")"
+OUT=../crates/gipfel-core/src/projection/generated
+
+for p in rectilinear cylindrical; do
+	maxima -b lsq_${p}.mac | python3 fixup.py > ${OUT}/${p}_funcs.rs
+done
+
+if command -v rustfmt >/dev/null; then
+	rustfmt ${OUT}/rectilinear_funcs.rs ${OUT}/cylindrical_funcs.rs 2>/dev/null || true
+fi
+echo "generated:"
+wc -l ${OUT}/*_funcs.rs
diff --git a/configure.ac b/configure.ac
deleted file mode 100644
index 1766ac2..0000000
--- a/configure.ac
+++ /dev/null
@@ -1,68 +0,0 @@
-#                                               -*- Autoconf -*-
-# Process this file with autoconf to produce a configure script.
-
-AC_PREREQ(2.59)
-AC_INIT(gipfel, 0.4.1, Johannes.Hofmann@gmx.de)
-AM_INIT_AUTOMAKE
-AC_CONFIG_SRCDIR([src/Panorama.H])
-AC_CONFIG_HEADER(config.h)
-
-CPPFLAGS="-Wall -g -I/usr/local/include -DSTD_DATADIR=\\\"$datadir\\\" -DDOCDIR=\\\"$docdir\\\" $CPPFLAGS"
-LDFLAGS="-g $LDFLAGS"
-
-# Checks for programs.
-AC_PROG_CXX
-AC_PROG_CC
-
-AC_LANG_CPLUSPLUS
-
-# Checks for libraries.
-
-# Checks for header files.
-AC_HEADER_STDC
-AC_HEADER_SYS_WAIT
-AC_CHECK_HEADERS([fcntl.h stdlib.h string.h unistd.h])
-
-# Checks for typedefs, structures, and compiler characteristics.
-AC_HEADER_STDBOOL
-AC_C_CONST
-AC_TYPE_OFF_T
-AC_TYPE_PID_T
-
-# Checks for library functions.
-AC_FUNC_FORK
-AC_FUNC_MALLOC
-AC_FUNC_REALLOC
-AC_TYPE_SIGNAL
-AC_CHECK_FUNCS([strchr strdup strrchr strstr mkstemp fsync strsep])
-
-# Check for fltk
-AC_PATH_PROG(FLTKCONFIG,fltk-config)
-if test "x$FLTKCONFIG" = x; then
-	echo "fltk-config not found"
-	exit 1
-fi
-
-CXXFLAGS="`$FLTKCONFIG --use-images --cflags` $CXXFLAGS"
-LIBS="`$FLTKCONFIG --use-images --ldflags` $LIBS"
-
-# Check for gsl
-AC_PATH_PROG(GSLCONFIG,gsl-config)
-if test "x$GSLCONFIG" = x; then
-	echo "gsl-config not found"
-	exit 1
-fi
-
-CXXFLAGS="`$GSLCONFIG --cflags` $CXXFLAGS"
-LIBS="`$GSLCONFIG --libs` $LIBS"
-
-# Check for libtiff
-AC_CHECK_HEADERS([tiffio.h], [], [echo "Error: tiffio.h not found."; exit 1;])
-AC_CHECK_LIB([tiff], [TIFFOpen], [], [echo "Error: libtiff.so not found."; exit 1;])
-
-# Check for exiv2
-AC_CHECK_HEADERS([exiv2/exif.hpp], [], [echo "Error: exiv2/exif.hpp not found."; exit 1;])
-LIBS="-lexiv2 $LIBS"
-
-AC_CONFIG_FILES([Makefile src/Makefile])
-AC_OUTPUT
diff --git a/crates/gipfel-app/Cargo.toml b/crates/gipfel-app/Cargo.toml
new file mode 100644
index 0000000..22589c1
--- /dev/null
+++ b/crates/gipfel-app/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "gipfel-app"
+version = "0.1.0"
+edition = "2021"
+description = "gipfel port to Cosmic DE"
+license = "GPL-2.0-or-later"
+
+[[bin]]
+name = "gipfel"
+path = "src/main.rs"
+
+[dependencies]
+gipfel-core = { path = "../gipfel-core" }
+libcosmic = { git = "https://github.com/pop-os/libcosmic.git", rev = "430f3d48a97d8779f9c1985473912e594ccca1ae", default-features = false, features = ["winit", "wgpu", "tokio", "a11y", "xdg-portal"] }
+image.workspace = true
+fontdue = "0.9"
+cosmic-text = "0.19"
+fontdb = "0.23"
+tokio = { version = "1", features = ["time"] }
diff --git a/crates/gipfel-app/data/org.gipfel.App.desktop b/crates/gipfel-app/data/org.gipfel.App.desktop
new file mode 100644
index 0000000..b20c468
--- /dev/null
+++ b/crates/gipfel-app/data/org.gipfel.App.desktop
@@ -0,0 +1,13 @@
+[Desktop Entry]
+Type=Application
+Name=gipfel
+GenericName=Panorama annotator
+Comment=Annotate mountain panoramas
+Exec=gipfel %U
+TryExec=gipfel
+Icon=org.gipfel.App
+Terminal=false
+Categories=Graphics;Photography;
+Keywords=mountain;panorama;photo;annotation;
+MimeType=image/jpeg;image/png;
+StartupNotify=true
diff --git a/crates/gipfel-app/src/compass.rs b/crates/gipfel-app/src/compass.rs
new file mode 100644
index 0000000..a17cd5c
--- /dev/null
+++ b/crates/gipfel-app/src/compass.rs
@@ -0,0 +1,611 @@
+//! Experimental compass strip: shows N/E/S/W at their projected positions
+//! relative to the view direction; drag horizontally to change the direction.
+//!
+//! Two experimental styles (switchable from the View menu):
+//! - `Aligned`: the strip shares the image's horizontal transform, so each
+//!   direction appears exactly above its position in the image. Grab-drag
+//!   keeps the direction under the cursor fixed.
+//! - `Ruler`: a fixed 0..360° ruler across the widget width; press or drag
+//!   sets the direction to the value under the cursor. The shaded band marks
+//!   the current horizontal field of view.
+//!
+//! Layout (top to bottom): direction labels, center marker, tick scale on a
+//! baseline. The whole strip sits on a secondary-container background so it
+//! is visually distinct from the image (pan) area.
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use cosmic::iced::advanced::graphics::geometry::Renderer as _;
+use cosmic::iced::advanced::renderer::Style as RendererStyle;
+use cosmic::iced::advanced::text::{self as adv_text, paragraph::Plain, LineHeight};
+use cosmic::iced::advanced::widget::{tree, Tree, Widget as WidgetTrait};
+use cosmic::iced::advanced::{Clipboard, Layout, Shell};
+use cosmic::iced::mouse::{self, Button, Cursor, Interaction};
+use cosmic::iced::widget::canvas::{Frame, Path, Stroke};
+use cosmic::iced::advanced::graphics::geometry::Style as GeoStyle;
+use cosmic::iced::{alignment, Color, Event, Length, Pixels, Point, Rectangle, Size};
+use cosmic::Renderer as R;
+use cosmic::Theme;
+
+use gipfel_core::projection::{
+    projection_from_type, Projection, ProjArgs, ProjectionType, ViewParams,
+};
+
+pub const STRIP_H: f32 = 56.0;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum CompassStyle {
+    Off,
+    Aligned,
+    Ruler,
+}
+
+/// inverse: azimuth whose image x is `x_img`, measured with `c_ref` as
+/// center angle. Analytic base inverse + damped Newton refinement so lens
+/// distortion is honoured.
+/// Damped, clamped Newton iteration for a scalar inverse projection: find
+/// `a` such that `f(a) ≈ target`. `f` returns `None` where the forward
+/// projection is undefined (the iteration stops there). The step is clamped
+/// to ±0.3 rad and `a` kept in `[lo, hi]` to stay off the projection poles.
+pub(crate) fn newton_inverse(
+    target: f64,
+    mut f: impl FnMut(f64) -> Option<f64>,
+    seed: f64,
+    lo: f64,
+    hi: f64,
+) -> f64 {
+    let mut a = seed.clamp(lo, hi);
+    for _ in 0..6 {
+        let Some(y) = f(a) else { break };
+        let resid = y - target;
+        let h = 1e-5;
+        let (Some(y1), Some(y2)) = (f(a + h), f(a - h)) else {
+            break;
+        };
+        let d = (y1 - y2) / (2.0 * h);
+        if !d.is_finite() || d.abs() < 1e-9 {
+            break;
+        }
+        let step = (resid / d).clamp(-0.3, 0.3);
+        a = (a - step).clamp(lo, hi);
+        if step.abs() < 1e-10 {
+            break;
+        }
+    }
+    a
+}
+
+pub fn alph_at_img_x(
+    ptype: ProjectionType,
+    proj: &dyn Projection,
+    parms: &ViewParams,
+    x_img: f64,
+    c_ref: f64,
+) -> f64 {
+    let mut p = *parms;
+    p.a_center = c_ref;
+    // analytic base inverse (ignores distortion); Newton refines it
+    let seed = match ptype {
+        ProjectionType::Rectilinear => c_ref + (x_img / p.scale).atan(),
+        ProjectionType::Cylindrical => c_ref + x_img / p.scale,
+    };
+    // rectilinear has a pole at |alph - center| = 90°; keep Newton inside
+    let (lo, hi) = match ptype {
+        ProjectionType::Rectilinear => (c_ref - 1.55, c_ref + 1.55),
+        ProjectionType::Cylindrical => (c_ref - 3.1, c_ref + 3.1),
+    };
+    newton_inverse(
+        x_img,
+        |a| Some(proj.mac_x(ProjArgs::from_params(&p, a, 0.0))),
+        seed,
+        lo,
+        hi,
+    )
+}
+
+pub struct Compass<M: Clone + Send + 'static> {
+    pub style: CompassStyle,
+    pub center_deg: f64,
+    pub zoom: f32,
+    pub pan_x: f32,
+    pub parms: ViewParams,
+    pub ptype: ProjectionType,
+    /// horizontal field of view of the image, degrees (Ruler shading)
+    pub fov_deg: f64,
+    /// lens field-of-view half-angle limit in radians (0 = none). Ticks and
+    /// direction labels beyond this are dropped: a distortion model can fold
+    /// out-of-view directions back onto the strip, showing bogus ticks.
+    pub max_view_angle: f64,
+    pub on_change: Rc<dyn Fn(f64) -> M>,
+}
+
+impl<M: Clone + Send + 'static> Clone for Compass<M> {
+    fn clone(&self) -> Self {
+        Compass {
+            style: self.style,
+            center_deg: self.center_deg,
+            zoom: self.zoom,
+            pan_x: self.pan_x,
+            parms: self.parms,
+            ptype: self.ptype,
+            fov_deg: self.fov_deg,
+            max_view_angle: self.max_view_angle,
+            on_change: self.on_change.clone(),
+        }
+    }
+}
+
+#[derive(Default)]
+struct CompassState {
+    /// (press x, center angle at press)
+    drag: Option<(f32, f64)>,
+    /// strong refs: the text pipeline only keeps a Weak to each paragraph
+    paragraphs: RefCell<Vec<Plain<<R as adv_text::Renderer>::Paragraph>>>,
+}
+
+const DIRS: [(f64, &str); 8] = [
+    (0.0, "N"),
+    (45.0, "NE"),
+    (90.0, "E"),
+    (135.0, "SE"),
+    (180.0, "S"),
+    (225.0, "SW"),
+    (270.0, "W"),
+    (315.0, "NW"),
+];
+
+/// one text to draw: content, x, y, center around x?, color
+struct Txt {
+    text: String,
+    x: f32,
+    y: f32,
+    centered: bool,
+    color: Color,
+}
+
+fn stroke_tick(frame: &mut Frame<R>, x: f32, y0: f32, h: f32, w: f32, color: Color) {
+    if !x.is_finite() {
+        return;
+    }
+    // snap thin lines to integer coords for crisp 1 px strokes
+    let x = if w < 1.5 { x.round() } else { x };
+    let p = Path::new(|p| {
+        p.move_to(Point::new(x, y0));
+        p.line_to(Point::new(x, y0 - h));
+    });
+    frame.stroke(
+        &p,
+        Stroke {
+            width: w,
+            style: GeoStyle::Solid(color),
+            ..Default::default()
+        },
+    );
+}
+
+impl<M: Clone + Send + 'static> Compass<M> {
+    /// image-space x of azimuth `alph` (on the horizon), current parms
+    fn x_img_at(&self, proj: &dyn Projection, alph: f64) -> f64 {
+        proj.get_coordinates(alph, 0.0, &self.parms).0
+    }
+
+    fn alph_at_img_x(
+        &self,
+        proj: &dyn Projection,
+        x_img: f64,
+        c_ref: f64,
+    ) -> f64 {
+        alph_at_img_x(self.ptype, proj, &self.parms, x_img, c_ref)
+    }
+
+    /// screen x of the image center for the Aligned style
+    fn center_x(&self, b: Rectangle) -> f32 {
+        b.x + b.width / 2.0 + self.pan_x
+    }
+}
+
+impl<M: Clone + Send + 'static> WidgetTrait<M, Theme, R> for Compass<M> {
+    fn size(&self) -> Size<Length> {
+        Size::new(Length::Fill, Length::Fixed(STRIP_H))
+    }
+
+    fn tag(&self) -> tree::Tag {
+        tree::Tag::of::<CompassState>()
+    }
+
+    fn state(&self) -> tree::State {
+        tree::State::new(CompassState::default())
+    }
+
+    fn layout(
+        &mut self,
+        _tree: &mut Tree,
+        _renderer: &R,
+        limits: &cosmic::iced::advanced::layout::Limits,
+    ) -> cosmic::iced::advanced::layout::Node {
+        cosmic::iced::advanced::layout::Node::new(Size::new(limits.max().width, STRIP_H))
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut R,
+        theme: &Theme,
+        _style: &RendererStyle,
+        layout: Layout<'_>,
+        _cursor: Cursor,
+        _viewport: &Rectangle,
+    ) {
+        use cosmic::iced::advanced::text::Renderer as _;
+
+        let b = layout.bounds();
+        let _ = theme;
+        // dark instrument panel, clearly distinct from the image area
+        let on: Color = Color::from_rgb(0.85, 0.85, 0.85);
+        let bg: Color = Color::from_rgb(0.16, 0.16, 0.16);
+        let divider: Color = Color::from_rgb(0.32, 0.32, 0.32);
+        let red = Color::from_rgb(1.0, 0.4, 0.25);
+
+        // geometry rows (snapped so lines stay crisp)
+        let label_y = (b.y + 5.0).round();
+        let y0 = (b.y + STRIP_H - 10.0).round(); // baseline
+        let tri_y = (b.y + 25.0).round();
+        let z = self.zoom;
+        let proj = projection_from_type(self.ptype);
+
+        let mut texts: Vec<Txt> = Vec::new();
+        let mut frame = Frame::with_bounds(renderer, b);
+
+        // panel background + top divider: clearly a separate, draggable area
+        let panel = Path::new(|p| p.rectangle(b.position(), b.size()));
+        frame.fill(&panel, bg);
+        let sep = Path::new(|p| {
+            p.move_to(Point::new(b.x, b.y + 0.5));
+            p.line_to(Point::new(b.x + b.width, b.y + 0.5));
+        });
+        frame.stroke(
+            &sep,
+            Stroke {
+                width: 1.0,
+                style: GeoStyle::Solid(divider),
+                ..Default::default()
+            },
+        );
+
+        match self.style {
+            CompassStyle::Off => return,
+            CompassStyle::Aligned => {
+                let cx = self.center_x(b);
+                let c = self.parms.a_center;
+                // pixels per degree at the center
+                let ppd = ((self.x_img_at(&*proj, c + 1f64.to_radians())
+                    - self.x_img_at(&*proj, c - 1f64.to_radians()))
+                    * z as f64
+                    / 2.0)
+                    .abs();
+                let step = [1.0f64, 2.0, 5.0, 10.0, 15.0, 30.0, 45.0, 90.0]
+                    .into_iter()
+                    .find(|s| s * ppd >= 6.0)
+                    .unwrap_or(90.0);
+
+                let a_lo = self
+                    .alph_at_img_x(&*proj, ((b.x - cx) / z) as f64, c)
+                    .min(c - std::f64::consts::PI);
+                let a_hi = self
+                    .alph_at_img_x(&*proj, ((b.x + b.width - cx) / z) as f64, c)
+                    .max(c + std::f64::consts::PI);
+                // the rectilinear projection folds directions behind the
+                // camera onto the same pixels (tan has 180 deg period);
+                // never draw beyond +-88 deg of the center. Cylindrical is
+                // linear in azimuth and may legitimately span > 180 deg.
+                let fold = match self.ptype {
+                    ProjectionType::Rectilinear => 1.535,
+                    ProjectionType::Cylindrical => std::f64::consts::PI,
+                };
+                // additionally clamp to the lens FOV so distortion-folded
+                // out-of-view directions do not get ticks/labels
+                let fold = if self.max_view_angle > 0.0 {
+                    fold.min(self.max_view_angle)
+                } else {
+                    fold
+                };
+                let a_lo = a_lo.max(c - fold);
+                let a_hi = a_hi.min(c + fold);
+
+                // baseline
+                let line = Path::new(|p| {
+                    p.move_to(Point::new(b.x, y0 + 0.5));
+                    p.line_to(Point::new(b.x + b.width, y0 + 0.5));
+                });
+                frame.stroke(
+                    &line,
+                    Stroke {
+                        width: 1.0,
+                        style: GeoStyle::Solid(on),
+                        ..Default::default()
+                    },
+                );
+
+                // ticks (rise from the baseline, stay below the labels);
+                // `a` is radians, `step` degrees -> convert once
+                let step_rad = step.to_radians();
+                let mut a = (a_lo / step_rad).floor() * step_rad;
+                while a <= a_hi {
+                    let x = cx + self.x_img_at(&*proj, a) as f32 * z;
+                    let rem = a.to_degrees().rem_euclid(45.0);
+                    let major = rem.min(45.0 - rem) < step / 2.0;
+                    stroke_tick(&mut frame, x, y0, if major { 12.0 } else { 6.0 }, 1.0, on);
+                    a += step_rad;
+                }
+
+                // direction labels on the top row; skip directions outside
+                // the +-88 deg window (they would fold onto the same pixel)
+                for (deg, name) in DIRS {
+                    let alph = deg.to_radians();
+                    let rel = (alph - c + std::f64::consts::PI).rem_euclid(std::f64::consts::TAU)
+                        - std::f64::consts::PI;
+                    if rel.abs() > fold {
+                        continue;
+                    }
+                    let x = cx + self.x_img_at(&*proj, alph) as f32 * z;
+                    if !x.is_finite() || x < b.x - 20.0 || x > b.x + b.width + 20.0 {
+                        continue;
+                    }
+                    let color = if deg == 0.0 { red } else { on };
+                    texts.push(Txt {
+                        text: name.to_string(),
+                        x,
+                        y: label_y,
+                        centered: true,
+                        color,
+                    });
+                }
+
+                // center marker: triangle + hairline (tick area only)
+                let tri = Path::new(|p| {
+                    p.move_to(Point::new(cx - 6.0, tri_y));
+                    p.line_to(Point::new(cx + 6.0, tri_y));
+                    p.line_to(Point::new(cx, tri_y + 8.0));
+                    p.close();
+                });
+                frame.fill(&tri, red);
+                let hair = Path::new(|p| {
+                    p.move_to(Point::new(cx.round(), tri_y + 8.0));
+                    p.line_to(Point::new(cx.round(), y0));
+                });
+                frame.stroke(
+                    &hair,
+                    Stroke {
+                        width: 1.0,
+                        style: GeoStyle::Solid(red),
+                        ..Default::default()
+                    },
+                );
+
+                let deg = self.center_deg.rem_euclid(360.0);
+                texts.push(Txt {
+                    text: format!("{deg:05.1}°"),
+                    x: cx + 10.0,
+                    y: tri_y - 3.0,
+                    centered: false,
+                    color: red,
+                });
+            }
+            CompassStyle::Ruler => {
+                let bx = b.x;
+                let f = |alph_deg: f64| {
+                    bx + (alph_deg.rem_euclid(360.0) / 360.0) as f32 * b.width
+                };
+                let center = self.center_deg.rem_euclid(360.0);
+                let mx = f(center);
+
+                // FOV band (between label row and baseline)
+                let half = (self.fov_deg / 2.0 / 360.0) as f32 * b.width;
+                let x0 = (mx - half).max(bx);
+                let x1 = (mx + half).min(bx + b.width);
+                if x1 > x0 {
+                    let band = Path::new(|p| {
+                        p.rectangle(
+                            Point::new(x0, tri_y),
+                            Size::new(x1 - x0, y0 - tri_y),
+                        );
+                    });
+                    frame.fill(&band, Color::from_rgba(0.4, 0.65, 1.0, 0.20));
+                }
+
+                // baseline + ticks every 5 deg
+                let line = Path::new(|p| {
+                    p.move_to(Point::new(bx, y0 + 0.5));
+                    p.line_to(Point::new(bx + b.width, y0 + 0.5));
+                });
+                frame.stroke(
+                    &line,
+                    Stroke {
+                        width: 1.0,
+                        style: GeoStyle::Solid(on),
+                        ..Default::default()
+                    },
+                );
+                for deg in (0..360).step_by(5) {
+                    let major = deg % 45 == 0;
+                    stroke_tick(
+                        &mut frame,
+                        f(deg as f64),
+                        y0,
+                        if major { 12.0 } else { 6.0 },
+                        1.0,
+                        on,
+                    );
+                }
+                for (deg, name) in DIRS {
+                    let color = if deg == 0.0 { red } else { on };
+                    texts.push(Txt {
+                        text: name.to_string(),
+                        x: f(deg),
+                        y: label_y,
+                        centered: true,
+                        color,
+                    });
+                }
+
+                // marker
+                let tri = Path::new(|p| {
+                    p.move_to(Point::new(mx - 6.0, tri_y));
+                    p.line_to(Point::new(mx + 6.0, tri_y));
+                    p.line_to(Point::new(mx, tri_y + 8.0));
+                    p.close();
+                });
+                frame.fill(&tri, red);
+                texts.push(Txt {
+                    text: format!("{center:05.1}°"),
+                    x: mx + 10.0,
+                    y: tri_y - 3.0,
+                    centered: false,
+                    color: red,
+                });
+            }
+        }
+
+        renderer.draw_geometry(frame.into_geometry());
+
+        // text (kept alive in state until next frame; positions rounded
+        // so glyphs land on pixel boundaries)
+        let font = renderer.default_font();
+        let state = tree.state.downcast_ref::<CompassState>();
+        {
+            let mut paras = state.paragraphs.borrow_mut();
+            paras.clear();
+            for t in texts.iter() {
+                paras.push(Plain::<<R as adv_text::Renderer>::Paragraph>::new(adv_text::Text {
+                    content: t.text.clone(),
+                    bounds: Size::new(120.0, 20.0),
+                    size: Pixels(13.0),
+                    line_height: LineHeight::default(),
+                    font,
+                    align_x: alignment::Horizontal::Left.into(),
+                    align_y: alignment::Vertical::Top.into(),
+                    shaping: adv_text::Shaping::Basic,
+                    wrapping: adv_text::Wrapping::None,
+                    ellipsize: adv_text::Ellipsize::None,
+                }));
+            }
+        }
+        let paras = state.paragraphs.borrow();
+        for (gi, t) in texts.iter().enumerate() {
+            let para = &paras[gi];
+            let w = para.min_bounds().width;
+            let x = if t.centered { t.x - w / 2.0 } else { t.x };
+            renderer.fill_paragraph(
+                para.raw(),
+                Point::new(x.round(), t.y.round()),
+                t.color,
+                b,
+            );
+        }
+    }
+
+    fn update(
+        &mut self,
+        tree: &mut Tree,
+        event: &Event,
+        layout: Layout<'_>,
+        cursor: Cursor,
+        _renderer: &R,
+        _clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, M>,
+        _viewport: &Rectangle,
+    ) {
+        let state = tree.state.downcast_mut::<CompassState>();
+        let b = layout.bounds();
+        let proj = projection_from_type(self.ptype);
+
+        match event {
+            Event::Mouse(mouse::Event::ButtonPressed(Button::Left)) => {
+                let Some(p) = cursor.position_over(b) else { return };
+                state.drag = Some((p.x, self.center_deg));
+                if self.style == CompassStyle::Ruler {
+                    let alph = ((p.x - b.x) / b.width * 360.0) as f64;
+                    shell.publish((self.on_change)(alph));
+                }
+            }
+            Event::Mouse(mouse::Event::ButtonReleased(Button::Left)) => {
+                state.drag = None;
+            }
+            Event::Mouse(mouse::Event::CursorMoved { .. }) => {
+                let Some((x0, c0)) = state.drag else { return };
+                let Some(p) = cursor.position() else { return };
+                match self.style {
+                    CompassStyle::Aligned => {
+                        let cx = self.center_x(b);
+                        let z = self.zoom;
+                        let a0 =
+                            self.alph_at_img_x(&*proj, ((x0 - cx) / z) as f64, c0.to_radians());
+                        let a1 =
+                            self.alph_at_img_x(&*proj, ((p.x - cx) / z) as f64, c0.to_radians());
+                        let new_c = (c0.to_radians() - (a1 - a0)).to_degrees();
+                        shell.publish((self.on_change)(new_c));
+                    }
+                    CompassStyle::Ruler => {
+                        let alph = ((p.x - b.x) / b.width * 360.0) as f64;
+                        shell.publish((self.on_change)(alph));
+                    }
+                    CompassStyle::Off => {}
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn mouse_interaction(
+        &self,
+        _tree: &Tree,
+        layout: Layout<'_>,
+        cursor: Cursor,
+        _viewport: &Rectangle,
+        _renderer: &R,
+    ) -> Interaction {
+        if cursor.position_over(layout.bounds()).is_some() {
+            Interaction::Grab
+        } else {
+            Interaction::None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn roundtrip(ptype: ProjectionType, k0: f64, k1: f64, x0: f64) {
+        let proj = projection_from_type(ptype);
+        let mut parms = ViewParams::new();
+        parms.a_center = 0.3;
+        parms.scale = 3000.0;
+        parms.k0 = k0;
+        parms.k1 = k1;
+        parms.x0 = x0;
+        for x in [-2500.0, -800.0, -50.0, 0.0, 120.0, 900.0, 2400.0] {
+            let a = alph_at_img_x(ptype, &*proj, &parms, x, parms.a_center);
+            let (x2, _) = proj.get_coordinates(a, 0.0, &parms);
+            assert!(
+                (x2 - x).abs() < 1e-6,
+                "{ptype:?} x={x}: round-trips to {x2} (alph {a})"
+            );
+        }
+    }
+
+    #[test]
+    fn inverse_rectilinear() {
+        roundtrip(ProjectionType::Rectilinear, 0.0, 0.0, 0.0);
+    }
+    #[test]
+    fn inverse_rectilinear_distorted() {
+        // realistic magnitudes: x0 is in normalized (pre-scale) units
+        roundtrip(ProjectionType::Rectilinear, 0.002, -0.0003, 0.01);
+    }
+    #[test]
+    fn inverse_cylindrical() {
+        roundtrip(ProjectionType::Cylindrical, 0.0, 0.0, 0.0);
+    }
+}
diff --git a/crates/gipfel-app/src/dump.rs b/crates/gipfel-app/src/dump.rs
new file mode 100644
index 0000000..0bcfe56
--- /dev/null
+++ b/crates/gipfel-app/src/dump.rs
@@ -0,0 +1,285 @@
+//! Screen dump: render markers/labels onto the photo and save as PNG/JPEG.
+//! Replaces FLTK's window capture from the original "Screen Dump" menu item.
+
+use image::RgbaImage;
+use std::path::Path;
+
+pub struct DumpMarker {
+    pub x: f64,
+    pub y: f64,
+    pub name: String,
+    pub known: bool,
+    pub hidden: bool,
+}
+
+pub struct DumpTrackPt {
+    pub x: f64,
+    pub y: f64,
+    pub hidden: bool,
+    pub width: f64,
+}
+
+fn px(img: &mut RgbaImage, x: i64, y: i64, c: [u8; 4]) {
+    if x >= 0 && y >= 0 && (x as u32) < img.width() && (y as u32) < img.height() {
+        img.put_pixel(x as u32, y as u32, image::Rgba(c));
+    }
+}
+
+fn line(img: &mut RgbaImage, x0: f64, y0: f64, x1: f64, y1: f64, c: [u8; 4], w: i64) {
+    let dx = x1 - x0;
+    let dy = y1 - y0;
+    let n = (dx.hypot(dy) as i64).max(1);
+    for i in 0..=n {
+        let t = i as f64 / n as f64;
+        let (x, y) = (x0 + dx * t, y0 + dy * t);
+        for oy in -w..=w {
+            for ox in -w..=w {
+                px(img, x.round() as i64 + ox, y.round() as i64 + oy, c);
+            }
+        }
+    }
+}
+
+fn circle(img: &mut RgbaImage, cx: f64, cy: f64, r: f64, c: [u8; 4]) {
+    let n = (2.0 * std::f64::consts::PI * r.max(1.0)) as i64;
+    for i in 0..=n {
+        let a = i as f64 / n as f64 * 2.0 * std::f64::consts::PI;
+        px(img, (cx + r * a.cos()).round() as i64, (cy + r * a.sin()).round() as i64, c);
+        px(img, (cx + (r + 1.0) * a.cos()).round() as i64, (cy + (r + 1.0) * a.sin()).round() as i64, c);
+    }
+}
+
+fn tri(img: &mut RgbaImage, p: [(f64, f64); 3], c: [u8; 4]) {
+    let ymin = p.iter().map(|q| q.y() as i64).min().unwrap();
+    let ymax = p.iter().map(|q| q.y() as i64).max().unwrap();
+    for y in ymin..=ymax {
+        let mut xmin = i64::MAX;
+        let mut xmax = i64::MIN;
+        for i in 0..3 {
+            let a = p[i];
+            let b = p[(i + 1) % 3];
+            if (a.y() as i64) == (b.y() as i64) {
+                continue;
+            }
+            if y >= (a.y() as i64).min(b.y() as i64) && y <= (a.y() as i64).max(b.y() as i64) {
+                let t = (y as f64 - a.y()) / (b.y() - a.y());
+                let x = a.x() + t * (b.x() - a.x());
+                xmin = xmin.min(x.round() as i64);
+                xmax = xmax.max(x.round() as i64);
+            }
+        }
+        for x in xmin..=xmax {
+            px(img, x, y, c);
+        }
+    }
+}
+
+trait XY {
+    fn x(self) -> f64;
+    fn y(self) -> f64;
+}
+impl XY for (f64, f64) {
+    fn x(self) -> f64 {
+        self.0
+    }
+    fn y(self) -> f64 {
+        self.1
+    }
+}
+
+fn load_font(family: &str) -> Option<fontdue::Font> {
+    // Resolve the COSMIC interface font (or system sans-serif fallback) through
+    // the same font discovery cosmic's text engine uses, then hand the bytes to
+    // fontdue for the bitmap dump.
+    static FS: std::sync::OnceLock<std::sync::Mutex<cosmic_text::FontSystem>> =
+        std::sync::OnceLock::new();
+    let mut fs = FS
+        .get_or_init(|| std::sync::Mutex::new(cosmic_text::FontSystem::new()))
+        .lock()
+        .unwrap();
+    let fam = [fontdb::Family::Name(family)];
+    let id = fs
+        .db()
+        .query(&fontdb::Query { families: &fam, ..Default::default() })
+        .or_else(|| fs.db().query(&fontdb::Query::default()))?;
+    let font = fs.get_font(id, fontdb::Weight::NORMAL)?;
+    fontdue::Font::from_bytes(
+        font.data().to_vec(),
+        fontdue::FontSettings { scale: 64.0, ..Default::default() },
+    )
+    .ok()
+}
+
+struct GlyphBlit {
+    x: f32,
+    y: f32,
+    width: usize,
+    #[allow(dead_code)]
+    height: usize,
+    pixels: Vec<u8>,
+}
+
+fn layout_text(font: &fontdue::Font, text: &str, size: f32) -> Vec<GlyphBlit> {
+    use fontdue::layout::{CoordinateSystem, Layout as FontLayout, TextStyle};
+    let mut l = FontLayout::new(CoordinateSystem::PositiveYDown);
+    l.append(&[font], &TextStyle::new(text, size, 0));
+    l.glyphs()
+        .iter()
+        .map(|g| {
+            let (m, pixels) = font.rasterize_config(g.key);
+            GlyphBlit { x: g.x, y: g.y, width: m.width, height: m.height, pixels }
+        })
+        .collect()
+}
+
+fn draw_text(img: &mut RgbaImage, font: &fontdue::Font, x: f64, y: f64, text: &str, c: [u8; 4], size: f32) {
+    for glyph in layout_text(font, text, size) {
+        let gx0 = (x + glyph.x as f64).round() as i64;
+        let gy0 = (y + glyph.y as f64).round() as i64;
+        for (i, &alpha) in glyph.pixels.iter().enumerate() {
+            if alpha == 0 {
+                continue;
+            }
+            let gx = gx0 + (i % glyph.width) as i64;
+            let gy = gy0 + (i / glyph.width) as i64;
+            if gx < 0 || gy < 0 || gx >= img.width() as i64 || gy >= img.height() as i64 {
+                continue;
+            }
+            let a = alpha as u32;
+            let old = img.get_pixel(gx as u32, gy as u32).0;
+            let blend = |o: u8, n: u8| ((o as u32 * (255 - a) + n as u32 * a) / 255) as u8;
+            px(img, gx, gy, [blend(old[0], c[0]), blend(old[1], c[1]), blend(old[2], c[2]), 255]);
+        }
+    }
+}
+
+fn text_width(font: &fontdue::Font, text: &str, size: f32) -> f64 {
+    layout_text(font, text, size)
+        .iter()
+        .map(|g| (g.x + g.width as f32) as f64)
+        .fold(0.0, f64::max)
+}
+
+/// Compose the dump: photo + crosses/leaders/labels + track.
+///
+/// `font_size` is the on-screen label font size in screen pixels, `scale`
+/// converts screen pixels to image pixels (1 / zoom): the overlay geometry
+/// is specified in screen pixels (as seen on the display) but the dump is
+/// rendered at the image's native resolution, so every size must be scaled
+/// accordingly. Label placement runs the exact same collision-avoiding
+/// layout as the on-screen viewport (in screen space, then mapped back to
+/// image space), so the dump shows the labels at the same positions.
+pub fn render(
+    img: &RgbaImage,
+    markers: &[DumpMarker],
+    track: &[DumpTrackPt],
+    out: &Path,
+    font_size: f32,
+    scale: f64,
+    font_family: &str,
+) -> Result<(), String> {
+    let mut canvas = img.clone();
+    let (w, h) = (img.width() as f64, img.height() as f64);
+    let (cx, cy) = (w / 2.0, h / 2.0);
+    let s = scale.max(0.1);
+    let font_img = f64::from(font_size) * s;
+    let font = load_font(font_family);
+
+    // track
+    for win in track.windows(2) {
+        let (a, b) = (&win[0], &win[1]);
+        let c = if a.hidden { [51, 102, 255, 255] } else { [255, 51, 51, 255] };
+        line(&mut canvas, cx + a.x, cy + a.y, cx + b.x, cy + b.y, c, (a.width as i64).max(1));
+    }
+
+    // label layout: the exact same collision-avoiding code as the on-screen
+    // viewport (see viewport::layout_label_y). It runs in screen space
+    // (marker positions / scale, screen font size); the resulting offsets
+    // are mapped back to image space with s. Needed for the leader lines
+    // and the label drawing below.
+    let line_h = f64::from(font_size) * 1.3 + 2.0;
+    let in_img: Vec<bool> = markers
+        .iter()
+        .map(|m| m.x.abs() * 2.0 <= w && m.y.abs() * 2.0 <= h)
+        .collect();
+    let layout: Option<Vec<(f32, f32)>> = font.as_ref().map(|font| {
+        let sx: Vec<f32> = markers.iter().map(|m| (m.x / s) as f32).collect();
+        let sy: Vec<f32> = markers.iter().map(|m| (m.y / s) as f32).collect();
+        let widths: Vec<f32> = markers
+            .iter()
+            .map(|m| text_width(font, &m.name, font_size) as f32)
+            .collect();
+        crate::viewport::layout_label_y(&sx, &sy, &widths, &in_img, line_h as f32)
+    });
+
+    let yellow = [255, 230, 51, 255];
+    // ~1 screen pixel stroke at image resolution
+    let lw = ((s - 1.0) / 2.0).round().max(0.0) as i64;
+    // like the screen: known-hill flags in red
+    let flag_color = [255, 64, 64, 255];
+    for (i, m) in markers.iter().enumerate() {
+        let (x, y) = (cx + m.x, cy + m.y);
+        if x < -10.0 || y < -10.0 || x > w + 10.0 || y > h + 10.0 || !in_img[i] {
+            continue;
+        }
+        // yellow cross + leader line up to the label (screen section 3)
+        let d = 4.0 * s;
+        line(&mut canvas, x - d, y, x + d, y, yellow, lw);
+        if let Some(lay) = &layout {
+            let (lx, ly) = lay[i];
+            let label_line = y + (f64::from(ly) - line_h) * s;
+            line(&mut canvas, x, y, x, label_line, yellow, lw);
+            line(&mut canvas, x, label_line, x + f64::from(lx) * s, label_line, yellow, lw);
+        }
+    }
+    // known-hill flags (pole + pennant + circle), on top of all leaders
+    for (i, m) in markers.iter().enumerate() {
+        if !m.known || !in_img[i] {
+            continue;
+        }
+        let (x, y) = (cx + m.x, cy + m.y);
+        if x < -10.0 || y < -10.0 || x > w + 10.0 || y > h + 10.0 {
+            continue;
+        }
+        let pole = 16.0 * s;
+        line(&mut canvas, x, y, x, y - pole, flag_color, (s.round() as i64).max(1));
+        tri(
+            &mut canvas,
+            [(x, y - pole), (x + 10.0 * s, y - pole * 0.8), (x, y - pole * 0.625)],
+            flag_color,
+        );
+        circle(&mut canvas, x, y, 3.0 * s, flag_color);
+    }
+
+    if let (Some(font), Some(layout)) = (&font, &layout) {
+        for (i, m) in markers.iter().enumerate() {
+            if !in_img[i] {
+                continue;
+            }
+            let (_, ly) = layout[i];
+            let (x, y) = (cx + m.x + 2.0 * s, cy + m.y + (f64::from(ly) - line_h) * s);
+            if x < 0.0 || y < 0.0 || x > w || y > h {
+                continue;
+            }
+            let tw = text_width(font, &m.name, font_img as f32);
+            for yy in (y - 2.0 * s) as i64..=(y + font_img + 2.0 * s) as i64 {
+                for xx in (x - 1.0 * s) as i64..=(x + tw + 1.0 * s) as i64 {
+                    px(&mut canvas, xx, yy, [0, 0, 0, 160]);
+                }
+            }
+            let c = if m.hidden { [102, 153, 255, 255] } else { [255, 255, 255, 255] };
+            draw_text(&mut canvas, font, x, y, &m.name, c, font_img as f32);
+        }
+    }
+
+    if out
+        .extension()
+        .is_some_and(|e| e.eq_ignore_ascii_case("jpg") || e.eq_ignore_ascii_case("jpeg"))
+    {
+        let rgb = image::DynamicImage::ImageRgba8(canvas).to_rgb8();
+        rgb.save(out.with_extension("jpg")).map_err(|e| e.to_string())?;
+    } else {
+        canvas.save(out.with_extension("png")).map_err(|e| e.to_string())?;
+    }
+    Ok(())
+}
diff --git a/crates/gipfel-app/src/main.rs b/crates/gipfel-app/src/main.rs
new file mode 100644
index 0000000..4cf0c63
--- /dev/null
+++ b/crates/gipfel-app/src/main.rs
@@ -0,0 +1,1805 @@
+//! gipfel for the COSMIC desktop: annotate mountain panoramas.
+//!
+//! M2/M3: full app skeleton (menus, dialogs, settings sidebar) plus the
+//! interactive viewport (marker placement, refit, context menu, track).
+
+mod compass;
+mod dump;
+mod viewport;
+
+use std::marker::PhantomData;
+use std::path::{Path, PathBuf};
+use std::rc::Rc;
+
+use cosmic::app::{Core, Task};
+use cosmic::iced::keyboard::{self, Key};
+use cosmic::iced::window::Event as WinEvent;
+use cosmic::iced::{event, Color, Event, Length, Subscription, Vector};
+use cosmic::widget::{self, menu, menu::action::MenuAction};
+use cosmic::{Application, ApplicationExt, Element, Theme};
+
+use gipfel_core::hill::{self, Hill, FLAG_DUPLIC, FLAG_HIDDEN, FLAG_TRACK_POINT, FLAG_VISIBLE};
+use gipfel_core::metadata::ImageMetaData;
+use gipfel_core::panorama::Panorama;
+use gipfel_core::projection::ProjectionType;
+use gipfel_core::stitch;
+use gipfel_core::track;
+
+use compass::{Compass, CompassStyle, STRIP_H};
+
+use viewport::{Marker, TrackPt, ViewportWidget, VpMsg};
+
+/// actions of the right-click popover menu on the viewport.
+/// The click position / hit index are baked into the action at menu-build
+/// time (like cosmic-files bakes its entity), so the handler never depends
+/// on state that may have changed while the menu was open.
+#[derive(Clone, Copy, PartialEq)]
+pub enum CtxAction {
+    /// image-space position of the right-click
+    FindPeak(f64, f64),
+    /// hill index of the clicked marker
+    ToggleHidden(usize),
+}
+
+impl Eq for CtxAction {}
+
+impl MenuAction for CtxAction {
+    type Message = Message;
+
+    fn message(&self) -> Message {
+        match self {
+            CtxAction::FindPeak(x, y) => Message::ContextFindPeak(*x, *y),
+            CtxAction::ToggleHidden(i) => Message::ContextToggleHidden(*i),
+        }
+    }
+}
+
+pub struct Flags {
+    pub data: Option<PathBuf>,
+    pub image: Option<PathBuf>,
+}
+
+pub struct Gipfel {
+    core: Core,
+    pan: Panorama,
+    project: Option<Project>,
+    /// hill indices of the known (flagged) markers
+    known: Vec<usize>,
+    /// hill indices of the GPS track points, in file order
+    track: Vec<usize>,
+    // viewport state
+    zoom: f32,
+    fit: bool,
+    panv: Vector,
+    hover: Option<usize>,
+    ctrl: bool,
+    version: u64,
+    win_w: f64,
+    win_h: f64,
+    vp_w: f64,
+    vp_h: f64,
+    // sidebar state
+    lat_in: String,
+    lon_in: String,
+    height_in: String,
+    k0_in: String,
+    k1_in: String,
+    x0_in: String,
+    profile_in: String,
+    profiles: Vec<String>,
+    profile_overwrite: bool,
+    track_width: f64,
+    show_hidden: bool,
+    fit_distortion: bool,
+    label_font: f32,
+    compass_style: CompassStyle,
+    status: String,
+    // overlays
+    picker: Option<Picker>,
+    context: Option<ContextState>,
+    /// peak info shown in the status bar while the mouse hovers a marker
+    hover_info: Option<String>,
+    about: bool,
+}
+
+struct Project {
+    path: PathBuf,
+    handle: cosmic::widget::image::Handle,
+    w: u32,
+    h: u32,
+    md: ImageMetaData,
+}
+
+struct Picker {
+    title: String,
+    query: String,
+    mode: PickerMode,
+}
+
+#[derive(Clone, Copy)]
+enum PickerMode {
+    Viewpoint,
+    FindPeak { img_x: f64, img_y: f64 },
+}
+
+struct ContextState {
+    img_x: f64,
+    img_y: f64,
+    hit: Option<usize>,
+}
+
+#[derive(Debug, Clone)]
+pub enum Message {
+    Vp(VpMsg),
+    Event(Event),
+    WinResized(f64, f64),
+    FileDropped(Vec<PathBuf>),
+
+    OpenImage,
+    OpenPath(Option<PathBuf>),
+    ImageLoaded(Box<Result<LoadedImage, String>>),
+    SaveImage,
+    SavePath(Option<PathBuf>),
+    ImageSaved(Option<PathBuf>),
+    DumpImage,
+    ImageDumped(Box<Result<PathBuf, String>>),
+    StitchTiff,
+    StitchDone(Box<Result<PathBuf, String>>),
+    LoadTrack,
+    TrackLoaded(Box<Result<Vec<Hill>, String>>),
+
+    ChooseViewpoint,
+    PickerQuery(String),
+    PickerPick(usize),
+    PickerClose,
+    ContextFindPeak(f64, f64),
+    ContextToggleHidden(usize),
+    Surface(cosmic::surface::Action<Message>),
+    Redraw,
+
+    Center(f64),
+    Pitch(f64),
+    Roll(f64),
+    LabelFont(f32),
+    Focal(f64),
+    Visibility(f64),
+    TrackWidth(f64),
+    Lat(String),
+    Lon(String),
+    Height(String),
+    ViewApply,
+    K0(String),
+    K1(String),
+    X0(String),
+    DistortionApply,
+    ProfileName(String),
+    ProfileSave,
+    ProfileLoad,
+    ProfileSelect(usize),
+    Projection(ProjectionType),
+    ToggleShowHidden,
+    FitDistortion(bool),
+    ToggleNav,
+    CompassStyle(CompassStyle),
+
+    Fit,
+    ZoomIn,
+    ZoomOut,
+    About(bool),
+    Quit,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+enum Action {
+    Open,
+    Save,
+    Dump,
+    Stitch,
+    LoadTrack,
+    Quit,
+    ChooseViewpoint,
+    ShowHidden,
+    Fit,
+    ZoomIn,
+    ZoomOut,
+    ProjNormal,
+    ProjPanoramic,
+    CompassAligned,
+    CompassRuler,
+    CompassOff,
+    About,
+}
+
+impl MenuAction for Action {
+    type Message = Message;
+    fn message(&self) -> Message {
+        match self {
+            Action::Open => Message::OpenImage,
+            Action::Save => Message::SaveImage,
+            Action::Dump => Message::DumpImage,
+            Action::Stitch => Message::StitchTiff,
+            Action::LoadTrack => Message::LoadTrack,
+            Action::Quit => Message::Quit,
+            Action::ChooseViewpoint => Message::ChooseViewpoint,
+            Action::ShowHidden => Message::ToggleShowHidden,
+            Action::Fit => Message::Fit,
+            Action::ZoomIn => Message::ZoomIn,
+            Action::ZoomOut => Message::ZoomOut,
+            Action::ProjNormal => Message::Projection(ProjectionType::Rectilinear),
+            Action::ProjPanoramic => Message::Projection(ProjectionType::Cylindrical),
+            Action::CompassAligned => Message::CompassStyle(CompassStyle::Aligned),
+            Action::CompassRuler => Message::CompassStyle(CompassStyle::Ruler),
+            Action::CompassOff => Message::CompassStyle(CompassStyle::Off),
+            Action::About => Message::About(true),
+        }
+    }
+}
+
+impl From<VpMsg> for Message {
+    fn from(m: VpMsg) -> Self {
+        Message::Vp(m)
+    }
+}
+
+#[derive(Clone)]
+pub struct LoadedImage {
+    path: PathBuf,
+    w: u32,
+    h: u32,
+    handle: cosmic::widget::image::Handle,
+    md: ImageMetaData,
+}
+
+impl std::fmt::Debug for LoadedImage {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "LoadedImage({})", self.path.display())
+    }
+}
+
+/// Load a GPS track from a `.gpx` (GPS Exchange) or `.csv`/`.dat` (gipfel
+/// hill-CSV) file, returning hills flagged as track points.
+fn load_track_file(path: &Path) -> Result<Vec<Hill>, String> {
+    if path.extension().is_some_and(|e| e.eq_ignore_ascii_case("gpx")) {
+        track::load_gpx(&path.to_string_lossy(), 2000)
+    } else {
+        let mut hs = hill::load(&path.to_string_lossy()).map_err(|e| e.to_string())?;
+        for h in hs.iter_mut() {
+            h.flags |= FLAG_TRACK_POINT;
+        }
+        Ok(hs)
+    }
+}
+
+fn data_candidates(flag: Option<&Path>) -> Vec<PathBuf> {
+    let mut v = Vec::new();
+    if let Some(p) = flag {
+        v.push(p.to_path_buf());
+    }
+    if let Ok(e) = std::env::var("GIPFEL_DATA") {
+        v.push(PathBuf::from(e));
+    }
+    v.push(PathBuf::from("gipfel.dat"));
+    if let Some(home) = std::env::var_os("HOME") {
+        v.push(PathBuf::from(home).join(".local/share/gipfel/gipfel.dat"));
+    }
+    v.push(PathBuf::from("/usr/local/share/gipfel/gipfel.dat"));
+    v.push(PathBuf::from("/usr/share/gipfel/gipfel.dat"));
+    v
+}
+
+/// Inverse projection for the vertical axis: the elevation whose projected
+/// pixel row (image-centered coords, center column) is `y_img`. Shares the
+/// damped Newton iteration with the compass strip (`compass::newton_inverse`).
+fn elev_at_img_y(pan: &Panorama, y_img: f64) -> f64 {
+    let c = pan.parms.a_center;
+    let p = pan.parms.a_pitch;
+    let seed = p - (y_img / pan.parms.scale).atan();
+    compass::newton_inverse(
+        y_img,
+        |e| pan.project_point(c, e).map(|v| v.1),
+        seed,
+        p - 1.535,
+        p + 1.535,
+    )
+}
+
+impl Gipfel {
+    fn bump(&mut self) {
+        // keep the visibility limit in sync with the lens' actual field of
+        // view: the angle at which the (distorted) projection reaches the
+        // image edge. Directions beyond it cannot be inside the photo, even
+        // if the distortion model folds their projection back into it.
+        let limit = self.view_angle_limit();
+        if (limit - self.pan.max_view_angle).abs() > 1e-9 {
+            self.pan.max_view_angle = limit;
+            // keep the user-placed marker positions (observations) intact
+            self.pan.update_visible_mountains(Some(&self.known));
+        }
+        self.version += 1;
+    }
+
+    /// Reload the stored profile names from the prefs file.
+    fn refresh_profiles(&mut self) {
+        self.profiles = gipfel_core::profile::list().into_iter().map(|(n, _)| n).collect();
+    }
+
+    /// Load a stored profile and apply its distortion parameters.
+    fn apply_profile(&mut self, name: &str) {
+        match gipfel_core::profile::load(name) {
+            Ok(p) => {
+                self.pan.set_distortion_params(p.k0, p.k1, p.x0);
+                self.sync_inputs();
+                self.bump();
+                self.status = format!("loaded profile '{name}'");
+            }
+            Err(e) => self.status = format!("profile '{name}': {e}"),
+        }
+    }
+
+    /// half-angle (radians) the projection maps the image's right edge to,
+    /// i.e. the horizontal FOV of the lens including fitted distortion.
+    /// 0 = no image loaded / not computable.
+    fn view_angle_limit(&self) -> f64 {
+        let Some(p) = &self.project else {
+            return 0.0;
+        };
+        let proj = gipfel_core::projection::projection_from_type(self.pan.projection_type);
+        let c = self.pan.parms.a_center;
+        let a_edge = compass::alph_at_img_x(
+            self.pan.projection_type,
+            &*proj,
+            &self.pan.parms,
+            p.w as f64 / 2.0,
+            c,
+        );
+        (a_edge - c).abs()
+    }
+
+    fn img_max(&self) -> f64 {
+        self.project
+            .as_ref()
+            .map(|p| p.w.max(p.h) as f64)
+            .unwrap_or(1000.0)
+    }
+
+    fn focal_35mm(&self) -> f64 {
+        self.pan.get_scale() * 35.0 / self.img_max()
+    }
+
+    fn set_focal_35mm(&mut self, f: f64) {
+        self.pan.set_scale(f * self.img_max() / 35.0);
+    }
+
+    fn sync_inputs(&mut self) {
+        self.lat_in = format!("{:.5}", self.pan.get_view_lat());
+        self.lon_in = format!("{:.5}", self.pan.get_view_long());
+        self.height_in = format!("{:.0}", self.pan.get_view_height());
+        self.k0_in = format!("{:.5}", self.pan.parms.k0);
+        self.k1_in = format!("{:.5}", self.pan.parms.k1);
+        self.x0_in = format!("{:.1}", self.pan.parms.x0);
+    }
+
+    fn fit_zoom(&self) -> f32 {
+        let p = match &self.project {
+            Some(p) => p,
+            None => return 1.0,
+        };
+        if self.vp_w < 10.0 || self.vp_h < 10.0 {
+            return 1.0;
+        }
+        (self.vp_w / p.w as f64).min(self.vp_h / p.h as f64) as f32
+    }
+
+    fn markers(&self) -> Rc<Vec<Marker>> {
+        let mut v = Vec::new();
+        for &i in &self.pan.visible {
+            let h = &self.pan.hills[i];
+            if h.is_track_point() || h.flags & FLAG_DUPLIC != 0 {
+                continue;
+            }
+            let hidden = h.flags & FLAG_HIDDEN != 0;
+            if hidden && !self.show_hidden {
+                continue;
+            }
+            v.push(Marker {
+                x: h.x,
+                y: h.y,
+                name: h.name.as_str().into(),
+                idx: i,
+                known: self.known.contains(&i),
+                hidden,
+            });
+        }
+        Rc::new(v)
+    }
+
+    fn track_pts(&self) -> Rc<Vec<TrackPt>> {
+        let v = self
+            .track
+            .iter()
+            .filter(|&&i| self.pan.hills[i].flags & FLAG_VISIBLE != 0)
+            .map(|&i| {
+                let h = &self.pan.hills[i];
+                // C: max(scale * track_width / (dist_m * 10), 1) - distance in
+                // meters. (Was wrongly divided by km here, inflating widths
+                // 1000x and breaking stroke triangulation.) Clamped high so
+                // near-camera points can't produce absurd strokes.
+                let dist_m = self.pan.get_real_distance(i).max(1.0);
+                let width =
+                    (self.pan.get_scale() * self.track_width / (dist_m * 10.0)).clamp(1.0, 1000.0);
+                TrackPt {
+                    x: h.x,
+                    y: h.y,
+                    hidden: h.flags & FLAG_HIDDEN != 0,
+                    width,
+                }
+            })
+            .collect();
+        Rc::new(v)
+    }
+
+    /// recompute viewport metrics from window size, nav and compass state
+    fn remeasure(&mut self) {
+        let nav = if self.core().nav_bar_active() { 340.0 } else { 0.0 };
+        let strip = if self.project.is_some() && self.compass_style != CompassStyle::Off {
+            STRIP_H as f64
+        } else {
+            0.0
+        };
+        self.vp_w = (self.win_w - nav).max(100.0);
+        self.vp_h = (self.win_h - 100.0 - strip).max(100.0);
+        if self.fit {
+            self.zoom = self.fit_zoom();
+        }
+    }
+
+    fn refit(&mut self) {
+        if self.known.is_empty() {
+            return;
+        }
+        if let Err(e) = self.pan.comp_params(&self.known, self.fit_distortion) {
+            self.status = format!("refit failed: {e}");
+        }
+        self.sync_inputs();
+        self.bump();
+    }
+
+    fn md_from_state(&self) -> ImageMetaData {
+        let mut md = ImageMetaData::new();
+        if let Some(p) = &self.project {
+            md.manufacturer = p.md.manufacturer.clone();
+            md.model = p.md.model.clone();
+        }
+        md.longitude = self.pan.get_view_long();
+        md.latitude = self.pan.get_view_lat();
+        md.height = self.pan.get_view_height();
+        md.direction = self.pan.get_center_angle();
+        md.pitch = self.pan.get_pitch_angle();
+        md.roll = self.pan.get_roll_angle();
+        md.focal_length_35mm = self.focal_35mm();
+        md.projection_type = self.pan.projection_type as i32;
+        md.k0 = self.pan.parms.k0;
+        md.k1 = self.pan.parms.k1;
+        md.x0 = self.pan.parms.x0;
+        md
+    }
+
+    fn open_image(&mut self, path: PathBuf) -> Task<Message> {
+        let task = async move {
+            let img = image::open(&path).map_err(|e| format!("{}: {e}", path.display()))?;
+            let (w, h) = (img.width(), img.height());
+            let rgba = img.to_rgba8();
+            let handle = cosmic::widget::image::Handle::from_rgba(w, h, rgba.into_raw());
+            let mut md = ImageMetaData::new();
+            md.load_image(&path.to_string_lossy());
+            Ok(LoadedImage { path, w, h, handle, md })
+        };
+        cosmic::task::future(async move { Message::ImageLoaded(Box::new(task.await)) })
+    }
+
+    fn picker_entries(&self, p: &Picker) -> Vec<(String, usize)> {
+        let mut idxs: Vec<usize> = match p.mode {
+            PickerMode::Viewpoint => (0..self.pan.hills.len()).collect(),
+            PickerMode::FindPeak { .. } => self.pan.close.clone(),
+        };
+        let q = p.query.to_uppercase();
+        let mut entries: Vec<(String, usize)> = idxs
+            .drain(..)
+            .filter(|&i| {
+                let h = &self.pan.hills[i];
+                h.flags & (FLAG_DUPLIC | FLAG_TRACK_POINT) == 0
+                    && (q.is_empty() || h.name.to_uppercase().contains(&q))
+            })
+            .map(|i| (format!("{} ({} m)", self.pan.hills[i].name, self.pan.hills[i].height as i64), i))
+            .collect();
+        entries.sort_by(|a, b| a.0.cmp(&b.0));
+        entries.truncate(300);
+        entries
+    }
+
+    fn update_vp(&mut self, msg: VpMsg) -> Task<Message> {
+        match msg {
+            VpMsg::ZoomAt { factor, img } => {
+                let new_zoom = (self.zoom * factor).clamp(0.02, 16.0);
+                let z = self.zoom as f64;
+                let nz = new_zoom as f64;
+                self.panv = Vector::new(
+                    self.panv.x + (img.x as f64 * (z - nz)) as f32,
+                    self.panv.y + (img.y as f64 * (z - nz)) as f32,
+                );
+                self.zoom = new_zoom;
+                self.fit = false;
+            }
+            VpMsg::PanBy { delta } => {
+                self.panv = Vector::new(self.panv.x + delta.x, self.panv.y + delta.y);
+                self.fit = false;
+            }
+            VpMsg::PanTo { pan } => {
+                self.panv = pan;
+                self.fit = false;
+            }
+            VpMsg::MoveMarker { idx, img } => {
+                if idx < self.pan.hills.len() {
+                    self.pan.hills[idx].x = img.x as f64;
+                    self.pan.hills[idx].y = img.y as f64;
+                    self.bump();
+                }
+            }
+            VpMsg::DragEnd { had_marker } => {
+                if had_marker {
+                    self.refit();
+                }
+            }
+            VpMsg::ToggleKnown(hit) => {
+                if let Some(i) = hit {
+                    if let Some(pos) = self.known.iter().position(|&k| k == i) {
+                        self.known.remove(pos);
+                    } else {
+                        self.known.push(i);
+                    }
+                    self.refit();
+                }
+            }
+            VpMsg::ContextAt { img, hit } => {
+                self.context = Some(ContextState { img_x: img.x as f64, img_y: img.y as f64, hit });
+            }
+            VpMsg::Hover(h) => {
+                if h != self.hover {
+                    self.hover = h;
+                    self.hover_info = h.map(|i| {
+                        let hm = &self.pan.hills[i];
+                        format!(
+                            "{} ({} m), distance {:.2} km",
+                            hm.name,
+                            hm.height as i64,
+                            self.pan.get_real_distance(i) / 1000.0
+                        )
+                    });
+                }
+            }
+        }
+        Task::none()
+    }
+}
+
+impl Application for Gipfel {
+    type Executor = cosmic::executor::Default;
+    type Flags = Flags;
+    type Message = Message;
+    const APP_ID: &'static str = "org.gipfel.App";
+
+    fn core(&self) -> &Core {
+        &self.core
+    }
+
+    fn core_mut(&mut self) -> &mut Core {
+        &mut self.core
+    }
+
+    fn init(core: Core, flags: Flags) -> (Self, Task<Message>) {
+        let mut pan = Panorama::new();
+        let mut status = String::from("no hill database loaded");
+        for c in data_candidates(flags.data.as_deref()) {
+            if c.is_file() {
+                match pan.load_data(&c.to_string_lossy()) {
+                    Ok(()) => {
+                        status = format!("{} hills loaded", pan.hills.len());
+                        break;
+                    }
+                    Err(e) => status = format!("cannot read {}: {e}", c.display()),
+                }
+            }
+        }
+
+        let mut app = Gipfel {
+            core,
+            pan,
+            project: None,
+            known: Vec::new(),
+            track: Vec::new(),
+            zoom: 1.0,
+            fit: true,
+            panv: Vector::ZERO,
+            hover: None,
+            ctrl: false,
+            version: 0,
+            win_w: 1280.0,
+            win_h: 800.0,
+            vp_w: 0.0,
+            vp_h: 0.0,
+            lat_in: String::new(),
+            lon_in: String::new(),
+            height_in: String::new(),
+            k0_in: String::new(),
+            k1_in: String::new(),
+            x0_in: String::new(),
+            profile_in: String::new(),
+            profiles: gipfel_core::profile::list().into_iter().map(|(n, _)| n).collect(),
+            profile_overwrite: false,
+            track_width: 200.0,
+            show_hidden: false,
+            label_font: viewport::DEFAULT_LABEL_FONT,
+            fit_distortion: false,
+            compass_style: CompassStyle::Aligned,
+            status,
+            picker: None,
+            context: None,
+            hover_info: None,
+            about: false,
+        };
+        app.sync_inputs();
+
+        let task = match flags.image {
+            Some(p) => app.open_image(p),
+            None => Task::none(),
+        };
+        (app, task)
+    }
+
+    fn header_start(&self) -> Vec<Element<'_, Message>> {
+        let mut kb = std::collections::HashMap::new();
+        use cosmic::widget::menu::key_bind::{KeyBind, Modifier};
+        let kb = &mut kb;
+        for (ch, action) in [
+            ("o", Action::Open),
+            ("s", Action::Save),
+            ("d", Action::Dump),
+            ("t", Action::LoadTrack),
+            ("v", Action::ChooseViewpoint),
+            ("f", Action::Fit),
+            ("q", Action::Quit),
+        ] {
+            kb.insert(
+                KeyBind { modifiers: vec![Modifier::Ctrl], key: Key::Character(ch.into()) },
+                action,
+            );
+        }
+
+        let file = menu::Tree::with_children(
+            cosmic::widget::RcElementWrapper::new(menu::root("File").into()),
+            menu::items(
+                kb,
+                vec![
+                    menu::Item::Button("Open Image…", None, Action::Open),
+                    menu::Item::Button("Save Image…", None, Action::Save),
+                    menu::Item::Button("Screen Dump…", None, Action::Dump),
+                    menu::Item::Button("Stitch Cylindrical TIFF…", None, Action::Stitch),
+                    menu::Item::Divider,
+                    menu::Item::Button("Load GPX Track…", None, Action::LoadTrack),
+                    menu::Item::Divider,
+                    menu::Item::Button("Quit", None, Action::Quit),
+                ],
+            ),
+        );
+        let view = menu::Tree::with_children(
+            cosmic::widget::RcElementWrapper::new(menu::root("View").into()),
+            menu::items(
+                kb,
+                vec![
+                    menu::Item::Button("Choose Viewpoint…", None, Action::ChooseViewpoint),
+                    menu::Item::CheckBox(
+                        "Show Hidden",
+                        None,
+                        self.show_hidden,
+                        Action::ShowHidden,
+                    ),
+                    menu::Item::Divider,
+                    menu::Item::Button("Zoom In", None, Action::ZoomIn),
+                    menu::Item::Button("Zoom Out", None, Action::ZoomOut),
+                    menu::Item::Button("Fit", None, Action::Fit),
+                    menu::Item::Divider,
+                    menu::Item::CheckBox(
+                        "Compass strip",
+                        None,
+                        self.compass_style == CompassStyle::Aligned,
+                        Action::CompassAligned,
+                    ),
+                    menu::Item::CheckBox(
+                        "Compass ruler",
+                        None,
+                        self.compass_style == CompassStyle::Ruler,
+                        Action::CompassRuler,
+                    ),
+                    menu::Item::CheckBox(
+                        "Compass off",
+                        None,
+                        self.compass_style == CompassStyle::Off,
+                        Action::CompassOff,
+                    ),
+                ],
+            ),
+        );
+        let projection = menu::Tree::with_children(
+            cosmic::widget::RcElementWrapper::new(menu::root("Projection").into()),
+            menu::items(
+                kb,
+                vec![
+                    menu::Item::CheckBox(
+                        "Normal",
+                        None,
+                        self.pan.projection_type == ProjectionType::Rectilinear,
+                        Action::ProjNormal,
+                    ),
+                    menu::Item::CheckBox(
+                        "Panoramic",
+                        None,
+                        self.pan.projection_type == ProjectionType::Cylindrical,
+                        Action::ProjPanoramic,
+                    ),
+                ],
+            ),
+        );
+        let help = menu::Tree::with_children(
+            cosmic::widget::RcElementWrapper::new(menu::root("Help").into()),
+            menu::items(kb, vec![menu::Item::Button("About gipfel", None, Action::About)]),
+        );
+
+        vec![
+            widget::nav_bar_toggle()
+                .active(self.core().nav_bar_active())
+                .on_toggle(Message::ToggleNav)
+                .into(),
+            menu::bar(vec![file, view, projection, help])
+                .item_height(menu::ItemHeight::Dynamic(40))
+                .item_width(menu::ItemWidth::Uniform(260))
+                .spacing(4.0)
+                .into(),
+        ]
+    }
+
+    fn subscription(&self) -> Subscription<Message> {
+        event::listen_with(|event, _status, _id| match event {
+            Event::Keyboard(keyboard::Event::ModifiersChanged(m)) => {
+                Some(Message::Event(Event::Keyboard(keyboard::Event::ModifiersChanged(m))))
+            }
+            Event::Keyboard(keyboard::Event::KeyPressed { key, modifiers, .. }) => {
+                if modifiers.control() {
+                    if let Key::Character(c) = &key {
+                        match c.as_str() {
+                            "o" | "O" => return Some(Message::OpenImage),
+                            "s" | "S" => return Some(Message::SaveImage),
+                            "d" | "D" => return Some(Message::DumpImage),
+                            "t" | "T" => return Some(Message::LoadTrack),
+                            "v" | "V" => return Some(Message::ChooseViewpoint),
+                            "f" | "F" => return Some(Message::Fit),
+                            "q" | "Q" => return Some(Message::Quit),
+                            _ => {}
+                        }
+                    }
+                }
+                match key {
+                    Key::Named(cosmic::iced::keyboard::key::Named::Escape) => {
+                        Some(Message::PickerClose)
+                    }
+                    _ => None,
+                }
+            }
+            Event::Window(WinEvent::FileDropped(paths)) => Some(Message::FileDropped(paths)),
+            Event::Window(WinEvent::Resized(size)) => {
+                Some(Message::WinResized(size.width as f64, size.height as f64))
+            }
+            _ => None,
+        })
+    }
+
+    fn update(&mut self, message: Message) -> Task<Message> {
+        use cosmic::dialog::file_chooser::FileFilter;
+
+        match message {
+            Message::Vp(m) => return self.update_vp(m),
+            Message::Event(Event::Keyboard(keyboard::Event::ModifiersChanged(m))) => {
+                self.ctrl = m.control();
+            }
+            Message::Event(_) => {}
+            Message::ToggleNav => {
+                self.core_mut().nav_bar_toggle();
+                self.remeasure();
+            }
+            Message::WinResized(w, h) => {
+                self.win_w = w;
+                self.win_h = h;
+                self.remeasure();
+            }
+            Message::FileDropped(paths) => {
+                for p in paths {
+                    let ext = p.extension().and_then(|e| e.to_str()).unwrap_or("");
+                    if matches!(ext.to_ascii_lowercase().as_str(), "jpg" | "jpeg" | "png") {
+                        return self.open_image(p);
+                    } else if ext.eq_ignore_ascii_case("csv") || ext.eq_ignore_ascii_case("dat") {
+                        // treat as track file
+                        let task = async move {
+                            hill::load(&p.to_string_lossy())
+                                .map(|mut hs| {
+                                    for h in hs.iter_mut() {
+                                        h.flags |= FLAG_TRACK_POINT;
+                                    }
+                                    hs
+                                })
+                                .map_err(|e| e.to_string())
+                        };
+                        return cosmic::task::future(async move {
+                            Message::TrackLoaded(Box::new(task.await))
+                        });
+                    }
+                }
+            }
+            Message::OpenImage => {
+                return cosmic::task::future(async move {
+                    let filter =
+                        FileFilter::new("Images").glob("*.jpg").glob("*.jpeg").glob("*.png");
+                    Message::OpenPath(pick_open("Open Image", filter).await)
+                });
+            }
+            Message::OpenPath(Some(p)) => return self.open_image(p),
+            Message::OpenPath(None) => {}
+            Message::ImageLoaded(res) => match *res {
+                Ok(li) => {
+                    let title = li.path.file_name().map(|s| s.to_string_lossy().into_owned()).unwrap_or_default();
+                    self.set_header_title(title);
+                    let (w, h) = (li.w, li.h);
+                    self.project = Some(Project {
+                        path: li.path,
+                        handle: li.handle,
+                        w,
+                        h,
+                        md: li.md.clone(),
+                    });
+                    let md = li.md;
+                    let have = gipfel_core::metadata::apply_image_metadata(&mut self.pan, &md, w, h);
+                    self.known.clear();
+                    self.track.clear();
+                    self.sync_inputs();
+                    self.fit = true;
+                    self.remeasure();
+                    self.zoom = self.fit_zoom();
+                    self.panv = Vector::ZERO;
+                    self.bump();
+                    // prefill the profile name the auto-match used (C
+                    // get_distortion_profile_name) and refresh the store list
+                    let auto_profile = gipfel_core::metadata::distortion_profile_name(&md);
+                    self.profile_in = auto_profile.clone().unwrap_or_default();
+                    self.profile_overwrite = false;
+                    self.refresh_profiles();
+                    self.status = if have {
+                        format!("loaded (gipfel info found)")
+                    } else {
+                        "loaded (no gipfel info: set viewpoint)".into()
+                    };
+                    if md.k0.is_nan() {
+                        if let Some(name) =
+                            auto_profile.filter(|n| self.profiles.iter().any(|p| p == n))
+                        {
+                            self.status = format!("{} - distortion profile '{name}'", self.status);
+                        }
+                    }
+                    // the first frame after the image appears can be drawn
+                    // before the texture is fully uploaded; a late nudge
+                    // guarantees the photo shows without user interaction
+                    return Task::perform(
+                        async { tokio::time::sleep(std::time::Duration::from_millis(150)).await },
+                        |_| cosmic::Action::App(Message::Redraw),
+                    );
+                }
+                Err(e) => self.status = e,
+            },
+            Message::SaveImage => {
+                let Some(p) = &self.project else {
+                    self.status = "no image loaded".into();
+                    return Task::none();
+                };
+                let _ = p;
+                return cosmic::task::future(async move {
+                    let filter = FileFilter::new("JPEG").glob("*.jpg");
+                    Message::SavePath(pick_save("Save Image", filter).await)
+                });
+            }
+            Message::SavePath(out) => {
+                let (Some(out), Some(p)) = (out, &self.project) else { return Task::none() };
+                let md = self.md_from_state();
+                let src = p.path.clone();
+                return cosmic::task::future(async move {
+                    match md.save_image(&src.to_string_lossy(), &out.to_string_lossy()) {
+                        Ok(()) => Message::ImageSaved(Some(out)),
+                        Err(e) => {
+                            let _ = e;
+                            Message::ImageSaved(None)
+                        }
+                    }
+                });
+            }
+            Message::ImageSaved(Some(p)) => {
+                self.status = format!("saved {}", p.display());
+            }
+            Message::ImageSaved(None) => {}
+            Message::DumpImage => {
+                let Some(p) = &self.project else {
+                    self.status = "no image loaded".into();
+                    return Task::none();
+                };
+                let path = p.path.clone();
+                // the dump is at image resolution; screen-pixel overlay sizes
+                // must be divided by the current zoom to look like the screen
+                let zoom = self.zoom.max(0.02) as f64;
+                let markers: Vec<dump::DumpMarker> = self
+                    .markers()
+                    .iter()
+                    .map(|m| dump::DumpMarker {
+                        x: m.x,
+                        y: m.y,
+                        name: m.name.to_string(),
+                        known: m.known,
+                        hidden: m.hidden,
+                    })
+                    .collect();
+                let track: Vec<dump::DumpTrackPt> = self
+                    .track_pts()
+                    .iter()
+                    .map(|t| dump::DumpTrackPt { x: t.x, y: t.y, hidden: t.hidden, width: t.width })
+                    .collect();
+                let font_size = self.label_font;
+                let font_family = cosmic::config::interface_font().family;
+                return cosmic::task::future(async move {
+                    let res: Result<PathBuf, String> = async {
+                        let filter = FileFilter::new("Images").glob("*.png").glob("*.jpg");
+                        let out =
+                            pick_save("Screen Dump", filter).await.ok_or_else(|| "cancelled".to_string())?;
+                        let img = image::open(&path)
+                            .map(|i| i.to_rgba8())
+                            .map_err(|e| format!("{e}"))?;
+                        dump::render(&img, &markers, &track, &out, font_size, 1.0 / zoom, &font_family)?;
+                        Ok(out)
+                    }
+                    .await;
+                    Message::ImageDumped(Box::new(res))
+                });
+            }
+            Message::ImageDumped(res) => {
+                self.status = match *res {
+                    Ok(p) => format!("dumped {}", p.display()),
+                    Err(e) => e,
+                };
+            }
+            Message::StitchTiff => {
+                let Some(p) = &self.project else {
+                    self.status = "no image loaded".into();
+                    return Task::none();
+                };
+                // cylindrical output spanning the lens' actual field of view
+                let edge = self.view_angle_limit(); // half-angle, radians
+                if !(edge > 0.0 && edge < 1.5) {
+                    self.status = "cannot determine lens field of view".into();
+                    return Task::none();
+                }
+                let center = self.pan.get_center_angle();
+                let (from, to) = (center - edge.to_degrees(), center + edge.to_degrees());
+                // output scale = the source's focal scale (pixels per radian
+                // at image center): the cylindrical image is 1:1 in the middle
+                // and slightly downsampled towards the edges (where the
+                // rectilinear source has increasing angular stretch). Using
+                // the source width instead would upsample ~5-10% and blur.
+                let radius = self.pan.get_scale();
+                let w_out = (2.0 * edge * radius).round_ties_even().max(16.0) as u32;
+                // cover the source's vertical extent (may be off-center
+                // with pitch); output rows are symmetric about elevation 0
+                let e_top = elev_at_img_y(&self.pan, -(p.h as f64 / 2.0));
+                let e_bot = elev_at_img_y(&self.pan, p.h as f64 / 2.0);
+                let e_max = e_top.abs().max(e_bot.abs()).min(85f64.to_radians());
+                let h_out = (2.0 * radius * e_max.tan()).round_ties_even().max(16.0) as u32;
+                let path = p.path.clone();
+                let pan = self.pan.params_snapshot();
+                return cosmic::task::future(async move {
+                    let res: Result<PathBuf, String> = async {
+                        let filter = FileFilter::new("TIFF images").glob("*.tif").glob("*.tiff");
+                        let out = pick_save("Stitch Cylindrical TIFF", filter)
+                            .await
+                            .ok_or_else(|| "cancelled".to_string())?;
+                        let out_for_task = out.clone();
+                        tokio::task::spawn_blocking(move || -> Result<(), String> {
+                            let mut src = stitch::StitchSource::load(&path.to_string_lossy())?;
+                            // use the live (possibly adjusted) parameters
+                            src.pan = pan;
+                            let img = stitch::resample(
+                                &[src],
+                                stitch::ScanMode::Bicubic,
+                                w_out,
+                                h_out,
+                                from,
+                                to,
+                            );
+                            stitch::write_tiff(&out_for_task.to_string_lossy(), &img, true)
+                        })
+                        .await
+                        .map_err(|e| e.to_string())??;
+                        Ok(out)
+                    }
+                    .await;
+                    Message::StitchDone(Box::new(res))
+                });
+            }
+            Message::StitchDone(res) => {
+                self.status = match *res {
+                    Ok(p) => format!("stitched {}", p.display()),
+                    Err(e) => e,
+                };
+            }
+            Message::LoadTrack => {
+                return cosmic::task::future(async move {
+                    let res: Result<Vec<Hill>, String> = async {
+                        let filter = FileFilter::new("Track files")
+                            .glob("*.gpx")
+                            .glob("*.csv")
+                            .glob("*.dat");
+                        let path = pick_open("Load GPX Track", filter)
+                            .await
+                            .ok_or_else(|| "cancelled".to_string())?;
+                        let hs = load_track_file(&path).map_err(|e| e.to_string())?;
+                        Ok(hs)
+                    }
+                    .await;
+                    Message::TrackLoaded(Box::new(res))
+                });
+            }
+            Message::TrackLoaded(res) => match *res {
+                Ok(hills) => {
+                    // remap known hills by name across the index shift caused by
+                    // removing the old track
+                    let names: Vec<String> = self.known.iter().map(|&i| self.pan.hills[i].name.clone()).collect();
+                    self.pan.remove_hills(FLAG_TRACK_POINT);
+                    let n = hills.len();
+                    self.pan.add_hills(&hills);
+                    let base = self.pan.hills.len() - n;
+                    self.track = (base..base + n).collect();
+                    self.known = names
+                        .iter()
+                        .filter_map(|n| self.pan.get_pos(n))
+                        .collect();
+                    self.status = format!("track: {n} points");
+                    self.bump();
+                }
+                Err(e) => self.status = e,
+            },
+            Message::ChooseViewpoint => {
+                self.picker = Some(Picker {
+                    title: "Choose Viewpoint".into(),
+                    query: String::new(),
+                    mode: PickerMode::Viewpoint,
+                });
+            }
+            Message::ContextFindPeak(x, y) => {
+                self.context = None;
+                self.picker = Some(Picker {
+                    title: "Find Peak".into(),
+                    query: String::new(),
+                    mode: PickerMode::FindPeak { img_x: x, img_y: y },
+                });
+            }
+            Message::PickerQuery(q) => {
+                if let Some(p) = &mut self.picker {
+                    p.query = q;
+                }
+            }
+            Message::PickerPick(i) => {
+                if let Some(p) = self.picker.take() {
+                    match p.mode {
+                        PickerMode::Viewpoint => {
+                            self.pan.set_viewpoint(Some(i));
+                            self.sync_inputs();
+                            self.bump();
+                            self.status = format!("viewpoint: {}", self.pan.hills[i].name);
+                        }
+                        PickerMode::FindPeak { img_x, img_y } => {
+                            if !self.known.contains(&i) {
+                                self.known.push(i);
+                            }
+                            self.pan.hills[i].flags |= FLAG_VISIBLE;
+                            if !self.pan.visible.contains(&i) {
+                                self.pan.visible.push(i);
+                            }
+                            self.pan.hills[i].x = img_x;
+                            self.pan.hills[i].y = img_y;
+                            self.refit();
+                        }
+                    }
+                }
+            }
+            Message::PickerClose => {
+                self.picker = None;
+                self.about = false;
+                self.context = None;
+            }
+            Message::ContextToggleHidden(i) => {
+                self.context = None;
+                self.pan.hills[i].flags ^= FLAG_HIDDEN;
+                self.bump();
+            }
+            Message::Surface(action) => {
+                return cosmic::task::message(cosmic::Action::Surface(action));
+            }
+            Message::Redraw => {}
+            Message::Center(a) => {
+                self.pan.set_center_angle(a);
+                self.bump();
+            }
+            Message::CompassStyle(s) => {
+                self.compass_style = s;
+                self.remeasure();
+                self.bump();
+            }
+            Message::Pitch(a) => {
+                self.pan.set_pitch_angle(a);
+                self.bump();
+            }
+            Message::Roll(a) => {
+                self.pan.set_roll_angle(a);
+                self.bump();
+            }
+            Message::LabelFont(s) => {
+                self.label_font = s;
+                self.bump();
+            }
+            Message::Focal(f) => {
+                self.set_focal_35mm(f);
+                self.bump();
+            }
+            Message::Visibility(v) => {
+                // the slider shows more visibility to the right; the core
+                // stores a height/distance threshold (higher = fewer hills)
+                self.pan.set_height_dist_ratio(0.11 - v);
+                self.bump();
+            }
+            Message::TrackWidth(w) => self.track_width = w,
+            Message::Lat(s) => self.lat_in = s,
+            Message::Lon(s) => self.lon_in = s,
+            Message::Height(s) => self.height_in = s,
+            Message::ViewApply => {
+                if let Ok(v) = self.lat_in.parse() {
+                    self.pan.set_view_lat(v);
+                }
+                if let Ok(v) = self.lon_in.parse() {
+                    self.pan.set_view_long(v);
+                }
+                if let Ok(v) = self.height_in.parse() {
+                    self.pan.set_view_height(v);
+                }
+                self.bump();
+            }
+            Message::K0(s) => self.k0_in = s,
+            Message::K1(s) => self.k1_in = s,
+            Message::X0(s) => self.x0_in = s,
+            Message::DistortionApply => {
+                let k0 = self.k0_in.parse().unwrap_or(0.0);
+                let k1 = self.k1_in.parse().unwrap_or(0.0);
+                let x0 = self.x0_in.parse().unwrap_or(0.0);
+                self.pan.set_distortion_params(k0, k1, x0);
+                self.bump();
+            }
+            Message::ProfileName(s) => {
+                self.profile_in = s;
+                self.profile_overwrite = false;
+            }
+            Message::ProfileSave => {
+                let name = self.profile_in.trim().to_string();
+                if name.is_empty() {
+                    self.status = "enter a profile name".into();
+                } else {
+                    let p = gipfel_core::profile::Profile {
+                        k0: self.pan.parms.k0,
+                        k1: self.pan.parms.k1,
+                        x0: self.pan.parms.x0,
+                    };
+                    let exists = self.profiles.iter().any(|n| *n == name);
+                    if exists && !self.profile_overwrite {
+                        self.profile_overwrite = true;
+                        self.status =
+                            format!("profile '{name}' exists - press Save again to overwrite");
+                    } else {
+                        match gipfel_core::profile::save(&name, p, true) {
+                            Ok(()) => {
+                                self.status = format!("saved profile '{name}'");
+                                self.profile_overwrite = false;
+                                self.refresh_profiles();
+                            }
+                            Err(e) => self.status = format!("save failed: {e}"),
+                        }
+                    }
+                }
+            }
+            Message::ProfileLoad => {
+                let name = self.profile_in.trim().to_string();
+                if !name.is_empty() {
+                    self.apply_profile(&name);
+                }
+            }
+            Message::ProfileSelect(i) => {
+                if let Some(name) = self.profiles.get(i).cloned() {
+                    self.profile_in = name.clone();
+                    self.apply_profile(&name);
+                }
+            }
+            Message::Projection(t) => {
+                self.pan.set_projection(t);
+                self.bump();
+            }
+            Message::ToggleShowHidden => {
+                self.show_hidden = !self.show_hidden;
+                self.bump();
+            }
+            Message::FitDistortion(v) => {
+                self.fit_distortion = v;
+                // fitting a newly unlocked calibration takes effect at once
+                if v && self.known.len() >= 4 {
+                    self.refit();
+                }
+            }
+            Message::Fit => {
+                self.fit = true;
+                self.zoom = self.fit_zoom();
+                self.panv = Vector::ZERO;
+            }
+            Message::ZoomIn => {
+                return self.update_vp(VpMsg::ZoomAt { factor: 1.25, img: cosmic::iced::Point::ORIGIN });
+            }
+            Message::ZoomOut => {
+                return self.update_vp(VpMsg::ZoomAt { factor: 0.8, img: cosmic::iced::Point::ORIGIN });
+            }
+            Message::About(b) => self.about = b,
+            Message::Quit => {
+                if let Some(id) = self.core.main_window_id() {
+                    return cosmic::iced::window::close(id);
+                }
+            }
+        }
+        Task::none()
+    }
+
+    /// The settings panel lives in the framework-managed left nav slot
+    /// (standard padding, condensed-mode handling, collapse state).
+    fn nav_bar(&self) -> Option<Element<'_, cosmic::Action<Message>>> {
+        if !self.core().nav_bar_active() {
+            return None;
+        }
+        let close: Element<Message> = widget::button::icon(
+            widget::icon::from_name("pan-start-symbolic").size(16),
+        )
+        .on_press(Message::ToggleNav)
+        .into();
+        let panel: Element<Message> = widget::container(
+            widget::column::with_children([
+                widget::row::with_children([
+                    widget::text::heading("gipfel").into(),
+                    widget::container(close)
+                        .width(Length::Fill)
+                        .align_x(cosmic::iced::alignment::Horizontal::Right)
+                        .into(),
+                ])
+                .align_y(cosmic::iced::alignment::Vertical::Center)
+                .spacing(8)
+                .into(),
+                widget::scrollable(self.sidebar()).into(),
+            ])
+            .spacing(10),
+        )
+        .padding([10, 12])
+        .width(Length::Fixed(340.0))
+        .height(Length::Fill)
+        .class(cosmic::theme::Container::Secondary)
+        .into();
+        Some(panel.map(cosmic::Action::App))
+    }
+
+    fn view(&self) -> Element<'_, Message> {
+        let content: Element<Message> = match &self.project {
+            Some(p) => {
+                let vp = ViewportWidget::<Message> {
+                    handle: p.handle.clone(),
+                    img_w: p.w as f32,
+                    img_h: p.h as f32,
+                    zoom: self.zoom,
+                    pan: self.panv,
+                    markers: self.markers(),
+                    track: self.track_pts(),
+                    hover: self.hover,
+                    ctrl: self.ctrl,
+                    font_size: self.label_font,
+                    version: self.version,
+                    _msg: PhantomData,
+                };
+                let vp: Element<Message> = Element::new(vp);
+                // standard popover context menu (like cosmic-files): opens in
+                // its own surface, never shifts the main content
+                let vp: Element<Message> =
+                    cosmic::widget::context_menu(vp, self.context_menu_tree())
+                        .window_id(
+                            self.core
+                                .main_window_id()
+                                .unwrap_or(cosmic::iced::window::Id::RESERVED),
+                        )
+                        .on_surface_action(Message::Surface)
+                        .into();
+                if self.compass_style == CompassStyle::Off {
+                    vp
+                } else {
+                    let fov = match self.pan.projection_type {
+                        ProjectionType::Rectilinear => (
+                            2.0 * ((p.w as f64 * 0.5) / self.pan.parms.scale).atan()
+                        )
+                        .to_degrees(),
+                        ProjectionType::Cylindrical => {
+                            (p.w as f64 / self.pan.parms.scale).to_degrees()
+                        }
+                    };
+                    let strip: Element<Message> = Element::new(Compass {
+                        style: self.compass_style,
+                        center_deg: self.pan.get_center_angle(),
+                        zoom: self.zoom,
+                        pan_x: self.panv.x,
+                        parms: self.pan.parms,
+                        ptype: self.pan.projection_type,
+                        fov_deg: fov,
+                        max_view_angle: self.pan.max_view_angle,
+                        on_change: Rc::new(Message::Center),
+                    });
+                    widget::column::with_children([vp, strip]).into()
+                }
+            }
+            None => widget::container(
+                widget::column::with_children([
+                    widget::text::title2("gipfel").into(),
+                    widget::text("Open a JPEG to start (File ▸ Open Image…, Ctrl+O).").into(),
+                    widget::button::suggested("Open Image…").on_press(Message::OpenImage).into(),
+                ])
+                .spacing(12)
+                .align_x(cosmic::iced::alignment::Horizontal::Center),
+            )
+            .into(),
+        };
+
+        let main: Element<Message> = content;
+
+        let status_text = self.hover_info.as_deref().unwrap_or(&self.status);
+        let status: Element<Message> = widget::container(widget::text::body(status_text.to_string()))
+            .padding([4, 10])
+            .width(Length::Fill)
+            .style(|_: &Theme| widget::container::Style {
+                background: Some(cosmic::iced::Background::Color(Color::from_rgba(0.0, 0.0, 0.0, 0.15))),
+                ..Default::default()
+            })
+            .into();
+
+        let body: Element<Message> = widget::column::with_children([main, status]).into();
+
+        if let Some(picker) = &self.picker {
+            return self.with_dialog(body, self.view_picker(picker));
+        }
+        if self.about {
+            return self.with_dialog(body, self.view_about());
+        }
+        body
+    }
+}
+
+// helpers split out to keep view() readable
+
+/// settings row with the label above a full-width, easy-grip slider
+fn slider_item(
+    label: &str,
+    value: String,
+    slider: impl Into<Element<'static, Message>>,
+) -> Element<'static, Message> {
+    let header: Element<'static, Message> = widget::row::with_children([
+        widget::text::body(label.to_string()).into(),
+        widget::container(widget::text::body(value))
+            .width(Length::Fill)
+            .align_x(cosmic::iced::alignment::Horizontal::Right)
+            .into(),
+    ])
+    .into();
+    let body: Element<'static, Message> = slider.into();
+    widget::column::with_children([header, body])
+        .spacing(2)
+        .into()
+}
+
+/// Async file chooser: returns the chosen path, or None if cancelled.
+async fn pick_open(
+    title: &str,
+    filter: cosmic::dialog::file_chooser::FileFilter,
+) -> Option<PathBuf> {
+    cosmic::dialog::file_chooser::open::Dialog::new()
+        .title(title.to_string())
+        .filter(filter)
+        .open_file()
+        .await
+        .ok()?
+        .url()
+        .to_file_path()
+        .ok()
+}
+
+/// Async save dialog: returns the target path, or None if cancelled.
+async fn pick_save(
+    title: &str,
+    filter: cosmic::dialog::file_chooser::FileFilter,
+) -> Option<PathBuf> {
+    cosmic::dialog::file_chooser::save::Dialog::new()
+        .title(title.to_string())
+        .filter(filter)
+        .save_file()
+        .await
+        .ok()?
+        .url()
+        .and_then(|u| u.to_file_path().ok())
+}
+
+impl Gipfel {
+    fn with_dialog<'a>(&self, body: Element<'a, Message>, dialog: Element<'a, Message>) -> Element<'a, Message> {
+        widget::column::with_children([
+            widget::container(dialog).width(Length::Fill).into(),
+            body,
+        ])
+        .into()
+    }
+
+    fn view_picker<'a>(&self, p: &'a Picker) -> Element<'a, Message> {
+        let entries = self.picker_entries(p);
+        let mut list = widget::column::with_capacity(entries.len());
+        let mut empty = true;
+        for (label, idx) in entries {
+            empty = false;
+            list = list.push(
+                widget::button::text(label)
+                    .on_press(Message::PickerPick(idx))
+                    .width(Length::Fill),
+            );
+        }
+        if empty {
+            list = list.push(widget::text("no matches"));
+        }
+
+        widget::dialog()
+            .title(p.title.clone())
+            .body("Type to search, click to select.")
+            .control(
+                widget::text_input("search…", &p.query)
+                    .on_input(Message::PickerQuery),
+            )
+            .control({
+                    let el: Element<Message> = list.into();
+                    widget::scrollable(el).height(Length::Fixed(320.0))
+                })
+            .secondary_action(widget::button::text("Cancel").on_press(Message::PickerClose))
+            .is_overlay(false)
+            .into()
+    }
+
+    fn context_menu_tree(&self) -> Option<Vec<menu::Tree<Message>>> {
+        let ctx = self.context.as_ref()?;
+        let mut items: Vec<menu::Item<CtxAction, String>> = Vec::new();
+        // placing a marker only makes sense on empty image space, not on an
+        // existing peak marker
+        if ctx.hit.is_none() {
+            items.push(menu::Item::Button(
+                "Find Peak…".to_string(),
+                None,
+                CtxAction::FindPeak(ctx.img_x, ctx.img_y),
+            ));
+        }
+        if let Some(i) = ctx.hit {
+            let h = &self.pan.hills[i];
+            items.push(menu::Item::Button(
+                format!(
+                    "{} {} ({} m)",
+                    if h.flags & FLAG_HIDDEN != 0 { "Unhide" } else { "Hide" },
+                    h.name,
+                    h.height as i64
+                ),
+                None,
+                CtxAction::ToggleHidden(i),
+            ));
+        }
+        if items.is_empty() {
+            return None;
+        }
+        Some(menu::items(&std::collections::HashMap::new(), items))
+    }
+
+    fn view_about<'a>(&self) -> Element<'a, Message> {
+        widget::dialog()
+            .title("About gipfel")
+            .body("gipfel 0.5.0 (COSMIC preview)")
+            .control(widget::text("Annotate mountain panoramas."))
+            .control(widget::text("Port of gipfel by Johannes Hofmann - mathematical models unchanged."))            .primary_action(widget::button::suggested("Close").on_press(Message::About(false)))
+            .is_overlay(false)
+            .into()
+    }
+
+    fn sidebar(&self) -> Element<'_, Message> {
+        let has_img = self.project.is_some();
+        let focal = self.focal_35mm().clamp(1.0, 300.0);
+        let pitch = self.pan.get_pitch_angle().clamp(-40.0, 20.0);
+        let roll = self.pan.get_roll_angle().clamp(-10.0, 10.0);
+        let vis = self.pan.height_dist_ratio.clamp(0.01, 0.1);
+        let vis_ui = 0.11 - vis; // slider: right = more hills visible
+        let label_font = self.label_font;
+        let center = self.pan.get_center_angle().rem_euclid(360.0);
+
+        let vp_name = self
+            .pan
+            .view_name
+            .clone()
+            .unwrap_or_else(|| "manual".to_string());
+
+        let sec_viewpoint = widget::settings::section()
+            .title("Viewpoint")
+            .add(widget::settings::item(
+                "Position",
+                widget::row::with_children([
+                    widget::text(vp_name).into(),
+                    widget::button::text("Choose…").on_press(Message::ChooseViewpoint).into(),
+                ])
+                .spacing(8),
+            ))
+            .add(widget::settings::item(
+                "Latitude",
+                widget::text_input("°", &self.lat_in)
+                    .on_input(Message::Lat)
+                    .on_submit(|_| Message::ViewApply),
+            ))
+            .add(widget::settings::item(
+                "Longitude",
+                widget::text_input("°", &self.lon_in)
+                    .on_input(Message::Lon)
+                    .on_submit(|_| Message::ViewApply),
+            ))
+            .add(widget::settings::item(
+                "Height (m)",
+                widget::text_input("m", &self.height_in)
+                    .on_input(Message::Height)
+                    .on_submit(|_| Message::ViewApply),
+            ));
+
+        let sec_orientation = widget::settings::section()
+            .title("Orientation")
+            .add(widget::settings::item(
+                "Center (deg)",
+                widget::text(format!("{center:.1}°")),
+            ))
+            .add(slider_item(
+                "Focal length (35mm)",
+                format!("{focal:.1} mm"),
+                widget::slider(1.0..=300.0, focal, Message::Focal)
+                    .step(0.01)
+                    .height(30.0),
+            ))
+            .add(slider_item(
+                "Pitch (deg)",
+                format!("{pitch:.1}°"),
+                widget::slider(-40.0..=20.0, pitch, Message::Pitch)
+                    .step(0.01)
+                    .height(30.0),
+            ))
+            .add(slider_item(
+                "Roll (deg)",
+                format!("{roll:.1}°"),
+                widget::slider(-10.0..=10.0, roll, Message::Roll)
+                    .step(0.01)
+                    .height(30.0),
+            ));
+
+        let sec_display = widget::settings::section()
+            .title("Display")
+            .add(slider_item(
+                "Visibility",
+                format!("{:.0}%", (vis_ui - 0.01) / 0.09 * 100.0),
+                widget::slider(0.01..=0.1, vis_ui, Message::Visibility)
+                    .step(0.001)
+                    .height(30.0),
+            ))
+            .add(slider_item(
+                "Track width",
+                format!("{:.0} m at 1 km", self.track_width),
+                widget::slider(1.0..=500.0, self.track_width, Message::TrackWidth)
+                    .step(1.0)
+                    .height(30.0),
+            ))
+            .add(slider_item(
+                "Label size",
+                format!("{label_font:.0} px"),
+                widget::slider(8.0f32..=28.0, label_font, Message::LabelFont)
+                    .step(1.0)
+                    .height(30.0),
+            ))
+            .add(widget::settings::item(
+                "Show hidden",
+                widget::toggler(self.show_hidden).on_toggle(|_| Message::ToggleShowHidden),
+            ))
+            .add(widget::row::with_children([
+                widget::button::text("Zoom −").on_press(Message::ZoomOut).into(),
+                widget::button::text("Fit").on_press(Message::Fit).into(),
+                widget::button::text("Zoom +").on_press(Message::ZoomIn).into(),
+                widget::text(format!("{:.0}%", self.zoom * 100.0)).into(),
+            ])
+            .spacing(8));
+
+        let sec_projection = widget::settings::section().title("Projection").add(
+            widget::row::with_children([
+                widget::radio(
+                    "Normal",
+                    ProjectionType::Rectilinear,
+                    Some(self.pan.projection_type),
+                    Message::Projection,
+                )
+                .into(),
+                widget::radio(
+                    "Panoramic",
+                    ProjectionType::Cylindrical,
+                    Some(self.pan.projection_type),
+                    Message::Projection,
+                )
+                .into(),
+            ])
+            .spacing(16),
+        );
+
+        // distortion fitting is locked unless enough markers are placed
+        let can_fit = self.known.len() >= 4;
+        let fit_cb = widget::checkbox(self.fit_distortion);
+        let fit_cb = if can_fit {
+            fit_cb.on_toggle(Message::FitDistortion)
+        } else {
+            fit_cb.on_toggle_maybe(None as Option<fn(bool) -> Message>)
+        };
+        let mut fit_col = vec![fit_cb.into()];
+        if !can_fit {
+            fit_col.push(widget::text("position 4 or more markers to enable").size(11).into());
+        }
+
+        // fixed-width label column: every control starts at the same x and
+        // therefore shares the same width (settings::item sizes labels to
+        // their text, which made the profile field narrower than k0/k1/x0)
+        let mut sec_distortion = widget::settings::section()
+            .title("Distortion")
+            .add(widget::settings::item_row(vec![
+                widget::text("Fit distortion").width(110).into(),
+                widget::column::with_children(fit_col).spacing(2).into(),
+            ]))
+            .add(widget::settings::item_row(vec![
+                widget::text("k0").width(110).into(),
+                widget::text_input("0", &self.k0_in)
+                    .on_input(Message::K0)
+                    .on_submit(|_| Message::DistortionApply)
+                    .into(),
+            ]))
+            .add(widget::settings::item_row(vec![
+                widget::text("k1").width(110).into(),
+                widget::text_input("0", &self.k1_in)
+                    .on_input(Message::K1)
+                    .on_submit(|_| Message::DistortionApply)
+                    .into(),
+            ]))
+            .add(widget::settings::item_row(vec![
+                widget::text("x0").width(110).into(),
+                widget::text_input("0", &self.x0_in)
+                    .on_input(Message::X0)
+                    .on_submit(|_| Message::DistortionApply)
+                    .into(),
+            ]))
+            .add(widget::settings::item_row(vec![
+                widget::text("profile").width(110).into(),
+                widget::text_input("Camera_Model_50.00_mm", &self.profile_in)
+                    .on_input(Message::ProfileName)
+                    .on_submit(|_| Message::ProfileSave)
+                    .into(),
+            ]))
+            .add(
+                widget::row::with_children([
+                    widget::button::suggested("Save profile")
+                        .on_press(Message::ProfileSave)
+                        .into(),
+                    widget::button::text("Load profile")
+                        .on_press(Message::ProfileLoad)
+                        .into(),
+                ])
+                .spacing(8),
+            );
+        if !self.profiles.is_empty() {
+            // stored profiles (shared with the C version); selecting one
+            // loads its parameters
+            let win = self
+                .core
+                .main_window_id()
+                .unwrap_or(cosmic::iced::window::Id::RESERVED);
+            sec_distortion = sec_distortion.add(widget::settings::item_row(vec![
+                widget::text("stored").width(110).into(),
+                widget::dropdown::popup_dropdown(
+                    self.profiles.clone(),
+                    None,
+                    Message::ProfileSelect,
+                    win,
+                    Message::Surface,
+                    |m| m,
+                )
+                .into(),
+            ]));
+        }
+
+        let mut col = widget::column::with_children([
+            sec_viewpoint.into(),
+            sec_orientation.into(),
+            sec_projection.into(),
+            sec_distortion.into(),
+            sec_display.into(),
+        ])
+        .spacing(12)
+        .padding(12);
+
+        if !has_img {
+            col = col.push(widget::text("Load an image to enable the controls."));
+        }
+        col.into()
+    }
+}
+
+fn main() -> cosmic::iced::Result {
+    let mut flags = Flags { data: None, image: None };
+    let mut args = std::env::args().skip(1);
+    while let Some(a) = args.next() {
+        match a.as_str() {
+            "--data" => flags.data = args.next().map(PathBuf::from),
+            s if !s.starts_with('-') && flags.image.is_none() => flags.image = Some(PathBuf::from(s)),
+            _ => {}
+        }
+    }
+    cosmic::app::run::<Gipfel>(
+        cosmic::app::Settings::default().size(cosmic::iced::Size::new(1280.0, 800.0)),
+        flags,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn elev_inverse_matches_projection() {
+        let mut pan = Panorama::new();
+        pan.set_projection(ProjectionType::Rectilinear);
+        pan.set_center_angle(0.0);
+        pan.set_pitch_angle(0.0);
+        pan.set_scale(200.0);
+        // undistorted rectilinear: y = scale * tan(pitch - elev)
+        for &y in &[-100.0, -30.0, 0.0, 45.0, 120.0] {
+            let e = elev_at_img_y(&pan, y);
+            let (_, y_back) = pan.project_point(0.0, e).unwrap();
+            assert!((y_back - y).abs() < 0.01, "y={y} -> elev={e} -> {y_back}");
+        }
+        // with pitch the band is asymmetric but still invertible
+        pan.set_pitch_angle(10.0);
+        let p = pan.parms.a_pitch;
+        let top = elev_at_img_y(&pan, -100.0);
+        let bot = elev_at_img_y(&pan, 100.0);
+        assert!(top > p && bot < p, "top={top} p={p} bot={bot}");
+        let (_, y_back) = pan.project_point(0.0, top).unwrap();
+        assert!((y_back + 100.0).abs() < 0.01);
+    }
+}
diff --git a/crates/gipfel-app/src/viewport.rs b/crates/gipfel-app/src/viewport.rs
new file mode 100644
index 0000000..3001fc4
--- /dev/null
+++ b/crates/gipfel-app/src/viewport.rs
@@ -0,0 +1,659 @@
+//! The gipfel viewport: a custom widget that draws the photo, hill markers,
+//! decluttered labels, GPS track, and handles all canvas interaction.
+//!
+//! Marker/label placement mirrors the original GipfelWidget::draw/set_labels
+//! (image-space coordinates; the screen transform is applied at draw time).
+
+use std::rc::Rc;
+use std::time::Instant;
+
+use cosmic::iced::advanced::image::{FilterMethod, Handle, Image as CoreImage};
+use cosmic::iced::advanced::renderer::Style as RendererStyle;
+use cosmic::iced::advanced::text::{
+    self as adv_text, paragraph::Plain, LineHeight, Renderer as _,
+};
+use cosmic::iced::advanced::widget::{tree, Tree, Widget as WidgetTrait};
+use cosmic::iced::advanced::{Clipboard, Layout, Shell};
+use cosmic::iced::mouse::{self, Button, Cursor, Interaction, ScrollDelta};
+use cosmic::iced::widget::canvas::{Frame, LineCap, Path, Stroke};
+use cosmic::iced::advanced::graphics::geometry::Style as GeoStyle;
+use cosmic::iced::{
+    alignment, Color, Event, Length, Pixels, Point, Rectangle, Radians, Size, Vector,
+};
+
+use cosmic::Renderer as R;
+use cosmic::Theme;
+
+pub const DEFAULT_LABEL_FONT: f32 = 12.0;
+const CROSS_SIZE: f64 = 4.0;
+
+#[derive(Clone, Debug)]
+pub struct Marker {
+    /// image-space coordinates, origin at image center (like C's m->x/m->y)
+    pub x: f64,
+    pub y: f64,
+    pub name: Rc<str>,
+    pub idx: usize,
+    pub known: bool,
+    pub hidden: bool,
+}
+
+#[derive(Clone, Debug)]
+pub struct TrackPt {
+    pub x: f64,
+    pub y: f64,
+    pub hidden: bool,
+    pub width: f64,
+}
+
+#[derive(Debug, Clone)]
+pub enum VpMsg {
+    /// zoom by `factor`, keeping image point `img` under the cursor
+    ZoomAt { factor: f32, img: Point },
+    PanBy { delta: Vector },
+    PanTo { pan: Vector },
+    MoveMarker { idx: usize, img: Point },
+    DragEnd { had_marker: bool },
+    /// hill index of the toggled marker (None = clicked empty space)
+    ToggleKnown(Option<usize>),
+    ContextAt { img: Point, hit: Option<usize> },
+    /// hill index of the hovered marker
+    Hover(Option<usize>),
+}
+
+#[derive(Clone)]
+struct LabelLayout {
+    version: u64,
+    font_size: f32,
+    zoom: f32,
+    entries: Vec<(f32, f32)>,
+}
+
+#[derive(Default)]
+struct DragState {
+    drag: Drag,
+    last_click: Option<(Instant, Point)>,
+    label_cache: std::cell::RefCell<Option<LabelLayout>>,
+    /// Paragraph primitives must outlive the frame: the renderer stores only a
+    /// Weak reference, so keep strong refs here until the next draw.
+    paragraphs: std::cell::RefCell<Vec<Plain<<R as adv_text::Renderer>::Paragraph>>>,
+}
+
+#[derive(Default, Clone)]
+enum Drag {
+    #[default]
+    None,
+    Marker(usize),
+    Pan { start: Point, pan0: Vector },
+}
+
+pub struct ViewportWidget<M: From<VpMsg> + Send + 'static> {
+    pub handle: Handle,
+    pub img_w: f32,
+    pub img_h: f32,
+    pub zoom: f32,
+    pub pan: Vector,
+    /// hill markers in visible order; label layout depends on this order
+    pub markers: Rc<Vec<Marker>>,
+    pub track: Rc<Vec<TrackPt>>,
+    pub hover: Option<usize>,
+    pub ctrl: bool,
+    /// label font size in pixels (UI-tunable)
+    pub font_size: f32,
+    /// bump whenever marker positions change to invalidate the label cache
+    pub version: u64,
+    pub _msg: std::marker::PhantomData<fn() -> M>,
+}
+
+impl<M: From<VpMsg> + Send + 'static> Clone for ViewportWidget<M> {
+    fn clone(&self) -> Self {
+        ViewportWidget {
+            handle: self.handle.clone(),
+            img_w: self.img_w,
+            img_h: self.img_h,
+            zoom: self.zoom,
+            pan: self.pan,
+            markers: self.markers.clone(),
+            track: self.track.clone(),
+            hover: self.hover,
+            ctrl: self.ctrl,
+            font_size: self.font_size,
+            version: self.version,
+            _msg: std::marker::PhantomData,
+        }
+    }
+}
+
+impl<M: From<VpMsg> + Send + 'static> ViewportWidget<M> {
+    /// line height: paragraph metrics (cosmic LineHeight default = 1.3x) plus
+    /// a 2px gap, so stacked labels never touch
+    fn line_h(&self) -> f32 {
+        self.font_size * 1.3 + 2.0
+    }
+
+    fn center(bounds: Rectangle, pan: Vector) -> Point {
+        Point::new(
+            bounds.x + bounds.width / 2.0 + pan.x,
+            bounds.y + bounds.height / 2.0 + pan.y,
+        )
+    }
+
+    fn to_img(&self, center: Point, p: Point) -> Point {
+        Point::new((p.x - center.x) / self.zoom, (p.y - center.y) / self.zoom)
+    }
+
+    /// hit-test in image space; tolerance scales with zoom (~6 screen px).
+    /// Returns the *hill index* of the hit marker.
+    fn hit(&self, center: Point, p: Point) -> Option<usize> {
+        let img = self.to_img(center, p);
+        let tol = (6.0 / self.zoom).clamp(2.0, 20.0);
+        self.markers
+            .iter()
+            .find(|m| (m.x as f32 - img.x).abs() < tol && (m.y as f32 - img.y).abs() < tol)
+            .map(|m| m.idx)
+    }
+}
+
+impl<M: From<VpMsg> + Send + 'static> WidgetTrait<M, Theme, R> for ViewportWidget<M> {
+    fn size(&self) -> Size<Length> {
+        Size::new(Length::Fill, Length::Fill)
+    }
+
+    fn tag(&self) -> tree::Tag {
+        tree::Tag::of::<DragState>()
+    }
+
+    fn state(&self) -> tree::State {
+        tree::State::new(DragState::default())
+    }
+
+    fn layout(
+        &mut self,
+        _tree: &mut Tree,
+        _renderer: &R,
+        limits: &cosmic::iced::advanced::layout::Limits,
+    ) -> cosmic::iced::advanced::layout::Node {
+        cosmic::iced::advanced::layout::Node::new(limits.max())
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut R,
+        _theme: &Theme,
+        _style: &RendererStyle,
+        layout: Layout<'_>,
+        _cursor: Cursor,
+        _viewport: &Rectangle,
+    ) {
+        use cosmic::iced::advanced::image::Renderer as _;
+        use cosmic::iced::advanced::Renderer as _;
+
+        let bounds = layout.bounds();
+        let center = Self::center(bounds, self.pan);
+        let z = self.zoom;
+
+        // 1. photo
+        let dest = Rectangle::new(
+            Point::new(center.x - self.img_w * z / 2.0, center.y - self.img_h * z / 2.0),
+            Size::new(self.img_w * z, self.img_h * z),
+        );
+        renderer.draw_image(
+            CoreImage {
+                handle: self.handle.clone(),
+                filter_method: FilterMethod::Linear,
+                rotation: Radians(0.0),
+                border_radius: 0.0.into(),
+                opacity: 1.0,
+                snap: false,
+            },
+            dest,
+            bounds,
+        );
+
+        let layout_entries = self.label_layout(tree, renderer);
+
+        // The wgpu renderer draws geometry before images within one layer;
+        // record the overlay in a fresh layer so it lands on top of the photo.
+        renderer.start_layer(bounds);
+        self.draw_overlay(renderer, tree, bounds, center, &layout_entries);
+        renderer.end_layer();
+    }
+
+    fn update(
+        &mut self,
+        tree: &mut Tree,
+        event: &Event,
+        layout: Layout<'_>,
+        cursor: Cursor,
+        _renderer: &R,
+        _clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, M>,
+        _viewport: &Rectangle,
+    ) {
+        let bounds = layout.bounds();
+        let center = Self::center(bounds, self.pan);
+        let state = tree.state.downcast_mut::<DragState>();
+
+        match event {
+            Event::Mouse(mouse::Event::WheelScrolled { delta }) => {
+                let Some(p) = cursor.position_over(bounds) else { return };
+                let (dx, dy) = match delta {
+                    ScrollDelta::Pixels { x, y } => (*x, *y),
+                    ScrollDelta::Lines { x, y } => (*x * 30.0, *y * 30.0),
+                };
+                if self.ctrl {
+                    shell.publish(M::from(VpMsg::ZoomAt {
+                        factor: (1.0 + dy * 0.0015).clamp(0.5, 2.0),
+                        img: self.to_img(center, p),
+                    }));
+                } else {
+                    shell.publish(M::from(VpMsg::PanBy { delta: Vector::new(-dx, -dy) }));
+                }
+                shell.request_redraw();
+            }
+            Event::Mouse(mouse::Event::ButtonPressed(Button::Left)) => {
+                let Some(p) = cursor.position_over(bounds) else { return };
+                let now = Instant::now();
+                let dbl = state
+                    .last_click
+                    .is_some_and(|(t, q)| {
+                        t.elapsed().as_millis() < 400
+                            && (q.x - p.x).abs() < 6.0
+                            && (q.y - p.y).abs() < 6.0
+                    });
+                state.last_click = Some((now, p));
+
+                if dbl {
+                    state.drag = Drag::None;
+                    state.last_click = None;
+                    shell.publish(M::from(VpMsg::ToggleKnown(self.hit(center, p))));
+                    return;
+                }
+
+                if let Some(idx) = self.hit(center, p) {
+                    if self.markers.iter().any(|m| m.idx == idx && m.known) {
+                        state.drag = Drag::Marker(idx);
+                        return;
+                    }
+                }
+                state.drag = Drag::Pan { start: p, pan0: self.pan };
+            }
+            Event::Mouse(mouse::Event::ButtonReleased(Button::Left)) => {
+                let had_marker = matches!(state.drag, Drag::Marker(_));
+                state.drag = Drag::None;
+                shell.publish(M::from(VpMsg::DragEnd { had_marker }));
+            }
+            Event::Mouse(mouse::Event::ButtonPressed(Button::Middle)) => {
+                if let Some(p) = cursor.position_over(bounds) {
+                    shell.publish(M::from(VpMsg::ToggleKnown(self.hit(center, p))));
+                }
+            }
+            Event::Mouse(mouse::Event::ButtonPressed(Button::Right)) => {
+                if let Some(p) = cursor.position_over(bounds) {
+                    shell.publish(M::from(VpMsg::ContextAt {
+                        img: self.to_img(center, p),
+                        hit: self.hit(center, p),
+                    }));
+                }
+            }
+            Event::Mouse(mouse::Event::CursorMoved { .. }) => {
+                match state.drag.clone() {
+                    Drag::Marker(idx) => {
+                        if let Some(p) = cursor.position() {
+                            shell.publish(M::from(VpMsg::MoveMarker {
+                                idx,
+                                img: self.to_img(center, p),
+                            }));
+                            shell.request_redraw();
+                        }
+                    }
+                    Drag::Pan { start, pan0 } => {
+                        if let Some(p) = cursor.position() {
+                            shell.publish(M::from(VpMsg::PanTo {
+                                pan: pan0 + Vector::new(p.x - start.x, p.y - start.y),
+                            }));
+                            shell.request_redraw();
+                        }
+                    }
+                    Drag::None => {
+                        match cursor.position_over(bounds) {
+                            Some(p) => shell.publish(M::from(VpMsg::Hover(self.hit(center, p)))),
+                            // cursor moved off the viewport (e.g. into the
+                            // sidebar): clear any stale hover info
+                            None => shell.publish(M::from(VpMsg::Hover(None))),
+                        }
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
+
+    fn mouse_interaction(
+        &self,
+        _tree: &Tree,
+        layout: Layout<'_>,
+        cursor: Cursor,
+        _viewport: &Rectangle,
+        _renderer: &R,
+    ) -> Interaction {
+        let center = Self::center(layout.bounds(), self.pan);
+        match cursor.position_over(layout.bounds()) {
+            Some(p) if self.hit(center, p).is_some() => Interaction::Pointer,
+            Some(_) => Interaction::Grab,
+            None => Interaction::None,
+        }
+    }
+}
+
+impl<M: From<VpMsg> + Send + 'static> ViewportWidget<M> {
+    fn draw_overlay(
+        &self,
+        renderer: &mut R,
+        tree: &Tree,
+        bounds: Rectangle,
+        center: Point,
+        layout_entries: &[(f32, f32)],
+    ) {
+        use cosmic::iced::advanced::graphics::geometry::Renderer as _;
+        use cosmic::iced::advanced::text::Renderer as _;
+
+        let z = self.zoom;
+        let to_screen = |p: Point| Point::new(center.x + p.x * z, center.y + p.y * z);
+        let layout_entries = layout_entries;
+        let mut frame = Frame::with_bounds(renderer, bounds);
+
+        // 2. GPS track
+        for w in self.track.windows(2) {
+            let (a, b) = (&w[0], &w[1]);
+            let pa = to_screen(Point::new(a.x as f32, a.y as f32));
+            let pb = to_screen(Point::new(b.x as f32, b.y as f32));
+            let color = if a.hidden {
+                Color::from_rgb(0.2, 0.4, 1.0)
+            } else {
+                Color::from_rgb(1.0, 0.2, 0.2)
+            };
+            let stroke = Stroke {
+                width: (a.width as f32 * z).max(1.0),
+                style: GeoStyle::Solid(color),
+                line_cap: LineCap::Round,
+                ..Default::default()
+            };
+            let path = Path::new(|bld| {
+                bld.move_to(pa);
+                bld.line_to(pb);
+            });
+            frame.stroke(&path, stroke);
+        }
+
+        // 3. hill markers: crosses + leaders
+        // C's draw() skips markers outside the image (fabs(x) > w/2 || ...);
+        // must match label_layout's filter, otherwise off-image markers get
+        // drawn (in the letterbox area) without ever being laid out.
+        let in_img = |m: &Marker| {
+            m.x.abs() * 2.0 <= self.img_w as f64 && m.y.abs() * 2.0 <= self.img_h as f64
+        };
+        let yellow = Color::from_rgb(1.0, 0.9, 0.2);
+        for (i, m) in self.markers.iter().enumerate() {
+            if !in_img(m) {
+                continue;
+            }
+            let p = to_screen(Point::new(m.x as f32, m.y as f32));
+            if !bounds.contains(p) {
+                continue;
+            }
+            let (lx, ly) = layout_entries[i];
+            let d = CROSS_SIZE as f32;
+            let label_line = p.y + ly - self.line_h();
+            let stroke = Stroke {
+                width: 1.0,
+                style: GeoStyle::Solid(yellow),
+                ..Default::default()
+            };
+            let path = Path::new(|bld| {
+                bld.move_to(Point::new(p.x - d, p.y));
+                bld.line_to(Point::new(p.x + d, p.y));
+                bld.move_to(Point::new(p.x, p.y));
+                bld.line_to(Point::new(p.x, label_line));
+                bld.move_to(Point::new(p.x, label_line));
+                bld.line_to(Point::new(p.x + lx, label_line));
+            });
+            frame.stroke(&path, stroke);
+        }
+
+        // known-hill flags (pole + pennant + circle)
+        let flag_color = Color::from_rgb(1.0, 0.25, 0.25);
+        for m in self.markers.iter().filter(|m| m.known) {
+            if !in_img(m) {
+                continue;
+            }
+            let p = to_screen(Point::new(m.x as f32, m.y as f32));
+            if !bounds.contains(p) {
+                continue;
+            }
+            let stroke = Stroke {
+                width: 1.5,
+                style: GeoStyle::Solid(flag_color),
+                ..Default::default()
+            };
+            let pole = Path::new(|bld| {
+                bld.move_to(p);
+                bld.line_to(Point::new(p.x, p.y - 16.0));
+                bld.circle(p, 3.0);
+            });
+            let pennant = Path::new(|bld| {
+                bld.move_to(Point::new(p.x, p.y - 16.0));
+                bld.line_to(Point::new(p.x + 10.0, p.y - 13.0));
+                bld.line_to(Point::new(p.x, p.y - 10.0));
+                bld.close();
+            });
+            frame.stroke(&pole, stroke.clone());
+            frame.fill(&pennant, flag_color);
+        }
+
+        renderer.draw_geometry(frame.into_geometry());
+
+        // 4. labels (screen space, constant font size)
+        let font = renderer.default_font();
+        let size = Pixels(self.font_size);
+        // the renderer keeps only a Weak ref to each paragraph, so hold strong
+        // refs in the widget state until the next frame replaces them
+        let state = tree.state.downcast_ref::<DragState>();
+        {
+            let mut paras = state.paragraphs.borrow_mut();
+            paras.clear();
+            paras.reserve(self.markers.len());
+            for m in self.markers.iter() {
+                paras.push(self.make_paragraph(font, size, &m.name));
+            }
+        }
+        let paras = state.paragraphs.borrow();
+
+        for (i, m) in self.markers.iter().enumerate() {
+            if !in_img(m) {
+                continue;
+            }
+            let p = to_screen(Point::new(m.x as f32, m.y as f32));
+            if !bounds.contains(p) {
+                continue;
+            }
+            let (_, ly) = layout_entries[i];
+            let pos = Point::new(p.x + 2.0, p.y + ly - self.line_h());
+            let is_hover = self.hover == Some(m.idx);
+
+            let para = &paras[i];
+            let mb = para.min_bounds();
+
+            let mut bg = Frame::with_bounds(renderer, bounds);
+            let rect = Rectangle::new(
+                Point::new(p.x + 1.0, pos.y - 1.0),
+                Size::new(mb.width + 2.0, mb.height + 1.0),
+            );
+            let path = Path::new(|bld| bld.rectangle(rect.position(), rect.size()));
+            bg.fill(
+                &path,
+                if is_hover {
+                    Color::from_rgba(1.0, 0.9, 0.2, 0.95)
+                } else {
+                    Color::from_rgba(0.0, 0.0, 0.0, 0.55)
+                },
+            );
+            renderer.draw_geometry(bg.into_geometry());
+
+            let color = if is_hover {
+                Color::BLACK
+            } else if m.hidden {
+                Color::from_rgb(0.4, 0.6, 1.0)
+            } else {
+                Color::WHITE
+            };
+            renderer.fill_paragraph(
+                para.raw(),
+                Point::new(p.x + 2.0, pos.y),
+                color,
+                bounds,
+            );
+        }
+    }
+
+    fn make_paragraph(&self, font: <R as adv_text::Renderer>::Font, size: Pixels, text: &str) -> Plain<<R as adv_text::Renderer>::Paragraph> {
+        Plain::<<R as adv_text::Renderer>::Paragraph>::new(adv_text::Text {
+            content: text.to_string(),
+            bounds: Size::new(600.0, 40.0),
+            size,
+            line_height: LineHeight::default(),
+            font,
+            align_x: alignment::Horizontal::Left.into(),
+            align_y: alignment::Vertical::Top.into(),
+            shaping: adv_text::Shaping::Basic,
+            wrapping: adv_text::Wrapping::None,
+            ellipsize: adv_text::Ellipsize::None,
+        })
+    }
+
+    /// C set_labels port: place labels above crosses, pushing colliding ones up.
+    /// Markers outside the image are skipped entirely (C: fabs(x) > w/2 filter),
+    /// so off-image peaks never push visible labels up.
+    fn label_layout(&self, tree: &Tree, renderer: &mut R) -> Vec<(f32, f32)> {
+        let state = tree.state.downcast_ref::<DragState>();
+        if let Some(l) = state.label_cache.borrow().as_ref() {
+            if l.version == self.version
+                && l.font_size == self.font_size
+                && l.zoom == self.zoom
+                && l.entries.len() == self.markers.len()
+            {
+                return l.entries.clone();
+            }
+        }
+
+        let font = renderer.default_font();
+        let size = Pixels(self.font_size);
+        let line_h = self.line_h();
+
+        let widths: Vec<f32> = self
+            .markers
+            .iter()
+            .map(|m| self.make_paragraph(font, size, &m.name).min_bounds().width)
+            .collect();
+
+        // C: fabs(m->x) > img->w()/2 || fabs(m->y) > img->h()/2 -> skip
+        // (marker coords are center-relative, like C's m->x/m->y)
+        let in_img: Vec<bool> = self
+            .markers
+            .iter()
+            .map(|m| m.x.abs() * 2.0 <= self.img_w as f64 && m.y.abs() * 2.0 <= self.img_h as f64)
+            .collect();
+
+        // Labels are drawn at constant size in *screen* space, so collisions
+        // depend on the on-screen distance between markers: run the layout on
+        // zoom-scaled coordinates (C had no zoom, image space == screen space).
+        let z = self.zoom;
+        let sx: Vec<f32> = self.markers.iter().map(|m| m.x as f32 * z).collect();
+        let sy: Vec<f32> = self.markers.iter().map(|m| m.y as f32 * z).collect();
+
+        let entries = layout_label_y(&sx, &sy, &widths, &in_img, line_h);
+        *state.label_cache.borrow_mut() = Some(LabelLayout {
+            version: self.version,
+            font_size: self.font_size,
+            zoom: self.zoom,
+            entries: entries.clone(),
+        });
+        entries
+    }
+}
+
+/// Shared label collision-avoidance layout, used for both the on-screen
+/// viewport and the screen dump so the dump shows exactly the same label
+/// placement (plan.md M3: same code path).
+///
+/// `xs`/`ys` are marker positions (center-relative) in one uniform pixel
+/// space, `widths` the label widths and `line_h` the line height, all in
+/// that same space. Markers must be ordered by x (the sweep breaks on the
+/// first non-overlapping predecessor). Returns `(label_width + 1, y_offset)`
+/// per marker; the label is drawn at `(marker.x + 2, marker.y + y_offset -
+/// line_h)`.
+pub fn layout_label_y(
+    xs: &[f32],
+    ys: &[f32],
+    widths: &[f32],
+    in_img: &[bool],
+    line_h: f32,
+) -> Vec<(f32, f32)> {
+    let n = xs.len();
+    let mut label_x = vec![0.0f32; n];
+    let mut label_y = vec![0.0f32; n];
+    let cross = CROSS_SIZE as f32;
+    let overlap = |a1: f32, l1: f32, a2: f32, l2: f32| a1 <= a2 + l2 && a1 + l1 >= a2;
+
+    for i in 0..n {
+        if !in_img[i] {
+            continue;
+        }
+        label_x[i] = widths[i] + 1.0;
+        label_y[i] = 0.0;
+
+        let mut colliding: Vec<usize> = Vec::new();
+        for j in (0..i).rev() {
+            if !in_img[j] {
+                continue;
+            }
+            if overlap(xs[i], label_x[i], xs[j] - cross, label_x[j]) {
+                colliding.push(j);
+            } else {
+                break;
+            }
+        }
+        colliding.sort_by(|&a, &b| {
+            let ya = ys[a] + label_y[a];
+            let yb = ys[b] + label_y[b];
+            yb.total_cmp(&ya)
+        });
+        // C does a single overwrite pass here, which can leave overlaps
+        // when a push moves the label into a band that was already
+        // checked. Iterate to a fixed point instead (converges quickly:
+        // each round only moves the label up, bounded by the stack).
+        for _round in 0..64 {
+            let mut pushed = false;
+            for &j in &colliding {
+                if overlap(
+                    ys[i] + label_y[i] - line_h,
+                    line_h,
+                    ys[j] + label_y[j] - line_h,
+                    line_h,
+                ) || overlap(ys[i] + label_y[i] - line_h, line_h, ys[j] - cross, 2.0 * cross) {
+                    let ny = (ys[j] + label_y[j] - ys[i] - line_h - 2.0).round();
+                    if ny < label_y[i] {
+                        label_y[i] = ny;
+                        pushed = true;
+                    }
+                }
+            }
+            if !pushed {
+                break;
+            }
+        }
+    }
+
+    (0..n).map(|i| (label_x[i], label_y[i])).collect()
+}
diff --git a/crates/gipfel-cli/Cargo.toml b/crates/gipfel-cli/Cargo.toml
new file mode 100644
index 0000000..9f0f96d
--- /dev/null
+++ b/crates/gipfel-cli/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "gipfel-cli"
+version = "0.1.0"
+edition = "2021"
+description = "gipfel command line tools (export-position, export-hills)"
+license = "GPL-2.0-or-later"
+
+[[bin]]
+name = "gipfel-cli"
+path = "src/main.rs"
+
+[dependencies]
+gipfel-core = { path = "../gipfel-core" }
diff --git a/crates/gipfel-cli/src/main.rs b/crates/gipfel-cli/src/main.rs
new file mode 100644
index 0000000..f0690a8
--- /dev/null
+++ b/crates/gipfel-cli/src/main.rs
@@ -0,0 +1,371 @@
+//! gipfel-cli: headless command line tools, mirroring the C binary's
+//! `-p/--export-position`, `-e/--export-hills` and stitch modes.
+
+use gipfel_core::hill::FLAG_EXPORT;
+use gipfel_core::metadata::{apply_image_metadata, image_dimensions, ImageMetaData};
+use gipfel_core::panorama::Panorama;
+use gipfel_core::stitch::{self, ScanMode};
+
+fn usage() {
+    eprintln!(
+        "usage: gipfel-cli <command> [options]\n\
+         \n\
+         commands:\n\
+         \x20 export-position <img>                          print position CSV line\n\
+         \x20 export-hills <img> [-d <data>] [-e <hills>]    export hill positions\n\
+         \x20 info <img>                                     show parsed metadata\n\
+         \x20 stitch [-t out.tif [-4]] [-j out.jpg] [-w N]\n\
+         \x20   [-h N] [-r from,to] [-b] img...              cylindrical panorama\n\
+         \x20 profiles                                       list distortion profiles\n\
+         \x20 profile-save <name> <k0> <k1> <x0>             save a profile\n"
+    );
+}
+
+fn export_position(img: &str) -> i32 {
+    // C reads metadata directly (no image decode); missing values print as nan
+    let mut md = ImageMetaData::new();
+    md.load_image(img);
+
+    // C: printf(",%s,,%f,%f,%d\n", img_file, latitude, longitude, (int)rint(height))
+    println!(
+        ",{},,{},{},{}",
+        img,
+        fmt_f(md.latitude),
+        fmt_f(md.longitude),
+        md.height.round_ties_even() as i64
+    );
+    0
+}
+
+fn fmt_f(v: f64) -> String {
+    if v.is_nan() {
+        "nan".to_string()
+    } else {
+        format!("{:.6}", v)
+    }
+}
+
+fn export_hills(img: &str, data: &str, export_file: Option<&str>) -> i32 {
+    let Some((w, h)) = image_dimensions(img) else {
+        eprintln!("could not read image {}", img);
+        return 1;
+    };
+
+    let mut md = ImageMetaData::new();
+    md.load_image(img);
+
+    let mut pan = Panorama::new();
+    let have_info = apply_image_metadata(&mut pan, &md, w, h);
+
+    if let Err(e) = pan.load_data(data) {
+        eprintln!("Could not load datafile {}: {}", data, e);
+        return 1;
+    }
+    pan.set_height_dist_ratio(0.07); // C default "visibility"
+
+    if !have_info {
+        eprintln!("No gipfel info available for {}.", img);
+        return 0;
+    }
+
+    // -e: restrict export to the hills from the given file
+    if let Some(file) = export_file {
+        match gipfel_core::hill::load(file) {
+            Ok(mut extra) => {
+                for m in extra.iter_mut() {
+                    m.flags |= FLAG_EXPORT;
+                }
+                pan.add_hills(&extra);
+            }
+            Err(_) => return 1,
+        }
+    }
+
+    println!("#\n# name\theight\tx\ty\tdistance\tflags\n#");
+
+    for row in pan.export_hill_rows(w as i64, h as i64, export_file.is_some()) {
+        println!("{}", row);
+    }
+
+    if export_file.is_some() {
+        for m in pan.hills.iter_mut() {
+            m.flags &= !FLAG_EXPORT;
+        }
+    }
+
+    0
+}
+
+/// Port of the C stitch mode: resample the given images into one
+/// cylindrical panorama. Flags follow the C binary: -w/-h output size,
+/// -r from,to azimuth range in degrees, -b bicubic, -4 16-bit TIFF,
+/// -j/-t output file (tiff wins if both given, as in C).
+fn stitch(imgs: &[String], opts: &StitchOpts) -> i32 {
+    if imgs.is_empty() || (opts.tiff.is_none() && opts.jpeg.is_none()) {
+        usage();
+        return 2;
+    }
+    let mut sources = Vec::new();
+    for img in imgs {
+        match stitch::StitchSource::load(img) {
+            Ok(s) => sources.push(s),
+            Err(e) => {
+                eprintln!("{e}");
+                return 1;
+            }
+        }
+    }
+    let mode = if opts.bicubic { ScanMode::Bicubic } else { ScanMode::Nearest };
+    let out = stitch::resample(&sources, mode, opts.w, opts.h, opts.from, opts.to);
+    let hit = out.hit.iter().filter(|h| **h).count();
+    eprintln!(
+        "stitched {}x{}: {}/{} pixels covered",
+        out.w, out.h, hit, out.hit.len()
+    );
+    let res = if let Some(path) = &opts.tiff {
+        stitch::write_tiff(path, &out, opts.bits16)
+    } else {
+        stitch::write_jpeg(opts.jpeg.as_ref().unwrap(), &out, 90)
+    };
+    match res {
+        Ok(()) => 0,
+        Err(e) => {
+            eprintln!("{e}");
+            1
+        }
+    }
+}
+
+struct StitchOpts {
+    w: u32,
+    h: u32,
+    from: f64,
+    to: f64,
+    bicubic: bool,
+    bits16: bool,
+    tiff: Option<String>,
+    jpeg: Option<String>,
+}
+
+/// C defaults: stitch_w=2000, stitch_h=500, stitch_from=0.0, stitch_to=380.0
+fn stitch_defaults() -> StitchOpts {
+    StitchOpts {
+        w: 2000,
+        h: 500,
+        from: 0.0,
+        to: 380.0,
+        bicubic: false,
+        bits16: false,
+        tiff: None,
+        jpeg: None,
+    }
+}
+
+fn stitch_cmd(args: &[String]) -> i32 {
+    let mut o = stitch_defaults();
+    let mut imgs = Vec::new();
+    let mut i = 0;
+    while i < args.len() {
+        let a = args[i].as_str();
+        let need = |i: &mut usize| -> Option<String> {
+            if *i + 1 < args.len() {
+                *i += 1;
+                Some(args[*i].clone())
+            } else {
+                None
+            }
+        };
+        let ok = match a {
+            "-w" => match need(&mut i) {
+                Some(v) => {
+                    o.w = v.parse().unwrap_or(2000);
+                    true
+                }
+                None => false,
+            },
+            "-h" => match need(&mut i) {
+                Some(v) => {
+                    o.h = v.parse().unwrap_or(500);
+                    true
+                }
+                None => false,
+            },
+            "-r" => match need(&mut i) {
+                Some(v) => {
+                    // C: atof(optarg) [, atof(after comma)] — atof reads the
+                    // numeric prefix before the comma
+                    let (first, second) = v.split_once(',').unwrap_or((v.as_str(), ""));
+                    o.from = first.trim().parse().unwrap_or(0.0);
+                    if !second.trim().is_empty() {
+                        o.to = second.trim().parse().unwrap_or(380.0);
+                    }
+                    true
+                }
+                None => false,
+            },
+            "-j" => match need(&mut i) {
+                Some(v) => {
+                    o.jpeg = Some(v);
+                    true
+                }
+                None => false,
+            },
+            "-t" => match need(&mut i) {
+                Some(v) => {
+                    o.tiff = Some(v);
+                    true
+                }
+                None => false,
+            },
+            "-b" => {
+                o.bicubic = true;
+                true
+            }
+            "-4" => {
+                o.bits16 = true;
+                true
+            }
+            _ => {
+                if a.starts_with('-') {
+                    false
+                } else {
+                    imgs.push(a.to_string());
+                    true
+                }
+            }
+        };
+        if !ok {
+            usage();
+            return 2;
+        }
+        i += 1;
+    }
+    stitch(&imgs, &o)
+}
+
+fn info(img: &str) -> i32 {
+    let mut md = ImageMetaData::new();
+    md.load_image(img);
+    println!("manufacturer:        {:?}", md.manufacturer);
+    println!("model:               {:?}", md.model);
+    println!("longitude:           {}", md.longitude);
+    println!("latitude:            {}", md.latitude);
+    println!("height:              {}", md.height);
+    println!("direction:           {}", md.direction);
+    println!("pitch:               {}", md.pitch);
+    println!("roll:                {}", md.roll);
+    println!("focal_length:        {}", md.focal_length);
+    println!("focal_length_35mm:   {}", md.focal_length_35mm);
+    println!("projection type:     {}", md.projection_type);
+    println!("k0:                  {}", md.k0);
+    println!("k1:                  {}", md.k1);
+    println!("x0:                  {}", md.x0);
+    0
+}
+
+fn profiles() -> i32 {
+    let all = gipfel_core::profile::list();
+    if all.is_empty() {
+        eprintln!("no profiles in {}", gipfel_core::profile::prefs_path().display());
+    }
+    for (name, p) in all {
+        println!("{name}\tk0={}\tk1={}\tx0={}", p.k0, p.k1, p.x0);
+    }
+    0
+}
+
+fn profile_save(name: &str, k0: f64, k1: f64, x0: f64) -> i32 {
+    let p = gipfel_core::profile::Profile { k0, k1, x0 };
+    match gipfel_core::profile::save(name, p, true) {
+        Ok(()) => {
+            eprintln!("saved profile {name}");
+            0
+        }
+        Err(e) => {
+            eprintln!("{e}");
+            1
+        }
+    }
+}
+
+fn profile_save_cmd(args: &[String]) -> i32 {
+    if args.len() != 4 {
+        usage();
+        return 2;
+    }
+    let (Ok(k0), Ok(k1), Ok(x0)) = (
+        args[1].parse::<f64>(),
+        args[2].parse::<f64>(),
+        args[3].parse::<f64>(),
+    ) else {
+        usage();
+        return 2;
+    };
+    profile_save(&args[0], k0, k1, x0)
+}
+
+fn main() {
+    let args: Vec<String> = std::env::args().collect();
+    let Some(cmd) = args.get(1) else {
+        usage();
+        std::process::exit(2);
+    };
+
+    let code = match cmd.as_str() {
+        "export-position" => {
+            if args.len() != 3 {
+                usage();
+                2
+            } else {
+                export_position(&args[2])
+            }
+        }
+        "export-hills" => {
+            if args.len() < 3 {
+                usage();
+                2
+            } else {
+                let img = &args[2];
+                let mut data = "gipfel.dat".to_string();
+                let mut export_file: Option<String> = None;
+                let mut i = 3;
+                while i < args.len() {
+                    match args[i].as_str() {
+                        "-d" => {
+                            if i + 1 < args.len() {
+                                data = args[i + 1].clone();
+                                i += 1;
+                            }
+                        }
+                        "-e" => {
+                            if i + 1 < args.len() {
+                                export_file = Some(args[i + 1].clone());
+                                i += 1;
+                            }
+                        }
+                        _ => {}
+                    }
+                    i += 1;
+                }
+                export_hills(img, &data, export_file.as_deref())
+            }
+        }
+        "info" => {
+            if args.len() != 3 {
+                usage();
+                2
+            } else {
+                info(&args[2])
+            }
+        }
+        "profiles" => profiles(),
+        "profile-save" => profile_save_cmd(&args[2..]),
+        "stitch" => stitch_cmd(&args[2..]),
+        _ => {
+            usage();
+            2
+        }
+    };
+
+    std::process::exit(code);
+}
diff --git a/crates/gipfel-core/Cargo.toml b/crates/gipfel-core/Cargo.toml
new file mode 100644
index 0000000..d8ddfd9
--- /dev/null
+++ b/crates/gipfel-core/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "gipfel-core"
+version = "0.1.0"
+edition = "2021"
+description = "Port of gipfel's computational core (hills, panorama, projections, least-squares fit, metadata)"
+license = "GPL-2.0-or-later"
+
+[dependencies]
+kamadak-exif.workspace = true
+quick-xml.workspace = true
+image.workspace = true
+tiff.workspace = true
+dirs.workspace = true
diff --git a/crates/gipfel-core/examples/genjpg.rs b/crates/gipfel-core/examples/genjpg.rs
new file mode 100644
index 0000000..ae12b94
--- /dev/null
+++ b/crates/gipfel-core/examples/genjpg.rs
@@ -0,0 +1,24 @@
+// creates a test JPEG with a gipfel comment: genjpg <out.jpg>
+use gipfel_core::metadata::ImageMetaData;
+
+fn main() {
+    let out = std::env::args().nth(1).unwrap();
+    let (w, h) = (1600u32, 900u32);
+    let img = image::DynamicImage::new_rgb8(w, h).grayscale();
+    img.save(&out).unwrap();
+
+    let mut md = ImageMetaData::new();
+    md.longitude = 11.15;
+    md.latitude = 47.36;
+    md.height = 2100.0;
+    md.direction = 20.0;
+    md.pitch = 0.0;
+    md.roll = 1.0;
+    md.focal_length_35mm = 35.0;
+    md.projection_type = 0;
+    md.k0 = 0.0;
+    md.k1 = 0.0;
+    md.x0 = 0.0;
+    md.save_image(&out, &out).unwrap();
+    println!("wrote {}", out);
+}
diff --git a/crates/gipfel-core/src/hill.rs b/crates/gipfel-core/src/hill.rs
new file mode 100644
index 0000000..a904948
--- /dev/null
+++ b/crates/gipfel-core/src/hill.rs
@@ -0,0 +1,224 @@
+//! Hill database: data structures, CSV loading, duplicate detection.
+//!
+//! Faithful port of gipfel's `Hill.cxx`.
+
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+
+pub const FLAG_DUPLIC: u32 = 1 << 0;
+pub const FLAG_KNOWN: u32 = 1 << 1;
+pub const FLAG_HIDDEN: u32 = 1 << 2;
+pub const FLAG_VISIBLE: u32 = 1 << 3;
+pub const FLAG_TRACK_POINT: u32 = 1 << 4;
+pub const FLAG_EXPORT: u32 = 1 << 5;
+
+pub const PI: f64 = std::f64::consts::PI;
+pub const DEG2RAD: f64 = PI / 180.0;
+
+#[derive(Clone, Debug)]
+pub struct Hill {
+    pub name: String,
+    /// latitude, radians
+    pub phi: f64,
+    /// longitude, radians
+    pub lam: f64,
+    /// height, meters
+    pub height: f64,
+    /// azimuth from viewpoint, radians
+    pub alph: f64,
+    /// peak angle over horizon, radians
+    pub a_elev: f64,
+    /// distance from viewpoint, fraction of earth radius
+    pub dist: f64,
+    pub x: f64,
+    pub y: f64,
+    pub label_x: f64,
+    pub label_y: f64,
+    pub flags: u32,
+}
+
+impl Hill {
+    pub fn new(name: &str, phi: f64, lam: f64, height: f64) -> Self {
+        Hill {
+            name: name.to_string(),
+            phi,
+            lam,
+            height,
+            alph: 0.0,
+            a_elev: 0.0,
+            dist: 0.0,
+            x: 0.0,
+            y: 0.0,
+            label_x: 0.0,
+            label_y: 0.0,
+            flags: 0,
+        }
+    }
+
+    pub fn is_track_point(&self) -> bool {
+        self.flags & FLAG_TRACK_POINT != 0
+    }
+}
+
+/// `atof()` semantics: parse the longest numeric prefix, 0.0 on failure.
+fn atof(s: &str) -> f64 {
+    let s = s.trim();
+    if s.is_empty() {
+        return 0.0;
+    }
+    if let Ok(v) = s.parse::<f64>() {
+        return v;
+    }
+    for i in (1..s.len()).rev() {
+        if let Ok(v) = s[..i].parse::<f64>() {
+            return v;
+        }
+    }
+    0.0
+}
+
+/// Load a hill database. Two line formats are accepted:
+/// - `SHORT,NAME,DESC,LAT,LON,HEIGHT` (6 fields)
+/// - `LAT,LON,HEIGHT` (3 fields, track point)
+pub fn load(path: &str) -> std::io::Result<Vec<Hill>> {
+    let file = File::open(path)?;
+    let mut hills = Vec::new();
+
+    // the database is Latin-1; decode to Unicode code points
+    for line in BufReader::new(file).split(b'\n') {
+        let raw = line?;
+        let line: String = raw.iter().map(|b| *b as char).collect();
+        // strsep() semantics: split into at most 10 fields, keeping empties
+        let vals: Vec<&str> = line.split(',').take(10).collect();
+        let n = vals.len();
+
+        if n == 6 {
+            // standard format including name and description
+            let phi = atof(vals[3]) * DEG2RAD;
+            let lam = atof(vals[4]) * DEG2RAD;
+            let height = atof(vals[5]);
+            hills.push(Hill::new(vals[1], phi, lam, height));
+        } else if n == 3 {
+            // track point format
+            let phi = atof(vals[0]) * DEG2RAD;
+            let lam = atof(vals[1]) * DEG2RAD;
+            let height = atof(vals[2]);
+            let mut h = Hill::new("", phi, lam, height);
+            // NOTE: original does not set TRACK_POINT here
+            h.flags |= 0;
+            hills.push(h);
+        }
+    }
+
+    Ok(hills)
+}
+
+/// Mark hills that are (near-)exact duplicates of an earlier hill.
+/// Faithful port of `Hills::mark_duplicates`.
+///
+/// Unlike the C original (which sorts the pointer array in place), this
+/// must NOT reorder `hills`: in this port, hill indices are stable handles
+/// (track lists, known-hill sets, visible lists). Sorting an index
+/// permutation instead keeps the semantics identical while preserving
+/// insertion order.
+pub fn mark_duplicates(hills: &mut [Hill], dist: f64) {
+    // descending phi (mirrors the C qsort comparator order)
+    let mut order: Vec<usize> = (0..hills.len()).collect();
+    order.sort_by(|&a, &b| {
+        hills[b]
+            .phi
+            .partial_cmp(&hills[a].phi)
+            .unwrap_or(std::cmp::Ordering::Equal)
+    });
+
+    let len = hills.len();
+    for pos in 0..len {
+        let i = order[pos];
+        if hills[i].is_track_point() {
+            continue;
+        }
+
+        let mut j = pos + 1;
+        while j < len && (hills[order[j]].phi - hills[i].phi).abs() <= dist {
+            let jj = order[j];
+            if hills[jj].flags & FLAG_DUPLIC == 0
+                && (hills[jj].lam - hills[i].lam).abs() <= dist
+                && (hills[jj].height - hills[i].height).abs() <= 50.0
+            {
+                hills[jj].flags |= FLAG_DUPLIC;
+            }
+            j += 1;
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn atof_semantics() {
+        assert_eq!(atof("12.5"), 12.5);
+        assert_eq!(atof(""), 0.0);
+        assert_eq!(atof("abc"), 0.0);
+        assert_eq!(atof("12abc"), 12.0);
+        assert_eq!(atof(" -3.5x"), -3.5);
+    }
+
+    #[test]
+    fn load_formats() {
+        let dir = std::env::temp_dir().join("gipfel-core-test");
+        std::fs::create_dir_all(&dir).unwrap();
+        let path = dir.join("hills.csv");
+        std::fs::write(
+            &path,
+            "# comment line\n\
+             ZSP,Zugspitze,Germany,47.421,10.9855,2962\n\
+             FOO,Foo Peak,,47.5,11.0,1000\n\
+             47.6,11.1,1234\n\
+             bad,line\n",
+        )
+        .unwrap();
+
+        let hills = load(path.to_str().unwrap()).unwrap();
+        assert_eq!(hills.len(), 3);
+        assert_eq!(hills[0].name, "Zugspitze");
+        assert!((hills[0].phi - 47.421 * DEG2RAD).abs() < 1e-12);
+        assert_eq!(hills[0].height, 2962.0);
+        assert_eq!(hills[2].name, "");
+        let _ = std::fs::remove_file(&path);
+    }
+
+    #[test]
+    fn duplicates() {
+        let mut hills = vec![
+            Hill::new("A", 47.0, 11.0, 1000.0),
+            Hill::new("A2", 47.000001, 11.000001, 1010.0), // dup of A
+            Hill::new("B", 47.5, 11.5, 1000.0),
+            Hill::new("C", 47.0, 11.0, 1200.0), // >50m diff -> not dup
+        ];
+        mark_duplicates(&mut hills, 0.00001);
+        assert_eq!(hills.iter().filter(|h| h.flags & FLAG_DUPLIC != 0).count(), 1);
+    }
+
+    #[test]
+    fn mark_duplicates_preserves_order() {
+        // indices are stable handles in the port: mark_duplicates must not
+        // reorder the vec (regression: an in-place phi sort broke the app's
+        // track index range when add_hills ran it on the full hill list)
+        let mut hills = vec![
+            Hill::new("south", 46.0, 11.0, 1000.0),
+            Hill::new("north", 48.0, 11.0, 1000.0),
+            Hill::new("mid", 47.0, 11.0, 1000.0),
+            Hill::new("mid-dup", 47.000001, 11.0, 1010.0),
+        ];
+        mark_duplicates(&mut hills, 0.00001);
+        assert_eq!(hills[0].name, "south");
+        assert_eq!(hills[1].name, "north");
+        assert_eq!(hills[2].name, "mid");
+        assert_eq!(hills[3].name, "mid-dup");
+        // descending phi visits mid-dup first, so 'mid' is the one marked
+        assert_eq!(hills[2].flags & FLAG_DUPLIC, FLAG_DUPLIC);
+        assert_eq!(hills[3].flags & FLAG_DUPLIC, 0);
+    }
+}
diff --git a/crates/gipfel-core/src/lib.rs b/crates/gipfel-core/src/lib.rs
new file mode 100644
index 0000000..2e2fac9
--- /dev/null
+++ b/crates/gipfel-core/src/lib.rs
@@ -0,0 +1,23 @@
+//! gipfel-core: headless port of the gipfel computational core.
+//!
+//! Modules:
+//! - [`hill`]: hill database (CSV load, duplicate marking)
+//! - [`panorama`]: viewpoint, geodesy, refraction, occlusion, visibility
+//! - [`projection`]: rectilinear/cylindrical projections with symbolic
+//!   derivatives generated by maxima (see `codegen/`)
+//! - [`lsq`]: Levenberg-Marquardt fit of the view parameters (system GSL)
+//! - [`metadata`]: `gipfel:` JPEG comment + EXIF read/write
+
+pub mod hill;
+pub mod lsq;
+pub mod metadata;
+pub mod panorama;
+pub mod profile;
+pub mod projection;
+pub mod stitch;
+pub mod track;
+
+pub use hill::Hill;
+pub use metadata::ImageMetaData;
+pub use panorama::Panorama;
+pub use projection::{Projection, ProjectionType, ViewParams};
diff --git a/crates/gipfel-core/src/lsq.rs b/crates/gipfel-core/src/lsq.rs
new file mode 100644
index 0000000..6a9d6c7
--- /dev/null
+++ b/crates/gipfel-core/src/lsq.rs
@@ -0,0 +1,392 @@
+//! Non-linear least squares fit of the view parameters.
+//!
+//! Faithful port of `ProjectionLSQ.cxx`. The C++ original uses GSL's
+//! `gsl_multifit_fdfsolver_lmsder`; this is a self-contained Levenberg-
+//! Marquardt with the same scaled damping (`JᵀJ + λ·diag(JᵀJ)`) and the
+//! analytic Jacobian produced by the maxima-generated derivatives. For the
+//! well-conditioned gipfel fit (residuals reach zero at the optimum) it
+//! converges to the same minimum; the golden tests verify agreement with the
+//! C/GSL output.
+
+use crate::hill::Hill;
+use crate::projection::{Projection, ViewParams};
+
+const MAX_ITER: usize = 200;
+
+/// Number of fitted parameters at a given level.
+fn np_for_level(level: usize) -> usize {
+    match level {
+        0 => 2,
+        1 => 4,
+        _ => 7,
+    }
+}
+
+struct FitData<'a> {
+    proj: &'a dyn Projection,
+    hills: &'a [Hill],
+    known: &'a [usize],
+    level: usize,
+    /// parameters at solver start; entries above `level` keep these values
+    parms0: ViewParams,
+}
+
+impl FitData<'_> {
+    fn params_from_x(&self, x: &[f64]) -> ViewParams {
+        // C starts from the initial params and only overwrites the entries
+        // that are actually fitted at this level.
+        let mut p = self.parms0;
+        p.a_center = x[0];
+        p.a_pitch = x[1];
+        if self.level > 0 {
+            p.a_roll = x[2];
+            p.scale = x[3];
+        }
+        if self.level > 1 {
+            p.k0 = x[4];
+            p.k1 = x[5];
+            p.x0 = x[6];
+        }
+        p
+    }
+
+    fn args(&self, p: &ViewParams, i: usize) -> crate::projection::ProjArgs {
+        let m = &self.hills[self.known[i]];
+        crate::projection::ProjArgs::from_params(p, m.alph, m.a_elev)
+    }
+
+    /// Residual vector: 2 entries (x,y) per known hill, length `2*known.len()`.
+    fn residuals(&self, x: &[f64], f: &mut [f64]) {
+        let p = self.params_from_x(x);
+        for i in 0..self.known.len() {
+            let m = &self.hills[self.known[i]];
+            let a = self.args(&p, i);
+            f[2 * i] = self.proj.mac_x(a) - m.x;
+            f[2 * i + 1] = self.proj.mac_y(a) - m.y;
+        }
+    }
+
+    /// Jacobian, row-major `m`×`np` (`m = 2*known.len()`).
+    fn jacobian(&self, x: &[f64], j: &mut [f64]) {
+        let p = self.params_from_x(x);
+        let np = np_for_level(self.level);
+        let row = |r: usize, c: usize, v: f64, j: &mut [f64]| j[r * np + c] = v;
+        for i in 0..self.known.len() {
+            let a = self.args(&p, i);
+
+            row(2 * i, 0, self.proj.mac_x_dc_view(a), j);
+            row(2 * i + 1, 0, self.proj.mac_y_dc_view(a), j);
+            row(2 * i, 1, self.proj.mac_x_dc_pitch(a), j);
+            row(2 * i + 1, 1, self.proj.mac_y_dc_pitch(a), j);
+
+            if np > 2 {
+                row(2 * i, 2, self.proj.mac_x_dc_roll(a), j);
+                row(2 * i + 1, 2, self.proj.mac_y_dc_roll(a), j);
+                row(2 * i, 3, self.proj.mac_x_dscale(a), j);
+                row(2 * i + 1, 3, self.proj.mac_y_dscale(a), j);
+            }
+
+            if np > 4 {
+                row(2 * i, 4, self.proj.mac_x_dk0(a), j);
+                row(2 * i + 1, 4, self.proj.mac_y_dk0(a), j);
+                row(2 * i, 5, self.proj.mac_x_dk1(a), j);
+                row(2 * i + 1, 5, self.proj.mac_y_dk1(a), j);
+                row(2 * i, 6, self.proj.mac_x_dx0(a), j);
+                row(2 * i + 1, 6, self.proj.mac_y_dx0(a), j);
+            }
+        }
+    }
+}
+
+fn dot(a: &[f64], b: &[f64]) -> f64 {
+    a.iter().zip(b).map(|(x, y)| x * y).sum()
+}
+
+/// Solve `A·δ = b` in place (A row-major `n`×`n`, overwritten) by Gaussian
+/// elimination with partial pivoting. Returns `None` if the matrix is
+/// (numerically) singular.
+fn gauss_solve(a: &mut [f64], b: &[f64], n: usize) -> Option<Vec<f64>> {
+    let mut x = b.to_vec();
+    for col in 0..n {
+        // partial pivot
+        let mut piv = col;
+        let mut maxv = a[col * n + col].abs();
+        for r in (col + 1)..n {
+            let v = a[r * n + col].abs();
+            if v > maxv {
+                maxv = v;
+                piv = r;
+            }
+        }
+        if maxv < 1e-300 {
+            return None;
+        }
+        if piv != col {
+            for c in 0..n {
+                a.swap(col * n + c, piv * n + c);
+            }
+            x.swap(col, piv);
+        }
+        let diag = a[col * n + col];
+        for r in (col + 1)..n {
+            let factor = a[r * n + col] / diag;
+            a[r * n + col] = 0.0;
+            for c in (col + 1)..n {
+                a[r * n + c] -= factor * a[col * n + c];
+            }
+            x[r] -= factor * x[col];
+        }
+    }
+    for r in (0..n).rev() {
+        let mut s = x[r];
+        for c in (r + 1)..n {
+            s -= a[r * n + c] * x[c];
+        }
+        x[r] = s / a[r * n + r];
+    }
+    Some(x)
+}
+
+/// One Levenberg-Marquardt fit at a single parameter level. On return, `x`
+/// holds the fitted parameters (length `np`).
+fn lm(data: &FitData, x: &mut [f64], np: usize) {
+    let m = 2 * data.known.len();
+    let mut f = vec![0.0f64; m];
+    let mut fnew = vec![0.0f64; m];
+    let mut jac = vec![0.0f64; m * np];
+    let mut a = vec![0.0f64; np * np];
+    let mut ad = vec![0.0f64; np * np];
+    let mut g = vec![0.0f64; np];
+    let mut neg_g = vec![0.0f64; np];
+    let mut xnew = vec![0.0f64; np];
+
+    data.residuals(x, &mut f);
+    let mut cost = 0.5 * dot(&f, &f);
+    let mut lambda: f64 = 1e-3;
+
+    for _ in 0..MAX_ITER {
+        if !cost.is_finite() {
+            break;
+        }
+        data.jacobian(x, &mut jac);
+
+        // A = JᵀJ (symmetric), g = Jᵀf
+        for i in 0..np {
+            for k in i..np {
+                let mut s = 0.0;
+                for r in 0..m {
+                    s += jac[r * np + i] * jac[r * np + k];
+                }
+                a[i * np + k] = s;
+                a[k * np + i] = s;
+            }
+            let mut s = 0.0;
+            for r in 0..m {
+                s += jac[r * np + i] * f[r];
+            }
+            g[i] = s;
+        }
+
+        // Solve the damped normal equations (JᵀJ + λ·diag(JᵀJ))·δ = -Jᵀf,
+        // inflating λ until the system is non-singular.
+        let mut delta: Option<Vec<f64>> = None;
+        for _ in 0..50 {
+            ad.copy_from_slice(&a);
+            for i in 0..np {
+                let d = a[i * np + i];
+                ad[i * np + i] = if d > 1e-300 { d * (1.0 + lambda) } else { lambda.max(1e-300) };
+            }
+            for i in 0..np {
+                neg_g[i] = -g[i];
+            }
+            let mut ad_try = ad.clone();
+            if let Some(d) = gauss_solve(&mut ad_try, &neg_g, np) {
+                delta = Some(d);
+                break;
+            }
+            lambda *= 10.0;
+        }
+        let delta = match delta {
+            Some(d) => d,
+            None => break,
+        };
+
+        for i in 0..np {
+            xnew[i] = x[i] + delta[i];
+        }
+        data.residuals(&xnew, &mut fnew);
+        let cost_new = 0.5 * dot(&fnew, &fnew);
+
+        if cost_new < cost {
+            let improvement = cost - cost_new;
+            x.copy_from_slice(&xnew);
+            std::mem::swap(&mut f, &mut fnew);
+            cost = cost_new;
+            lambda = (lambda * 0.1).max(1e-12);
+            // Converged when the cost can no longer improve meaningfully.
+            if improvement <= 1e-18 * cost {
+                break;
+            }
+        } else {
+            lambda *= 10.0;
+            if lambda > 1e16 {
+                break;
+            }
+        }
+    }
+}
+
+/// Run the Levenberg-Marquardt fit for one parameter level and write the
+/// result back into `parms`. Mirrors `ProjectionLSQ::lsq`.
+fn lsq(proj: &dyn Projection, hills: &[Hill], known: &[usize], parms: &mut ViewParams, level: usize) {
+    let np = np_for_level(level);
+    let data = FitData {
+        proj,
+        hills,
+        known,
+        level,
+        parms0: *parms,
+    };
+
+    let mut x = vec![
+        parms.a_center,
+        parms.a_pitch,
+        parms.a_roll,
+        parms.scale,
+        parms.k0,
+        parms.k1,
+        parms.x0,
+    ];
+    x.truncate(np);
+
+    lm(&data, &mut x, np);
+
+    parms.a_center = x[0];
+    parms.a_pitch = x[1];
+    if level > 0 {
+        parms.a_roll = x[2];
+        parms.scale = x[3];
+    }
+    if level > 1 {
+        parms.k0 = x[4];
+        parms.k1 = x[5];
+        parms.x0 = x[6];
+    }
+}
+
+/// Fit the view parameters to the known hills.
+/// Mirrors `ProjectionLSQ::comp_params`. `known` indexes into `hills`.
+/// With `fit_distortion == false` the lens distortion parameters
+/// (k0/k1/x0) are held at their current values and only the viewpoint
+/// parameters are fitted, even for 4+ known hills.
+pub fn comp_params(
+    proj: &dyn Projection,
+    hills: &[Hill],
+    known: &[usize],
+    parms: &mut ViewParams,
+    fit_distortion: bool,
+) -> Result<(), String> {
+    let n = known.len();
+    if n < 1 {
+        return Err("Please position at least 1 hill".to_string());
+    }
+
+    let m1 = &hills[known[0]];
+    let mut new_parms = *parms;
+    new_parms.a_center = m1.alph;
+    new_parms.a_pitch = 0.0;
+
+    if n > 1 {
+        let m2 = &hills[known[1]];
+        let scale_tmp = (m2.x - m1.x).abs() / (m2.alph - m1.alph).abs();
+        if scale_tmp.is_nan() || scale_tmp < 50.0 {
+            return Err(format!("Could not determine initial scale value ({scale_tmp})"));
+        }
+        new_parms.scale = scale_tmp;
+        new_parms.a_roll = 0.0;
+    }
+
+    if n > 3 && fit_distortion {
+        new_parms.k0 = 0.0;
+        new_parms.k1 = 0.0;
+        new_parms.x0 = 0.0;
+        eprintln!("Performing calibration");
+    }
+
+    let level = if n == 1 { 0 } else { 1 };
+    lsq(proj, hills, known, &mut new_parms, level);
+    if n >= 4 && fit_distortion {
+        lsq(proj, hills, known, &mut new_parms, 2);
+    }
+
+    if new_parms.scale.is_nan() || new_parms.scale < 50.0 {
+        return Err("Could not determine reasonable view parameters".to_string());
+    }
+
+    *parms = new_parms;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::hill::Hill;
+    use crate::projection::{Projection, ProjectionType, ViewParams, projection_from_type};
+
+    /// Five observed hills projected with known parameters (incl. distortion).
+    fn fixture() -> (Box<dyn Projection>, Vec<Hill>, Vec<usize>, ViewParams) {
+        let proj = projection_from_type(ProjectionType::Rectilinear);
+        let truth = ViewParams {
+            a_center: 0.3,
+            scale: 2000.0,
+            a_pitch: 0.05,
+            a_roll: 0.0,
+            k0: -0.0012,
+            k1: 2e-5,
+            x0: 0.0,
+        };
+        let mut hills = Vec::new();
+        let mut known = Vec::new();
+        for i in 0..5 {
+            let alph = 0.15 + i as f64 * 0.07;
+            let elev = 0.02 + i as f64 * 0.015;
+            let (x, y) = proj.get_coordinates(alph, elev, &truth);
+            let mut h = Hill::new(&format!("h{i}"), 0.0, 0.0, 1000.0);
+            h.alph = alph;
+            h.a_elev = elev;
+            h.x = x;
+            h.y = y;
+            hills.push(h);
+            known.push(i);
+        }
+        (proj, hills, known, truth)
+    }
+
+    #[test]
+    fn locked_distortion_stays_untouched() {
+        let (proj, hills, known, truth) = fixture();
+        let mut p = truth;
+        p.a_center -= 0.01;
+        p.scale *= 1.02;
+        comp_params(&*proj, &hills, &known, &mut p, false).unwrap();
+        // 5 known hills, but the distortion params must not move
+        assert_eq!(p.k0, truth.k0);
+        assert_eq!(p.k1, truth.k1);
+        assert_eq!(p.x0, truth.x0);
+        // the viewpoint params did fit
+        assert!((p.a_center - truth.a_center).abs() < 1e-6);
+    }
+
+    #[test]
+    fn unlocked_distortion_fit_recovers() {
+        let (proj, hills, known, truth) = fixture();
+        let mut p = truth;
+        p.k0 = 0.0;
+        p.k1 = 0.0;
+        p.a_center -= 0.01;
+        p.scale *= 1.02;
+        comp_params(&*proj, &hills, &known, &mut p, true).unwrap();
+        assert!((p.k0 - truth.k0).abs() < 1e-5, "k0={}", p.k0);
+        assert!((p.k1 - truth.k1).abs() < 1e-7, "k1={}", p.k1);
+    }
+}
diff --git a/crates/gipfel-core/src/metadata.rs b/crates/gipfel-core/src/metadata.rs
new file mode 100644
index 0000000..e2a888f
--- /dev/null
+++ b/crates/gipfel-core/src/metadata.rs
@@ -0,0 +1,697 @@
+//! Image metadata: the `gipfel:` JPEG comment (read/write, byte-compatible
+//! with the C version) plus EXIF fallback (GPS position, focal length).
+//!
+//! Faithful port of gipfel's `ImageMetaData.cxx`.
+
+use std::fs::File;
+use std::io::{BufReader, Write};
+
+use exif::{In, Tag, Value};
+
+pub const NAN: f64 = f64::NAN;
+
+#[derive(Clone, Debug)]
+pub struct ImageMetaData {
+    pub manufacturer: Option<String>,
+    pub model: Option<String>,
+    pub longitude: f64,
+    pub latitude: f64,
+    pub height: f64,
+    pub direction: f64,
+    /// camera pitch, degrees (written as the "nick" key in the gipfel:
+    /// comment for backwards compatibility with the C original)
+    pub pitch: f64,
+    /// camera roll, degrees (written as the "tilt" key for compatibility)
+    pub roll: f64,
+    pub k0: f64,
+    pub k1: f64,
+    pub x0: f64,
+    pub focal_length: f64,
+    pub focal_length_35mm: f64,
+    pub projection_type: i32,
+}
+
+impl Default for ImageMetaData {
+    fn default() -> Self {
+        ImageMetaData {
+            manufacturer: None,
+            model: None,
+            longitude: NAN,
+            latitude: NAN,
+            height: NAN,
+            direction: NAN,
+            pitch: NAN,
+            roll: NAN,
+            k0: NAN,
+            k1: NAN,
+            x0: NAN,
+            focal_length: NAN,
+            focal_length_35mm: NAN,
+            projection_type: 0,
+        }
+    }
+}
+
+impl ImageMetaData {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Read JPEG comment first, then fill remaining gaps from EXIF.
+    pub fn load_image(&mut self, path: &str) {
+        *self = ImageMetaData::new();
+        if let Some(com) = read_jpeg_comment(path) {
+            self.parse_gipfel_comment(&com);
+        }
+        self.load_image_exif(path);
+    }
+
+    /// Write the gipfel comment into a copy of `in_img`, saved as `out_img`.
+    /// Writes atomically via a temp file, like the C original.
+    pub fn save_image(&self, in_img: &str, out_img: &str) -> std::io::Result<()> {
+        let comment = self.format_comment();
+        let tmp = format!("{}.tmp", out_img);
+        write_jpeg_comment(in_img, &tmp, comment.as_bytes())?;
+        std::fs::rename(&tmp, out_img)?;
+        Ok(())
+    }
+
+    pub fn format_comment(&self) -> String {
+        format!(
+            "gipfel: longitude {}, latitude {}, height {}, direction {}, nick {}, tilt {}, focal_length_35mm {}, projection type {}, k0 {}, k1 {}, x0 {}",
+            fmt_f64(self.longitude),
+            fmt_f64(self.latitude),
+            fmt_f64(self.height),
+            fmt_f64(self.direction),
+            fmt_f64(self.pitch),
+            fmt_f64(self.roll),
+            fmt_f64(self.focal_length_35mm),
+            self.projection_type,
+            fmt_f64(self.k0),
+            fmt_f64(self.k1),
+            fmt_f64(self.x0),
+        )
+    }
+
+    /// sscanf(gipfel_format_scan, ...) equivalent; returns true when at
+    /// least 8 fields were matched (the C requirement).
+    pub fn parse_gipfel_comment(&mut self, com: &[u8]) -> bool {
+        let s = String::from_utf8_lossy(com);
+        let mut sc = Scanner { s: s.as_ref() };
+
+        if !sc.lit("gipfel: longitude ") {
+            return false;
+        }
+        let Some(lo) = sc.f64() else { return false };
+        if !sc.lit(", latitude ") { return false; }
+        let la = sc.f64();
+        if la.is_none() { return false; }
+        if !sc.lit(", height ") { return false; }
+        let he = sc.f64();
+        if he.is_none() { return false; }
+        if !sc.lit(", direction ") { return false; }
+        let dir = sc.f64();
+        if dir.is_none() { return false; }
+        if !sc.lit(", nick ") { return false; }
+        let pit = sc.f64();
+        if pit.is_none() { return false; }
+        if !sc.lit(", tilt ") { return false; }
+        let rol = sc.f64();
+        if rol.is_none() { return false; }
+        if !sc.lit(", focal_length_35mm ") { return false; }
+        let fr = sc.f64();
+        if fr.is_none() { return false; }
+        if !sc.lit(", projection type ") { return false; }
+        let pt = sc.i32();
+
+        // 8 matches required: through projection type
+        let Some(pt) = pt else { return false };
+
+        self.longitude = lo;
+        self.latitude = la.unwrap();
+        self.height = he.unwrap();
+        self.direction = dir.unwrap();
+        self.pitch = pit.unwrap();
+        self.roll = rol.unwrap();
+        self.focal_length_35mm = fr.unwrap();
+        self.projection_type = pt;
+
+        // n >= 10: k0 and k1 were matched; x0 defaults to 0.0 when only 10
+        if let Some(k0) = sc.f64_after(", k0 ") {
+            if let Some(k1) = sc.f64_after(", k1 ") {
+                self.k0 = k0;
+                self.k1 = k1;
+                self.x0 = sc.f64_after(", x0 ").unwrap_or(0.0);
+            }
+        }
+
+        true
+    }
+
+    fn load_image_exif(&mut self, path: &str) {
+        let Ok(file) = File::open(path) else { return };
+        let mut reader = BufReader::new(file);
+        let Ok(exif) = exif::Reader::new().read_from_container(&mut reader) else {
+            return;
+        };
+
+        if self.manufacturer.is_none() {
+            if let Some(f) = exif.get_field(Tag::Make, In::PRIMARY) {
+                let s = field_string(f);
+                if !s.is_empty() {
+                    self.manufacturer = Some(s);
+                }
+            }
+        }
+        if self.model.is_none() {
+            if let Some(f) = exif.get_field(Tag::Model, In::PRIMARY) {
+                let s = field_string(f);
+                if !s.is_empty() {
+                    self.model = Some(s);
+                }
+            }
+        }
+
+        if self.focal_length.is_nan() {
+            exif_set_value(self, &exif, Tag::FocalLength, In::PRIMARY, |md, v| md.focal_length = v);
+        }
+        if self.focal_length_35mm.is_nan() {
+            exif_set_value(
+                self,
+                &exif,
+                Tag::FocalLengthIn35mmFilm,
+                In::PRIMARY,
+                |md, v| md.focal_length_35mm = v,
+            );
+        }
+        if self.longitude.is_nan() {
+            exif_set_coordinate(self, &exif, Tag::GPSLongitude, In::PRIMARY, |md, v| md.longitude = v);
+            if !self.longitude.is_nan() && exif_ref_is(&exif, Tag::GPSLongitudeRef, "W") {
+                self.longitude = -self.longitude;
+            }
+        }
+        if self.latitude.is_nan() {
+            exif_set_coordinate(self, &exif, Tag::GPSLatitude, In::PRIMARY, |md, v| md.latitude = v);
+            if !self.latitude.is_nan() && exif_ref_is(&exif, Tag::GPSLatitudeRef, "S") {
+                self.latitude = -self.latitude;
+            }
+        }
+        if self.height.is_nan() {
+            exif_set_value(self, &exif, Tag::GPSAltitude, In::PRIMARY, |md, v| md.height = v);
+            // GPSAltitudeRef: 0 = above sea level, 1 = below
+            if !self.height.is_nan() {
+                if let Some(f) = exif.get_field(Tag::GPSAltitudeRef, In::PRIMARY) {
+                    if let Value::Byte(b) = &f.value {
+                        if b.first() == Some(&1) {
+                            self.height = -self.height;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// True if an EXIF ASCII reference tag (GPSLatitudeRef etc.) equals `val`.
+fn exif_ref_is(exif: &exif::Exif, tag: Tag, val: &str) -> bool {
+    exif.get_field(tag, In::PRIMARY)
+        .and_then(|f| match &f.value {
+            Value::Ascii(a) => a.first().map(|v| String::from_utf8_lossy(v).trim() == val),
+            _ => None,
+        })
+        .unwrap_or(false)
+}
+
+fn fmt_f64(v: f64) -> String {
+    if v.is_nan() {
+        // C printf("%f", nan) prints "nan"; keep it parseable by both
+        "nan".to_string()
+    } else {
+        format!("{:.6}", v)
+    }
+}
+
+fn field_string(f: &exif::Field) -> String {
+    let join = |v: &[String]| v.join(" ");
+    match &f.value {
+        Value::Ascii(a) => a
+            .first()
+            .map(|v| String::from_utf8_lossy(v).trim().to_string())
+            .unwrap_or_default(),
+        Value::Rational(r) => join(r.iter().map(|v| v.to_string()).collect::<Vec<_>>().as_slice()),
+        Value::Short(v) => join(v.iter().map(|v| v.to_string()).collect::<Vec<_>>().as_slice()),
+        Value::Long(v) => join(v.iter().map(|v| v.to_string()).collect::<Vec<_>>().as_slice()),
+        Value::SShort(v) => join(v.iter().map(|v| v.to_string()).collect::<Vec<_>>().as_slice()),
+        Value::SLong(v) => join(v.iter().map(|v| v.to_string()).collect::<Vec<_>>().as_slice()),
+        _ => String::new(),
+    }
+}
+
+/// exifSetValue: assign when the tag exists and its value is >= 0.
+fn exif_set_value<F>(md: &mut ImageMetaData, exif: &exif::Exif, tag: Tag, inp: In, set: F)
+where
+    F: FnOnce(&mut ImageMetaData, f64),
+{
+    if let Some(f) = exif.get_field(tag, inp) {
+        if let Some(v) = field_tofloat(f, 0) {
+            if v >= 0.0 {
+                set(md, v);
+            }
+        }
+    }
+}
+
+/// exifSetCoordinate: degrees + minutes/60 + seconds/3600, each component
+/// only used when >= 0 (faithful to the C original, incl. ignoring N/S refs).
+fn exif_set_coordinate<F>(md: &mut ImageMetaData, exif: &exif::Exif, tag: Tag, inp: In, set: F)
+where
+    F: FnOnce(&mut ImageMetaData, f64),
+{
+    let Some(f) = exif.get_field(tag, inp) else {
+        return;
+    };
+
+    let mut dest: Option<f64> = None;
+    for i in 0..3 {
+        if let Some(v) = field_tofloat(f, i) {
+            if v >= 0.0 {
+                dest = Some(match i {
+                    0 => v,
+                    1 => dest.unwrap_or(0.0) + v / 60.0,
+                    _ => dest.unwrap_or(0.0) + v / 3600.0,
+                });
+            }
+        }
+    }
+    if let Some(v) = dest {
+        set(md, v);
+    }
+}
+
+fn field_tofloat(f: &exif::Field, idx: usize) -> Option<f64> {
+    match &f.value {
+        Value::Rational(r) => r.get(idx).map(|v| v.num as f64 / v.denom as f64),
+        Value::Short(v) => v.get(idx).map(|v| *v as f64),
+        Value::Long(v) => v.get(idx).map(|v| *v as f64),
+        Value::SShort(v) => v.get(idx).map(|v| *v as f64),
+        Value::SLong(v) => v.get(idx).map(|v| *v as f64),
+        _ => None,
+    }
+}
+
+// ---------------------------------------------------------------------------
+// strtod-like scanner for the sscanf format
+// ---------------------------------------------------------------------------
+
+struct Scanner<'a> {
+    s: &'a str,
+}
+
+impl Scanner<'_> {
+    fn skip_ws(&mut self) {
+        self.s = self.s.trim_start();
+    }
+
+    fn lit(&mut self, lit: &str) -> bool {
+        if self.s.starts_with(lit) {
+            self.s = &self.s[lit.len()..];
+            true
+        } else {
+            false
+        }
+    }
+
+    /// %lf: skip whitespace, parse the longest numeric prefix.
+    fn f64(&mut self) -> Option<f64> {
+        self.skip_ws();
+        for i in (1..=self.s.len()).rev() {
+            if let Ok(v) = self.s[..i].parse::<f64>() {
+                self.s = &self.s[i..];
+                return Some(v);
+            }
+        }
+        None
+    }
+
+    fn f64_after(&mut self, lit: &str) -> Option<f64> {
+        if self.lit(lit) {
+            self.f64()
+        } else {
+            None
+        }
+    }
+
+    /// %d
+    fn i32(&mut self) -> Option<i32> {
+        self.skip_ws();
+        for i in (1..=self.s.len()).rev() {
+            if let Ok(v) = self.s[..i].parse::<i32>() {
+                self.s = &self.s[i..];
+                return Some(v);
+            }
+        }
+        None
+    }
+}
+
+// ---------------------------------------------------------------------------
+// JPEG COM segment reading / writing
+// ---------------------------------------------------------------------------
+
+fn marker_len_ok(marker: u8) -> bool {
+    // standalone markers without length field
+    marker == 0x01 || (0xD0..=0xD9).contains(&marker)
+}
+
+/// Return the payload of the first COM segment before SOS, if any.
+pub fn read_jpeg_comment(path: &str) -> Option<Vec<u8>> {
+    let bytes = std::fs::read(path).ok()?;
+    if bytes.len() < 2 || bytes[0] != 0xFF || bytes[1] != 0xD8 {
+        return None;
+    }
+
+    let mut i = 2;
+    while i + 1 < bytes.len() {
+        if bytes[i] != 0xFF {
+            return None;
+        }
+        let marker = bytes[i + 1];
+        if marker == 0xFF {
+            i += 1;
+            continue;
+        }
+        if marker == 0xDA || marker == 0xD9 {
+            return None;
+        }
+        if marker_len_ok(marker) {
+            i += 2;
+            continue;
+        }
+        if i + 4 > bytes.len() {
+            return None;
+        }
+        let len = (u16::from_be_bytes([bytes[i + 2], bytes[i + 3]]) as usize).checked_add(2)?;
+        if i + len > bytes.len() {
+            return None;
+        }
+        if marker == 0xFE {
+            return Some(bytes[i + 4..i + 2 + len - 2].to_vec());
+        }
+        i += len;
+    }
+    None
+}
+
+/// Copy `in_img` to `out_img`, dropping all COM segments and inserting a
+/// fresh COM segment right after SOI.
+pub fn write_jpeg_comment(in_img: &str, out_img: &str, comment: &[u8]) -> std::io::Result<()> {
+    let bytes = std::fs::read(in_img)?;
+    if bytes.len() < 2 || bytes[0] != 0xFF || bytes[1] != 0xD8 {
+        return Err(std::io::Error::new(std::io::ErrorKind::InvalidInput, "not a JPEG file"));
+    }
+    if comment.len() + 2 > 0xFFFF {
+        return Err(std::io::Error::new(std::io::ErrorKind::InvalidInput, "comment too long"));
+    }
+
+    let mut out: Vec<u8> = Vec::with_capacity(bytes.len() + comment.len() + 4);
+    out.extend_from_slice(&bytes[..2]); // SOI
+
+    // Copy the SOI-adjacent header region (APPn/COM/DPI/etc.), dropping COM
+    // segments, and insert our fresh COM after the last APPn segment:
+    // that is where exiv2 (and thus the C gipfel) expects it.
+    let mut i = 2;
+    let mut insert_at = out.len();
+    let mut copy_rest_from = bytes.len();
+    while i + 1 < bytes.len() {
+        if bytes[i] != 0xFF {
+            break;
+        }
+        let marker = bytes[i + 1];
+        if marker == 0xFF {
+            i += 1;
+            continue;
+        }
+        if marker == 0xDA || marker == 0xD9 {
+            copy_rest_from = i;
+            break;
+        }
+        if marker_len_ok(marker) {
+            out.push(0xFF);
+            out.push(marker);
+            i += 2;
+            continue;
+        }
+        if i + 4 > bytes.len() {
+            break;
+        }
+        let len = match u16::from_be_bytes([bytes[i + 2], bytes[i + 3]]) {
+            l => (l as usize).checked_add(2).unwrap_or(usize::MAX),
+        };
+        if len < 2 || i + len > bytes.len() {
+            break;
+        }
+        if marker != 0xFE {
+            out.extend_from_slice(&bytes[i..i + len]);
+            if (0xE0..=0xEF).contains(&marker) {
+                insert_at = out.len();
+            }
+        }
+        i += len;
+    }
+    copy_rest_from = copy_rest_from.min(i.max(2));
+
+    let mut com: Vec<u8> = Vec::with_capacity(comment.len() + 4);
+    com.push(0xFF);
+    com.push(0xFE);
+    com.extend_from_slice(&((comment.len() + 2) as u16).to_be_bytes());
+    com.extend_from_slice(comment);
+    out.splice(insert_at..insert_at, com);
+
+    out.extend_from_slice(&bytes[copy_rest_from..]);
+
+    let mut f = File::create(out_img)?;
+    f.write_all(&out)?;
+    f.flush()
+}
+
+/// Read raw image dimensions (width, height) of a JPEG.
+pub fn image_dimensions(path: &str) -> Option<(u32, u32)> {
+    image::image_dimensions(path).ok()
+}
+
+/// Apply image metadata to a panorama like `GipfelWidget::load_image` does.
+/// Returns false when the gipfel info is incomplete (C: `have_gipfel_info`).
+pub fn apply_image_metadata(
+    pan: &mut crate::panorama::Panorama,
+    md: &ImageMetaData,
+    img_w: u32,
+    img_h: u32,
+) -> bool {
+    use crate::projection::ProjectionType;
+
+    let mut have_info = true;
+
+    pan.set_view_long(md.longitude);
+    pan.set_view_lat(md.latitude);
+    pan.set_view_height(md.height);
+
+    pan.set_projection(match md.projection_type {
+        1 => ProjectionType::Cylindrical,
+        _ => ProjectionType::Rectilinear,
+    });
+
+    if md.direction.is_nan() {
+        pan.set_center_angle(0.0);
+        have_info = false;
+    } else {
+        pan.set_center_angle(md.direction);
+    }
+
+    if md.pitch.is_nan() {
+        pan.set_pitch_angle(0.0);
+        have_info = false;
+    } else {
+        pan.set_pitch_angle(md.pitch);
+    }
+
+    if md.roll.is_nan() {
+        pan.set_roll_angle(0.0);
+        have_info = false;
+    } else {
+        pan.set_roll_angle(md.roll);
+    }
+
+    // set_focal_length_35mm: scale = fl * max(w, h) / 35
+    let w = img_w.max(img_h);
+    if md.focal_length_35mm.is_nan() || md.focal_length_35mm == 0.0 {
+        pan.set_scale(35.0 * w as f64 / 35.0);
+        have_info = false;
+    } else {
+        pan.set_scale(md.focal_length_35mm * w as f64 / 35.0);
+    }
+
+    // distortion parameters, C ordering:
+    // 1. gipfel data in JPEG comment
+    // 2. matching distortion profile (camera + focal length)
+    // 3. 0.0, 0.0, 0.0
+    let (mut k0, mut k1, mut x0) = (md.k0, md.k1, md.x0);
+    if k0.is_nan() {
+        if let Some(p) = md
+            .manufacturer
+            .as_deref()
+            .zip(md.model.as_deref())
+            .and_then(|(mfr, model)| crate::profile::profile_name(mfr, model, md.focal_length))
+            .and_then(|name| crate::profile::load(&name).ok())
+        {
+            k0 = p.k0;
+            k1 = p.k1;
+            x0 = p.x0;
+        }
+    }
+    if k0.is_nan() {
+        k0 = 0.0;
+    }
+    if k1.is_nan() {
+        k1 = 0.0;
+    }
+    if x0.is_nan() {
+        x0 = 0.0;
+    }
+    pan.set_distortion_params(k0, k1, x0);
+
+    have_info
+}
+
+/// The profile name auto-matched from this image's camera and focal length
+/// (C `get_distortion_profile_name`). Suggested whenever the camera is
+/// known — [`apply_image_metadata`] only *applies* it when the JPEG
+/// comment carries no distortion params.
+pub fn distortion_profile_name(md: &ImageMetaData) -> Option<String> {
+    md.manufacturer
+        .as_deref()
+        .zip(md.model.as_deref())
+        .and_then(|(mfr, model)| crate::profile::profile_name(mfr, model, md.focal_length))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn jpeg_comment_write_read() {
+        let dir = std::env::temp_dir().join("gipfel-core-mdtest");
+        std::fs::create_dir_all(&dir).unwrap();
+        let img = dir.join("t.jpg");
+        let out = dir.join("o.jpg");
+
+        image::DynamicImage::new_rgb8(64, 48)
+            .grayscale()
+            .save(&img)
+            .unwrap();
+
+        let comment = b"gipfel: longitude 1.000000, latitude 2.000000, height 3.000000, direction 4.000000, nick 5.000000, tilt 6.000000, focal_length_35mm 7.000000, projection type 0, k0 0.000000, k1 0.000000, x0 0.000000";
+        write_jpeg_comment(img.to_str().unwrap(), out.to_str().unwrap(), comment).unwrap();
+
+        // no COM before, one after
+        assert!(read_jpeg_comment(img.to_str().unwrap()).is_none());
+        assert_eq!(read_jpeg_comment(out.to_str().unwrap()).unwrap(), comment);
+
+        // rewriting replaces the existing comment
+        let out2 = dir.join("o2.jpg");
+        write_jpeg_comment(out.to_str().unwrap(), out2.to_str().unwrap(), b"short").unwrap();
+        assert_eq!(read_jpeg_comment(out2.to_str().unwrap()).unwrap(), b"short");
+
+        // image still decodes
+        assert!(image::image_dimensions(out.to_str().unwrap()).is_ok());
+
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+
+    #[test]
+    fn distortion_precedence_and_legacy_import() {
+        use crate::panorama::Panorama;
+        use crate::profile;
+
+        let dir = std::env::temp_dir().join(format!("gipfel-prec-{}", std::process::id()));
+        let _ = std::fs::remove_dir_all(&dir);
+        let data = dir.join("data");
+        let home = dir.join("home");
+        std::fs::create_dir_all(&data).unwrap();
+
+        let old = (std::env::var("HOME").ok(), std::env::var("XDG_DATA_HOME").ok());
+        std::env::set_var("HOME", &home);
+        std::env::set_var("XDG_DATA_HOME", &data);
+
+        // legacy FLTK prefs file (C version's location and format)
+        let legacy = home
+            .join(".fltk")
+            .join("Johannes.HofmannATgmx.de")
+            .join("gipfel")
+            .join("DistortionProfiles.prefs");
+        std::fs::create_dir_all(legacy.parent().unwrap()).unwrap();
+        std::fs::write(
+            &legacy,
+            "; FLTK preferences file format 1.0\n; vendor: Johannes.HofmannATgmx.de\n\
+             ; application: gipfel/DistortionProfiles\n\n[.]\n\n\n\
+             [./Canon_EOS_5D_50.00_mm]\n\nk0:-0.01\nk1:0.001\nx0:3\n",
+        )
+        .unwrap();
+
+        // first access imports into the XDG data dir
+        assert!(!profile::prefs_path().exists());
+        let all = profile::list();
+        assert!(all.iter().any(|(n, p)| n == "Canon_EOS_5D_50.00_mm" && p.k0 == -0.01));
+        assert!(profile::prefs_path().starts_with(&data));
+        assert!(profile::prefs_path().exists());
+
+        let mut md = ImageMetaData::new();
+        md.manufacturer = Some("Canon".into());
+        md.model = Some("EOS_5D".into());
+        md.focal_length = 50.0;
+        let mut pan = Panorama::new();
+
+        // 1. comment wins when present
+        md.k0 = -0.9;
+        md.k1 = 0.0;
+        md.x0 = 0.0;
+        apply_image_metadata(&mut pan, &md, 1000, 800);
+        assert!((pan.parms.k0 + 0.9).abs() < 1e-12, "comment should win");
+
+        // 2. profile used when comment absent
+        md.k0 = f64::NAN;
+        md.k1 = f64::NAN;
+        md.x0 = f64::NAN;
+        apply_image_metadata(&mut pan, &md, 1000, 800);
+        assert!(
+            (pan.parms.k0 + 0.01).abs() < 1e-12,
+            "profile should apply: k0={}",
+            pan.parms.k0
+        );
+        // name is suggested regardless of the comment (C save dialog)
+        assert_eq!(
+            distortion_profile_name(&md).as_deref(),
+            Some("Canon_EOS_5D_50.00_mm")
+        );
+        md.k0 = 0.0;
+        assert_eq!(
+            distortion_profile_name(&md).as_deref(),
+            Some("Canon_EOS_5D_50.00_mm")
+        );
+
+        // 3. zero when neither
+        md.k0 = f64::NAN;
+        md.manufacturer = None;
+        apply_image_metadata(&mut pan, &md, 1000, 800);
+        assert_eq!(pan.parms.k0, 0.0);
+
+        match old.0 {
+            Some(h) => std::env::set_var("HOME", h),
+            None => std::env::remove_var("HOME"),
+        }
+        match old.1 {
+            Some(h) => std::env::set_var("XDG_DATA_HOME", h),
+            None => std::env::remove_var("XDG_DATA_HOME"),
+        }
+        let _ = std::fs::remove_dir_all(&dir);
+    }
+}
diff --git a/crates/gipfel-core/src/panorama.rs b/crates/gipfel-core/src/panorama.rs
new file mode 100644
index 0000000..9e27251
--- /dev/null
+++ b/crates/gipfel-core/src/panorama.rs
@@ -0,0 +1,502 @@
+//! Panorama: viewpoint, hill visibility (occlusion, refraction) and the
+//! link between geographic coordinates and image coordinates.
+//!
+//! Faithful port of gipfel's `Panorama.cxx`.
+
+use crate::hill::{Hill, DEG2RAD, PI};
+use crate::projection::{projection_from_type, Projection, ProjectionType, ViewParams};
+
+const EARTH_RADIUS: f64 = 6371000.785;
+
+pub struct Panorama {
+    pub hills: Vec<Hill>,
+    /// indices into `hills`, sorted by alpha descending (rebuilt by update_angles)
+    pub alpha_order: Vec<usize>,
+    /// indices into `hills`, sorted by alpha descending
+    pub close: Vec<usize>,
+    /// indices into `hills`
+    pub visible: Vec<usize>,
+
+    pub view_name: Option<String>,
+    /// latitude, radians
+    pub view_phi: f64,
+    /// longitude, radians
+    pub view_lam: f64,
+    /// meters
+    pub view_height: f64,
+
+    pub height_dist_ratio: f64,
+    pub hide_value: f64,
+    /// Additional visibility limit: maximum angular distance (radians) from
+    /// the image center. The app sets this to the angle the projection maps
+    /// to the image edge (the lens' actual field of view, including fitted
+    /// distortion), so that directions outside the photo — which a distortion
+    /// model can fold back into the image — neither get markers nor compass
+    /// ticks. 0 = no additional limit (only the projection's own limit).
+    pub max_view_angle: f64,
+
+    pub parms: ViewParams,
+    pub projection_type: ProjectionType,
+    proj: Box<dyn Projection>,
+}
+
+impl Default for Panorama {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Panorama {
+    pub fn new() -> Self {
+        Panorama {
+            hills: Vec::new(),
+            alpha_order: Vec::new(),
+            close: Vec::new(),
+            visible: Vec::new(),
+            view_name: None,
+            view_phi: 0.0,
+            view_lam: 0.0,
+            view_height: 0.0,
+            height_dist_ratio: 0.07,
+            hide_value: 1.2,
+            max_view_angle: 0.0,
+            parms: ViewParams::new(),
+            projection_type: ProjectionType::Rectilinear,
+            proj: projection_from_type(ProjectionType::Rectilinear),
+        }
+    }
+
+    pub fn load_data(&mut self, path: &str) -> std::io::Result<()> {
+        let mut hills = crate::hill::load(path)?;
+        crate::hill::mark_duplicates(&mut hills, 0.00001);
+        self.hills = hills;
+        self.update_angles();
+        Ok(())
+    }
+
+    pub fn add_hills(&mut self, extra: &[Hill]) {
+        self.hills.extend_from_slice(extra);
+        crate::hill::mark_duplicates(&mut self.hills, 0.00001);
+        self.update_angles();
+    }
+
+    pub fn remove_hills(&mut self, flags: u32) {
+        self.hills.retain(|m| m.flags & flags == 0);
+        // indices shifted; rebuild all derived lists
+        self.alpha_order.clear();
+        self.close.clear();
+        self.visible.clear();
+    }
+
+    pub fn set_viewpoint(&mut self, idx: Option<usize>) {
+        let Some(idx) = idx else { return };
+        let m = &self.hills[idx];
+        self.view_phi = m.phi;
+        self.view_lam = m.lam;
+        self.view_height = m.height;
+        self.view_name = Some(m.name.clone());
+        self.update_angles();
+    }
+
+    /// Fit view parameters to the known hills (indices into `self.hills`).
+    /// `fit_distortion` enables the 7-parameter fit (k0/k1/x0) for 4+ hills;
+    /// otherwise the distortion params stay locked at their current values.
+    pub fn comp_params(&mut self, known: &[usize], fit_distortion: bool) -> Result<(), String> {
+        let ret = crate::lsq::comp_params(&*self.proj, &self.hills, known, &mut self.parms, fit_distortion);
+        if ret.is_ok() {
+            self.update_visible_mountains(Some(known));
+        }
+        ret
+    }
+
+    /// Like [`Panorama::comp_params`] but the observed hills are an external
+    /// slice (used by the golden fit tests, mirroring the C harness).
+    pub fn comp_params_with(&mut self, hills: &[Hill], known: &[usize], fit_distortion: bool) -> Result<(), String> {
+        let ret = crate::lsq::comp_params(&*self.proj, hills, known, &mut self.parms, fit_distortion);
+        if ret.is_ok() {
+            self.update_visible_mountains(None);
+        }
+        ret
+    }
+
+    pub fn set_center_angle(&mut self, deg: f64) {
+        self.parms.a_center = deg * DEG2RAD;
+        self.update_visible_mountains(None);
+    }
+
+    pub fn set_pitch_angle(&mut self, deg: f64) {
+        self.parms.a_pitch = deg * DEG2RAD;
+        self.update_coordinates(None);
+    }
+
+    pub fn set_roll_angle(&mut self, deg: f64) {
+        self.parms.a_roll = deg * DEG2RAD;
+        self.update_coordinates(None);
+    }
+
+    pub fn set_scale(&mut self, s: f64) {
+        self.parms.scale = s;
+        self.update_coordinates(None);
+    }
+
+    pub fn set_distortion_params(&mut self, k0: f64, k1: f64, x0: f64) {
+        self.parms.k0 = k0;
+        self.parms.k1 = k1;
+        self.parms.x0 = x0;
+        self.update_coordinates(None);
+    }
+
+    pub fn set_height_dist_ratio(&mut self, r: f64) {
+        self.height_dist_ratio = r;
+        self.update_close_mountains();
+    }
+
+    pub fn set_view_long(&mut self, deg: f64) {
+        self.view_lam = deg * DEG2RAD;
+        self.update_angles();
+    }
+
+    pub fn set_view_lat(&mut self, deg: f64) {
+        self.view_phi = deg * DEG2RAD;
+        self.update_angles();
+    }
+
+    pub fn set_view_height(&mut self, v: f64) {
+        self.view_height = v;
+        self.update_angles();
+    }
+
+    pub fn set_projection(&mut self, t: ProjectionType) {
+        self.projection_type = t;
+        self.proj = projection_from_type(t);
+        self.update_angles();
+    }
+
+    pub fn get_center_angle(&self) -> f64 {
+        self.parms.a_center / DEG2RAD
+    }
+    pub fn get_pitch_angle(&self) -> f64 {
+        self.parms.a_pitch / DEG2RAD
+    }
+    pub fn get_roll_angle(&self) -> f64 {
+        self.parms.a_roll / DEG2RAD
+    }
+    pub fn get_scale(&self) -> f64 {
+        self.parms.scale
+    }
+    pub fn get_view_long(&self) -> f64 {
+        self.view_lam / DEG2RAD
+    }
+    pub fn get_view_lat(&self) -> f64 {
+        self.view_phi / DEG2RAD
+    }
+    pub fn get_view_height(&self) -> f64 {
+        self.view_height
+    }
+
+    /// Last hill whose name matches exactly (C keeps the last match).
+    pub fn get_pos(&self, name: &str) -> Option<usize> {
+        let mut ret = None;
+        for (i, m) in self.hills.iter().enumerate() {
+            if m.name == name {
+                ret = Some(i);
+            }
+        }
+        ret
+    }
+
+    pub fn update_angles(&mut self) {
+        for i in 0..self.hills.len() {
+            let (phi, lam) = (self.hills[i].phi, self.hills[i].lam);
+            let d = self.distance(phi, lam);
+            self.hills[i].dist = d;
+            if phi != self.view_phi || lam != self.view_lam {
+                let a = self.alpha(i);
+                self.hills[i].alph = a;
+            }
+        }
+
+        // keep `hills` in insertion order (indices stay stable) and maintain a
+        // separate alpha-descending order, mirroring the C pointer-array sort
+        let mut idx: Vec<usize> = (0..self.hills.len()).collect();
+        idx.sort_by(|&a, &b| {
+            self.hills[b]
+                .alph
+                .partial_cmp(&self.hills[a].alph)
+                .unwrap_or(std::cmp::Ordering::Equal)
+        });
+        self.alpha_order = idx;
+
+        self.update_close_mountains();
+    }
+
+    /// Mark hills that are hidden behind a nearer, taller neighbour.
+    /// Faithful port including the original's `fabs(m->alph - n->alph > pi/2)`
+    /// oddity (comparison inside fabs, i.e. skip when m.alph - n.alph > pi/2).
+    pub fn mark_hidden(&mut self, hills: &[usize]) {
+        for i in 0..hills.len() {
+            let m = hills[i];
+            self.hills[m].flags &= !crate::hill::FLAG_HIDDEN;
+
+            if self.hills[m].flags & crate::hill::FLAG_DUPLIC != 0 {
+                continue;
+            }
+
+            for j in 0..hills.len() {
+                let n = hills[j];
+                if self.hills[n].flags & crate::hill::FLAG_DUPLIC != 0
+                    || self.hills[n].flags & crate::hill::FLAG_TRACK_POINT != 0
+                {
+                    continue;
+                }
+                if n == m || self.hills[m].alph - self.hills[n].alph > PI / 2.0 {
+                    continue;
+                }
+                if self.hills[m].dist < self.hills[n].dist
+                    || self.hills[m].a_elev > self.hills[n].a_elev
+                {
+                    continue;
+                }
+
+                let h = (self.hills[n].a_elev - self.hills[m].a_elev)
+                    / (self.hills[m].alph - self.hills[n].alph).abs();
+                if h.is_infinite() || h > self.hide_value {
+                    self.hills[m].flags |= crate::hill::FLAG_HIDDEN;
+                }
+            }
+        }
+    }
+
+    pub fn update_close_mountains(&mut self) {
+        self.close.clear();
+
+        let order = self.alpha_order.clone();
+        for &i in &order {
+            let m = &self.hills[i];
+            if m.flags & crate::hill::FLAG_TRACK_POINT != 0
+                || ((m.phi != self.view_phi || m.lam != self.view_lam)
+                    && (m.height / (m.dist * EARTH_RADIUS) > self.height_dist_ratio))
+            {
+                let elev = self.elevation(i);
+                self.hills[i].a_elev = elev;
+                self.close.push(i);
+            }
+        }
+
+        let close = self.close.clone();
+        self.mark_hidden(&close);
+        self.update_visible_mountains(None);
+    }
+
+    pub fn update_visible_mountains(&mut self, excluded: Option<&[usize]>) {
+        self.visible.clear();
+
+        for k in 0..self.close.len() {
+            let i = self.close[k];
+            if self.is_visible(self.hills[i].alph) {
+                self.visible.push(i);
+                self.hills[i].flags |= crate::hill::FLAG_VISIBLE;
+            } else {
+                self.hills[i].flags &= !crate::hill::FLAG_VISIBLE;
+            }
+        }
+
+        let owned;
+        let excl: Option<&[usize]> = match excluded {
+            Some(e) => {
+                owned = e.to_vec();
+                Some(&owned)
+            }
+            None => None,
+        };
+        self.update_coordinates(excl);
+    }
+
+    pub fn update_coordinates(&mut self, excluded: Option<&[usize]>) {
+        for k in 0..self.visible.len() {
+            let i = self.visible[k];
+            if let Some(e) = excluded {
+                if e.contains(&i) {
+                    continue;
+                }
+            }
+            let (alph, elev) = (self.hills[i].alph, self.hills[i].a_elev);
+            let (x, y) = self.proj.get_coordinates(alph, elev, &self.parms);
+            self.hills[i].x = x;
+            self.hills[i].y = y;
+        }
+    }
+
+    /// angular distance (fraction of earth radius) viewpoint -> (phi, lam)
+    pub fn distance(&self, phi: f64, lam: f64) -> f64 {
+        let d_lam = self.view_lam - lam;
+
+        let t1 = (phi.cos() * d_lam.sin()).powi(2);
+        let t2 = (self.view_phi.cos() * phi.sin()
+            - self.view_phi.sin() * phi.cos() * d_lam.cos())
+        .powi(2);
+
+        (t1 + t2).sqrt().atan2(
+            self.view_phi.sin() * phi.sin() + self.view_phi.cos() * phi.cos() * d_lam.cos(),
+        )
+    }
+
+    pub fn alpha(&self, idx: usize) -> f64 {
+        let m = &self.hills[idx];
+        let sin_alph = (m.lam - self.view_lam).sin() * m.phi.cos() / m.dist.sin();
+        let cos_alph =
+            (m.phi.sin() - self.view_phi.sin() * m.dist.cos()) / (self.view_phi.cos() * m.dist.sin());
+
+        (sin_alph.atan2(cos_alph) + 2.0 * PI) % (2.0 * PI)
+    }
+
+    /// approximation of refraction effect as described by Tom Chester at
+    /// <http://tchester.org/sgm/analysis/peaks/refraction.html>
+    pub fn refraction(&self, idx: usize) -> f64 {
+        let (alpha, t0) = (6.5, 10.0);
+
+        let a = 2.9e-4 * (-self.view_height / 10000.0).exp() / (1.0 + 2.9 * t0 / 760.0);
+        let b = 2.9 * alpha / (760.0 * (1.0 + 2.9 * t0 / 760.0));
+        let c = a * (b - 1.0 / 10.0);
+
+        c * self.get_real_distance(idx) / (2000.0 * (1.0 + a))
+    }
+
+    pub fn elevation(&self, idx: usize) -> f64 {
+        let m = &self.hills[idx];
+        let theta = self.refraction(idx);
+
+        let b = m.height + self.get_earth_radius(m.phi);
+        let c = self.view_height + self.get_earth_radius(self.view_phi);
+
+        ((m.dist.cos() * b - c) / (m.dist.sin() * b)).atan() - theta
+    }
+
+    /// local distance to center of WGS84 ellipsoid
+    pub fn get_earth_radius(&self, phi: f64) -> f64 {
+        let a = 6378137.000f64;
+        let b = 6356752.315f64;
+        let ata = phi.tan();
+
+        a * (ata.powi(2) + 1.0).powf(1.0 / 2.0)
+            * b.abs()
+            * (b.powi(2) + a.powi(2) * ata.powi(2)).powf(-1.0 / 2.0)
+    }
+
+    /// real (line-of-sight) distance in meters
+    pub fn get_real_distance(&self, idx: usize) -> f64 {
+        let m = &self.hills[idx];
+        let a = self.view_height + self.get_earth_radius(self.view_phi);
+        let b = m.height + self.get_earth_radius(m.phi);
+        let gam = m.dist;
+
+        (a.powi(2) + b.powi(2) - 2.0 * a * b * gam.cos()).sqrt()
+    }
+
+    pub fn is_visible(&self, alph: f64) -> bool {
+        let mut center_dist = (alph - self.parms.a_center).abs();
+        if center_dist > PI {
+            center_dist = 2.0 * PI - center_dist;
+        }
+        if center_dist >= self.proj.get_view_angle() {
+            return false;
+        }
+        self.max_view_angle <= 0.0 || center_dist < self.max_view_angle
+    }
+
+    /// Forward-project (azimuth, elevation) to image-centered pixel coords.
+    /// `None` when the direction is not visible or the projection is
+    /// undefined there (mirrors C `Panorama::get_coordinates` returning 1,
+    /// plus the NaN guard of C `ScanImage::get_pixel_nearest`).
+    pub fn project_point(&self, alph: f64, elev: f64) -> Option<(f64, f64)> {
+        if !self.is_visible(alph) {
+            return None;
+        }
+        let (x, y) = self.proj.get_coordinates(alph, elev, &self.parms);
+        if x.is_nan() || y.is_nan() {
+            return None;
+        }
+        Some((x, y))
+    }
+
+    /// Parameter-only snapshot (no hill data) for resampling: same viewpoint
+    /// and projection parameters, but without the UI's lens-FOV visibility
+    /// limit (the stitch output range defines the FOV itself).
+    pub fn params_snapshot(&self) -> Panorama {
+        let mut p = Panorama::new();
+        p.projection_type = self.projection_type;
+        p.proj = projection_from_type(self.projection_type);
+        p.parms = self.parms;
+        p.view_phi = self.view_phi;
+        p.view_lam = self.view_lam;
+        p.view_height = self.view_height;
+        p
+    }
+
+    pub fn get_coordinates(&self, alph: f64, elev: f64) -> Option<(f64, f64)> {
+        if self.is_visible(alph) {
+            Some(self.proj.get_coordinates(alph, elev, &self.parms))
+        } else {
+            None
+        }
+    }
+
+    /// Export rows for the visible hills, mirroring the C `export_hills`
+    /// output loop: `name\theight\tx\ty\tdistance` with image-center origin.
+    /// When `require_export` is set, only hills with `FLAG_EXPORT` are listed.
+    pub fn export_hill_rows(&self, img_w: i64, img_h: i64, require_export: bool) -> Vec<String> {
+        let mut rows = Vec::new();
+        for &i in &self.visible {
+            let m = &self.hills[i];
+            if m.flags & crate::hill::FLAG_DUPLIC != 0
+                || m.flags & crate::hill::FLAG_HIDDEN != 0
+                || (require_export && m.flags & crate::hill::FLAG_EXPORT == 0)
+            {
+                continue;
+            }
+
+            let x = m.x.round_ties_even() as i64 + img_w / 2;
+            let y = m.y.round_ties_even() as i64 + img_h / 2;
+            if x < 0 || x > img_w || y < 0 || y > img_h {
+                continue;
+            }
+
+            rows.push(format!(
+                "{}\t{}\t{}\t{}\t{}",
+                m.name,
+                m.height.round_ties_even() as i64,
+                x,
+                y,
+                self.get_real_distance(i).round_ties_even() as i64
+            ));
+        }
+        rows
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn max_view_angle_limits_visibility() {
+        let mut pan = Panorama::new();
+        pan.set_center_angle(0.0);
+        let a30 = 30f64.to_radians();
+        let a70 = 70f64.to_radians();
+
+        // rectilinear default limit is +-60 deg
+        assert!(pan.is_visible(a30));
+        assert!(!pan.is_visible(a70));
+
+        // a tighter lens FOV (say +-35 deg) hides the 40 deg direction that
+        // the projection's own +-60 deg limit would allow
+        pan.max_view_angle = 35f64.to_radians();
+        assert!(pan.is_visible(a30));
+        assert!(!pan.is_visible(40f64.to_radians()));
+
+        // a wider limit never overrides the projection's own bound
+        pan.max_view_angle = 80f64.to_radians();
+        assert!(!pan.is_visible(a70));
+    }
+}
diff --git a/crates/gipfel-core/src/profile.rs b/crates/gipfel-core/src/profile.rs
new file mode 100644
index 0000000..e8bda68
--- /dev/null
+++ b/crates/gipfel-core/src/profile.rs
@@ -0,0 +1,362 @@
+//! Lens distortion profiles.
+//!
+//! Profiles live in the standard per-user data directory
+//! (`$XDG_DATA_HOME/gipfel/distortion-profiles.prefs`, i.e.
+//! `~/.local/share/gipfel/…`). The file format is the FLTK preferences
+//! format used by the C version (`[./name]` groups, `key:value` entries,
+//! `%g` values), so the legacy file
+//! `~/.fltk/Johannes.HofmannATgmx.de/gipfel/DistortionProfiles.prefs`
+//! imports automatically into the new location on first use.
+//!
+//! File layout (as written by FLTK):
+//! ```text
+//! ; FLTK preferences file format 1.0
+//! ; vendor: Johannes.HofmannATgmx.de
+//! ; application: gipfel/DistortionProfiles
+//!
+//! [.]
+//!
+//! [./Canon_EOS_5D_50.00_mm]
+//!
+//! k0:-0.00123
+//! k1:2.5e-05
+//! x0:0.5
+//! ```
+
+use std::path::{Path, PathBuf};
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Profile {
+    pub k0: f64,
+    pub k1: f64,
+    pub x0: f64,
+}
+
+#[derive(Debug)]
+pub enum Error {
+    NotFound,
+    Exists,
+    BadName,
+    Io(std::io::Error),
+}
+
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Error::NotFound => write!(f, "profile not found"),
+            Error::Exists => write!(f, "profile already exists"),
+            Error::BadName => write!(f, "invalid profile name"),
+            Error::Io(e) => write!(f, "{e}"),
+        }
+    }
+}
+
+/// The profile store in the standard data directory
+/// (`$XDG_DATA_HOME/gipfel/distortion-profiles.prefs`).
+pub fn prefs_path() -> PathBuf {
+    dirs::data_dir()
+        .unwrap_or_else(|| PathBuf::from(std::env::var("HOME").unwrap_or_default()))
+        .join("gipfel")
+        .join("distortion-profiles.prefs")
+}
+
+/// Legacy FLTK preferences file used by the C version.
+fn fltk_prefs_path() -> PathBuf {
+    let home = std::env::var("HOME").unwrap_or_default();
+    Path::new(&home)
+        .join(".fltk")
+        .join("Johannes.HofmannATgmx.de")
+        .join("gipfel")
+        .join("DistortionProfiles.prefs")
+}
+
+/// Path to the profile store; imports legacy FLTK profiles on first use.
+fn ensure_store() -> PathBuf {
+    let path = prefs_path();
+    if !path.exists() {
+        let legacy = fltk_prefs_path();
+        if legacy.exists() {
+            if let Some(dir) = path.parent() {
+                let _ = std::fs::create_dir_all(dir);
+            }
+            // same format, so a copy suffices
+            let _ = std::fs::copy(&legacy, &path);
+        }
+    }
+    path
+}
+
+/// C `get_distortion_profile_name`: `"%s_%s_%.2f_mm"`. `None` when the
+/// camera is unknown or the focal length is unusable (C would build a name
+/// containing "nan" that can never match a stored profile).
+pub fn profile_name(manufacturer: &str, model: &str, focal_mm: f64) -> Option<String> {
+    if manufacturer.is_empty() || model.is_empty() || !focal_mm.is_finite() || focal_mm <= 0.0 {
+        return None;
+    }
+    let name = format!("{manufacturer}_{model}_{focal_mm:.2}_mm");
+    sanitize_name(&name).ok().map(|_| name)
+}
+
+/// Reject names that would break the prefs file structure (FLTK group paths
+/// use '/' as separator; control chars/newlines corrupt the file).
+pub fn sanitize_name(name: &str) -> Result<(), Error> {
+    if name.trim().is_empty() || name.len() > 255 {
+        return Err(Error::BadName);
+    }
+    if name
+        .chars()
+        .any(|c| c == '/' || c == '\\' || c.is_control())
+    {
+        return Err(Error::BadName);
+    }
+    Ok(())
+}
+
+/// Parse a prefs file into ordered (name, profile) pairs. Tolerant:
+/// comments (`;`), the root group `[.]`, blank lines and unknown keys are
+/// ignored; values are parsed with Rust's `f64` (superset of C `%g`).
+fn parse(text: &str) -> Vec<(String, Profile)> {
+    let mut out: Vec<(String, Profile)> = Vec::new();
+    let mut cur: Option<usize> = None;
+    for line in text.lines() {
+        let line = line.trim_end();
+        if line.is_empty() || line.starts_with(';') {
+            continue;
+        }
+        if let Some(group) = line.strip_prefix('[').and_then(|s| s.strip_suffix(']')) {
+            cur = match group.strip_prefix("./") {
+                Some(name) => {
+                    out.push((
+                        name.to_string(),
+                        Profile {
+                            k0: f64::NAN,
+                            k1: f64::NAN,
+                            x0: f64::NAN,
+                        },
+                    ));
+                    Some(out.len() - 1)
+                }
+                None => None, // "[.]" root group
+            };
+            continue;
+        }
+        let Some(idx) = cur else { continue };
+        if let Some((key, val)) = line.split_once(':') {
+            let Ok(v) = val.trim().parse::<f64>() else {
+                continue;
+            };
+            let p = &mut out[idx].1;
+            match key.trim() {
+                "k0" => p.k0 = v,
+                "k1" => p.k1 = v,
+                "x0" => p.x0 = v,
+                _ => {}
+            }
+        }
+    }
+    out.retain(|(_, p)| p.k0.is_finite() && p.k1.is_finite() && p.x0.is_finite());
+    out
+}
+
+/// Serialize in FLTK's layout so the C version can read our file.
+fn serialize(profiles: &[(String, Profile)]) -> String {
+    let mut s = String::from(
+        "; FLTK preferences file format 1.0\n\
+         ; vendor: Johannes.HofmannATgmx.de\n\
+         ; application: gipfel/DistortionProfiles\n\
+         \n\
+         [.]\n\
+         \n",
+    );
+    for (name, p) in profiles {
+        s.push_str(&format!(
+            "\n[./{name}]\n\nk0:{}\nk1:{}\nx0:{}\n",
+            fmt_g(p.k0),
+            fmt_g(p.k1),
+            fmt_g(p.x0)
+        ));
+    }
+    s
+}
+
+/// Closest Rust equivalent of C `%g`: scientific notation for magnitudes
+/// outside [1e-4, 1e15), exponent zero-padded to two digits ("2.5e-05").
+/// Unlike C we keep the shortest round-trip mantissa (more precise; the
+/// FLTK reader uses strtod and reads either fine).
+fn fmt_g(v: f64) -> String {
+    if v != 0.0 && (v.abs() < 1e-4 || v.abs() >= 1e15) {
+        if let Some((mant, exp)) = format!("{v:e}").split_once('e') {
+            let neg = exp.starts_with('-');
+            let digits = exp.trim_start_matches(['-', '+']);
+            let digits = if digits.len() < 2 { format!("0{digits}") } else { digits.to_string() };
+            let sign = if neg { '-' } else { '+' };
+            return format!("{mant}e{sign}{digits}");
+        }
+    }
+    if v == v.trunc() && v.abs() < 1e16 {
+        format!("{}", v as i64)
+    } else {
+        format!("{v}")
+    }
+}
+
+fn read_all(path: &Path) -> Result<Vec<(String, Profile)>, Error> {
+    match std::fs::read_to_string(path) {
+        Ok(text) => Ok(parse(&text)),
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(Vec::new()),
+        Err(e) => Err(Error::Io(e)),
+    }
+}
+
+fn write_all(path: &Path, profiles: &[(String, Profile)]) -> Result<(), Error> {
+    if let Some(dir) = path.parent() {
+        std::fs::create_dir_all(dir).map_err(Error::Io)?;
+    }
+    // atomic: temp file + rename
+    let tmp = path.with_extension("prefs.tmp");
+    std::fs::write(&tmp, serialize(profiles)).map_err(Error::Io)?;
+    std::fs::rename(&tmp, path).map_err(Error::Io)?;
+    Ok(())
+}
+
+/// Load a profile by exact name from the default store.
+pub fn load(name: &str) -> Result<Profile, Error> {
+    load_from(&ensure_store(), name)
+}
+
+pub fn load_from(path: &Path, name: &str) -> Result<Profile, Error> {
+    read_all(path)?
+        .into_iter()
+        .find(|(n, _)| n == name)
+        .map(|(_, p)| p)
+        .ok_or(Error::NotFound)
+}
+
+/// Save a profile. With `force == false` an existing profile of that name is
+/// not overwritten (C `save_distortion_params(name, force)`).
+pub fn save(name: &str, profile: Profile, force: bool) -> Result<(), Error> {
+    save_to(&ensure_store(), name, profile, force)
+}
+
+pub fn save_to(path: &Path, name: &str, profile: Profile, force: bool) -> Result<(), Error> {
+    sanitize_name(name)?;
+    let mut all = read_all(path)?;
+    if let Some(pos) = all.iter().position(|(n, _)| n == name) {
+        if !force {
+            return Err(Error::Exists);
+        }
+        all[pos].1 = profile;
+    } else {
+        all.push((name.to_string(), profile));
+    }
+    write_all(path, &all)
+}
+
+/// All profiles in the default store, in file order.
+pub fn list() -> Vec<(String, Profile)> {
+    read_all(&ensure_store()).unwrap_or_default()
+}
+
+pub fn list_from(path: &Path) -> Vec<(String, Profile)> {
+    read_all(path).unwrap_or_default()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Exact bytes as written by the C version (verified against FLTK 1.4).
+    const FLTK_FIXTURE: &str = "; FLTK preferences file format 1.0\n\
+         ; vendor: Johannes.HofmannATgmx.de\n\
+         ; application: gipfel/DistortionProfiles\n\
+         \n\
+         [.]\n\
+         \n\
+         \n\
+         [./Canon_EOS_5D_50.00_mm]\n\
+         \n\
+         k0:-0.00123\n\
+         k1:2.5e-05\n\
+         x0:0.5\n\
+         \n\
+         [./Nikon D850_35.00_mm]\n\
+         \n\
+         k0:0.01\n\
+         k1:0\n\
+         x0:0\n";
+
+    #[test]
+    fn parses_fltk_layout() {
+        let all = parse(FLTK_FIXTURE);
+        assert_eq!(all.len(), 2);
+        assert_eq!(all[0].0, "Canon_EOS_5D_50.00_mm");
+        assert_eq!(all[0].1.k0, -0.00123);
+        assert_eq!(all[0].1.k1, 2.5e-5);
+        assert_eq!(all[0].1.x0, 0.5);
+        assert_eq!(all[1].0, "Nikon D850_35.00_mm");
+        assert_eq!(all[1].1.k0, 0.01);
+        assert_eq!(all[1].1.k1, 0.0);
+    }
+
+    #[test]
+    fn serialize_replicates_fltk_layout() {
+        let all = parse(FLTK_FIXTURE);
+        assert_eq!(serialize(&all), FLTK_FIXTURE);
+    }
+
+    #[test]
+    fn fmt_g_matches_c_percent_g() {
+        assert_eq!(fmt_g(2.5e-5), "2.5e-05");
+        assert_eq!(fmt_g(-0.00123), "-0.00123");
+        assert_eq!(fmt_g(0.0001), "0.0001");
+        assert_eq!(fmt_g(1e15), "1e+15");
+        assert_eq!(fmt_g(0.0), "0");
+        assert_eq!(fmt_g(0.01), "0.01");
+    }
+
+    #[test]
+    fn profile_name_matches_c() {
+        assert_eq!(
+            profile_name("Canon", "EOS_5D", 50.0).as_deref(),
+            Some("Canon_EOS_5D_50.00_mm")
+        );
+        assert_eq!(
+            profile_name("Nikon", "D850", 34.666).as_deref(),
+            Some("Nikon_D850_34.67_mm")
+        );
+        assert!(profile_name("", "D850", 35.0).is_none());
+        assert!(profile_name("Canon", "D850", f64::NAN).is_none());
+        assert!(profile_name("Can/on", "D850", 35.0).is_none());
+    }
+
+    #[test]
+    fn roundtrip_and_overwrite() {
+        let dir = std::env::temp_dir().join(format!("gipfel-prof-{}", std::process::id()));
+        let path = dir.join("DistortionProfiles.prefs");
+        let _ = std::fs::remove_dir_all(&dir);
+
+        let p = Profile { k0: -0.001, k1: 2e-5, x0: 0.0 };
+        save_to(&path, "Cam_A_24.00_mm", p, false).unwrap();
+        // exists -> error without force
+        assert!(matches!(
+            save_to(&path, "Cam_A_24.00_mm", p, false),
+            Err(Error::Exists)
+        ));
+        save_to(&path, "Cam_B_50.00_mm", Profile { k0: 0.1, k1: 0.0, x0: 1.0 }, false).unwrap();
+        // overwrite first, keep second
+        let p2 = Profile { k0: -0.002, k1: 2e-5, x0: 0.0 };
+        save_to(&path, "Cam_A_24.00_mm", p2, true).unwrap();
+
+        let all = list_from(&path);
+        assert_eq!(all.len(), 2);
+        assert_eq!(all[0].1, p2);
+        assert_eq!(load_from(&path, "Cam_B_50.00_mm").unwrap().k0, 0.1);
+        assert!(matches!(load_from(&path, "nope"), Err(Error::NotFound)));
+
+        // bad names rejected
+        assert!(save_to(&path, "a/b", p, true).is_err());
+        assert!(save_to(&path, "with\nnewline", p, true).is_err());
+
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+}
diff --git a/crates/gipfel-core/src/projection/cylindrical.rs b/crates/gipfel-core/src/projection/cylindrical.rs
new file mode 100644
index 0000000..9adf79c
--- /dev/null
+++ b/crates/gipfel-core/src/projection/cylindrical.rs
@@ -0,0 +1,86 @@
+//! Cylindrical projection.
+
+mod funcs {
+    #![allow(non_snake_case, unused_parens, unused_variables, dead_code, clippy::all)]
+
+    // math shims: the maxima-generated code uses C-style calls
+    #[inline(always)]
+    fn sin(x: f64) -> f64 {
+        x.sin()
+    }
+    #[inline(always)]
+    fn cos(x: f64) -> f64 {
+        x.cos()
+    }
+    #[inline(always)]
+    fn tan(x: f64) -> f64 {
+        x.tan()
+    }
+    #[inline(always)]
+    fn sqrt(x: f64) -> f64 {
+        x.sqrt()
+    }
+    #[inline(always)]
+    fn pow(x: f64, y: f64) -> f64 {
+        x.powf(y)
+    }
+    #[inline(always)]
+    fn exp(x: f64) -> f64 {
+        x.exp()
+    }
+    #[inline(always)]
+    fn fabs(x: f64) -> f64 {
+        x.abs()
+    }
+    #[inline(always)]
+    fn atan2(y: f64, x: f64) -> f64 {
+        y.atan2(x)
+    }
+    #[inline(always)]
+    fn sec(x: f64) -> f64 {
+        1.0 / x.cos()
+    }
+
+    include!("generated/cylindrical_funcs.rs");
+}
+
+use super::{ProjArgs, Projection};
+
+pub struct ProjectionCylindrical;
+
+impl Projection for ProjectionCylindrical {
+    fn get_view_angle(&self) -> f64 {
+        6.2831853 /* 360 deg */
+    }
+
+    fn mac_x(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dc_view(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dc_view(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dc_pitch(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dc_pitch(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dc_roll(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dc_roll(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dscale(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dscale(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dc_view(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dc_view(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dc_pitch(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dc_pitch(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dc_roll(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dc_roll(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dscale(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dscale(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+}
diff --git a/crates/gipfel-core/src/projection/generated/cylindrical_funcs.rs b/crates/gipfel-core/src/projection/generated/cylindrical_funcs.rs
new file mode 100644
index 0000000..220a7d8
--- /dev/null
+++ b/crates/gipfel-core/src/projection/generated/cylindrical_funcs.rs
@@ -0,0 +1,10 @@
+pub fn mac_x ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; _1 = tan(c_pitch) ; _2 = tan(m_elev) ; return (cos(c_roll)*(m_view-c_view)-(sin(c_roll)*(_2-_1))/(_1*_2+1.0))*scale ; } 
+pub fn mac_y ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; _1 = tan(c_pitch) ; _2 = tan(m_elev) ; return ((-sin(c_roll)*(m_view-c_view))-(cos(c_roll)*(_2-_1))/(_1*_2+1.0))*scale ; } 
+pub fn mac_x_dc_view ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { return -cos(c_roll)*scale ; } 
+pub fn mac_x_dc_pitch ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; _1 = pow(sec(c_pitch),2.0) ; _2 = sin(c_roll) ; _3 = tan(m_elev) ; _4 = tan(c_pitch) ; _5 = _4*_3+1.0 ; return ((_1*_2*_3*(_3-_4))/pow(_5,2.0)+(_1*_2)/_5)*scale ; } 
+pub fn mac_x_dc_roll ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; _1 = tan(c_pitch) ; _2 = tan(m_elev) ; return ((-sin(c_roll)*(m_view-c_view))-(cos(c_roll)*(_2-_1))/(_1*_2+1.0))*scale ; } 
+pub fn mac_x_dscale ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; _1 = tan(c_pitch) ; _2 = tan(m_elev) ; return cos(c_roll)*(m_view-c_view)-(sin(c_roll)*(_2-_1))/(_1*_2+1.0) ; } 
+pub fn mac_y_dc_view ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { return sin(c_roll)*scale ; } 
+pub fn mac_y_dc_pitch ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; _1 = pow(sec(c_pitch),2.0) ; _2 = cos(c_roll) ; _3 = tan(m_elev) ; _4 = tan(c_pitch) ; _5 = _4*_3+1.0 ; return ((_1*_2*_3*(_3-_4))/pow(_5,2.0)+(_1*_2)/_5)*scale ; } 
+pub fn mac_y_dc_roll ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; _1 = tan(c_pitch) ; _2 = tan(m_elev) ; return ((sin(c_roll)*(_2-_1))/(_1*_2+1.0)-cos(c_roll)*(m_view-c_view))*scale ; } 
+pub fn mac_y_dscale ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; _1 = tan(c_pitch) ; _2 = tan(m_elev) ; return (-sin(c_roll)*(m_view-c_view))-(cos(c_roll)*(_2-_1))/(_1*_2+1.0) ; } 
diff --git a/crates/gipfel-core/src/projection/generated/rectilinear_funcs.rs b/crates/gipfel-core/src/projection/generated/rectilinear_funcs.rs
new file mode 100644
index 0000000..7bd450d
--- /dev/null
+++ b/crates/gipfel-core/src/projection/generated/rectilinear_funcs.rs
@@ -0,0 +1,16 @@
+pub fn mac_x ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = pow(_15,2.0)+pow(_13*_11*_12-_1*_5*_14*_11,2.0) ; return scale*_15*(k0*sqrt(_16)+k1*_16+1.0) ; } 
+pub fn mac_y ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = pow(x0+_1*_5*_14*_11+_13*_11*_12,2.0)+pow(_15,2.0) ; return _15*scale*(k0*sqrt(_16)+k1*_16+1.0) ; } 
+pub fn mac_x_dc_view ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; let mut _18 : f64 = 0.0; let mut _19 : f64 = 0.0; let mut _20 : f64 = 0.0; let mut _21 : f64 = 0.0; let mut _22 : f64 = 0.0; let mut _23 : f64 = 0.0; let mut _24 : f64 = 0.0; let mut _25 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1.0/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = cos(c_roll) ; _15 = _6*_9-_8*_7 ; _16 = x0+_14*_5*_15*_12+_1*_12*_13 ; _17 = _14*_12*_13-_1*_5*_15*_12 ; _18 = 1.0/pow(_11,2.0) ; _19 = pow(_5,2.0) ; _20 = pow(_15,2.0) ; _21 = (-_8*_9)-_6*_7 ; _22 = _14*_5*_21*_12+_2*_1*_5*_15*_12-_4*_14*_19*_20*_18-_4*_1*_5*_15*_18*_13 ; _23 = 2.0*_22*_16+2.0*_17*((-_1*_5*_21*_12)+_2*_14*_5*_15*_12+_4*_1*_19*_20*_18-_4*_14*_5*_15*_18*_13) ; _24 = pow(_17,2.0)+pow(_16,2.0) ; _25 = sqrt(_24) ; return _22*scale*(k0*_25+k1*_24+1.0)+scale*_16*((k0*_23)/(2.0*_25)+k1*_23) ; } 
+pub fn mac_x_dc_pitch ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; let mut _18 : f64 = 0.0; let mut _19 : f64 = 0.0; let mut _20 : f64 = 0.0; let mut _21 : f64 = 0.0; let mut _22 : f64 = 0.0; let mut _23 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1.0/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = cos(c_roll) ; _15 = _6*_9-_8*_7 ; _16 = x0+_14*_5*_15*_12+_1*_12*_13 ; _17 = 1.0/pow(_11,2.0) ; _18 = _4*_3-_2*_5*_10 ; _19 = _14*_12*_13-_1*_5*_15*_12 ; _20 = (-_1*_17*_18*_13)-_14*_5*_15*_17*_18+_1 ; _21 = 2.0*_20*_16+2.0*((-_14*_17*_18*_13)+_1*_5*_15*_17*_18+_14)*_19 ; _22 = pow(_19,2.0)+pow(_16,2.0) ; _23 = sqrt(_22) ; return _20*scale*(k0*_23+k1*_22+1.0)+scale*_16*((k0*_21)/(2.0*_23)+k1*_21) ; } 
+pub fn mac_x_dc_roll ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; let mut _18 : f64 = 0.0; let mut _19 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = _13*_11*_12-_1*_5*_14*_11 ; _17 = 2.0*_16*_15+2.0*((-_13*_5*_14*_11)-_1*_11*_12)*_16 ; _18 = pow(_16,2.0)+pow(_15,2.0) ; _19 = sqrt(_18) ; return _16*scale*(k0*_19+k1*_18+1.0)+scale*_15*((k0*_17)/(2.0*_19)+k1*_17) ; } 
+pub fn mac_x_dscale ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = pow(_15,2.0)+pow(_13*_11*_12-_1*_5*_14*_11,2.0) ; return _15*(k0*sqrt(_16)+k1*_16+1.0) ; } 
+pub fn mac_x_dk0 ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; return _15*sqrt(pow(_15,2.0)+pow(_13*_11*_12-_1*_5*_14*_11,2.0))*scale ; } 
+pub fn mac_x_dk1 ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; return _15*(pow(_15,2.0)+pow(_13*_11*_12-_1*_5*_14*_11,2.0))*scale ; } 
+pub fn mac_x_dx0 ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; _1 = sin(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = pow(_15,2.0)+pow(_13*_11*_12-_1*_5*_14*_11,2.0) ; _17 = sqrt(_16) ; return scale*(k0*_17+k1*_16+1.0)+scale*_15*((k0*_15)/_17+2.0*k1*_15) ; } 
+pub fn mac_y_dc_view ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; let mut _18 : f64 = 0.0; let mut _19 : f64 = 0.0; let mut _20 : f64 = 0.0; let mut _21 : f64 = 0.0; let mut _22 : f64 = 0.0; let mut _23 : f64 = 0.0; let mut _24 : f64 = 0.0; let mut _25 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1.0/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = sin(c_roll) ; _15 = _6*_9-_8*_7 ; _16 = _1*_12*_13-_14*_5*_15*_12 ; _17 = 1.0/pow(_11,2.0) ; _18 = pow(_5,2.0) ; _19 = pow(_15,2.0) ; _20 = (-_8*_9)-_6*_7 ; _21 = (-_14*_5*_20*_12)+_2*_1*_5*_15*_12+_4*_14*_18*_19*_17-_4*_1*_5*_15*_17*_13 ; _22 = x0+_1*_5*_15*_12+_14*_12*_13 ; _23 = 2.0*(_1*_5*_20*_12+_2*_14*_5*_15*_12-_4*_1*_18*_19*_17-_4*_14*_5*_15*_17*_13)*_22+2.0*_16*_21 ; _24 = pow(_22,2.0)+pow(_16,2.0) ; _25 = sqrt(_24) ; return _21*scale*(k0*_25+k1*_24+1.0)+_16*scale*((k0*_23)/(2.0*_25)+k1*_23) ; } 
+pub fn mac_y_dc_pitch ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; let mut _18 : f64 = 0.0; let mut _19 : f64 = 0.0; let mut _20 : f64 = 0.0; let mut _21 : f64 = 0.0; let mut _22 : f64 = 0.0; let mut _23 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1.0/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = sin(c_roll) ; _15 = _6*_9-_8*_7 ; _16 = _1*_12*_13-_14*_5*_15*_12 ; _17 = 1.0/pow(_11,2.0) ; _18 = _4*_3-_2*_5*_10 ; _19 = (-_1*_17*_18*_13)+_14*_5*_15*_17*_18+_1 ; _20 = x0+_1*_5*_15*_12+_14*_12*_13 ; _21 = 2.0*((-_14*_17*_18*_13)-_1*_5*_15*_17*_18+_14)*_20+2.0*_19*_16 ; _22 = pow(_20,2.0)+pow(_16,2.0) ; _23 = sqrt(_22) ; return _19*scale*(k0*_23+k1*_22+1.0)+_16*scale*((k0*_21)/(2.0*_23)+k1*_21) ; } 
+pub fn mac_y_dc_roll ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; let mut _17 : f64 = 0.0; let mut _18 : f64 = 0.0; let mut _19 : f64 = 0.0; let mut _20 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = (-_1*_5*_14*_11)-_13*_11*_12 ; _17 = x0+_1*_5*_14*_11+_13*_11*_12 ; _18 = 2.0*_15*_17+2.0*_16*_15 ; _19 = pow(_17,2.0)+pow(_15,2.0) ; _20 = sqrt(_19) ; return _16*scale*(k0*_20+k1*_19+1.0)+_15*scale*((k0*_18)/(2.0*_20)+k1*_18) ; } 
+pub fn mac_y_dscale ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = pow(x0+_1*_5*_14*_11+_13*_11*_12,2.0)+pow(_15,2.0) ; return _15*(k0*sqrt(_16)+k1*_16+1.0) ; } 
+pub fn mac_y_dk0 ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; return _15*scale*sqrt(pow(x0+_1*_5*_14*_11+_13*_11*_12,2.0)+pow(_15,2.0)) ; } 
+pub fn mac_y_dk1 ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; return _15*scale*(pow(x0+_1*_5*_14*_11+_13*_11*_12,2.0)+pow(_15,2.0)) ; } 
+pub fn mac_y_dx0 ( c_view: f64, c_pitch: f64, c_roll: f64, scale: f64, k0: f64, k1: f64, x0: f64, m_view: f64, m_elev: f64 ) -> f64 { let mut _1 : f64 = 0.0; let mut _2 : f64 = 0.0; let mut _3 : f64 = 0.0; let mut _4 : f64 = 0.0; let mut _5 : f64 = 0.0; let mut _6 : f64 = 0.0; let mut _7 : f64 = 0.0; let mut _8 : f64 = 0.0; let mut _9 : f64 = 0.0; let mut _10 : f64 = 0.0; let mut _11 : f64 = 0.0; let mut _12 : f64 = 0.0; let mut _13 : f64 = 0.0; let mut _14 : f64 = 0.0; let mut _15 : f64 = 0.0; let mut _16 : f64 = 0.0; _1 = cos(c_roll) ; _2 = sin(c_pitch) ; _3 = sin(m_elev) ; _4 = cos(c_pitch) ; _5 = cos(m_elev) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1.0/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_roll) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = x0+_1*_5*_14*_11+_13*_11*_12 ; return _15*((_16*k0)/sqrt(pow(_16,2.0)+pow(_15,2.0))+2.0*k1*_16)*scale ; } 
diff --git a/crates/gipfel-core/src/projection/mod.rs b/crates/gipfel-core/src/projection/mod.rs
new file mode 100644
index 0000000..65b74e5
--- /dev/null
+++ b/crates/gipfel-core/src/projection/mod.rs
@@ -0,0 +1,174 @@
+//! Projections: image coordinates as a function of azimuth/elevation angle,
+//! with symbolically pre-generated derivatives (see `codegen/`).
+//!
+//! Faithful port of gipfel's `ProjectionLSQ.{H,cxx}`, `ProjectionRectilinear.*`
+//! and `ProjectionCylindrical.*`.
+
+pub mod cylindrical;
+pub mod rectilinear;
+
+pub const NAN: f64 = f64::NAN;
+
+/// The 7 fitted view parameters (radians where angular).
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+pub struct ViewParams {
+    /// azimuth of image center, radians
+    pub a_center: f64,
+    /// focal scale (pixels)
+    pub scale: f64,
+    /// pitch angle of image center (camera nose up), radians
+    pub a_pitch: f64,
+    /// camera roll, radians
+    pub a_roll: f64,
+    /// radial distortion coefficient 0
+    pub k0: f64,
+    /// radial distortion coefficient 1
+    pub k1: f64,
+    /// distortion center x, pixels
+    pub x0: f64,
+}
+
+impl ViewParams {
+    pub fn new() -> Self {
+        ViewParams {
+            a_center: 0.0,
+            scale: 3500.0,
+            a_pitch: 0.0,
+            a_roll: 0.0,
+            k0: 0.0,
+            k1: 0.0,
+            x0: 0.0,
+        }
+    }
+}
+
+/// The 9 arguments every generated macro function takes.
+#[derive(Clone, Copy, Debug)]
+pub struct ProjArgs {
+    pub c_view: f64,
+    pub c_pitch: f64,
+    pub c_roll: f64,
+    pub scale: f64,
+    pub k0: f64,
+    pub k1: f64,
+    pub x0: f64,
+    pub m_view: f64,
+    pub m_elev: f64,
+}
+
+impl ProjArgs {
+    pub fn from_params(p: &ViewParams, m_view: f64, m_elev: f64) -> Self {
+        ProjArgs {
+            c_view: p.a_center,
+            c_pitch: p.a_pitch,
+            c_roll: p.a_roll,
+            scale: p.scale,
+            k0: p.k0,
+            k1: p.k1,
+            x0: p.x0,
+            m_view,
+            m_elev,
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum ProjectionType {
+    Rectilinear = 0,
+    Cylindrical = 1,
+}
+
+/// A projection plus its symbolic partial derivatives w.r.t. the view
+/// parameters. Methods default to `NAN`, matching the C++ base class.
+pub trait Projection: Send + Sync {
+    /// half-width of the visible azimuth range, radians
+    fn get_view_angle(&self) -> f64;
+
+    fn mac_x(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dc_view(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dc_pitch(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dc_roll(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dscale(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dk0(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dk1(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_x_dx0(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dc_view(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dc_pitch(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dc_roll(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dscale(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dk0(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dk1(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+    fn mac_y_dx0(&self, a: ProjArgs) -> f64 {
+        let _ = a;
+        NAN
+    }
+
+    /// Project azimuth/elevation to image coordinates (relative to image center),
+    /// normalizing azimuth around the view center like the C++ original.
+    fn get_coordinates(&self, alph: f64, elev: f64, parms: &ViewParams) -> (f64, f64) {
+        let mut alph = alph;
+        let pi = crate::hill::PI;
+
+        if alph - parms.a_center > pi {
+            alph -= 2.0 * pi;
+        } else if alph - parms.a_center < -pi {
+            alph += 2.0 * pi;
+        }
+
+        let args = ProjArgs::from_params(parms, alph, elev);
+        (self.mac_x(args), self.mac_y(args))
+    }
+}
+
+pub fn projection_from_type(t: ProjectionType) -> Box<dyn Projection> {
+    match t {
+        ProjectionType::Rectilinear => Box::new(rectilinear::ProjectionRectilinear),
+        ProjectionType::Cylindrical => Box::new(cylindrical::ProjectionCylindrical),
+    }
+}
diff --git a/crates/gipfel-core/src/projection/rectilinear.rs b/crates/gipfel-core/src/projection/rectilinear.rs
new file mode 100644
index 0000000..a7037d6
--- /dev/null
+++ b/crates/gipfel-core/src/projection/rectilinear.rs
@@ -0,0 +1,104 @@
+//! Rectilinear (gnomonic) projection with lens distortion.
+
+mod funcs {
+    #![allow(non_snake_case, unused_parens, unused_variables, dead_code, clippy::all)]
+
+    // math shims: the maxima-generated code uses C-style calls
+    #[inline(always)]
+    fn sin(x: f64) -> f64 {
+        x.sin()
+    }
+    #[inline(always)]
+    fn cos(x: f64) -> f64 {
+        x.cos()
+    }
+    #[inline(always)]
+    fn tan(x: f64) -> f64 {
+        x.tan()
+    }
+    #[inline(always)]
+    fn sqrt(x: f64) -> f64 {
+        x.sqrt()
+    }
+    #[inline(always)]
+    fn pow(x: f64, y: f64) -> f64 {
+        x.powf(y)
+    }
+    #[inline(always)]
+    fn exp(x: f64) -> f64 {
+        x.exp()
+    }
+    #[inline(always)]
+    fn fabs(x: f64) -> f64 {
+        x.abs()
+    }
+    #[inline(always)]
+    fn atan2(y: f64, x: f64) -> f64 {
+        y.atan2(x)
+    }
+    #[inline(always)]
+    fn sec(x: f64) -> f64 {
+        1.0 / x.cos()
+    }
+
+    include!("generated/rectilinear_funcs.rs");
+}
+
+use super::{ProjArgs, Projection};
+
+pub struct ProjectionRectilinear;
+
+impl Projection for ProjectionRectilinear {
+    fn get_view_angle(&self) -> f64 {
+        1.0471976 /* 60 deg */
+    }
+
+    fn mac_x(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dc_view(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dc_view(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dc_pitch(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dc_pitch(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dc_roll(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dc_roll(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dscale(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dscale(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dk0(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dk0(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dk1(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dk1(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_x_dx0(&self, a: ProjArgs) -> f64 {
+        funcs::mac_x_dx0(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dc_view(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dc_view(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dc_pitch(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dc_pitch(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dc_roll(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dc_roll(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dscale(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dscale(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dk0(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dk0(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dk1(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dk1(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+    fn mac_y_dx0(&self, a: ProjArgs) -> f64 {
+        funcs::mac_y_dx0(a.c_view, a.c_pitch, a.c_roll, a.scale, a.k0, a.k1, a.x0, a.m_view, a.m_elev)
+    }
+}
diff --git a/crates/gipfel-core/src/stitch.rs b/crates/gipfel-core/src/stitch.rs
new file mode 100644
index 0000000..a311961
--- /dev/null
+++ b/crates/gipfel-core/src/stitch.rs
@@ -0,0 +1,323 @@
+//! Cylindrical panorama resampling — port of the C++ `Stitch.cxx` /
+//! `ScanImage.cxx` stitch mode.
+//!
+//! The output is a cylindrical (equirectangular-in-azimuth, tan-in-elevation)
+//! image spanning `view_start..view_end` degrees of azimuth. Each output
+//! pixel is mapped back through every source image's fitted projection; the
+//! first source that covers the direction contributes its (resampled) color.
+//!
+//! All sampling arithmetic reproduces the C implementation bit-for-bit:
+//! colors are handled on the 0..=65025 scale (`value * 255`), nearest uses
+//! `rint` (round-half-to-even), bicubic uses the same Keys cubic and only
+//! rounds after the final vertical interpolation.
+
+use crate::metadata::{ImageMetaData, apply_image_metadata};
+use crate::panorama::Panorama;
+use image::RgbImage;
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum ScanMode {
+    Nearest,
+    Bicubic,
+}
+
+/// C MAX_VALUE: clamp bound on the 0..=65025 (value*255) scale.
+pub const MAX_VALUE: i64 = 65025;
+
+fn pixel(img: &RgbImage, x: i64, y: i64) -> Option<[i64; 3]> {
+    if x < 0 || y < 0 || x >= img.width() as i64 || y >= img.height() as i64 {
+        return None;
+    }
+    let p = img.get_pixel(x as u32, y as u32);
+    Some([p[0] as i64 * 255, p[1] as i64 * 255, p[2] as i64 * 255])
+}
+
+/// C ScanImage::get_pixel_nearest: NaN-guard, then round to nearest pixel.
+fn get_pixel_nearest(img: &RgbImage, x: f64, y: f64) -> Option<[i64; 3]> {
+    if x.is_nan() || y.is_nan() {
+        return None;
+    }
+    pixel(img, x.round_ties_even() as i64, y.round_ties_even() as i64)
+}
+
+/// C ScanImage interp_cubic (Keys cubic convolution kernel, evaluated in
+/// Bernstein-like power basis).
+#[inline]
+fn interp_cubic(x: f64, x2: f64, x3: f64, v: &[f64; 4]) -> f64 {
+    let a0 = v[3] - v[2] - v[0] + v[1];
+    let a1 = v[0] - v[1] - a0;
+    let a2 = v[2] - v[0];
+    let a3 = v[1];
+    a0 * x3 + a1 * x2 + a2 * x + a3
+}
+
+/// C ScanImage::get_pixel_bicubic. Any of the 16 taps outside the source
+/// makes the pixel unset (C returns 1), matching the "leave black" behavior.
+fn get_pixel_bicubic(img: &RgbImage, x: f64, y: f64) -> Option<[i64; 3]> {
+    if x.is_nan() || y.is_nan() {
+        return None;
+    }
+    let fl_x = x.floor();
+    let fl_y = y.floor();
+    let dx = x - fl_x;
+    let dx2 = dx * dx;
+    let dx3 = dx2 * dx;
+    let dy = y - fl_y;
+    let dy2 = dy * dy;
+    let dy3 = dy2 * dy;
+
+    let mut c1 = [[0f64; 4]; 3];
+    for iy in 0..4usize {
+        let mut c = [[0f64; 4]; 3];
+        for ix in 0..4usize {
+            let p = pixel(img, fl_x as i64 + ix as i64 - 1, fl_y as i64 + iy as i64 - 1)?;
+            for l in 0..3 {
+                c[l][ix] = p[l] as f64;
+            }
+        }
+        for l in 0..3 {
+            c1[l][iy] = interp_cubic(dx, dx2, dx3, &c[l]);
+        }
+    }
+    Some([
+        interp_cubic(dy, dy2, dy3, &c1[0]).round_ties_even() as i64,
+        interp_cubic(dy, dy2, dy3, &c1[1]).round_ties_even() as i64,
+        interp_cubic(dy, dy2, dy3, &c1[2]).round_ties_even() as i64,
+    ])
+}
+
+/// C ScanImage::get_pixel(mode, x, y). Values on the 0..=65025 scale;
+/// bicubic may overshoot (clamped by the caller, as in C).
+pub fn get_pixel(img: &RgbImage, mode: ScanMode, x: f64, y: f64) -> Option<[i64; 3]> {
+    match mode {
+        ScanMode::Nearest => get_pixel_nearest(img, x, y),
+        ScanMode::Bicubic => get_pixel_bicubic(img, x, y),
+    }
+}
+
+/// One input photo: its fitted projection plus its decoded pixels.
+pub struct StitchSource {
+    pub pan: Panorama,
+    pub img: RgbImage,
+}
+
+impl StitchSource {
+    /// Load a JPEG and apply its gipfel metadata (comment or EXIF), like
+    /// `GipfelWidget::load_image` does for the stitch mode.
+    pub fn load(path: &str) -> Result<Self, String> {
+        let img = image::open(path)
+            .map(|i| i.to_rgb8())
+            .map_err(|e| format!("{}: {e}", path))?;
+        let mut md = ImageMetaData::new();
+        md.load_image(path);
+        let mut pan = Panorama::new();
+        apply_image_metadata(&mut pan, &md, img.width(), img.height());
+        Ok(Self { pan, img })
+    }
+
+    /// C GipfelWidget::get_pixel: forward-project (azimuth, elevation)
+    /// through this image's projection and sample the source.
+    pub fn get_pixel(&self, mode: ScanMode, a_alph: f64, a_elev: f64) -> Option<[i64; 3]> {
+        let (px, py) = self.pan.project_point(a_alph, a_elev)?;
+        get_pixel(
+            &self.img,
+            mode,
+            px + self.img.width() as f64 / 2.0,
+            py + self.img.height() as f64 / 2.0,
+        )
+    }
+}
+
+/// The resampled cylindrical panorama. Pixel values are RGB triplets on the
+/// C 0..=65025 scale (clamped); `hit` marks pixels some source contributed
+/// to (unset pixels are black in the C output).
+pub struct StitchedImage {
+    pub w: u32,
+    pub h: u32,
+    pub pixels: Vec<[u16; 3]>,
+    pub hit: Vec<bool>,
+}
+
+/// Port of `Stitch::resample`: output column x maps linearly to azimuth,
+/// output row y maps to elevation via `atan((y_off - y) / radius)`.
+pub fn resample(
+    sources: &[StitchSource],
+    mode: ScanMode,
+    w: u32,
+    h: u32,
+    view_start_deg: f64,
+    view_end_deg: f64,
+) -> StitchedImage {
+    let view_start = view_start_deg.to_radians();
+    let view_end = view_end_deg.to_radians();
+    let mut pixels = vec![[0u16; 3]; (w as usize) * (h as usize)];
+    let mut hit = vec![false; (w as usize) * (h as usize)];
+    if !(view_end > view_start) || w == 0 || h == 0 {
+        return StitchedImage {
+            w,
+            h,
+            pixels,
+            hit,
+        };
+    }
+    let step_view = (view_end - view_start) / w as f64;
+    let y_off = (h / 2) as f64;
+    let radius = w as f64 / (view_end - view_start);
+
+    for y in 0..h {
+        let a_elev = ((y_off - y as f64) / radius).atan();
+        for x in 0..w {
+            let a_view = view_start + x as f64 * step_view;
+            for src in sources {
+                let Some(rgb) = src.get_pixel(mode, a_view, a_elev) else {
+                    continue;
+                };
+                let clamped = [
+                    rgb[0].clamp(0, MAX_VALUE) as u16,
+                    rgb[1].clamp(0, MAX_VALUE) as u16,
+                    rgb[2].clamp(0, MAX_VALUE) as u16,
+                ];
+                let i = (y as usize) * (w as usize) + (x as usize);
+                pixels[i] = clamped;
+                hit[i] = true;
+                break; // C: first contributing image wins
+            }
+        }
+    }
+
+    StitchedImage {
+        w,
+        h,
+        pixels,
+        hit,
+    }
+}
+
+/// Write an RGBA TIFF like the C `TIFFOutputImage`: 8 bit (value/255, alpha
+/// 255) or 16 bit (raw 0..=65025, alpha 65025), deflate-compressed.
+pub fn write_tiff(path: &str, img: &StitchedImage, bits16: bool) -> Result<(), String> {
+    use tiff::encoder::colortype::{RGBA16, RGBA8};
+    use tiff::encoder::{Compression, TiffEncoder};
+
+    let n = (img.w as usize) * (img.h as usize);
+    let file = std::fs::File::create(path).map_err(|e| format!("{}: {e}", path))?;
+    let mut enc = TiffEncoder::new(file)
+        .map_err(|e| format!("{}: {e}", path))?
+        .with_compression(Compression::Deflate(Default::default()));
+    if bits16 {
+        let mut buf: Vec<u16> = Vec::with_capacity(n * 4);
+        for p in &img.pixels {
+            buf.extend_from_slice(&[p[0], p[1], p[2], MAX_VALUE as u16]);
+        }
+        enc.write_image::<RGBA16>(img.w, img.h, &buf)
+            .map_err(|e| format!("{}: {e}", path))?;
+    } else {
+        let mut buf: Vec<u8> = Vec::with_capacity(n * 4);
+        for p in &img.pixels {
+            buf.extend_from_slice(&[(p[0] / 255) as u8, (p[1] / 255) as u8, (p[2] / 255) as u8, 255]);
+        }
+        enc.write_image::<RGBA8>(img.w, img.h, &buf)
+            .map_err(|e| format!("{}: {e}", path))?;
+    }
+    Ok(())
+}
+
+/// Write a JPEG (quality 90, like the C `JPEGOutputImage`).
+pub fn write_jpeg(path: &str, img: &StitchedImage, quality: u8) -> Result<(), String> {
+    use image::codecs::jpeg::JpegEncoder;
+    use image::ImageEncoder;
+
+    let rgb: Vec<u8> = img
+        .pixels
+        .iter()
+        .flat_map(|p| [(p[0] / 255) as u8, (p[1] / 255) as u8, (p[2] / 255) as u8])
+        .collect();
+    let enc = JpegEncoder::new_with_quality(
+        std::io::BufWriter::new(std::fs::File::create(path).map_err(|e| format!("{}: {e}", path))?),
+        quality,
+    );
+    enc.write_image(&rgb, img.w, img.h, image::ExtendedColorType::Rgb8)
+        .map_err(|e| format!("{}: {e}", path))?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn solid(v: u8, w: u32, h: u32) -> RgbImage {
+        RgbImage::from_pixel(w, h, image::Rgb([v, v, v]))
+    }
+
+    #[test]
+    fn nearest_rounds_half_to_even() {
+        let img = solid(100, 4, 4);
+        // 1.5 -> 2 (ties to even), 2.5 -> 2
+        assert_eq!(get_pixel_nearest(&img, 1.5, 0.0), Some([100 * 255; 3]));
+        assert_eq!(get_pixel_nearest(&img, 2.5, 0.0), Some([100 * 255; 3]));
+        assert_eq!(get_pixel_nearest(&img, -0.4, 0.0), Some([100 * 255; 3]));
+        assert_eq!(get_pixel_nearest(&img, -0.6, 0.0), None);
+        assert_eq!(get_pixel_nearest(&img, f64::NAN, 0.0), None);
+    }
+
+    #[test]
+    fn bicubic_constant_and_bounds() {
+        let img = solid(100, 4, 4);
+        // constant image: cubic reproduces the constant exactly
+        assert_eq!(get_pixel_bicubic(&img, 1.3, 1.7), Some([100 * 255; 3]));
+        // any tap outside the 4x4 neighborhood -> unset
+        assert_eq!(get_pixel_bicubic(&img, 0.0, 2.0), None); // fl_x-1 = -1
+        assert_eq!(get_pixel_bicubic(&img, 2.0, 3.5), None); // fl_y+2 = 5
+        assert_eq!(get_pixel_bicubic(&img, 1.0, 1.0), Some([100 * 255; 3]));
+    }
+
+    #[test]
+    fn bicubic_matches_keys_cubic_on_ramp() {
+        // Keys cubic (a=-1/2): on a linear ramp the kernel yields
+        // a + b*(2 dx^3 - 3 dx^2 + 2 dx), not the linear value.
+        let mut img = RgbImage::new(8, 8);
+        for x in 0..8 {
+            for y in 0..8 {
+                img.put_pixel(x, y, image::Rgb([(x as u8) * 30, 0, 0]));
+            }
+        }
+        let got = get_pixel_bicubic(&img, 3.25, 4.0).unwrap();
+        let a = 3.0 * 30.0 * 255.0;
+        let b = 30.0 * 255.0;
+        let dx = 0.25f64;
+        let want = (a + b * (2.0 * dx * dx * dx - 3.0 * dx * dx + 2.0 * dx)).round_ties_even();
+        assert_eq!(got[0], want as i64);
+    }
+
+    #[test]
+    fn bicubic_exact_at_integer_positions() {
+        // at integer sample coordinates (dx = dy = 0) the cubic kernel
+        // reproduces the center tap exactly -> a 1:1 resample is lossless
+        let mut img = RgbImage::new(8, 8);
+        for x in 0..8 {
+            for y in 0..8 {
+                img.put_pixel(x, y, image::Rgb([(x * 7 + y * 3) as u8, (y * 5) as u8, 9]));
+            }
+        }
+        for y in 1..6 {
+            for x in 1..6 {
+                let p = img.get_pixel(x, y).0;
+                assert_eq!(
+                    get_pixel_bicubic(&img, x as f64, y as f64).unwrap(),
+                    [p[0] as i64 * 255, p[1] as i64 * 255, p[2] as i64 * 255]
+                );
+            }
+        }
+    }
+
+    #[test]
+    fn resample_rejects_empty_range() {
+        let img = StitchSource {
+            pan: Panorama::new(),
+            img: solid(50, 8, 8),
+        };
+        let out = resample(&[img], ScanMode::Nearest, 4, 4, 10.0, 10.0);
+        assert_eq!(out.hit.len(), 16);
+        assert!(out.hit.iter().all(|h| !h));
+    }
+}
diff --git a/crates/gipfel-core/src/track.rs b/crates/gipfel-core/src/track.rs
new file mode 100644
index 0000000..5450aa8
--- /dev/null
+++ b/crates/gipfel-core/src/track.rs
@@ -0,0 +1,248 @@
+//! GPS track loading (GPX).
+//!
+//! Minimal streaming parser built directly on quick-xml: we only need the
+//! `trkpt` positions, and real-world files (Garmin etc.) are full of vendor
+//! `<extensions>` blocks that stricter parsers choke on. Waypoints and
+//! routes are ignored; only track points are read.
+//!
+//! Security posture for untrusted files:
+//! - quick-xml is used with `default-features = false` (no serde, no encoding
+//!   detection); it never fetches external DTDs/entities and expands only the
+//!   five predefined XML entities, so XXE and entity-expansion ("billion
+//!   laughs") attacks are structurally impossible; unknown entity references
+//!   make the attribute fail to parse and the point is skipped
+//! - input size is capped (MAX_GPX_BYTES) before anything is parsed
+//! - the parser only reads lat/lon attributes and <ele> text; all other
+//!   elements (including vendor extensions) are ignored without being
+//!   interpreted
+
+use crate::hill::{Hill, FLAG_TRACK_POINT};
+use quick_xml::events::Event;
+
+/// Reject absurdly large track files (a 64 MiB GPX is already ~500k points).
+pub const MAX_GPX_BYTES: u64 = 64 * 1024 * 1024;
+
+/// Load track points from a GPX file (all tracks/segments, in file order).
+///
+/// Consecutive duplicate positions are dropped; the result is decimated with
+/// a uniform stride to at most `max_points` (GPX logs easily reach 10k
+/// points, which would bloat the panorama's hill list).
+pub fn load_gpx(path: &str, max_points: usize) -> Result<Vec<Hill>, String> {
+    let size = std::fs::metadata(path).map_err(|e| format!("{path}: {e}"))?;
+    if size.len() > MAX_GPX_BYTES {
+        return Err(format!("{path}: file too large ({} bytes)", size.len()));
+    }
+    let data = std::fs::read_to_string(path).map_err(|e| format!("{path}: {e}"))?;
+    let mut reader = quick_xml::Reader::from_str(&data);
+    reader.config_mut().trim_text(true);
+
+    let mut pts: Vec<(f64, f64, f64)> = Vec::new(); // (lat, lon, ele) degrees
+    let mut depth: usize = 0;
+    let mut trkpt_depth: Option<usize> = None;
+    let mut in_ele = false;
+    let (mut lat, mut lon, mut ele) = (f64::NAN, f64::NAN, 0.0);
+
+    fn push(pts: &mut Vec<(f64, f64, f64)>, lat: f64, lon: f64, ele: f64) {
+        if lat.is_nan() || lon.is_nan() {
+            return;
+        }
+        if let Some(&(lata, lona, _)) = pts.last() {
+            if lata == lat && lona == lon {
+                return; // consecutive duplicate fix
+            }
+        }
+        pts.push((lat, lon, ele));
+    }
+
+    loop {
+        match reader.read_event().map_err(|e| format!("{path}: {e}"))? {
+            Event::Eof => break,
+            Event::Empty(e) => {
+                if e.local_name().as_ref() == b"trkpt" {
+                    let (la, lo) = read_latlon(&e);
+                    lat = la;
+                    lon = lo;
+                    ele = 0.0;
+                    push(&mut pts, lat, lon, ele);
+                }
+            }
+            Event::Start(e) => {
+                depth += 1;
+                match e.local_name().as_ref() {
+                    b"trkpt" => {
+                        trkpt_depth = Some(depth);
+                        ele = 0.0;
+                        let (la, lo) = read_latlon(&e);
+                        lat = la;
+                        lon = lo;
+                    }
+                    // accept <ele> only as a direct child of <trkpt>, so
+                    // elevation-like tags inside vendor extensions are ignored
+                    b"ele" => {
+                        in_ele = trkpt_depth == Some(depth - 1);
+                        if in_ele {
+                            ele = 0.0;
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            Event::Text(t) => {
+                if in_ele {
+                    if let Ok(s) = t.decode() {
+                        if let Ok(v) = s.trim().parse() {
+                            ele = v;
+                        }
+                    }
+                }
+            }
+            Event::End(e) => {
+                match e.local_name().as_ref() {
+                    b"ele" => in_ele = false,
+                    b"trkpt" => {
+                        push(&mut pts, lat, lon, ele);
+                        trkpt_depth = None;
+                    }
+                    _ => {}
+                }
+                depth = depth.saturating_sub(1);
+            }
+            _ => {}
+        }
+    }
+
+    if pts.is_empty() {
+        return Err(format!("{path}: no track points"));
+    }
+
+    let stride = pts.len().div_ceil(max_points.max(1));
+    Ok(pts
+        .iter()
+        .step_by(stride)
+        .map(|&(lat, lon, ele)| {
+            let mut h = Hill::new("track", lat.to_radians(), lon.to_radians(), ele);
+            h.flags |= FLAG_TRACK_POINT;
+            h
+        })
+        .collect())
+}
+
+fn read_latlon(e: &quick_xml::events::BytesStart) -> (f64, f64) {
+    let (mut lat, mut lon) = (f64::NAN, f64::NAN);
+    for a in e.attributes().flatten() {
+        if let Ok(v) = a.normalized_value(quick_xml::XmlVersion::Implicit1_0) {
+            match a.key.local_name().as_ref() {
+                b"lat" => lat = v.trim().parse().unwrap_or(f64::NAN),
+                b"lon" => lon = v.trim().parse().unwrap_or(f64::NAN),
+                _ => {}
+            }
+        }
+    }
+    (lat, lon)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn tmp(name: &str, content: &str) -> std::path::PathBuf {
+        let dir = std::env::temp_dir().join(format!("gipfel-gpx-test-{name}"));
+        std::fs::create_dir_all(&dir).unwrap();
+        let p = dir.join("t.gpx");
+        std::fs::write(&p, content).unwrap();
+        p
+    }
+
+    #[test]
+    fn gpx_track_roundtrip() {
+        let gpx = r#"<?xml version="1.0" encoding="UTF-8"?>
+<gpx version="1.1" creator="test" xmlns="http://www.topografix.com/GPX/1/1">
+  <trk><name>tour</name><trkseg>
+    <trkpt lat="47.30" lon="11.10"><ele>1000</ele></trkpt>
+    <trkpt lat="47.31" lon="11.11"><ele>1100</ele></trkpt>
+    <trkpt lat="47.31" lon="11.11"><ele>1100</ele></trkpt>
+    <trkpt lat="47.32" lon="11.12"><ele>1200</ele></trkpt>
+  </trkseg></trk>
+</gpx>"#;
+        let p = tmp("rt", gpx);
+        let hills = load_gpx(p.to_str().unwrap(), 100).unwrap();
+        assert_eq!(hills.len(), 3); // duplicate dropped
+        assert!(hills.iter().all(|h| h.is_track_point()));
+        assert!((hills[1].phi - 47.31f64.to_radians()).abs() < 1e-12);
+        assert!((hills[2].height - 1200.0).abs() < 1e-9);
+    }
+
+    #[test]
+    fn gpx_vendor_extensions_ignored() {
+        // Garmin-style files are full of vendor extension blocks; they must
+        // not confuse the parser (and must not contribute elevation).
+        let gpx = r#"<?xml version="1.0" encoding="utf-8"?>
+<gpx creator="Garmin Desktop App" version="1.1" xmlns="http://www.topografix.com/GPX/1/1"
+     xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1">
+  <metadata><extensions><gpxx:TrackPointExtension xmlns:gpxx="x" version="1.0"/></extensions></metadata>
+  <trk><name>T</name><extensions><gpxx2:x xmlns:gpxx2="y"><ele>9999</ele></gpxx2:x></extensions>
+    <trkseg>
+      <trkpt lat="47.30" lon="11.10">
+        <ele>1000</ele>
+        <extensions><gpxtpx:TrackPointExtension><gpxtpx:hr>120</gpxtpx:hr></gpxtpx:TrackPointExtension></extensions>
+      </trkpt>
+      <trkpt lat="47.31" lon="11.11"><ele>1100</ele></trkpt>
+    </trkseg>
+  </trk>
+</gpx>"#;
+        let p = tmp("ext", gpx);
+        let hills = load_gpx(p.to_str().unwrap(), 100).unwrap();
+        assert_eq!(hills.len(), 2);
+        assert!((hills[0].height - 1000.0).abs() < 1e-9); // not 9999
+    }
+
+    #[test]
+    fn gpx_decimation() {
+        let mut pts = String::new();
+        for i in 0..1000 {
+            pts.push_str(&format!(
+                "<trkpt lat=\"{}\" lon=\"{}\"><ele>1</ele></trkpt>",
+                47.0 + i as f64 * 1e-5,
+                11.0 + i as f64 * 1e-5
+            ));
+        }
+        let gpx = format!(
+            r#"<?xml version="1.0"?><gpx version="1.1" creator="t" xmlns="http://www.topografix.com/GPX/1/1"><trk><trkseg>{pts}</trkseg></trk></gpx>"#
+        );
+        let p = tmp("dec", &gpx);
+        let hills = load_gpx(p.to_str().unwrap(), 100).unwrap();
+        assert!(hills.len() <= 100);
+    }
+
+    #[test]
+    fn gpx_bom_is_tolerated() {
+        // Garmin Desktop App writes a UTF-8 BOM; it must not break parsing.
+        let gpx = format!(
+            "\u{feff}<?xml version=\"1.0\"?><gpx version=\"1.1\" creator=\"t\" xmlns=\"http://www.topografix.com/GPX/1/1\"><trk><trkseg><trkpt lat=\"47.30\" lon=\"11.10\"/></trkseg></trk></gpx>"
+        );
+        let p = tmp("bom", &gpx);
+        let hills = load_gpx(p.to_str().unwrap(), 100).unwrap();
+        assert_eq!(hills.len(), 1);
+    }
+
+    #[test]
+    fn gpx_entity_injection_is_inert() {
+        // XXE / entity-expansion attempts: quick-xml only expands the five
+        // predefined entities; unknown references make the attribute fail to
+        // parse, so the point is simply skipped (never expanded, never fetched).
+        let gpx = r#"<?xml version="1.0"?>
+<!DOCTYPE gpx [ <!ENTITY evil "47.30"> <!ENTITY sys SYSTEM "file:///etc/passwd"> ]>
+<gpx version="1.1" creator="t" xmlns="http://www.topografix.com/GPX/1/1">
+  <trk><trkseg>
+    <trkpt lat="&evil;" lon="11.10"><ele>1000</ele></trkpt>
+    <trkpt lat="47.31" lon="&sys;"><ele>1100</ele></trkpt>
+    <trkpt lat="47.32" lon="11.12"><ele>1200</ele></trkpt>
+  </trkseg></trk>
+</gpx>"#;
+        let p = tmp("ent", gpx);
+        let hills = load_gpx(p.to_str().unwrap(), 100).unwrap();
+        // only the clean point survives; the entity-bearing ones are skipped
+        assert_eq!(hills.len(), 1);
+        assert!((hills[0].phi - 47.32f64.to_radians()).abs() < 1e-12);
+    }
+}
diff --git a/crates/gipfel-core/tests/golden.rs b/crates/gipfel-core/tests/golden.rs
new file mode 100644
index 0000000..fb12e40
--- /dev/null
+++ b/crates/gipfel-core/tests/golden.rs
@@ -0,0 +1,511 @@
+//! Golden-value tests against the original C++ implementation.
+//!
+//! Goldens are generated by `tests/gen_golden.sh` (needs the built C++ tree).
+//! Run with `cargo test --test golden` (unit tests: `cargo test --lib`).
+
+use gipfel_core::hill;
+use gipfel_core::metadata::ImageMetaData;
+use gipfel_core::panorama::Panorama;
+use gipfel_core::projection::{
+    cylindrical::ProjectionCylindrical, rectilinear::ProjectionRectilinear, ProjArgs, Projection, ProjectionType,
+};
+
+fn golden(name: &str) -> Vec<String> {
+    let path = format!(
+        "{}/../../tests/golden/{}",
+        env!("CARGO_MANIFEST_DIR"),
+        name
+    );
+    std::fs::read_to_string(&path)
+        .unwrap_or_else(|_| panic!("missing golden file {} (run tests/gen_golden.sh)", path))
+        .lines()
+        .map(|l| l.to_string())
+        .collect()
+}
+
+fn data_path() -> Option<String> {
+    if let Ok(p) = std::env::var("GIPFEL_DATA") {
+        if std::path::Path::new(&p).exists() {
+            return Some(p);
+        }
+    }
+    let home = std::env::var("HOME").unwrap_or_default();
+    let p = format!("{}/gipfel/gipfel.dat", home);
+    std::path::Path::new(&p).exists().then_some(p)
+}
+
+/// relative-or-absolute closeness (libm differences between glibc and Rust)
+fn close(a: f64, b: f64) -> bool {
+    if a.is_nan() && b.is_nan() {
+        return true;
+    }
+    if a.is_infinite() || b.is_infinite() {
+        return a == b;
+    }
+    (a - b).abs() <= 1e-9f64.max(a.abs() * 1e-9)
+}
+
+#[test]
+fn generated_functions_match_c() {
+    let golden = golden("funcs.txt");
+    let rect = ProjectionRectilinear;
+    let cyl = ProjectionCylindrical;
+
+    assert_eq!(golden.len(), 200);
+
+    for (k, line) in golden.iter().enumerate() {
+        let kk = k as f64;
+        let c_view = -3.0 + 0.03 * kk;
+        let c_pitch = 0.10 * (0.11 * kk).sin();
+        let c_roll = 0.05 * (0.07 * kk).cos();
+        let scale = 2000.0 + 37.0 * (kk % 19.0);
+        let k0 = 0.001 * (0.31 * kk).sin();
+        let k1 = 0.0001 * (0.17 * kk).cos();
+        let x0 = 50.0 * (0.13 * kk).sin();
+        let m_view = c_view + 0.5 * (0.23 * kk).sin();
+        let m_elev = 0.05 * (0.19 * kk).cos();
+
+        let a = ProjArgs { c_view, c_pitch, c_roll, scale, k0, k1, x0, m_view, m_elev };
+
+        let mine: Vec<f64> = vec![
+            rect.mac_x(a),
+            rect.mac_y(a),
+            rect.mac_x_dc_view(a),
+            rect.mac_x_dc_pitch(a),
+            rect.mac_x_dc_roll(a),
+            rect.mac_x_dscale(a),
+            rect.mac_x_dk0(a),
+            rect.mac_x_dk1(a),
+            rect.mac_x_dx0(a),
+            rect.mac_y_dc_view(a),
+            rect.mac_y_dc_pitch(a),
+            rect.mac_y_dc_roll(a),
+            rect.mac_y_dscale(a),
+            rect.mac_y_dk0(a),
+            rect.mac_y_dk1(a),
+            rect.mac_y_dx0(a),
+            cyl.mac_x(a),
+            cyl.mac_y(a),
+            cyl.mac_x_dc_view(a),
+            cyl.mac_x_dc_pitch(a),
+            cyl.mac_x_dc_roll(a),
+            cyl.mac_x_dscale(a),
+            cyl.mac_y_dc_view(a),
+            cyl.mac_y_dc_pitch(a),
+            cyl.mac_y_dc_roll(a),
+            cyl.mac_y_dscale(a),
+        ];
+
+        let theirs: Vec<f64> = line.split_whitespace().map(|t| t.parse().unwrap()).collect();
+        assert_eq!(mine.len(), theirs.len(), "line {}", k);
+
+        for (i, (m, t)) in mine.iter().zip(theirs.iter()).enumerate() {
+            assert!(close(*m, *t), "k={} fn#{}: rust {} != c {}", k, i, m, t);
+        }
+    }
+}
+
+/// derivatives of the generated code vs. central finite differences
+#[test]
+fn derivatives_match_finite_differences() {
+    let rect = ProjectionRectilinear;
+    let base = ProjArgs {
+        c_view: 0.3,
+        c_pitch: 0.05,
+        c_roll: 0.02,
+        scale: 3000.0,
+        k0: 0.001,
+        k1: 0.0002,
+        x0: 12.0,
+        m_view: 0.5,
+        m_elev: 0.04,
+    };
+
+    let h = 1e-6f64;
+
+    // (arg index, analytic derivative fn)
+    let dx: [(usize, &dyn Fn(ProjArgs) -> f64); 7] = [
+        (0, &|a| rect.mac_x_dc_view(a)),
+        (1, &|a| rect.mac_x_dc_pitch(a)),
+        (2, &|a| rect.mac_x_dc_roll(a)),
+        (3, &|a| rect.mac_x_dscale(a)),
+        (4, &|a| rect.mac_x_dk0(a)),
+        (5, &|a| rect.mac_x_dk1(a)),
+        (6, &|a| rect.mac_x_dx0(a)),
+    ];
+    let dy: [(usize, &dyn Fn(ProjArgs) -> f64); 7] = [
+        (0, &|a| rect.mac_y_dc_view(a)),
+        (1, &|a| rect.mac_y_dc_pitch(a)),
+        (2, &|a| rect.mac_y_dc_roll(a)),
+        (3, &|a| rect.mac_y_dscale(a)),
+        (4, &|a| rect.mac_y_dk0(a)),
+        (5, &|a| rect.mac_y_dk1(a)),
+        (6, &|a| rect.mac_y_dx0(a)),
+    ];
+
+    let set = |a: ProjArgs, idx: usize, v: f64| -> ProjArgs {
+        let mut b = a;
+        match idx {
+            0 => b.c_view = v,
+            1 => b.c_pitch = v,
+            2 => b.c_roll = v,
+            3 => b.scale = v,
+            4 => b.k0 = v,
+            5 => b.k1 = v,
+            _ => b.x0 = v,
+        }
+        b
+    };
+
+    for (idx, f) in dx {
+        let plus = rect.mac_x(set(base, idx, base_val(&base, idx) + h));
+        let minus = rect.mac_x(set(base, idx, base_val(&base, idx) - h));
+        let fd = (plus - minus) / (2.0 * h);
+        let an = f(base);
+        assert!(
+            (an - fd).abs() <= 1e-4f64.max(an.abs() * 1e-5),
+            "dx deriv arg {}: analytic {} finite-diff {}",
+            idx,
+            an,
+            fd
+        );
+    }
+    for (idx, f) in dy {
+        let plus = rect.mac_y(set(base, idx, base_val(&base, idx) + h));
+        let minus = rect.mac_y(set(base, idx, base_val(&base, idx) - h));
+        let fd = (plus - minus) / (2.0 * h);
+        let an = f(base);
+        assert!(
+            (an - fd).abs() <= 1e-4f64.max(an.abs() * 1e-5),
+            "dy deriv arg {}: analytic {} finite-diff {}",
+            idx,
+            an,
+            fd
+        );
+    }
+}
+
+fn base_val(a: &ProjArgs, idx: usize) -> f64 {
+    match idx {
+        0 => a.c_view,
+        1 => a.c_pitch,
+        2 => a.c_roll,
+        3 => a.scale,
+        4 => a.k0,
+        5 => a.k1,
+        _ => a.x0,
+    }
+}
+
+/// full fit (geodesy + projection + GSL LM) against the C++ fitdump
+fn fit_golden(projtype: ProjectionType, file: &str) {
+    let Some(data) = data_path() else {
+        eprintln!("gipfel.dat not found, skipping");
+        return;
+    };
+    let golden = golden(file);
+
+    let mut pan = Panorama::new();
+    pan.load_data(&data).unwrap();
+    pan.set_projection(projtype);
+
+    pan.set_view_lat(47.36);
+    pan.set_view_long(11.15);
+    pan.set_view_height(2100.0);
+
+    // ground truth
+    pan.set_center_angle(20.0);
+    pan.set_pitch_angle(0.0);
+    pan.set_roll_angle(1.0);
+    pan.set_scale(3000.0);
+
+    // snapshot first 6 visible hills as observations
+    let mut obs: Vec<hill::Hill> = pan.visible[..6].iter().map(|&i| pan.hills[i].clone()).collect();
+    let n = obs.len();
+    let known: Vec<usize> = (0..n).collect();
+    // the C harness copies a_elev explicitly (C copy ctor omits it)
+    for (k, &i) in pan.visible[..6].iter().enumerate() {
+        obs[k].a_elev = pan.hills[i].a_elev;
+    }
+
+    // perturb initial guess
+    pan.set_center_angle(pan.get_center_angle() + 0.5);
+    pan.set_pitch_angle(0.3);
+    pan.set_roll_angle(0.5);
+    pan.set_scale(2800.0);
+
+    let ret = pan.comp_params_with(&obs, &known, true);
+
+    let g_ret: i32 = golden[0]["ret ".len()..].parse().unwrap();
+    assert_eq!(ret.is_ok(), g_ret == 0);
+
+    let g: Vec<f64> = golden[1..8]
+        .iter()
+        .map(|l| l.split_whitespace().nth(1).unwrap().parse().unwrap())
+        .collect();
+
+    let mine = [
+        pan.parms.a_center,
+        pan.parms.a_pitch,
+        pan.parms.a_roll,
+        pan.parms.scale,
+        pan.parms.k0,
+        pan.parms.k1,
+        pan.parms.x0,
+    ];
+    for (m, t) in mine.iter().zip(g.iter()) {
+        // solver results: allow small drift, exact zeros must stay ~zero
+        assert!(
+            (m - t).abs() <= 1e-6f64.max(m.abs() * 1e-6),
+            "fit param {} vs {}",
+            m,
+            t
+        );
+    }
+
+    // final coordinates
+    let proj = gipfel_core::projection::projection_from_type(projtype);
+    for line in &golden[8..] {
+        let parts: Vec<&str> = line.split_whitespace().collect();
+        if parts.len() != 4 {
+            continue;
+        }
+        let i: usize = parts[1].parse().unwrap();
+        let tx: f64 = parts[2].parse().unwrap();
+        let ty: f64 = parts[3].parse().unwrap();
+        let (x, y) = proj.get_coordinates(obs[i].alph, obs[i].a_elev, &pan.parms);
+        assert!(close(x, tx), "hill {} x: {} vs {}", i, x, tx);
+        assert!(close(y, ty), "hill {} y: {} vs {}", i, y, ty);
+    }
+}
+
+#[test]
+fn fit_rectilinear_matches_c() {
+    fit_golden(ProjectionType::Rectilinear, "fit_rect.txt");
+}
+
+#[test]
+fn fit_cylindrical_matches_c() {
+    fit_golden(ProjectionType::Cylindrical, "fit_cyl.txt");
+}
+
+#[test]
+fn real_database_loads() {
+    let Some(data) = data_path() else {
+        eprintln!("gipfel.dat not found, skipping");
+        return;
+    };
+    let hills = hill::load(&data).unwrap();
+    assert!(hills.len() > 21000, "loaded {}", hills.len());
+    assert!(hills.iter().any(|h| h.name == "ZUGSPITZE"));
+}
+
+#[test]
+fn viewpoint_geometry() {
+    let Some(data) = data_path() else {
+        eprintln!("gipfel.dat not found, skipping");
+        return;
+    };
+    let mut pan = Panorama::new();
+    pan.load_data(&data).unwrap();
+    let idx = pan.get_pos("ZUGSPITZE").expect("ZUGSPITZE in db");
+    pan.set_viewpoint(Some(idx));
+
+    // NOTE: set_viewpoint re-sorts hills by azimuth; look the name up again
+    let idx = pan.get_pos("ZUGSPITZE").unwrap();
+    let m = &pan.hills[idx];
+    assert!((m.height - 2963.0).abs() < 1.0);
+    // distance to self is zero
+    assert!(pan.distance(m.phi, m.lam).abs() < 1e-9);
+    // a far hill: Mont Blanc (~45.83 N, 6.86 E)
+    let mb = pan.get_pos("MONT BLANC").expect("MONT BLANC in db");
+    let d = pan.distance(pan.hills[mb].phi, pan.hills[mb].lam);
+    let km = d * 6371000.785 / 1000.0;
+    assert!(km > 340.0 && km < 380.0, "Mont Blanc distance {} km", km);
+}
+
+#[test]
+fn export_hills_matches_c() {
+    let Some(data) = data_path() else {
+        eprintln!("gipfel.dat not found, skipping");
+        return;
+    };
+    let jpg = format!(
+        "{}/../../tests/golden/test.jpg",
+        env!("CARGO_MANIFEST_DIR")
+    );
+    let golden = golden("export.txt");
+
+    let (w, h) = gipfel_core::metadata::image_dimensions(&jpg).expect("test.jpg readable");
+    let mut md = ImageMetaData::new();
+    md.load_image(&jpg);
+
+    let mut pan = Panorama::new();
+    assert!(gipfel_core::metadata::apply_image_metadata(&mut pan, &md, w, h));
+    pan.load_data(&data).unwrap();
+    pan.set_height_dist_ratio(0.07);
+
+    let mut out = vec![
+        "#".to_string(),
+        "# name\theight\tx\ty\tdistance\tflags".to_string(),
+        "#".to_string(),
+    ];
+    out.extend(pan.export_hill_rows(w as i64, h as i64, false));
+
+    assert_eq!(out.len(), golden.len());
+    for (a, b) in out.iter().zip(golden.iter()) {
+        assert_eq!(a, b);
+    }
+}
+
+#[test]
+fn metadata_comment_roundtrip_and_c_format() {
+    let mut md = ImageMetaData::new();
+    md.longitude = 11.1533;
+    md.latitude = 47.3601;
+    md.height = 2100.5;
+    md.direction = 20.0;
+    md.pitch = 0.3;
+    md.roll = 1.0;
+    md.focal_length_35mm = 35.0;
+    md.projection_type = 1;
+    md.k0 = 0.001;
+    md.k1 = -0.0002;
+    md.x0 = 12.0;
+
+    let s = md.format_comment();
+    // exact C printf("%f") compatibility
+    assert_eq!(
+        s,
+        "gipfel: longitude 11.153300, latitude 47.360100, height 2100.500000, direction 20.000000, nick 0.300000, tilt 1.000000, focal_length_35mm 35.000000, projection type 1, k0 0.001000, k1 -0.000200, x0 12.000000"
+    );
+
+    let mut md2 = ImageMetaData::new();
+    assert!(md2.parse_gipfel_comment(s.as_bytes()));
+    assert!((md2.longitude - 11.1533).abs() < 1e-9);
+    assert!((md2.latitude - 47.3601).abs() < 1e-9);
+    assert!((md2.height - 2100.5).abs() < 1e-9);
+    assert!((md2.direction - 20.0).abs() < 1e-9);
+    assert_eq!(md2.projection_type, 1);
+    assert!((md2.k0 - 0.001).abs() < 1e-9);
+    assert!((md2.k1 + 0.0002).abs() < 1e-9);
+    assert!((md2.x0 - 12.0).abs() < 1e-9);
+
+    // short form (8 fields, pre-distortion files): k0/k1/x0 stay NaN
+    let short = b"gipfel: longitude 1.000000, latitude 2.000000, height 3.000000, direction 4.000000, nick 5.000000, tilt 6.000000, focal_length_35mm 7.000000, projection type 0";
+    let mut md3 = ImageMetaData::new();
+    assert!(md3.parse_gipfel_comment(short));
+    assert!(md3.k0.is_nan());
+    assert_eq!(md3.projection_type, 0);
+
+    // trailing garbage after x0 must not break parsing (sscanf semantics)
+    let mut md4 = ImageMetaData::new();
+    let mut s4 = s.clone();
+    s4.push_str("  some other comment junk");
+    assert!(md4.parse_gipfel_comment(s4.as_bytes()));
+    assert!((md4.x0 - 12.0).abs() < 1e-9);
+}
+
+/// The least-squares fit must run on a small stack: the LM solver keeps its
+/// working buffers (residuals, Jacobian, normal equations) on the heap, so a
+/// 128 KiB thread stack is plenty. Guards against regressions that move those
+/// buffers back onto the stack.
+#[test]
+fn fit_survives_small_stack() {
+    let Some(data) = data_path() else {
+        eprintln!("gipfel.dat not found, skipping");
+        return;
+    };
+    std::thread::Builder::new()
+        .stack_size(128 * 1024)
+        .spawn(move || {
+            let mut pan = Panorama::new();
+            pan.load_data(&data).unwrap();
+            pan.set_view_lat(47.36);
+            pan.set_view_long(11.15);
+            pan.set_view_height(2100.0);
+            pan.set_center_angle(20.0);
+            pan.set_pitch_angle(0.0);
+            pan.set_roll_angle(1.0);
+            pan.set_scale(3000.0);
+            let known: Vec<usize> = pan.visible[..4].to_vec();
+            // perturb so the solver actually iterates
+            pan.set_center_angle(20.5);
+            pan.set_scale(2800.0);
+            pan.comp_params(&known, true).unwrap();
+        })
+        .unwrap()
+        .join()
+        .unwrap();
+}
+
+/// Stitch resample against the C Stitch::resample + ScanImage pipeline.
+fn stitch_golden(
+    name: &str,
+    proj: ProjectionType,
+    center: f64,
+    pitch: f64,
+    roll: f64,
+    scale: f64,
+    k0: f64,
+    k1: f64,
+    bicubic: bool,
+) {
+    use gipfel_core::stitch::{self, ScanMode};
+
+    let ppm = format!(
+        "{}/../../tests/golden/stitch.ppm",
+        env!("CARGO_MANIFEST_DIR")
+    );
+    let img = image::open(&ppm)
+        .unwrap_or_else(|e| panic!("missing {}: {e}", ppm))
+        .to_rgb8();
+
+    let mut pan = Panorama::new();
+    pan.set_projection(proj);
+    pan.set_center_angle(center);
+    pan.set_pitch_angle(pitch);
+    pan.set_roll_angle(roll);
+    pan.set_scale(scale);
+    pan.set_distortion_params(k0, k1, 0.0);
+
+    let src = stitch::StitchSource { pan, img };
+    let mode = if bicubic { ScanMode::Bicubic } else { ScanMode::Nearest };
+    let out = stitch::resample(&[src], mode, 64, 48, 10.0, 30.0);
+
+    let mut checked = 0;
+    for line in golden(name) {
+        let f: Vec<&str> = line.split_whitespace().collect();
+        let (x, y, hit): (usize, usize, i32) = (f[0].parse().unwrap(), f[1].parse().unwrap(), f[2].parse().unwrap());
+        let want = [
+            f[3].parse::<u16>().unwrap(),
+            f[4].parse::<u16>().unwrap(),
+            f[5].parse::<u16>().unwrap(),
+        ];
+        let i = y * 64 + x;
+        assert_eq!(out.hit[i], hit == 1, "{name} pixel ({x},{y}) hit flag");
+        assert_eq!(out.pixels[i], want, "{name} pixel ({x},{y})");
+        checked += 1;
+    }
+    assert!(checked > 1000);
+}
+
+#[test]
+fn stitch_rect_nearest_matches_c() {
+    stitch_golden("stitch_rect_near.txt", ProjectionType::Rectilinear, 20.0, 2.0, 0.0, 200.0, 0.0, 0.0, false);
+}
+
+#[test]
+fn stitch_rect_bicubic_matches_c() {
+    stitch_golden("stitch_rect_bic.txt", ProjectionType::Rectilinear, 20.0, 2.0, 0.0, 200.0, 0.0, 0.0, true);
+}
+
+#[test]
+fn stitch_cyl_bicubic_matches_c() {
+    stitch_golden("stitch_cyl_bic.txt", ProjectionType::Cylindrical, 20.0, 2.0, 0.0, 200.0, 0.0, 0.0, true);
+}
+
+#[test]
+fn stitch_distorted_bicubic_matches_c() {
+    stitch_golden("stitch_dist_bic.txt", ProjectionType::Rectilinear, 20.0, 2.0, 3.0, 200.0, -0.3, 0.1, true);
+}
diff --git a/examples/Makefile b/examples/Makefile
deleted file mode 100644
index 062c88c..0000000
--- a/examples/Makefile
+++ /dev/null
@@ -1,63 +0,0 @@
-images    := $(wildcard *.jpg)
-slides    := $(addprefix gipfelweb/slides/, $(images))
-thumbs    := $(addprefix gipfelweb/thumbs/, $(images))
-positions := $(addprefix gipfelweb/gipfel/, $(addsuffix .pos, $(basename $(images))))
-imgpos    := $(addprefix gipfelweb/gipfel/, $(addsuffix .imgs, $(basename $(images))))
-hillpos   := $(addprefix gipfelweb/gipfel/, $(addsuffix .hills, $(basename $(images))))
-html      := $(addprefix gipfelweb/, $(addsuffix .html, $(basename $(images))))
-htmlhills := $(addprefix gipfelweb/hills/, $(addsuffix .html, $(basename $(images))))
-
-all:
-	echo "make gipfelweb - create a HTML based we of gipfel oriented"
-	echo "images in the current directory."
-
-gipfelweb: dirs $(slides) $(thumbs) $(imgpos) $(hillpos) $(html) $(htmlhills)
-
-clean:
-	rm -rf gipfelweb/gipfel
-
-clobber:
-	rm -rf gipfelweb
-
-dirs:
-	mkdir -p gipfelweb/slides
-	mkdir -p gipfelweb/thumbs
-	mkdir -p gipfelweb/hills
-	mkdir -p gipfelweb/gipfel
-
-gipfelweb/slides/%.jpg: %.jpg
-	anytopnm $< | pamscale -f lanczos -xyfit 20000 500 | pnmtojpeg -quality 94 > $@
-	jhead -te $< $@
-
-gipfelweb/thumbs/%.jpg: %.jpg
-	anytopnm $< | pamscale -f point -xyfit 400 50 | pnmtojpeg -quality 80 > $@
-
-gipfelweb/gipfel/%.pos: %.jpg
-	gipfel -p $< > $@
-
-gipfelweb/gipfel/%.imgs: gipfelweb/slides/%.jpg %.opts gipfelweb/gipfel/index.gipfel
-	gipfel `cat $*.opts` -e gipfelweb/gipfel/index.gipfel $< > $@
-
-gipfelweb/gipfel/%.imgs: gipfelweb/slides/%.jpg gipfelweb/gipfel/index.gipfel
-	gipfel -V 0.05 -e gipfelweb/gipfel/index.gipfel $< > $@
-
-gipfelweb/gipfel/%.hills: gipfelweb/slides/%.jpg %.opts
-	gipfel `cat $*.opts` -E $< > $@
-
-gipfelweb/gipfel/%.hills: gipfelweb/slides/%.jpg
-	gipfel -V 0.05 -E $< > $@
-
-gipfelweb/gipfel/index.gipfel: $(positions)
-	cat $(positions) > gipfelweb/gipfel/index.gipfel
-
-gipfelweb/%.html: gipfelweb/slides/%.jpg gipfelweb/gipfel/%.imgs %.title $(thumbs)
-	gipfel2html images "`cat $*.title`" $* > $@
-
-gipfelweb/%.html: gipfelweb/slides/%.jpg gipfelweb/gipfel/%.imgs $(thumbs)
-	gipfel2html images $* $* > $@
-
-gipfelweb/hills/%.html: gipfelweb/slides/%.jpg gipfelweb/gipfel/%.hills %.title
-	gipfel2html hills "`cat $*.title`" $* > $@
-
-gipfelweb/hills/%.html: gipfelweb/slides/%.jpg gipfelweb/gipfel/%.hills
-	gipfel2html hills $* $*  > $@
diff --git a/examples/gipfel2html b/examples/gipfel2html
deleted file mode 100755
index c8df477..0000000
--- a/examples/gipfel2html
+++ /dev/null
@@ -1,136 +0,0 @@
-#!/bin/sh
-
-MODE="$1"
-TITLE="$2"
-FILE="$3"
-
-if [ "$MODE" = "images" ]; then
-	DATAFILE="gipfelweb/gipfel/${FILE}.imgs"
-else
-	DATAFILE="gipfelweb/gipfel/${FILE}.hills"
-fi
-
-cat << EOF
-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
-<html>
-<head>
-EOF
-
-echo "<title>$TITLE</title>"
-
-cat << EOF
-<style type="text/css">
-#gipfel { display: block; position: relative; margin: 0; padding: 0; }
-#gipfel li { visibility: hidden; list-style-type: none; position: absolute; background: url(25w.png); border: 1px solid black; font-family: sans-serif; font-size: x-small; color: #000; padding: 0; line-height: 1.3em; overflow: hidden; }
-#gipfel span { visibility: hidden; position: absolute; left: 0; right: 0; display: block; padding: 5px; }
-#gipfel:hover li { visibility: visible; }
-#gipfel li:hover span {visibility: visible;}
-EOF
-
-IFS="	"
-i=0
-grep -v "^#" ${DATAFILE} | \
-while read name height x y dist flags dummy; do
-	if [ "$MODE" = "images" ]; then
-		thumb_w=`identify -format %w gipfelweb/thumbs/${name}`
-		thumb_h=`identify -format %h gipfelweb/thumbs/${name}`
-
-		echo "#id_${i} {left:$((${x} - 10 / 2))px; top: $((${y} - 6 / 2))px; width: 10px; height: 6px;}"
-		echo "#id_${i}:hover {width: ${thumb_w}px; height: ${thumb_h}px; background: url(thumbs/${name});}"
-	else
-		echo "#id_${i} {left:$((${x} - 4 / 2))px; top: $((${y} - 4 / 2))px; width: 4px; height: 4px;}"
-		echo "#id_${i}:hover {width: 200px; height: 20px;}"
-	fi
-
-	i=$((${i} + 1))
-done
-
-cat << EOF
-</style></head>
-<body bgcolor="#919faa">
-<br/>
-<br/>
-EOF
-
-echo "<h3>$TITLE</h3>"
-
-if [ "$MODE" = "images" ]; then
-	echo "<a href=\"hills/${FILE}.html\">show hill names</a>"
-else
-	echo "<a href=\"../${FILE}.html\">back to gipfelweb</a>"
-fi
-
-cat << EOF
-<table border="0" cellpadding="0" cellspacing="1" bgcolor="black">
-<tr><td>
-<table border="0" cellpadding="10" cellspacing="0" bgcolor="white">
-<tr><td>
-<div id="gipfel">
-EOF
-
-if [ "$MODE" = "images" ]; then
-	echo "<img src=\"slides/${FILE}.jpg\"/>"
-else
-	echo "<img src=\"../slides/${FILE}.jpg\"/>"
-fi
-
-
-echo "<ul>"
-i=0
-grep -v "^#" ${DATAFILE} | \
-while read name height x y dist flags dummy; do
-	if [ "$MODE" = "images" ]; then
-		THUMB_TITLE="${name%.jpg}"
-		if [ -e "${name%.jpg}.title" ]; then
-			THUMB_TITLE=`cat ${name%.jpg}.title`
-		fi
-		echo "<li id=\"id_${i}\"><a href=\"${name%.jpg}.html\"><span>${THUMB_TITLE} (${height}m)</span></a></li>"
-	else
-		echo "<li id=\"id_${i}\"><span>${name} (${height}m)</span></li>"
-	fi
-
-	i=$((${i} + 1))
-done
-echo "</ul>"
-
-cat << EOF
-</div>
-</td></tr>
-</table>
-</td></tr>
-</table>
-<br/>
-<b>Created with <a href="http://www.ecademix.com/JohannesHofmann/gipfel.html">gipfel</a></b>
-<br/>
-<br/>
-EOF
-
-if [ "$MODE" = "images" ]; then
-	echo Move the mouse over the image to see other images.
-else
-	echo Move the mouse over the image to see known mountains.
-fi
-
-cat << EOF
-<br/>
-Move the mouse over the rectangle to see details.
-<br/>
-<br/>
-This image is visible on these images:<br/>
-EOF
-
-grep -l ${FILE} gipfelweb/gipfel/*.imgs | \
-while read f; do
-	img="`basename ${f%.imgs}`"
-	if [ "$MODE" = "images" ]; then
-		echo "<a href=\"${img}.html\"><img src=\"thumbs/${img}.jpg\"></a><br/>"
-	else
-		echo "<a href=\"../${img}.html\"><img src=\"../thumbs/${img}.jpg\"></a><br/>"
-	fi
-done
-
-
-cat << EOF
-</body>
-</html>
-EOF
diff --git a/gipfel.spec b/gipfel.spec
deleted file mode 100644
index eed33bb..0000000
--- a/gipfel.spec
+++ /dev/null
@@ -1,56 +0,0 @@
-Name: gipfel
-Summary: gipfel - Photogrammetry For Mountain Images
-Version: 0.4.0
-Release: 4.0
-URL: http://www.ecademix.com/JohannesHofmann/gipfel.html
-BuildRoot:      %{_tmppath}/%{name}-%{version}-build
-Source0: %{name}-%{version}.tar.gz
-License: GPL
-Group: Productivity/Scientific/Other
-
-BuildRequires: binutils gcc gcc-c++ libstdc++-devel gsl-devel fltk-devel libjpeg-devel libtiff-devel libpng-devel
-
-%if 0%{?fedora_version}
-BuildRequires: exiv2-devel
-%else
-BuildRequires: libexiv2-devel
-%endif
-
-%if 0%{?suse_version}
-BuildRequires: xorg-x11-libXext-devel
-%endif
-
-%description
-gipfel helps to find the names of mountains or points of interest
-on a picture.
-It uses a database containing names and GPS data. With the given viewpoint
-(the point from which the picture was taken) and two known mountains
-on the picture, gipfel can compute all parameters needed to compute the
-positions of other mountains on the picture.
-gipfel can also be used to play around with the parameters manually.
-%prep
-%setup -q
-%build
-./configure --prefix=%{_prefix} --docdir=%{_defaultdocdir}/%{name} || cat config.log
-make
-%install
-make DESTDIR=$RPM_BUILD_ROOT install-strip
-rm -rf $RPM_BUILD_ROOT/%{_defaultdocdir}/%{name}
-%files
-%defattr(-, root, root)
-%doc NEWS README
-%{_bindir}/%{name}
-%dir %{_datadir}/%{name}
-%{_datadir}/%{name}/gipfel.dat
-
-%changelog
-* Fri  Jan 17 2014 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-- update to gipfel-0.4.0
-* Thu Jul 2 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-- update to gipfel-0.3.2
-* Tue Apr 7 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-- update to gipfel-0.3.1
-* Thu Mar 26 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-- update to gipfel-0.2.9
-* Sun Mar 22 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-- initial revision
diff --git a/src/Fl_Search_Chooser.H b/src/Fl_Search_Chooser.H
deleted file mode 100644
index 37ed431..0000000
--- a/src/Fl_Search_Chooser.H
+++ /dev/null
@@ -1,42 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef FL_SEARCH_CHOOSER_H
-#define FL_SEARCH_CHOOSER_H
-
-#include <FL/Fl_Window.H>
-#include <FL/Fl_Select_Browser.H>
-#include <FL/Fl_Input.H>
-
-class Fl_Search_Browser : public Fl_Select_Browser {
-	private:
-		int find_prefix(const char *p, int s, int e);
-
-	public:
-		Fl_Search_Browser(int X, int Y, int W, int H, const char *c):Fl_Select_Browser(X,Y,W,H,c){};
-
-		int find_prefix(const char *p);
-};
-
-class Fl_Search_Chooser : public Fl_Window {
-	private:
-		Fl_Search_Browser *sb;
-		int visible_focus;
-	
-		static void input_cb(Fl_Input* in, void*c);	
-		static void ok_cb(Fl_Input* in, void*c);	
-		static void cancel_cb(Fl_Input* in, void*c);	
-
-	public:
-		Fl_Search_Chooser(const char *title);
-
-		void close();
-		void add(const char *t, void *d);
-		void *data();
-		int handle(int event);
-};
-
-#endif
diff --git a/src/Fl_Search_Chooser.cxx b/src/Fl_Search_Chooser.cxx
deleted file mode 100644
index 286516c..0000000
--- a/src/Fl_Search_Chooser.cxx
+++ /dev/null
@@ -1,137 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <string.h>
-#include <FL/Fl.H>
-#include <FL/Fl_Window.H>
-#include <FL/Fl_Button.H>
-#include "Fl_Search_Chooser.H"
-
-int
-Fl_Search_Browser::find_prefix(const char *p) {
-	int i = find_prefix(p, 1, size());
-	if (i == -1) {
-		return 1;
-	} else {
-		deselect();
-		middleline(i);
-		select(i);
-		return 0;
-	}
-}
-
-int
-Fl_Search_Browser::find_prefix(const char *p, int s, int e) {
-	if (s < 0 || e > size() || s > e) {
-		fprintf(stderr, "Invalid search range %d %d\n", s, e);
-		return 1;
-	} else if (e - s <= 1) {
-		if (strncasecmp(p, text(s), strlen(p)) == 0) {
-			return s;
-		} else if (strncasecmp(p, text(e), strlen(p)) == 0){
-			return e;
-		} else {
-			return -1;
-		}
-	} else {
-		int med = s + (e - s) / 2;
-		if (strncasecmp(p, text(med), strlen(p)) > 0) {
-			return find_prefix(p, med, e);
-		} else {
-			return find_prefix(p, s, med);
-		}
-	}
-} 
-
-void
-Fl_Search_Chooser::input_cb(Fl_Input* in, void*c) {
-	Fl_Search_Browser *sb = ((Fl_Search_Chooser *) c)->sb;
-	sb->find_prefix(in->value()); 
-}    
-
-void
-Fl_Search_Chooser::ok_cb(Fl_Input* in, void*c) {
-	Fl_Search_Chooser *sc = (Fl_Search_Chooser *) c;
-	sc->close();
-} 
-
-void
-Fl_Search_Chooser::cancel_cb(Fl_Input* in, void*c) {
-	Fl_Search_Chooser *sc = (Fl_Search_Chooser *) c;
-	sc->sb->deselect();
-	sc->close();
-}
-
-class Fl_Search_Input : public Fl_Input {
-	public:
-		Fl_Search_Input(int x, int y, int w, int h, const char *title) :
-			Fl_Input(x, y, w, h, title) {}
-		int handle(int event) {
-			if (event == FL_KEYBOARD &&
-			    (Fl::event_key() == FL_Up || Fl::event_key() == FL_Down)) {
-				return 0;
-			} else {
-				return Fl_Input::handle(event);
-			}
-	}
-};
-
-Fl_Search_Chooser::Fl_Search_Chooser(const char *title) : Fl_Window(320, 320, title?title:"Choose") {
-	callback((Fl_Callback*) cancel_cb, this);
-	visible_focus = Fl::visible_focus();
-	Fl::visible_focus(0);
-	Fl_Group *g = new Fl_Group(10, 10, w() - 10, h() - 10);
-	sb = new Fl_Search_Browser(g->x(), g->y(), g->w() , g->h() - 100, NULL);
-	sb->type(FL_HOLD_BROWSER);
-	Fl_Input *in = new Fl_Search_Input(g->x()+50, g->h()-80, g->w()-80, 20, "Search");
-	in->callback((Fl_Callback*) input_cb, this);
-	in->when(FL_WHEN_CHANGED);
-	Fl_Button *cancel_b = new Fl_Button(g->w()-200, g->h()-30, 80, 25, "Cancel");
-	cancel_b->callback((Fl_Callback*) cancel_cb, this);
-	Fl_Button *ok_b = new Fl_Button(g->w()-100, g->h()-30, 80, 25, "Ok");
-	ok_b->callback((Fl_Callback*) ok_cb, this);
-	Fl::focus(in);
-	g->end();
-	end();
-}
-
-void
-Fl_Search_Chooser::close() {
-	hide();
-	Fl::visible_focus(visible_focus);
-}
-
-void
-Fl_Search_Chooser::add(const char *t, void *d) {
-	sb->add(t, d);
-}
-
-void *
-Fl_Search_Chooser::data() {
-	int v = sb->value();
-	if (v) {
-		return sb->data(v);
-	} else {
-		return NULL;
-	}
-}
-
-int
-Fl_Search_Chooser::handle(int event) {
-	switch(event) {
-		case FL_KEYBOARD:
-			int key = Fl::event_key();
-
-			if (key == FL_Up || key == FL_Down) {
-				return sb->handle(event);
-			} else if (key == FL_Enter) {
-				close();
-			}
-	}
-
-	return Fl_Window::handle(event);
-}
diff --git a/src/Fl_Value_Dial.H b/src/Fl_Value_Dial.H
deleted file mode 100644
index aa09407..0000000
--- a/src/Fl_Value_Dial.H
+++ /dev/null
@@ -1,29 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef Fl_Value_Dial_H
-#define Fl_Value_Dial_H
-
-#include <FL/Fl_Dial.H>
-
-class Fl_Value_Dial : public Fl_Dial {
-	private:
-		uchar textfont_, textsize_;
-		unsigned textcolor_;
-	public:
-		void draw();
-		int handle(int event);
-
-		Fl_Value_Dial(int x,int y,int w,int h, const char *l = 0);
-		Fl_Font textfont() const {return (Fl_Font)textfont_;}
-		void textfont(uchar s) {textfont_ = s;}
-		uchar textsize() const {return textsize_;}
-		void textsize(uchar s) {textsize_ = s;}
-		Fl_Color textcolor() const {return (Fl_Color)textcolor_;}
-		void textcolor(unsigned s) {textcolor_ = s;}
-};
-
-#endif
diff --git a/src/Fl_Value_Dial.cxx b/src/Fl_Value_Dial.cxx
deleted file mode 100644
index 9b54458..0000000
--- a/src/Fl_Value_Dial.cxx
+++ /dev/null
@@ -1,67 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <FL/Fl.H>
-#include <FL/fl_draw.H>
-#include <math.h>
-#include "Fl_Value_Dial.H"
-
-Fl_Value_Dial::Fl_Value_Dial(int X, int Y, int W, int H, const char*l)
-	: Fl_Dial(X,Y,W,H,l)
-{
-	step(1,100);
-	textfont_ = FL_HELVETICA;
-	textsize_ = 10;
-	textcolor_ = FL_BLACK;
-}
-
-void Fl_Value_Dial::draw() {
-	int sxx = x(), syy = y(), sww = w(), shh = h();
-	int bxx = x(), byy = y(), bww = w(), bhh = h();
-	char buf[128];
-
-	if (damage()&FL_DAMAGE_ALL) draw_box(box(),sxx,syy,sww,shh,color());
-	Fl_Dial::draw(sxx+Fl::box_dx(box()),
-		syy+Fl::box_dy(box()),
-		sww-Fl::box_dw(box()),
-		shh-Fl::box_dh(box()));
-
-	format(buf); // prints at most 20 chars
-	fl_font(textfont(), textsize());
-
-	fl_color(active_r() ? textcolor() : fl_inactive(textcolor()));
-	fl_draw(buf, bxx, byy + fl_height() - 2, bww, bhh, FL_ALIGN_TOP);
-}
-
-int Fl_Value_Dial::handle(int event) {  
-	switch (event) {
-		case FL_KEYBOARD :
-			switch (Fl::event_key()) {
-				case FL_Left:
-					handle_drag(clamp(increment(value(),-1)));
-					handle_release();
-					return 1;
-				case FL_Right:
-					handle_drag(clamp(increment(value(),1)));
-					handle_release();
-					return 1;
-				default:
-					return 0;
-			}
-			break; 
-		case FL_FOCUS :
-		case FL_UNFOCUS :
-			if (Fl::visible_focus()) {
-				redraw();
-				return 1;
-			} else return 0;
-		case FL_ENTER :
-		case FL_LEAVE :
-			return 1;
-		default:
-			return Fl_Dial::handle(event);
-	}
-}
diff --git a/src/GipfelWidget.H b/src/GipfelWidget.H
deleted file mode 100644
index db67d5e..0000000
--- a/src/GipfelWidget.H
+++ /dev/null
@@ -1,93 +0,0 @@
-//
-// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef GipfelWidget_H
-#define GipfelWidget_H
-
-#include <stdio.h>
-
-#include <FL/Fl_Group.H>
-#include <FL/Fl_Menu_Button.H>
-
-#include "Panorama.H"
-#include "ImageMetaData.H"
-#include "ScanImage.H"
-
-class GipfelWidget : public Fl_Group {
-	private:
-		Fl_Image *img;
-		Hill *cur_mountain, *focused_mountain;
-		Hills *track_points;
-		Hills *known_hills;
-		Panorama *pan;
-		char *img_file;
-		double track_width;
-		bool have_gipfel_info;
-		bool show_hidden;
-		ImageMetaData *md;
-		int mouse_x, mouse_y;
-		char focused_mountain_label[128];
-		void (*params_changed_cb)();
-
-		int handle(int event);
-		Hill * find_mountain(Hills *mnts, int m_x, int m_y);
-		int toggle_known_mountain(int m_x, int m_y);
-		int set_mountain(int m_x, int m_y);
-		void set_labels(Hills *v);
-		int get_rel_track_width(Hill *m);
-
-		static void find_peak_cb(Fl_Widget *o, void *f);
-		static void toggle_hidden_cb(Fl_Widget *o, void *f);
-
-	public:
-		GipfelWidget(int X,int Y,int W, int H, void (*changed_cb)());
-
-		int load_image(char *file);
-		int save_image(char *file);
-		int export_hills(const char *file, FILE *fp);
-		const char * get_image_filename();
-		int load_data(const char *file);
-		int load_track(const char *file);
-		int set_viewpoint(const char *pos);
-		void set_viewpoint(const Hill *m);
-		void set_center_angle(double a);
-		void set_nick_angle(double a);
-		void set_tilt_angle(double a);
-		void set_focal_length_35mm(double s);
-		void set_height_dist_ratio(double r);
-		void set_hide_value(double h);
-		void set_show_hidden(bool h);
-		void set_view_lat(double v);
-		void set_view_long(double v);
-		void set_view_height(double v);
-		const char * get_viewpoint() { return pan->get_viewpoint(); };
-		double get_center_angle() { return pan->get_center_angle(); };
-		double get_nick_angle() { return pan->get_nick_angle(); };
-		double get_tilt_angle() { return pan->get_tilt_angle(); };
-		double get_focal_length_35mm();
-		double get_height_dist_ratio() { return pan->get_height_dist_ratio(); };
-		double get_view_lat() { return pan->get_view_lat(); };
-		double get_view_long() { return pan->get_view_long(); };
-		double get_view_height() { return pan->get_view_height(); };
-		void set_track_width(double w);
-		ProjectionLSQ::Projection_t projection() {
-			return pan->get_projection();
-		};
-		void projection(ProjectionLSQ::Projection_t p);
-		void get_distortion_params(double *k0, double *k1, double *x0) {
-			pan->get_distortion_params(k0, k1, x0);
-		};
-		void set_distortion_params(double k0, double k1, double x0);
-		Hills *get_mountains() { return pan->get_mountains(); };
-		int comp_params();
-		int get_pixel(ScanImage::mode_t m,
-			double a_alph, double a_nick, int *r, int *g, int *b);
-		int get_distortion_profile_name(char *buf, int buflen);
-		int save_distortion_params(const char *prof_name, int force);
-		int load_distortion_params(const char *prof_name);
-		void draw();
-};
-#endif
diff --git a/src/GipfelWidget.cxx b/src/GipfelWidget.cxx
deleted file mode 100644
index 30172a1..0000000
--- a/src/GipfelWidget.cxx
+++ /dev/null
@@ -1,822 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <math.h>
-#include <algorithm>
-
-#include <FL/Fl.H>
-#include <FL/Fl_Menu_Item.H>
-#include <FL/Fl_Shared_Image.H>
-#include <FL/Fl_JPEG_Image.H>
-#include <FL/Fl_Preferences.H>
-#include <FL/fl_draw.H>
-
-#include "Fl_Search_Chooser.H"
-#include "choose_hill.H"
-#include "ScanImage.H"
-#include "GipfelWidget.H"
-
-#define CROSS_SIZE 2
-
-static double pi_d, deg2rad;
-
-GipfelWidget::GipfelWidget(int X,int Y,int W, int H, void (*changed_cb)()): Fl_Group(X, Y, W, H) {
-	end();
-	pi_d = asin(1.0) * 2.0;
-	deg2rad = pi_d / 180.0;
-	img = NULL;
-	pan = new Panorama();
-	cur_mountain = NULL;
-	focused_mountain = NULL;
-	known_hills = new Hills();
-	img_file = NULL;
-	track_width = 200.0;
-	show_hidden = false;
-	have_gipfel_info = false;
-	md = new ImageMetaData();
-	track_points = NULL;
-	fl_register_images();
-	mouse_x = mouse_y = 0;
-	params_changed_cb = changed_cb;
-}
-
-int
-GipfelWidget::load_image(char *file) {
-	Fl_Image *new_img;
-	double direction, nick, tilt, fl;
-
-	new_img = new Fl_JPEG_Image(file);
-
-	if (new_img == NULL)
-		return 1;
-
-	if (img)
-		delete img;
-
-	img = new_img;
-
-	if (img_file)
-		free(img_file);
-
-	img_file = strdup(file);
-
-	known_hills->clear();
-
-	h(img->h());  
-	w(img->w());  
-
-	// try to retrieve gipfel data from JPEG meta data
-	md->load_image(file);
-	set_view_long(md->longitude());
-	set_view_lat(md->latitude());
-	set_view_height(md->height());
-	projection((ProjectionLSQ::Projection_t) md->projection_type());
-
-	have_gipfel_info = true;
-	direction = md->direction();
-	if (isnan(direction)) {
-		set_center_angle(0.0);
-		have_gipfel_info = false;
-	} else {
-		set_center_angle(direction);
-	}
-
-	nick = md->nick();
-	if (isnan(nick)) {
-		set_nick_angle(0.0);
-		have_gipfel_info = false;
-	} else {
-		set_nick_angle(nick);
-	}
-
-	tilt = md->tilt();
-	if (isnan(tilt)) {
-		set_tilt_angle(0.0);
-		have_gipfel_info = false;
-	} else {
-		set_tilt_angle(tilt);
-	}
-
-	fl = md->focal_length_35mm();
-	if (isnan(fl) || fl == 0.0) {
-		set_focal_length_35mm(35.0);
-		have_gipfel_info = false;
-	} else {
-		set_focal_length_35mm(fl);
-	}
-	
-	// try to get distortion parameters in the following ordering:
-	// 1. gipfel data in JPEG comment
-	// 2. matching distortion profile
-	// 3. set the to 0.0, 0.0
-	md->distortion_params(&pan->parms.k0, &pan->parms.k1, &pan->parms.x0);
-	if (isnan(pan->parms.k0)) {
-		char buf[1024];
-		if (get_distortion_profile_name(buf, sizeof(buf)) == 0)
-			load_distortion_params(buf);
-
-		if (isnan(pan->parms.k0))
-			pan->parms.k0 = 0.0;
-		if (isnan(pan->parms.k1))
-			pan->parms.k1 = 0.0;
-		if (isnan(pan->parms.x0))
-			pan->parms.x0 = 0.0;
-	}
-
-	return 0;
-}
-
-const char *
-GipfelWidget::get_image_filename() {
-	return img_file;
-}
-
-int
-GipfelWidget::save_image(char *file) {
-	if (img_file == NULL) {
-		fprintf(stderr, "Nothing to save\n");
-		return 1;
-	}
-
-	md->longitude(get_view_long());
-	md->latitude(get_view_lat());
-	md->height(get_view_height());
-	md->direction(get_center_angle());
-	md->nick(get_nick_angle());
-	md->tilt(get_tilt_angle());
-	md->focal_length_35mm(get_focal_length_35mm());
-	md->projection_type((int) projection());
-	md->distortion_params(pan->parms.k0, pan->parms.k1, pan->parms.x0);
-
-	return  md->save_image(img_file, file);
-}
-
-int
-GipfelWidget::load_data(const char *file) {
-	int r;
-
-	r = pan->load_data(file);
-	set_labels(pan->get_visible_mountains());
-
-	return r;
-}
-
-int
-GipfelWidget::load_track(const char *file) {
-	if (track_points) {
-		pan->remove_hills(Hill::TRACK_POINT);
-		track_points->clobber();
-		delete track_points;
-	}
-
-	track_points = new Hills();
-
-	if (track_points->load(file) != 0) {
-		delete track_points;
-		track_points = NULL;
-		return 1;
-	}
-
-	for (int i = 0; i < track_points->get_num(); i++)
-		track_points->get(i)->flags |= Hill::TRACK_POINT;
-
-	pan->add_hills(track_points);  
-	redraw();
-
-	return 0;
-}
-
-int
-GipfelWidget::set_viewpoint(const char *pos) {
-	int r;
-
-	r = pan->set_viewpoint(pos);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-	return r;
-}
-
-void
-GipfelWidget::set_viewpoint(const Hill *m) {
-	pan->set_viewpoint(m);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-static void
-draw_flag(int x, int y) {
-	fl_polygon(x, y - 10, x, y - 20, x + 10, y - 15);
-	fl_yxline(x, y, y - 10);
-	fl_circle(x , y, 3);
-}
-
-void 
-GipfelWidget::draw() {
-	Hills *mnts;
-	Hill *m;
-	int i, height;
-
-	if (img == NULL)
-		return;
-
-	fl_push_clip(x(), y(), w(), h());
-	img->draw(x(),y(),w(),h(),0,0);
-
-	/* hills */
-	fl_font(FL_HELVETICA, 8);
-	mnts = pan->get_visible_mountains();
-
-	fl_color(FL_YELLOW);
-	height = fl_height();
-	for (i=0; i<mnts->get_num(); i++) {
-		m = mnts->get(i);
-		int m_x = w() / 2 + x() + (int) rint(m->x);
-		int m_y = h() / 2 + y() + (int) rint(m->y);
-
-		if ((m->flags & (Hill::DUPLIC|Hill::TRACK_POINT)) ||
-			(!show_hidden && (m->flags & Hill::HIDDEN)) ||
-			known_hills->contains(m) || m == focused_mountain)
-			continue;
-
-		if (fabs(m->x) > img->w() / 2 || fabs(m->y) > img->h() / 2)
-			continue;
-
-		fl_xyline(m_x - CROSS_SIZE, m_y, m_x + CROSS_SIZE);
-		fl_yxline(m_x, m_y + m->label_y - height, m_y + CROSS_SIZE);
-		fl_xyline(m_x, m_y + m->label_y - height, m_x + m->label_x);
-	}
-
-	for (i=0; i<mnts->get_num(); i++) {
-		m = mnts->get(i);
-		int m_x = w() / 2 + x() + (int) rint(m->x);
-		int m_y = h() / 2 + y() + (int) rint(m->y);
-
-		if ((m->flags & (Hill::DUPLIC|Hill::TRACK_POINT)) ||
-			(!show_hidden && (m->flags & Hill::HIDDEN)) || m == focused_mountain)
-			continue;
-
-		if (fabs(m->x) > img->w() / 2 || fabs(m->y) > img->h() / 2)
-			continue;
-
-		if (known_hills->contains(m)) {
-			if (known_hills->get_num() > 3)
-				fl_color(FL_GREEN);
-			else
-				fl_color(FL_RED);
-
-			draw_flag(m_x, m_y);
-			fl_color(FL_BLACK);
-		} else if (m->flags & Hill::HIDDEN) {
-			fl_color(FL_BLUE);
-		} else {
-			fl_color(FL_BLACK);
-		}
-
-		fl_draw(m->name, m_x + 2, m_y + m->label_y);
-	}
-
-	if (focused_mountain) {
-		m = focused_mountain;
-		int m_x = w() / 2 + x() + (int) rint(m->x);
-		int m_y = h() / 2 + y() + (int) rint(m->y);
-
-		fl_color(FL_YELLOW);
-
-		fl_rectf(m_x, m_y - height,
-			(int) fl_width(focused_mountain_label) + 2, height + 2);
-		fl_color(FL_BLACK);
-  		fl_draw(focused_mountain_label, m_x, m_y);
-	}
-	
-
-	/* track */
-	if (track_points && track_points->get_num() > 0) {
-		int last_x = 0, last_y = 0, last_initialized = 0;
-
-		for (i=1; i<track_points->get_num(); i++) {
-			m = track_points->get(i);
-			int m_x = w() / 2 + x() + (int) rint(m->x);
-			int m_y = h() / 2 + y() + (int) rint(m->y);
-
-			if (!(track_points->get(i)->flags & Hill::VISIBLE))
-				continue;
-
-			if (track_points->get(i)->flags & Hill::HIDDEN)
-				fl_color(FL_BLUE);
-			else
-				fl_color(FL_RED);
-
-			fl_line_style(FL_SOLID | FL_CAP_ROUND | FL_JOIN_ROUND,
-				get_rel_track_width(track_points->get(i)));
-			if (last_initialized) {
-				fl_begin_line();
-				fl_vertex(last_x, last_y);
-				fl_vertex(m_x, m_y);
-				fl_end_line();
-			}
-
-			last_x = m_x;
-			last_y = m_y;
-			last_initialized++;
-		}
-		fl_line_style(0);
-	}
-
-	fl_pop_clip();
-}
-
-static int 
-overlap(double x1, double l1, double x2, double l2) {
-	return x1 <= x2 + l2 && x1 + l1 >= x2;
-}
-
-void 
-GipfelWidget::set_labels(Hills *v) {
-	int height;
-
-	if (!img)
-		return;
-
-
-	fl_font(FL_HELVETICA, 8);
-	height = fl_height();
-
-	for (int i = 0; i < v->get_num(); i++) {
-		Hill *m = v->get(i);
-		Hills colliding;
-
-		if (m->flags & (Hill::DUPLIC | Hill::TRACK_POINT))
-			continue;
-
-		if (!show_hidden && (m->flags & Hill::HIDDEN))
-			continue;
-
-		if (fabs(m->x) > img->w() / 2 || fabs(m->y) > img->h() / 2)
-			continue;
-
-		m->label_x = (int) fl_width(m->name) + 1;
-		m->label_y = 0;
-
-		for (int j = i - 1; j >= 0; j--) {
-			Hill *n = v->get(j);
-
-			if (n->flags & (Hill::DUPLIC | Hill::TRACK_POINT))
-				continue;
-
-			if (!show_hidden && (n->flags & Hill::HIDDEN))
-				continue;
-
-			if (fabs(m->x) > img->w() / 2 || fabs(m->y) > img->h() / 2)
-				continue;
-
-			if (overlap(m->x, m->label_x, n->x - CROSS_SIZE, n->label_x))
-				colliding.add(n);
-			else
-				break;
-		}
-
-		colliding.sort(Hills::SORT_LABEL_Y);
-
-		for (int j = 0; j < colliding.get_num(); j++) {
-			Hill *n = colliding.get(j);
-
-			// Check for overlapping labels and
-			// overlaps between labels and peak markers
-			if (overlap(m->y + m->label_y - height, height,
-					n->y + n->label_y - height, height) ||
-				overlap(m->y + m->label_y - height,
-					height, n->y - CROSS_SIZE, 2 * CROSS_SIZE)) {
-
-				m->label_y = (int) rint(n->y + n->label_y - m->y - height - 2);
-			}
-		}
-	}
-}
-
-Hill *
-GipfelWidget::find_mountain(Hills *mnts, int m_x, int m_y) {
-    Hill *m;
-    int center_x = w() / 2;
-    int center_y = h() / 2;
-
-    for (int i = 0; i < mnts->get_num(); i++) {
-        m = mnts->get(i);
-
-        if (m_x - center_x >= m->x - 2 && m_x - center_x < m->x + 2 &&
-            m_y - center_y >= m->y - 2 && m_y - center_y < m->y + 2)
-			return m;
-	}
-
-	return NULL;
-}
-
-int
-GipfelWidget::toggle_known_mountain(int m_x, int m_y) {
-	Hills *mnts = pan->get_visible_mountains();
-	int center_x = w() / 2;
-	int center_y = h() / 2;
-
-	for (int i = 0; i < mnts->get_num(); i++) {
-		Hill *m = mnts->get(i); 
-
-		if (m->flags & (Hill::DUPLIC | Hill::TRACK_POINT))
-			continue;
-
-		if (m_x - center_x >= m->x - 2 && m_x - center_x < m->x + 2 &&
-			m_y - center_y >= m->y - 2 && m_y - center_y < m->y + 2) {
-
-
-			if (known_hills->contains(m))
-				known_hills->remove(m);
-			else
-				known_hills->add(m);
-
-			redraw();
-			return 0;
-		}
-	}
-
-	cur_mountain = NULL;
-	redraw();
-	return 1;
-}
-
-int
-GipfelWidget::set_mountain(int m_x, int m_y) {
-	int old_x, old_y, old_label_y;
-	int center_x = w() / 2;
-	int center_y = h() / 2;
-
-	if (!cur_mountain)
-		return 1;
-
-	old_x = (int) rint(cur_mountain->x);
-	old_y = (int) rint(cur_mountain->y);
-	old_label_y = cur_mountain->label_y;
-
-	cur_mountain->x = m_x - center_x;
-	cur_mountain->y = m_y - center_y;
-	cur_mountain->label_y = 0;
-
-	damage(4, center_x + x() + old_x - 2*CROSS_SIZE - 1,
-		center_y + y() + old_y + old_label_y - 2*CROSS_SIZE - 20,
-		std::max(20, cur_mountain->label_x) + 2*CROSS_SIZE + 4,
-		std::max(20, old_label_y) + 22 ); 
-	damage(4,
-		(int) rint(center_x + x() + cur_mountain->x - 2*CROSS_SIZE - 1),
-		(int) rint(center_y + y() + cur_mountain->y + cur_mountain->label_y - 2*CROSS_SIZE - 20),
-		std::max(20, cur_mountain->label_x) + 2*CROSS_SIZE + 4,
-		std::max(20, cur_mountain->label_y) + 22 ); 
-
-	return 0;
-}
-
-void
-GipfelWidget::set_center_angle(double a) {
-	pan->set_center_angle(a);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_nick_angle(double a) {
-	pan->set_nick_angle(a);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_tilt_angle(double a) {
-	pan->set_tilt_angle(a);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_focal_length_35mm(double s) {
-	int w = std::max(img->w(), img->h()); // assume sensor is wider than high
-	pan->set_scale(s * (double) w / 35.0);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::projection(ProjectionLSQ::Projection_t p) {
-	pan->set_projection(p);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_distortion_params(double k0, double k1, double x0) {
-	pan->set_distortion_params(k0, k1, x0);
-	redraw();
-}
-
-double
-GipfelWidget::get_focal_length_35mm() {
-	int w;
-
-	if (img == NULL)
-		return NAN;
-	
-	w = std::max(img->w(), img->h()); // assume sensor is wider than high
-	return pan->get_scale() * 35.0 / (double) w;
-}
-
-void 
-GipfelWidget::find_peak_cb(Fl_Widget *, void *f) {
-	GipfelWidget *g = (GipfelWidget*) f;
-
-	Hill *m = choose_hill(g->pan->get_close_mountains(), "Find Peak");
-	if (m) {
-		if (!g->known_hills->contains(m))
-			g->known_hills->add(m);
-
-		m->flags |= Hill::VISIBLE;
-		if (! g->pan->get_visible_mountains()->contains(m))
-			g->pan->get_visible_mountains()->add(m);
-		g->set_labels(g->pan->get_visible_mountains());
-
-		g->cur_mountain = m;
-		g->set_mountain(g->mouse_x, g->mouse_y);
-		g->comp_params();
-	}
-}
-
-void 
-GipfelWidget::toggle_hidden_cb(Fl_Widget *, void *f) {
-	GipfelWidget *g = (GipfelWidget*) f;
-
-	Hill *m = g->find_mountain(g->pan->get_visible_mountains(), g->mouse_x, g->mouse_y);
-	if (!m)
-		return;
-
-	if (m->flags & Hill::HIDDEN)
-		m->flags &= ~Hill::HIDDEN;
-	else
-		m->flags |= Hill::HIDDEN;
-
-	g->set_labels(g->pan->get_visible_mountains());
-	g->redraw();
-}
-
-void
-GipfelWidget::set_height_dist_ratio(double r) {
-	pan->set_height_dist_ratio(r);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_hide_value(double h) {
-	pan->set_hide_value(h);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_show_hidden(bool h) {
-	show_hidden = h;
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_view_lat(double v) {
-	pan->set_view_lat(v);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_view_long(double v) {
-	pan->set_view_long(v);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-void
-GipfelWidget::set_view_height(double v) {
-	pan->set_view_height(v);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-}
-
-int
-GipfelWidget::comp_params() {
-	int ret;
-
-	fl_cursor(FL_CURSOR_WAIT);
-	ret = pan->comp_params(known_hills);
-	set_labels(pan->get_visible_mountains());
-	redraw();
-	fl_cursor(FL_CURSOR_DEFAULT);
-	if (params_changed_cb)
-		params_changed_cb();
-
-	return ret;
-}
-
-int
-GipfelWidget::get_rel_track_width(Hill *m) {
-	double dist = pan->get_real_distance(m);
-
-	return (int) rint(std::max((pan->get_scale()*track_width)/(dist*10.0), 1.0));
-}
-
-void
-GipfelWidget::set_track_width(double w) {
-	track_width = w;
-	redraw();
-}
-
-int
-GipfelWidget::handle(int event) {
-	Hill *m;
-
-	switch(event) {
-		case FL_PUSH:    
-			mouse_x = Fl::event_x()-x();
-			mouse_y = Fl::event_y()-y();
-			if (Fl::event_button() == FL_LEFT_MOUSE) {
-				m = find_mountain(known_hills, mouse_x, mouse_y);
-				if (m)
-					cur_mountain = m;
-			} else if (Fl::event_button() == FL_MIDDLE_MOUSE) {
-				toggle_known_mountain(mouse_x, mouse_y);
-				if (focused_mountain) {
-					focused_mountain = NULL;
-					redraw();
-				}
-			} else if (Fl::event_button() == FL_RIGHT_MOUSE) {
-				focused_mountain = NULL;
-
-				Fl_Menu_Button rclick_menu(Fl::event_x_root(),
-					Fl::event_y_root(), 80, 1);
-				Hill *m = find_mountain(pan->get_visible_mountains(),
-					mouse_x, mouse_y);
-				char buf[1024];
-
-				rclick_menu.add("Find Peak", 0, find_peak_cb, this);
-				if (m) {
-					if (m->flags & Hill::HIDDEN)
-						snprintf(buf, sizeof(buf), "Unhide %s", m->name);
-					else
-						snprintf(buf, sizeof(buf), "Hide %s", m->name);
-
-					rclick_menu.add(buf, 0, toggle_hidden_cb, this);
-				}
-
-				rclick_menu.popup();
-			}
-
-			Fl::focus(this);
-			return 1;
-		case FL_DRAG:
-			set_mountain(Fl::event_x()-x(), Fl::event_y()-y());
-			return 1;
-		case FL_RELEASE:
-			cur_mountain = NULL;
-			if (known_hills->get_num() > 0)
-				comp_params();
-			return 1;
-		case FL_ENTER:
-			return 1;
-		case FL_LEAVE:
-			return 1;
-		case FL_MOVE:
-			m = find_mountain(pan->get_visible_mountains(), Fl::event_x()-x(), Fl::event_y()-y());
-			if (m != focused_mountain && (!m || !known_hills->contains(m))) {
-				if (m)
-					snprintf(focused_mountain_label,
-						sizeof(focused_mountain_label) - 1,
-						"%s (%dm), distance %.2fkm",
-						m->name, (int) m->height, pan->get_real_distance(m) / 1000.0);
-
-				focused_mountain = m;
-				redraw();
-			}
-			return 1;
-		case FL_FOCUS:
-			return 1;
-		case FL_UNFOCUS:
-			return 0;
-	}
-	return 0;
-}
-
-int
-GipfelWidget::export_hills(const char *file, FILE *fp) {
-	Hills export_hills, *mnts;
-
-	if (!have_gipfel_info) {
-		fprintf(stderr, "No gipfel info available for %s.\n", img_file);
-		return 0;
-	}
-
-	if (file) {
-		if (export_hills.load(file) != 0)
-			return 1;
-
-		for (int i = 0; i < export_hills.get_num(); i++)
-			export_hills.get(i)->flags |= Hill::EXPORT;
-
-		pan->add_hills(&export_hills);  
-	}
-
-	fprintf(fp, "#\n# name\theight\tx\ty\tdistance\tflags\n#\n");
-
-	mnts = pan->get_visible_mountains();
-	for (int i = 0; i < mnts->get_num(); i++) {
-		Hill *m = mnts->get(i);
-		int _x = (int) rint(m->x) + w() / 2;
-		int _y = (int) rint(m->y) + h() / 2;
-
-		if (m->flags & Hill::DUPLIC || m->flags & Hill::HIDDEN ||
-			(file && !(m->flags & Hill::EXPORT))) {
-			continue;
-		}
-
-		if (_x < 0 || _x > w() || _y < 0 || _y > h())
-			continue;
-
-		fprintf(fp, "%s\t%d\t%d\t%d\t%d\n",
-			m->name, (int) rint(m->height), _x, _y,
-			(int) rint(pan->get_real_distance(m)));
-	}
-
-	pan->remove_hills(Hill::EXPORT);
-	
-	return 0;
-}
-
-int
-GipfelWidget::get_pixel(ScanImage::mode_t m,
-	double a_alph, double a_nick, int *r, int *g, int *b) {
-	double px, py;
-	int ret;
-
-	if (img == NULL)
-		return 1;
-
-	if (pan->get_coordinates(a_alph, a_nick, &px, &py) != 0)
-		return 1;
-
-	ret = ScanImage::get_pixel(img, m, px + ((double) img->w()) / 2.0,
-		py + ((double) img->h()) / 2.0, r, g, b);
-
-	return ret;
-}
-
-int
-GipfelWidget::get_distortion_profile_name(char *buf, int buflen) {
-	int n;
-	
-	if (md && md->manufacturer() && md->model()) {
-		n = snprintf(buf, buflen, "%s_%s_%.2f_mm",
-			md->manufacturer(), md->model(), md->focal_length());
-
-		return n > buflen;
-	} else {
-		return 1;
-	}
-}
-
-static Fl_Preferences dist_prefs(Fl_Preferences::USER,
-	"Johannes.HofmannATgmx.de", "gipfel/DistortionProfiles");
-
-int
-GipfelWidget::load_distortion_params(const char *prof_name) {
-	int ret = 0;
-
-	Fl_Preferences prof(dist_prefs, prof_name);
-	ret += prof.get("k0", pan->parms.k0, pan->parms.k0);
-	ret += prof.get("k1", pan->parms.k1, pan->parms.k1);
-	ret += prof.get("x0", pan->parms.x0, pan->parms.x0);
-
-	return !ret;
-}
-
-int
-GipfelWidget::save_distortion_params(const char *prof_name, int force) {
-	Fl_Preferences prof(dist_prefs, prof_name);
-
-	if (!force && prof.entryExists("k0"))
-		return 1;
-
-	prof.set("k0", pan->parms.k0);
-	prof.set("k1", pan->parms.k1);
-	prof.set("x0", pan->parms.x0);
-
-	return 0;
-}
diff --git a/src/Hill.H b/src/Hill.H
deleted file mode 100644
index c55db15..0000000
--- a/src/Hill.H
+++ /dev/null
@@ -1,69 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef HILL_H
-#define HILL_H
-
-class Hill;
-
-class Hill {
-	public:
-		typedef enum {
-			DUPLIC      = 0x01,
-			TRACK_POINT = 0x02,
-			VISIBLE     = 0x04,
-			HIDDEN      = 0x08,
-			EXPORT      = 0x10,
-		} flags_t;
-
-		double phi, lam;
-		double height;
-		double alph;
-		double a_nick;
-		double dist;
-		double x, y;
-		int label_x, label_y;
-		char *name;
-		int flags;
-
-		Hill(const char *n, double p, double l, double h);
-		Hill(const Hill& h);
-		Hill(double x_tmp, double y_tmp);
-		~Hill();  
-};
-
-class Hills {
-	private:
-		int num, cap;
-		Hill **m;
-
-	public:
-		typedef enum {
-			SORT_ALPHA,
-			SORT_PHI,
-			SORT_NAME,
-			SORT_LABEL_Y,
-			SORT_X
-		} SortType;
-	
-		Hills();
-		Hills(const Hills *h);
-		~Hills();
-
-		int load(const char *file);
-		void mark_duplicates(double dist);
-		void add(Hill *m);
-		void remove(const Hill *m);
-		void add(Hills *h);
-		void sort(SortType t);
-		void clear();
-		void clobber();
-		int contains(const Hill *m) const;
-		inline int get_num() const { return num; };
-		Hill *get(int n) const;
-};
-
-#endif
diff --git a/src/Hill.cxx b/src/Hill.cxx
deleted file mode 100644
index 2aad3f3..0000000
--- a/src/Hill.cxx
+++ /dev/null
@@ -1,341 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <math.h>
-extern "C" {
-#include "strsep.h"
-}
-#include "Hill.H"
-
-static double pi_d, deg2rad;
-
-Hill::Hill(const char *n, double p, double l, double h) {
-	name = strdup(n);
-	phi = p;
-	lam = l;
-	height = h;
-	alph = 0.0;
-	x = 0;
-	y = 0;
-	flags = 0;
-}
-
-Hill::Hill(const Hill& h) {
-	name = strdup(h.name);
-	phi = h.phi;
-	lam = h.lam;
-	height = h.height;
-	alph = h.alph;
-	dist = h.dist;
-	x = h.x;
-	y = h.y;
-	label_x = h.label_x;
-	label_y = h.label_y;
-	flags = h.flags;
-}
-
-Hill::Hill(double x_tmp, double y_tmp) {
-	name = NULL;
-	phi = 0.0;
-	lam = 0.0;
-	height = 0.0;
-	alph = 0.0;
-	x = x_tmp;
-	y = y_tmp;
-}
-
-Hill::~Hill() {
-	if (name)
-		free(name);
-}
-
-Hills::Hills() {
-	num = 0;
-	cap = 100;
-	m = (Hill **) malloc(cap * sizeof(Hill *));
-
-	pi_d = asin(1.0) * 2.0;
-	deg2rad = pi_d / 180.0;
-}
-
-Hills::Hills(const Hills *h) {
-	num = h->num;
-	cap = h->cap;
-	m = (Hill **) malloc(cap * sizeof(Hill *));
-	memcpy(m, h->m, cap * sizeof(Hill *));
-
-	pi_d = asin(1.0) * 2.0;
-	deg2rad = pi_d / 180.0;
-}
-
-int
-Hills::load(const char *file) {
-	FILE *fp;
-	char buf[4000];
-	char *vals[10];
-	char **ap, *bp;
-	double phi, lam, height;
-	Hill *m;
-	int n;
-
-	fp = fopen(file, "r");
-	if (!fp) {
-		perror("fopen");
-		return 1;
-	}
-
-	while (fgets(buf, sizeof(buf), fp)) {
-		bp = buf;
-		memset(vals, 0, sizeof(vals));
-		n = 0;
-		for (ap = vals; (*ap = strsep(&bp, ",")) != NULL;) {
-			n++;
-			if (++ap >= &vals[10])
-				break;
-		}
-
-		// standard format including name and description
-		if (n == 6 && vals[1] && vals [3] && vals[4] && vals[5]) {
-			phi = atof(vals[3]) * deg2rad;
-			lam = atof(vals[4]) * deg2rad;
-			height = atof(vals[5]);
-
-			m = new Hill(vals[1], phi, lam, height);
-
-			add(m);
-			// track point format
-		} else if (n == 3 && vals[0] && vals[1] && vals[2]) {
-			phi = atof(vals[0]) * deg2rad;
-			lam = atof(vals[1]) * deg2rad;
-			height = atof(vals[2]);
-
-			m = new Hill("", phi, lam, height);
-
-			add(m);
-		}
-	}
-
-	fclose(fp);
-
-	return 0;
-}
-
-void Hills::mark_duplicates(double dist) {
-	Hill *m, *n;
-	int i, j;
-
-	sort(SORT_PHI);
-
-	for(i = 0; i < get_num(); i++) {
-		m = get(i);
-
-		if (m) {
-			if (m->flags & Hill::TRACK_POINT)
-				continue;
-
-			j = i + 1;
-			n = get(j);
-			while (n && fabs(n->phi - m->phi) <= dist) {
-				if (! (n->flags & Hill::DUPLIC)) {
-					if (fabs(n->lam - m->lam) <= dist && 
-						fabs(n->height - m->height) <= 50.0 ) {
-						n->flags |= Hill::DUPLIC;
-					}
-				}
-				j = j + 1;
-				n = get(j);
-			}
-		}
-	}
-}
-
-Hills::~Hills() {
-	if (m)
-		free(m);
-}
-
-void
-Hills::add(Hill *m1) {
-	if (num >= cap) {
-		cap = cap ? cap * 2 : 100;
-		m = (Hill **) realloc(m, cap * sizeof(Hill *));
-	}
-
-	m[num++] = m1;
-}
-
-void
-Hills::add(Hills *h) {
-	for (int i=0; i<h->get_num(); i++)
-		add(h->get(i));
-}
-
-static int
-comp_mountains_alpha(const void *n1, const void *n2) {
-	Hill *m1 = *(Hill **)n1;
-	Hill *m2 = *(Hill **)n2;
-
-	if (m1 && m2) {
-		if (m1->alph < m2->alph)
-			return 1;
-		else if (m1->alph > m2->alph)
-			return -1;
-		else
-			return 0;
-	} else {
-		return 0;
-	}  
-}
-
-static int
-comp_mountains_phi(const void *n1, const void *n2) {
-	Hill *m1 = *(Hill **)n1;
-	Hill *m2 = *(Hill **)n2;
-
-	if (m1 && m2) {
-		if (m1->phi < m2->phi)
-			return 1;
-		else if (m1->phi > m2->phi)
-			return -1;
-		else
-			return 0;
-	} else {
-		return 0;
-	}  
-}
-
-static int
-comp_mountains_name(const void *n1, const void *n2) {
-	Hill *m1 = *(Hill **)n1;
-	Hill *m2 = *(Hill **)n2;
-	int r;
-
-	if (m1 && m2) {
-		r = strcasecmp(m1->name, m2->name);
-		if (r == 0)
-			return (int) (m1->height - m2->height);
-		else
-			return r;
-	} else {
-		return 0;
-	}
-}
-
-static int
-comp_mountains_label_y(const void *n1, const void *n2) {
-	Hill *m1 = *(Hill **)n1;
-	Hill *m2 = *(Hill **)n2;
-
-	if (m1 && m2) {
-		if ((m2->y + m2->label_y) > (m1->y + m1->label_y))
-			return 1;
-		else if ((m2->y + m2->label_y) < (m1->y + m1->label_y))
-			return -1;
-		else
-			return 0;
-	} else {
-		return 0;
-	}
-}
-
-static int
-comp_mountains_x(const void *n1, const void *n2) {
-    Hill *m1 = *(Hill **)n1;
-    Hill *m2 = *(Hill **)n2;
-
-    if (m1 && m2) {
-		if (m2->x < m1->x)
-			return 1;
-		else if (m2->x > m1->x)
-			return -1;
-		else
-			return 0;
-    } else {
-        return 0;
-    }
-}
-
-void
-Hills::sort(SortType t) {
-	int (*cmp)(const void *, const void *);
-	
-	if (!m || num < 2)
-		return;
-
-	switch (t) {
-		case SORT_ALPHA:
-			cmp = comp_mountains_alpha;
-			break;
-		case SORT_PHI:
-			cmp = comp_mountains_phi;
-			break;
-		case SORT_NAME:
-			cmp = comp_mountains_name;
-			break;
-		case SORT_LABEL_Y:
-			cmp = comp_mountains_label_y;
-			break;
-		case SORT_X:
-			cmp = comp_mountains_x;
-			break;
-		default:
-			fprintf(stderr, "ERROR: Unknown sort type %d\n", t);
-			return;
-	}
-
-	qsort(m, num, sizeof(Hill *), cmp);
-}
-
-void
-Hills::clear() {
-	if (m) {
-		free(m);
-		m = NULL;
-	}
-	cap = 0;
-	num = 0;
-}
-
-int
-Hills::contains(const Hill *m) const {
-	for  (int i = 0; i < get_num(); i++)
-		if (get(i) == m)
-			return 1;
-
-	return 0;
-}
-
-void
-Hills::remove(const Hill *h) {
-	for (int i = 0; i < get_num(); i++) {
-		if (get(i) == h) {
-			memmove(&m[i], &m[i+1], (get_num() - i - 1) * sizeof(Hill*));
-			num--;
-		}
-	}
-}
-
-void
-Hills::clobber() {
-	int i;
-
-	for (i = 0; i < get_num(); i++)
-		if (get(i))
-			delete(get(i));
-
-	clear();
-}
-
-Hill *
-Hills::get(int n) const {
-	if (n < 0 || n >= num)
-		return NULL;
-	else
-		return m[n];
-}
diff --git a/src/ImageMetaData.H b/src/ImageMetaData.H
deleted file mode 100644
index 109652d..0000000
--- a/src/ImageMetaData.H
+++ /dev/null
@@ -1,65 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef IMAGE_META_DATA_H
-#define IMAGE_META_DATA_H
-
-class ImageMetaData {
-	private:
-		char *_manufacturer;
-		char *_model;
-		double _longitude;
-		double _latitude;
-		double _height;
-		double _direction;
-		double _nick;
-		double _tilt;
-		double _k0;
-		double _k1;
-		double _x0;
-		double _focal_length;
-		double _focal_length_35mm;
-		double _scale;
-		int _projection_type;
-		int _have_gipfel_info;
-
-		int load_image_jpgcom(char *name);
-		int save_image_jpgcom(char *in_img, char *out_img);
-		int load_image_exif(char *name);
-		void clear();
-
-	public:
-		ImageMetaData();
-		~ImageMetaData();
-
-		int load_image(char *name);
-		int save_image(char *in_img, char *out_img);
-
-		const char *manufacturer() {return _manufacturer;};
-		const char *model() {return _model;};
- 		double longitude() {return _longitude;};
-		double latitude() {return _latitude;};
-		double height() {return _height;};
-		double direction() {return _direction;};
-		double nick() {return _nick;};
-		double tilt() {return _tilt;};
-		double focal_length() {return _focal_length;};
-		double focal_length_35mm() {return _focal_length_35mm;};
-		int projection_type() {return _projection_type;};
-		void distortion_params(double *_k0, double *_k1, double *_x0);
-
-		void longitude(double v) {_longitude = v;};
-		void latitude(double v) {_latitude = v;};
-		void height(double v) {_height = v;};
-		void direction(double v) {_direction = v;};
-		void nick(double v) {_nick = v;};
-		void tilt(double v) {_tilt = v;};
-		void focal_length_35mm(double v) {_focal_length_35mm = v;};
-		void projection_type(int v) {_projection_type = v;};
-		void distortion_params(double k0, double k1, double x0);
-};
-
-#endif
diff --git a/src/ImageMetaData.cxx b/src/ImageMetaData.cxx
deleted file mode 100644
index fa334aa..0000000
--- a/src/ImageMetaData.cxx
+++ /dev/null
@@ -1,322 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <errno.h>
-#include <math.h>
-#include <string.h>
-#include <fcntl.h>
-#include <libgen.h>
-#include <assert.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include <exiv2/exiv2.hpp>
-
-#include "../config.h"
-#include "ImageMetaData.H"
-
-#if !defined(O_BINARY)
-#define O_BINARY 0
-#endif
-
-ImageMetaData::ImageMetaData() {
-	_manufacturer = NULL;
-    _model = NULL;
-	clear();
-}
-
-ImageMetaData::~ImageMetaData() {
-	if (_manufacturer)
-		free(_manufacturer);
-	if (_model)
-		free(_model);
-}
-
-void
-ImageMetaData::clear() {
-	if (_manufacturer)
-		free(_manufacturer);
-	_manufacturer = NULL;
-	if (_model)
-		free(_model);
-    _model = NULL;
-	_longitude = NAN;
-	_latitude = NAN;
-	_height = NAN;
-	_direction = NAN;
-	_nick = NAN;
-	_tilt = NAN;
-	_k0 = NAN;
-	_k1 = NAN;
-	_x0 = NAN;
-	_focal_length = NAN;
-	_focal_length_35mm = NAN;
-	_scale = NAN;
-	_projection_type = 0;
-}
-
-int
-ImageMetaData::load_image(char *name) {
-	clear();
-	load_image_jpgcom(name);
-	load_image_exif(name); // fill missing values from exif data
-	return 0;
-}
-
-int
-ImageMetaData::save_image(char *in_img, char *out_img) {
-	return save_image_jpgcom(in_img, out_img);
-}
-
-static void
-exifSetValue(double *destVal, Exiv2::ExifData *exifData, const char *name) {
-	Exiv2::ExifKey key(name);
-	Exiv2::ExifData::iterator pos = exifData->findKey(key);
-	pos = exifData->findKey(key);
-	if (pos != exifData->end() && pos->toFloat() >= 0)
-		*destVal = pos->toFloat();
-}
-
-static void
-exifSetCoordinate(double *destVal, Exiv2::ExifData *exifData, const char *name) {
-	Exiv2::ExifKey key(name);
-	Exiv2::ExifData::iterator pos = exifData->findKey(key);
-
-	if (pos != exifData->end()) {
-		if (pos->toFloat() >= 0)
-			*destVal = pos->toFloat();
-		if (pos->toFloat(1) >= 0)
-			*destVal += pos->toFloat(1) / 60;
-		if (pos->toFloat(2) >= 0)
-			*destVal += pos->toFloat(2) / 3600;
-	}
-}
-
-int
-ImageMetaData::load_image_exif(char *name) {
-#if EXIV2_TEST_VERSION(0,28,0)
-       Exiv2::Image::UniquePtr image;
-#else
-       Exiv2::Image::AutoPtr image;
-#endif
-
-	try {
-		image = Exiv2::ImageFactory::open(name);
-		image->readMetadata();
-	} catch (const Exiv2::Error &error) {
-		fprintf(stderr, "Error reading metadata\n");
-		return 1;
-	}
-
-    Exiv2::ExifData &exifData = image->exifData();
-    if (exifData.empty()) {
-		fprintf(stderr, "%s: No Exif data found in the file", name);
-		return 1;
-	}
-
-    Exiv2::ExifData::iterator pos = exifData.end();
-
-    if (!_manufacturer ) {
-		Exiv2::ExifKey key("Exif.Image.Make"); // tag auch wirklich vorhanden?
-		pos = exifData.findKey(key);
-		if (pos != exifData.end() && pos->size())
-			_manufacturer = strdup(pos->toString().c_str());
-	}
-
-    if (!_model) {
-		Exiv2::ExifKey key("Exif.Image.Model");
-		pos = exifData.findKey(key);
-		if (pos != exifData.end() && pos->size() )
-			_model = strdup(pos->toString().c_str());
-	}
-
-    if (std::isnan(_focal_length))
-		exifSetValue(&_focal_length, &exifData, "Exif.Photo.FocalLength");
-
-    if (std::isnan(_focal_length_35mm))
-		exifSetValue(&_focal_length_35mm, &exifData, "Exif.Photo.FocalLengthIn35mmFilm");
-
-    if (std::isnan(_longitude))
-		exifSetCoordinate(&_longitude, &exifData, "Exif.GPSInfo.GPSLongitude");
-
-    if (std::isnan(_latitude))
-		exifSetCoordinate(&_latitude, &exifData, "Exif.GPSInfo.GPSLatitude");
-
-    if (std::isnan(_height))
-		exifSetValue(&_height, &exifData, "Exif.GPSInfo.GPSAltitude");
-
-    return 0;
-}
-
-
-#define GIPFEL_FORMAT "gipfel: longitude " FMT_DOUBLE ", latitude " FMT_DOUBLE ", height " FMT_DOUBLE ", direction " FMT_DOUBLE ", nick " FMT_DOUBLE ", tilt " FMT_DOUBLE ", focal_length_35mm " FMT_DOUBLE ", projection type %d, k0 " FMT_DOUBLE ", k1 " FMT_DOUBLE ", x0 " FMT_DOUBLE ""
-
-#define FMT_DOUBLE "%lf"
-static const char *gipfel_format_scan = GIPFEL_FORMAT;
-
-#undef FMT_DOUBLE
-#define FMT_DOUBLE "%f"
-static const char *gipfel_format_prnt = GIPFEL_FORMAT;
-
-#undef FMT_DOUBLE
-#undef GIPFEL_FORMAT
-
-int
-ImageMetaData::load_image_jpgcom(char *name) {
-    double lo, la, he, dir, ni, ti, fr, k0, k1, x0 = 0.0;
-    int pt = 0;
-    int n, ret = 1;
-#if EXIV2_TEST_VERSION(0,28,0)
-    Exiv2::Image::UniquePtr image;
-#else
-    Exiv2::Image::AutoPtr image;
-#endif
-
-    try {
-        image = Exiv2::ImageFactory::open(name);
-        image->readMetadata();
-    } catch (const Exiv2::Error &error) {
-        fprintf(stderr, "Error reading metadata\n");
-        return 1;
-    }
-
-    const char *com = image->comment().c_str();
-
-    if ((n = sscanf(com, gipfel_format_scan,
-            &lo, &la, &he, &dir, &ni, &ti, &fr, &pt, &k0, &k1, &x0)) >= 8) {
-        _longitude = lo;
-        _latitude  = la;
-        _height    = he;
-        _direction = dir;
-        _nick      = ni;
-        _tilt      = ti;
-        _focal_length_35mm = fr;
-        _projection_type = pt;
-
-        if (n >= 10) {
-            _k0 = k0;
-            _k1 = k1;
-            _x0 = x0;
-		}
-
-		ret = 0;
-	}
-
-    return ret;
-}
-
-int
-ImageMetaData::save_image_jpgcom(char *in_img, char *out_img) {
-    char buf[1024], *tmpname;
-    int n, in_fd, tmp_fd, err = 0;
-
-    char* dirbuf = strdup(out_img);
-#if HAVE_MKSTEMP
-	char tmpbuf[MAXPATHLEN];
-	snprintf(tmpbuf, sizeof(tmpbuf), "%s/.gipfelXXXXXX", dirname(dirbuf));
-	tmp_fd = mkstemp(tmpbuf);
-	tmpname = tmpbuf;
-#else
-	tmpname = tempnam(dirname(dirbuf), ".gipfel");
-	tmp_fd = open(tmpname, O_WRONLY|O_TRUNC|O_CREAT|O_BINARY, S_IRUSR|S_IWUSR);
-#endif
-	free(dirbuf);
-
-	if (tmp_fd == -1) {
-		perror("mkstemp");
-		return 1;
-	}
-
-	in_fd = open(in_img, O_RDONLY|O_BINARY);
-	if (in_fd == -1) {
-		perror("open");
-		unlink(tmpname);
-		close(tmp_fd);
-		return 1;
-	}
-
-	while ((n = read(in_fd, buf, sizeof(buf))) > 0) {
-		if (n < 0 || write(tmp_fd, buf, n) != n) {
-			perror("write");
-			err++;
-			break;
-		}
-	}
-
-	close(in_fd);
-
-#if EXIV2_TEST_VERSION(0,28,0)
-    Exiv2::Image::UniquePtr image = Exiv2::ImageFactory::open(tmpname);
-#else
-    Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(tmpname);
-#endif
-    if (!image.get())
-		err++;
-
-    image->readMetadata();
-    image->clearComment();
-
-    snprintf(buf, sizeof(buf), gipfel_format_prnt,
-        _longitude,
-        _latitude,
-        _height,
-        _direction,
-        _nick,
-        _tilt,
-        _focal_length_35mm,
-        _projection_type,
-        _k0, _k1, _x0);
-
-    image->setComment(buf);
-
-	try {
-		image->writeMetadata();
-	} catch (const Exiv2::Error &error) {
-		fprintf(stderr, "Error writing metadata\n");
-		err++;
-	}
-
-#ifdef HAVE_FSYNC
-	fsync(tmp_fd); // make sure data is on disk before replacing orig file
-#endif
-
-	close(tmp_fd);
-
-	if (err == 0) { // only overwrite existing image if everything was ok
-#ifdef WIN32
-		// Workaround as Windows does not seem to replace files on rename()
-		struct stat stFileInfo;
-		if (stat(out_img, &stFileInfo) == 0)
-			unlink(out_img);
-#endif
-
-		if (rename(tmpname, out_img) != 0) {
-			perror("rename");
-			err++;
-			unlink(tmpname);
-		}
-	}
-
-    return (err != 0);
-}
-
-void
-ImageMetaData::distortion_params(double *k0, double *k1, double *x0) {
-	*k0 = _k0;	
-	*k1 = _k1;	
-	*x0 = _x0;	
-}
-
-void
-ImageMetaData::distortion_params(double k0, double k1, double x0) {
-	_k0 = k0;	
-	_k1 = k1;	
-	_x0 = x0;	
-}
diff --git a/src/JPEGOutputImage.H b/src/JPEGOutputImage.H
deleted file mode 100644
index 5ce9069..0000000
--- a/src/JPEGOutputImage.H
+++ /dev/null
@@ -1,38 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef JPEGOUTPUTIMAGE_H
-#define JPEGOUTPUTIMAGE_H
-
-#include <stdio.h>
-extern "C" {
-#include <jpeglib.h>
-#undef HAVE_STDLIB_H
-}
-
-#include "OutputImage.H"
-
-class JPEGOutputImage : public OutputImage {
-	private:
-		unsigned char *row;
-		char *file;
-		struct jpeg_compress_struct cinfo;
-		struct jpeg_error_mgr jerr;
-		FILE *fp;
-		int quality;
-
-	protected:
-		int init_internal();
-		int set_pixel_internal(int x, int r, int g, int b);	
-		int next_line_internal();
-		int done_internal();
-
-	public:
-		JPEGOutputImage(const char *file, int quality = 90);
-		~JPEGOutputImage();
-};
-
-#endif
diff --git a/src/JPEGOutputImage.cxx b/src/JPEGOutputImage.cxx
deleted file mode 100644
index 8bbd40b..0000000
--- a/src/JPEGOutputImage.cxx
+++ /dev/null
@@ -1,104 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-extern "C" {
-#include <jpeglib.h>
-}
-
-#include "JPEGOutputImage.H"
-
-JPEGOutputImage::JPEGOutputImage(const char *f, int q) : OutputImage() {
-	file = strdup(f);
-	fp = NULL;
-	row = NULL;
-	quality = q;
-}
-
-JPEGOutputImage::~JPEGOutputImage() {
-	if (row)
-		free(row);
-	if (file)
-		free(file);
-}
-
-int
-JPEGOutputImage::init_internal() {
-	if (row)
-		free(row);
-	row = NULL;
-
-	row = (unsigned char*) calloc(3 * W, sizeof(char));
-	if (!row) {
-		perror("calloc");
-		return 1;
-	}
-
-	if (fp)
-		fclose(fp);
-
-	if ((fp = fopen(file, "wb")) == NULL) {
-		fprintf(stderr, "can't open %s\n", file);
-		return 1;
-	}
-
-	cinfo.err = jpeg_std_error(&jerr);
-	jpeg_create_compress(&cinfo);
-	jpeg_stdio_dest(&cinfo, fp);
-	cinfo.image_width = W;
-	cinfo.image_height = H;
-	cinfo.input_components = 3;          /* # of color components per pixel */
-	cinfo.in_color_space = JCS_RGB;
-
-	jpeg_set_defaults(&cinfo);
-	jpeg_set_quality(&cinfo, quality, TRUE);
-
-	jpeg_start_compress(&cinfo, TRUE);
-
-	return 0;
-}
-
-int
-JPEGOutputImage::set_pixel_internal(int x, int r, int g, int b) {
-	row[x*3+0] = (unsigned char) (r / 255);
-	row[x*3+1] = (unsigned char) (g / 255);
-	row[x*3+2] = (unsigned char) (b / 255);
-
-	return 0;
-}
-
-int
-JPEGOutputImage::next_line_internal() {
-	JSAMPROW row_pointer[1];
-
-	row_pointer[0] = row;
-	jpeg_write_scanlines(&cinfo, row_pointer, 1);
-	memset(row, 0, sizeof(char) * 3 * W);
-	return 0;
-}
-
-int
-JPEGOutputImage::done_internal() {
-	jpeg_finish_compress(&cinfo);
-	jpeg_destroy_compress(&cinfo);
-
-	if (fp)
-		fclose(fp);
-	fp = NULL;
-
-	if (row)
-		free(row);
-	row = NULL;
-
-	if (fp)
-		fclose(fp);
-	fp = NULL;
-
-	return 0;
-}	
-
diff --git a/src/Makefile.am b/src/Makefile.am
deleted file mode 100644
index 3d4a174..0000000
--- a/src/Makefile.am
+++ /dev/null
@@ -1,45 +0,0 @@
-bin_PROGRAMS = gipfel
-
-gipfel_SOURCES = \
-	gipfel.cxx \
-	GipfelWidget.cxx \
-	Panorama.cxx \
-	ProjectionLSQ.cxx \
-	ProjectionRectilinear.cxx \
-	ProjectionCylindrical.cxx \
-	Hill.cxx \
-	Fl_Value_Dial.cxx \
-	Fl_Search_Chooser.cxx \
-	choose_hill.cxx \
-	Stitch.cxx \
-	OutputImage.cxx \
-	JPEGOutputImage.cxx \
-	TIFFOutputImage.cxx \
-	PreviewOutputImage.cxx \
-	ImageMetaData.cxx \
-	ScreenDump.cxx \
-	ScanImage.cxx \
-	strsep.c
-
-noinst_HEADERS = \
-	GipfelWidget.H \
-	Panorama.H \
-	ProjectionLSQ.H \
-	ProjectionRectilinear.H \
-	ProjectionRectilinear_funcs.cxx \
-	ProjectionCylindrical.H \
-	ProjectionCylindrical_funcs.cxx \
-	Hill.H \
-	ViewParams.H \
-	Fl_Value_Dial.H \
-	Fl_Search_Chooser.H \
-	choose_hill.H \
-	Stitch.H \
-	OutputImage.H \
-	JPEGOutputImage.H \
-	TIFFOutputImage.H \
-	PreviewOutputImage.H \
-	ImageMetaData.H \
-	ScreenDump.H \
-	ScanImage.H \
-	strsep.h
diff --git a/src/Makefile.lsq_funcs b/src/Makefile.lsq_funcs
deleted file mode 100644
index 46bab6e..0000000
--- a/src/Makefile.lsq_funcs
+++ /dev/null
@@ -1,7 +0,0 @@
-all: ProjectionRectilinear_funcs.cxx ProjectionCylindrical_funcs.cxx
-
-ProjectionRectilinear_funcs.cxx: lsq_rectilinear.mac expr2c.mac
-	maxima -b lsq_rectilinear.mac | grep "^double" > ProjectionRectilinear_funcs.cxx
-
-ProjectionCylindrical_funcs.cxx: lsq_cylindrical.mac expr2c.mac
-	maxima -b lsq_cylindrical.mac | grep "^double" > ProjectionCylindrical_funcs.cxx
diff --git a/src/OutputImage.H b/src/OutputImage.H
deleted file mode 100644
index 0718074..0000000
--- a/src/OutputImage.H
+++ /dev/null
@@ -1,32 +0,0 @@
-//
-// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef OUTPUTIMAGE_H
-#define OUTPUTIMAGE_H
-
-class OutputImage {
-	private:
-		int initialized;
-
-	protected:
-		int W, H, line;
-
-		virtual int init_internal() {return 0;};
-		virtual int set_pixel_internal(int x, int r, int g, int b) {return 0;};	
-		virtual int next_line_internal() {return 0;};
-		virtual int done_internal() {return 0;};
-
-	public:
-		OutputImage();
-		virtual ~OutputImage() {};
-		
-		virtual int init(int w1, int h1);
-		int set_pixel(int x, int r, int g, int b);
-		int next_line();
-		int done();
-};
-
-#endif
diff --git a/src/OutputImage.cxx b/src/OutputImage.cxx
deleted file mode 100644
index b4c4739..0000000
--- a/src/OutputImage.cxx
+++ /dev/null
@@ -1,58 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-
-#include "OutputImage.H"
-
-OutputImage::OutputImage() {
-	W = 0;
-	H = 0;
-	initialized = 0;
-}
-
-int
-OutputImage::init(int w1, int h1) {
-	int ret;
-
-	W = w1;
-	H = h1;
-	line = 0;
-
-	ret = init_internal();
-
-	if (ret == 0)
-		initialized = 1;
-		
-	return ret;
-}
-
-int
-OutputImage::set_pixel(int x, int r, int g, int b) {
-	if (!initialized || x < 0 || x >= W)
-		return 1;
-	else
-		return set_pixel_internal(x, r, g, b);
-}
-
-int
-OutputImage::next_line() {
-	if (!initialized || line++ >= H)
-		return 1;
-	else
-		return next_line_internal();
-}
-
-int
-OutputImage::done() {
-	if (!initialized) {
-		return 1;
-	} else {
-		next_line();
-		return done_internal();
-	}
-}
diff --git a/src/Panorama.H b/src/Panorama.H
deleted file mode 100644
index 1f4fdeb..0000000
--- a/src/Panorama.H
+++ /dev/null
@@ -1,83 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef PANORAMA_H
-#define PANORAMA_H
-
-#include "Hill.H"
-#include "ProjectionLSQ.H"
-#include "ViewParams.H"
-
-class Panorama {
-	private:
-		double view_phi, view_lam, view_height;
-		char *view_name;
-		double height_dist_ratio;
-		double hide_value;
-		Hills *mountains;
-		Hills *close_mountains;
-		Hills *visible_mountains;
-		ProjectionLSQ *proj;
-		ProjectionLSQ::Projection_t projection_type;
-		double pi_d, deg2rad;
-
-		Hill * get_pos(const char *name);
-		void update_angles();
-		void update_coordinates(Hills *excluded_hills = NULL);
-		void update_close_mountains();
-		void update_visible_mountains(Hills *excluded_hills = NULL);
-		void mark_hidden(Hills *hills);
-		double distance(double phi, double lam);
-		double alpha(const Hill *m);
-		double nick(const Hill *m);
-		double refraction(const Hill *m);
-		double comp_center_angle(double alph_a, double alph_b, double d1, double d2);
-		double comp_scale(double alph_a, double alph_b, double d1, double d2);
-		int get_matrix(double m[]);
-		int optimize(Hill *m1, Hill *m2);
-		int is_visible(double a_alph);
-
-	public:
-		ViewParams parms;
-
-		Panorama();
-		~Panorama();
-		int load_data(const char *name);
-		void add_hills(Hills *h);
-		void remove_hills(int flags);
-		int set_viewpoint(const char *pos);  
-		void set_viewpoint(const Hill *m);  
-		void set_height_dist_ratio(double r);
-		void set_hide_value(double h);
-		Hills * get_mountains();
-		Hills * get_close_mountains();
-		Hills * get_visible_mountains();
-		void set_center_angle(double a);
-		void set_nick_angle(double a);
-		void set_tilt_angle(double a);
-		void set_scale(double s);
-		void set_view_lat(double v);
-		void set_view_long(double v);
-		void set_view_height(double v);
-		const char * get_viewpoint();  
-		double get_center_angle();
-		double get_nick_angle();
-		double get_tilt_angle();
-		double get_scale();
-		double get_height_dist_ratio();
-		double get_view_lat();
-		double get_view_long();
-		double get_view_height();
-		double get_earth_radius(double latitude);
-		double get_real_distance(const Hill *m);
-		int comp_params(Hills *h);
-		ProjectionLSQ::Projection_t get_projection();
-		void set_projection(ProjectionLSQ::Projection_t p);
-		void get_distortion_params(double *k0, double *k1, double *x0);
-		void set_distortion_params(double k0, double k1, double x0);
-		int get_coordinates(double a_alph, double a_nick, double *x, double *y);
-};
-#endif
diff --git a/src/Panorama.cxx b/src/Panorama.cxx
deleted file mode 100644
index ccba04f..0000000
--- a/src/Panorama.cxx
+++ /dev/null
@@ -1,476 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-
-#include "Panorama.H"
-#include "ProjectionRectilinear.H"
-#include "ProjectionCylindrical.H"
-
-#define EARTH_RADIUS 6371000.785
-
-Panorama::Panorama() {
-	mountains = new Hills();
-	close_mountains = new Hills();
-	visible_mountains = new Hills();
-	height_dist_ratio = 0.07;
-	hide_value = 1.2;
-	pi_d = asin(1.0) * 2.0;
-	deg2rad = pi_d / 180.0;
-	parms.a_center = 0.0;
-	parms.a_nick = 0.0;
-	parms.a_tilt = 0.0;
-	parms.scale = 3500.0;
-	parms.k0 = 0.0;
-	parms.k1 = 0.0;
-	parms.x0 = 0.0;
-	view_name = NULL;
-	view_phi = 0.0;
-	view_lam = 0.0;
-	view_height = 0.0;
-	proj = NULL;
-	set_projection(ProjectionLSQ::RECTILINEAR);
-}
-
-Panorama::~Panorama() {
-	visible_mountains->clear();
-	mountains->clobber();
-	delete visible_mountains;
-	delete mountains;
-}
-
-int
-Panorama::load_data(const char *name) {
-	if (mountains->load(name) != 0) {
-		fprintf(stderr, "Could not load datafile %s\n", name);
-		return 1;
-	}
-
-	mountains->mark_duplicates(0.00001);
-	update_angles();
-
-	return 0;
-}
-
-void
-Panorama::add_hills(Hills *h) {
-	mountains->add(h);
-
-	mountains->mark_duplicates(0.00001);
-	update_angles();
-}
-
-void
-Panorama::remove_hills(int flags) {
-	Hills *h_new = new Hills();
-	Hill *m;
-
-	for (int i = 0; i < mountains->get_num(); i++) {
-		m = mountains->get(i);
-		if (! (m->flags & flags))
-			h_new->add(m);
-	}
-
-	delete mountains;
-	mountains = h_new;
-}
-
-int
-Panorama::set_viewpoint(const char *name) {
-	Hill *m = get_pos(name);
-	if (m == NULL) {
-		fprintf(stderr, "Could not find exactly one entry for %s.\n", name);
-		return 1;
-	}
-
-	set_viewpoint(m);
-	return 0;
-}
-
-void
-Panorama::set_viewpoint(const Hill *m) {
-	if (m == NULL)
-		return;
-
-	view_phi = m->phi;
-	view_lam = m->lam;
-	view_height = m->height;
-
-	if (view_name)
-		free(view_name);
-
-	view_name = strdup(m->name);
-
-	update_angles();
-}
-
-Hills * 
-Panorama::get_mountains() {
-	return mountains;
-}
-
-Hills * 
-Panorama::get_close_mountains() {
-	return close_mountains;
-}
-
-Hills * 
-Panorama::get_visible_mountains() {
-	return visible_mountains;
-}
-
-int
-Panorama::comp_params(Hills *h) {
-	int ret;
-
-	ret = proj->comp_params(h, &parms);
-	if (ret == 0)
-		update_visible_mountains(h);
-
-	return ret;
-}
-
-void
-Panorama::set_center_angle(double a) {
-	parms.a_center = a * deg2rad;
-	update_visible_mountains();
-}
-
-void
-Panorama::set_nick_angle(double a) {
-	parms.a_nick = a * deg2rad;
-	update_coordinates();
-}
-
-void
-Panorama::set_tilt_angle(double a) {
-	parms.a_tilt = a * deg2rad;
-	update_coordinates();
-}
-
-void
-Panorama::set_scale(double s) {
-	parms.scale = s;
-	update_coordinates();
-}
-
-void
-Panorama::get_distortion_params(double *k0, double *k1, double *x0) {
-	*k0 = parms.k0;
-	*k1 = parms.k1;
-	*x0 = parms.x0;
-}
-
-void
-Panorama::set_distortion_params(double k0, double k1, double x0) {
-	parms.k0 = k0;
-	parms.k1 = k1;
-	parms.x0 = x0;
-	update_coordinates();
-}
-
-void
-Panorama::set_height_dist_ratio(double r) {
-	height_dist_ratio = r;
-	update_close_mountains();
-}
-
-void
-Panorama::set_view_long(double v) {
-	view_lam = v * deg2rad;
-	update_angles();
-}
-
-void
-Panorama::set_view_lat(double v) {
-	view_phi = v * deg2rad;
-	update_angles();
-}
-
-void
-Panorama::set_view_height(double v) {
-	view_height = v;
-	update_angles();
-}
-
-void
-Panorama::set_projection(ProjectionLSQ::Projection_t p) {
-	projection_type = p;
-
-	if (proj) {
-		delete proj;
-		proj = NULL;
-	}
-
-	switch(projection_type) {
-		case ProjectionLSQ::RECTILINEAR:
-			proj = new ProjectionRectilinear();
-			break;
-		case ProjectionLSQ::CYLINDRICAL:
-			proj = new ProjectionCylindrical();
-			break;
-	}
-
-	update_angles();
-}
-
-const char *
-Panorama::get_viewpoint() {
-	return view_name;
-}
-
-double
-Panorama::get_center_angle() {
-	return parms.a_center / deg2rad;
-}
-
-double
-Panorama::get_nick_angle() {
-	return parms.a_nick / deg2rad;
-}
-
-double
-Panorama::get_tilt_angle() {
-	return parms.a_tilt / deg2rad;
-}
-
-double
-Panorama::get_scale() {
-	return parms.scale;
-}
-
-double
-Panorama::get_height_dist_ratio() {
-	return height_dist_ratio;
-}
-
-double
-Panorama::get_view_long() {
-	return view_lam / deg2rad;
-}
-
-double
-Panorama::get_view_lat() {
-	return view_phi / deg2rad;
-}
-
-double
-Panorama::get_view_height() {
-	return view_height;
-}
-
-ProjectionLSQ::Projection_t
-Panorama::get_projection() {
-	return projection_type;
-}
-
-Hill *
-Panorama::get_pos(const char *name) {
-	Hill *m, *ret = NULL;
-
-	for (int i = 0; i < mountains->get_num(); i++) {
-		m = mountains->get(i);
-
-		if (strcmp(m->name, name) == 0) {
-			ret = m;
-			fprintf(stderr, "Found matching entry: %s (%fm)\n",
-				m->name, m->height);
-		}
-	}
-
-	return ret;
-}
-
-void 
-Panorama::update_angles() {
-	for (int i = 0; i < mountains->get_num(); i++) {
-		Hill *m = mountains->get(i);
-
-		m->dist = distance(m->phi, m->lam);
-		if (m->phi != view_phi || m->lam != view_lam)
-			m->alph = alpha(m);
-	}
-
-	mountains->sort(Hills::SORT_ALPHA);
-
-	update_close_mountains();
-}
-
-void
-Panorama::set_hide_value(double h) {
-	hide_value = h;
-	update_visible_mountains();
-}
-
-void
-Panorama::mark_hidden(Hills *hills) {
-	double h;
-
-	for (int i = 0; i < hills->get_num(); i++) {
-		Hill *m = hills->get(i);
-
-		m->flags &= ~Hill::HIDDEN;
-
-		if (m->flags & Hill::DUPLIC)
-			continue;
-
-		for (int j = 0; j < hills->get_num(); j++) {
-			Hill *n = hills->get(j);
-
-			if (n->flags & Hill::DUPLIC || n->flags & Hill::TRACK_POINT)
-				continue;
-
-			if (m == n || fabs(m->alph - n->alph > pi_d / 2.0))
-				continue;
-
-			if (m->dist < n->dist || m->a_nick > n->a_nick)
-				continue;
-
-			h = (n->a_nick - m->a_nick) / fabs(m->alph - n->alph);
-			if (isinf(h) || h > hide_value)
-				m->flags |= Hill::HIDDEN;
-		}
-	}
-}
-
-void 
-Panorama::update_close_mountains() {
-	close_mountains->clear();
-
-	for (int i = 0; i < mountains->get_num(); i++) {
-		Hill *m = mountains->get(i);
-
-		if (m->flags & Hill::TRACK_POINT ||
-			((m->phi != view_phi || m->lam != view_lam) &&
-			 (m->height / (m->dist * EARTH_RADIUS) > height_dist_ratio))) {
-
-			m->a_nick = nick(m);
-			close_mountains->add(m);
-		}
-	}
-
-	mark_hidden(close_mountains);
-	update_visible_mountains();
-}
-
-void 
-Panorama::update_visible_mountains(Hills *excluded_hills) {
-	visible_mountains->clear();
-
-	for (int i = 0; i < close_mountains->get_num(); i++) {
-		Hill *m = close_mountains->get(i);
-
-		if (is_visible(m->alph)) {
-			visible_mountains->add(m);
-			m->flags |= Hill::VISIBLE;
-		} else {
-			m->flags &= ~Hill::VISIBLE;
-		}
-	}
-
-	update_coordinates(excluded_hills);
-}
-
-void
-Panorama::update_coordinates(Hills *excluded_hills) {
-	for (int i = 0; i < visible_mountains->get_num(); i++) {
-		Hill *m = visible_mountains->get(i);
-		if (!excluded_hills || !excluded_hills->contains(m))
-			proj->get_coordinates(m->alph, m->a_nick, &parms, &m->x, &m->y);
-	}
-}
-
-double 
-Panorama::distance(double phi, double lam) {
-	double d_lam = view_lam - lam;
-
-	return atan2(sqrt(pow(cos(phi) * sin(d_lam), 2.0) +
-				pow(cos(view_phi) * sin(phi) - sin(view_phi) * cos(phi) * cos(d_lam), 2.0)),
-		sin(view_phi) * sin(phi) + cos(view_phi) * cos(phi) * cos(d_lam));
-}
-
-double 
-Panorama::alpha(const Hill *m) {
-	double sin_alph, cos_alph;
-
-	sin_alph = sin(m->lam - view_lam) * cos(m->phi) / sin(m->dist);
-	cos_alph = (sin(m->phi) - sin(view_phi) * cos(m->dist)) /
-		(cos(view_phi) * sin(m->dist));
-
-	return fmod(atan2(sin_alph, cos_alph) + 2.0 * pi_d, 2.0 * pi_d);
-}
-
-// approximation of refraction effect as described by Tom Chester at
-// http://tchester.org/sgm/analysis/peaks/refraction.html
-double
-Panorama::refraction(const Hill *m) {
-	double a, b, c, alpha = 6.5, T0 = 10.0;
-
-	a = 2.9e-4 * exp (-view_height / 10000.0) / (1.0 + 2.9 * T0 / 760.0);
-	b = 2.9 * alpha / (760.0 * (1.0 + 2.9 * T0 / 760.0));
-	c = a * (b - 1.0 / 10.0);
-
-	return c * get_real_distance(m) / (2000.0 * (1.0 + a));
-}
-
-double
-Panorama::nick(const Hill *m) {
-	double b, c, theta = refraction(m);
-
-	b = m->height + get_earth_radius(m->phi);
-	c = view_height + get_earth_radius(view_phi);
-
-	return atan((cos(m->dist) * b - c) / (sin(m->dist) * b)) - theta;
-}
-
-// return local distance to center of WGS84 ellipsoid
-double
-Panorama::get_earth_radius(double phi) {
-	double a = 6378137.000;
-	double b = 6356752.315;
-	double r;
-	double ata = tan(phi);
-
-	r = a*pow(pow(ata,2)+1,1.0/2.0)*fabs(b)*pow(pow(b,2)+pow(a,2)*pow(ata,2),-1.0/2.0);
-	return r;
-}
-
-double
-Panorama::get_real_distance(const Hill *m) {
-	double a, b, c, gam;
-
-	a = view_height + get_earth_radius(view_phi);
-	b = m->height + get_earth_radius(m->phi); 
-	gam = m->dist;
-
-	c = sqrt(pow(a, 2.0) + pow(b, 2.0) - 2.0 * a * b * cos(gam));
-	return c;
-}
-
-int
-Panorama::is_visible(double a_alph) {
-	double center_dist;
-
-	center_dist = fabs(a_alph - parms.a_center);
-	if (center_dist > pi_d) {
-		center_dist = 2*pi_d - center_dist;
-	}
-
-	return center_dist < proj->get_view_angle();
-}
-
-int
-Panorama::get_coordinates(double a_alph, double a_nick, double *x, double *y) {
-	if (is_visible(a_alph)) {
-		proj->get_coordinates(a_alph, a_nick, &parms, x, y);
-		return 0;
-	} else {
-		return 1;
-	}
-}
diff --git a/src/PreviewOutputImage.H b/src/PreviewOutputImage.H
deleted file mode 100644
index f37493b..0000000
--- a/src/PreviewOutputImage.H
+++ /dev/null
@@ -1,34 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef PREVIEWOUTPUTIMAGE_H
-#define PREVIEWOUTPUTIMAGE_H
-
-#include <stdio.h>
-
-#include <FL/Fl_Widget.H>
-#include <FL/Fl_Image.H>
-
-#include "OutputImage.H"
-
-class PreviewOutputImage : public OutputImage , public Fl_Widget {
-	private:
-		uchar *data;
-		int d;
-
-	protected:
-		int init_internal();
-		int set_pixel_internal(int x, int r, int g, int b);	
-		int next_line_internal();
-
-	public:
-		PreviewOutputImage(int X, int Y, int W, int H);
-		~PreviewOutputImage();
-
-		void draw();
-};
-
-#endif
diff --git a/src/PreviewOutputImage.cxx b/src/PreviewOutputImage.cxx
deleted file mode 100644
index 560f044..0000000
--- a/src/PreviewOutputImage.cxx
+++ /dev/null
@@ -1,65 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#include <FL/Fl.H>
-#include <FL/fl_draw.H>
-
-#include "PreviewOutputImage.H"
-
-PreviewOutputImage::PreviewOutputImage(int X, int Y, int W, int H):
-	OutputImage(), Fl_Widget(X, Y, W, H) {
-	d = 3;
-	data = NULL;
-}
-
-PreviewOutputImage::~PreviewOutputImage() {
-	if (data)
-		free(data);
-}
-
-int
-PreviewOutputImage::init_internal() {
-	data = (uchar*) malloc(W * H * d);
-	memset(data, 0, W * H * d);
-	size(W, H);
-	return 0;
-}
-
-int
-PreviewOutputImage::set_pixel_internal(int x, int r, int g, int b) {
-	if (!data) 
-		return 1;
-
-	long index = (line * w() * d + (x * d));
-	*(data+index+0) = (unsigned char) (r / 255);
-	*(data+index+1) = (unsigned char) (g / 255);
-	*(data+index+2) = (unsigned char) (b / 255);
-
-	return 0;
-}
-
-int
-PreviewOutputImage::next_line_internal() {
-	if (line % 10 == 0) {
-		redraw();
-		Fl::check();
-	}
-	return 0;
-}
-
-void
-PreviewOutputImage::draw() {
-	if (!data)
-		return;
-
-	fl_push_clip(x(), y(), w(), h());
-	fl_draw_image(data, x(), y(), w(), h(), d);
-	fl_pop_clip();
-}
diff --git a/src/ProjectionCylindrical.H b/src/ProjectionCylindrical.H
deleted file mode 100644
index 06709c4..0000000
--- a/src/ProjectionCylindrical.H
+++ /dev/null
@@ -1,33 +0,0 @@
-//
-// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef PROJECTIONCYLINDRICAL_H
-#define PROJECTIONCYLINDRICAL_H
-
-#include "ProjectionLSQ.H"
-
-class ProjectionCylindrical : public ProjectionLSQ {
-	public:
-
-		virtual double get_view_angle() {return 6.2831853;}; /* 360 deg */
-		virtual int comp_params(const Hills *h, ViewParams *parms);
-
-#define ARGS double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick
-		virtual double mac_x(ARGS);
-		virtual double mac_y(ARGS);
-		virtual double mac_x_dc_view(ARGS);
-		virtual double mac_x_dc_nick(ARGS);
-		virtual double mac_x_dc_tilt(ARGS);
-		virtual double mac_x_dscale(ARGS);
-		virtual double mac_y_dc_view(ARGS);
-		virtual double mac_y_dc_nick(ARGS);
-		virtual double mac_y_dc_tilt(ARGS);
-		virtual double mac_y_dscale(ARGS);
-#undef ARGS
-
-};
-
-#endif
diff --git a/src/ProjectionCylindrical.cxx b/src/ProjectionCylindrical.cxx
deleted file mode 100644
index 094b494..0000000
--- a/src/ProjectionCylindrical.cxx
+++ /dev/null
@@ -1,26 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <math.h>
-
-#include "ProjectionCylindrical.H"
-
-#include "ProjectionCylindrical_funcs.cxx"
-
-int
-ProjectionCylindrical::comp_params(const Hills *h, ViewParams *parms) {
-	Hills h_monotone(h);
-
-	h_monotone.sort(Hills::SORT_X);
-
-	// ensure that alpha is increasing with x.
-	for (int i = 1; i < h_monotone.get_num(); i++)
-		if (h_monotone.get(i)->alph < h_monotone.get(i - 1)->alph)
-			h_monotone.get(i)->alph += asin(1.0) * 4.0; // += 2pi
-
-	return ProjectionLSQ::comp_params(&h_monotone, parms);
-}
diff --git a/src/ProjectionLSQ.H b/src/ProjectionLSQ.H
deleted file mode 100644
index a380b4c..0000000
--- a/src/ProjectionLSQ.H
+++ /dev/null
@@ -1,59 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef PROJECTIONLSQ_H
-#define PROJECTIONLSQ_H
-
-#include "Hill.H"
-#include "ViewParams.H"
-
-class ProjectionLSQ {
-	private:
-		double comp_scale(double alph_a, double alph_b, double d1, double d2);
-
-		int lsq(const Hills *m, ViewParams *parms, int distortion_correct);
-
-	protected:
-		static double pi;
-		double sec(double a);
-
-	public:
-		typedef enum {
-			RECTILINEAR = 0,
-			CYLINDRICAL = 1
-		} Projection_t;
-
-		ProjectionLSQ() {};
-		virtual ~ProjectionLSQ() {};
-
-		void get_coordinates(double a_view, double a_nick,
-			const ViewParams *parms, double *x, double *y);
-
-		virtual int comp_params(const Hills *h, ViewParams *parms);
-
-		virtual double get_view_angle();
-
-#define ARGS double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick
-		virtual double mac_x(ARGS);
-		virtual double mac_y(ARGS);
-		virtual double mac_x_dc_view(ARGS);
-		virtual double mac_x_dc_nick(ARGS);
-		virtual double mac_x_dc_tilt(ARGS);
-		virtual double mac_x_dscale(ARGS);
-		virtual double mac_x_dk0(ARGS);
-		virtual double mac_x_dk1(ARGS);
-		virtual double mac_x_dx0(ARGS);
-		virtual double mac_y_dc_view(ARGS);
-		virtual double mac_y_dc_nick(ARGS);
-		virtual double mac_y_dc_tilt(ARGS);
-		virtual double mac_y_dscale(ARGS);
-		virtual double mac_y_dk0(ARGS);
-		virtual double mac_y_dk1(ARGS);
-		virtual double mac_y_dx0(ARGS);
-#undef ARGS
-
-};
-#endif
diff --git a/src/ProjectionLSQ.cxx b/src/ProjectionLSQ.cxx
deleted file mode 100644
index bcbb206..0000000
--- a/src/ProjectionLSQ.cxx
+++ /dev/null
@@ -1,294 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-
-#include <gsl/gsl_rng.h>
-#include <gsl/gsl_randist.h>
-#include <gsl/gsl_vector.h>
-#include <gsl/gsl_blas.h>
-#include <gsl/gsl_multifit_nlin.h>
-
-#include "ProjectionLSQ.H"
-
-double ProjectionLSQ::pi = asin(1.0) * 2.0;
-
-double
-ProjectionLSQ::sec(double a) {
-	return 1.0 / cos(a);
-}
-
-double
-ProjectionLSQ::get_view_angle() {
-	return 0.0;
-}
-
-int
-ProjectionLSQ::comp_params(const Hills *h, ViewParams *parms) {
-	const Hill *m1, *m2;
-	double scale_tmp;
-	int known_hills = h->get_num();
-	ViewParams new_parms = *parms;
-
-	if (known_hills < 1) {
-		fprintf(stderr, "Please position at least 1 hill\n");
-		return 1;
-	}
-
-	m1 = h->get(0);
-	new_parms.a_center = m1->alph;
-	new_parms.a_nick   = 0.0;
-
-	if (known_hills > 1) {
-		m2 = h->get(1);
-
-		scale_tmp = comp_scale(m1->alph, m2->alph, m1->x, m2->x);
-
-		if (isnan(scale_tmp) || scale_tmp < 50.0) {
-			fprintf(stderr, "Could not determine initial scale value (%f)\n",
-				scale_tmp);
-			return 1;
-		}
-
-		new_parms.scale    = scale_tmp;
-		new_parms.a_tilt   = 0.0;
-	}
-
-	if (known_hills > 3) {
-		fprintf(stderr, "Performing calibration\n");
-		new_parms.k0 = 0.0;
-		new_parms.k1 = 0.0;
-		new_parms.x0 = 0.0;
-	}
-
-	if (known_hills == 1) {
-		lsq(h, &new_parms, 0);
-	} else if (known_hills < 4) {
-		lsq(h, &new_parms, 1);
-	} else {
-		lsq(h, &new_parms, 1);
-		lsq(h, &new_parms, 2);
-	}
-
-	if (isnan(new_parms.scale) || new_parms.scale < 50.0) {
-		fprintf(stderr, "Could not determine reasonable view parameters\n");
-		return 1;
-	}
-
-	*parms = new_parms;
-
-	return 0;
-}
-
-struct data {
-	ProjectionLSQ *p;
-	int level;
-	const Hills *h;
-	const ViewParams *old_params;
-};
-
-#define CALL(A) dat->p->A(parms.a_center, parms.a_nick, parms.a_tilt, parms.scale, parms.k0, parms.k1, parms.x0, m->alph, m->a_nick) 
-
-static int
-lsq_f (const gsl_vector * x, void *data, gsl_vector * f) {
-	struct data *dat = (struct data *) data;
-	ViewParams parms = *dat->old_params;
-
-	parms.a_center = gsl_vector_get (x, 0);
-	parms.a_nick = gsl_vector_get (x, 1);
-	if (dat->level > 0) {
-		parms.a_tilt = gsl_vector_get (x, 2);
-		parms.scale = gsl_vector_get (x, 3);
-	}
-	if (dat->level > 1) {
-		parms.k0  = gsl_vector_get (x, 4);
-		parms.k1 = gsl_vector_get (x, 5);
-		parms.x0 = gsl_vector_get (x, 6);
-	}
-
-	for (int i=0; i<dat->h->get_num(); i++) {
-		Hill *m = dat->h->get(i);
-
-		double mx = CALL(mac_x);
-		double my = CALL(mac_y);
-
-		gsl_vector_set (f, i*2, mx - m->x);
-		gsl_vector_set (f, i*2+1, my - m->y);
-	}
-
-	return GSL_SUCCESS;
-}
-
- 
-static int
-lsq_df (const gsl_vector * x, void *data, gsl_matrix * J) {
-	struct data *dat = (struct data *) data;
-	ViewParams parms = *dat->old_params;
-
-	parms.a_center = gsl_vector_get (x, 0);
-	parms.a_nick = gsl_vector_get (x, 1);
-	if (dat->level > 0) {
-		parms.a_tilt = gsl_vector_get (x, 2);
-		parms.scale = gsl_vector_get (x, 3);
-	}
-	if (dat->level > 1) {
-		parms.k0 = gsl_vector_get (x, 4);
-		parms.k1 = gsl_vector_get (x, 5);
-		parms.x0 = gsl_vector_get (x, 6);
-	}
-
-	for (int i=0; i<dat->h->get_num(); i++) {
-		Hill *m = dat->h->get(i);
-
-		gsl_matrix_set (J, 2*i, 0, CALL(mac_x_dc_view));
-		gsl_matrix_set (J, 2*i, 1, CALL(mac_x_dc_nick));
-		if (dat->level > 0) {
-			gsl_matrix_set (J, 2*i, 2, CALL(mac_x_dc_tilt));
-			gsl_matrix_set (J, 2*i, 3, CALL(mac_x_dscale));
-		}
-		if (dat->level > 1) {
-			gsl_matrix_set (J, 2*i, 4, CALL(mac_x_dk0));
-			gsl_matrix_set (J, 2*i, 5, CALL(mac_x_dk1));
-			gsl_matrix_set (J, 2*i, 6, CALL(mac_x_dx0));
-		}
-
-		gsl_matrix_set (J, 2*i+1, 0, CALL(mac_y_dc_view));
-		gsl_matrix_set (J, 2*i+1, 1, CALL(mac_y_dc_nick));
-		if (dat->level > 0) {
-			gsl_matrix_set (J, 2*i+1, 2, CALL(mac_y_dc_tilt));
-			gsl_matrix_set (J, 2*i+1, 3, CALL(mac_y_dscale));
-		}
-		if (dat->level > 1) {
-			gsl_matrix_set (J, 2*i+1, 4, CALL(mac_y_dk0));
-			gsl_matrix_set (J, 2*i+1, 5, CALL(mac_y_dk1));
-			gsl_matrix_set (J, 2*i+1, 6, CALL(mac_y_dx0));
-		}
-	}
-
-	return GSL_SUCCESS;
-}
-
-static int
-lsq_fdf (const gsl_vector * x, void *data, gsl_vector * f, gsl_matrix * J) {
-	lsq_f (x, data, f);
-	lsq_df (x, data, J);
-	 
-	return GSL_SUCCESS;
-}
-
-int
-ProjectionLSQ::lsq(const Hills *h, ViewParams *parms,
-	int level) {
-
-	const gsl_multifit_fdfsolver_type *T;
-	gsl_multifit_fdfsolver *s;
-	gsl_multifit_function_fdf f;
-	struct data dat;
-	double x_init[8];
-	gsl_vector_view x;
-	int status;
-	int num_params;
-
-	if (level == 0)
-		num_params = 2;
-	else if (level == 1)
-		num_params = 4;
-	else
-		num_params = 7;
-
-	dat.p = this;
-	dat.level = level;
-	dat.h = h;
-	dat.old_params = parms;
-
-	x_init[0] = parms->a_center;
-	x_init[1] = parms->a_nick;
-	x_init[2] = parms->a_tilt;
-	x_init[3] = parms->scale;
-	x_init[4] = parms->k0;
-	x_init[5] = parms->k1;
-	x_init[6] = parms->x0;
-
-	x = gsl_vector_view_array (x_init, num_params);
-
-	f.f = &lsq_f;
-	f.df = &lsq_df;
-	f.fdf = &lsq_fdf;
-	f.n = h->get_num() * 2;
-	f.p = num_params;
-	f.params = &dat;
-
-	T = gsl_multifit_fdfsolver_lmsder;
-	s = gsl_multifit_fdfsolver_alloc (T, h->get_num() * 2, num_params);
-	gsl_multifit_fdfsolver_set (s, &f, &x.vector);
-
-	for (int i=0; i<100; i++) {
-		status = gsl_multifit_fdfsolver_iterate (s);
-		if (status) {
-			break;
-		}
-	} 
-
-	parms->a_center = gsl_vector_get(s->x, 0);
-	parms->a_nick = gsl_vector_get(s->x, 1);
-
-	if (level > 0) {
-		parms->a_tilt = gsl_vector_get(s->x, 2);
-		parms->scale = gsl_vector_get(s->x, 3);
-	}
-	if (level > 1) {
-		parms->k0 = gsl_vector_get(s->x, 4);
-		parms->k1 = gsl_vector_get(s->x, 5);
-		parms->x0 = gsl_vector_get(s->x, 6);
-	}
-
-	gsl_multifit_fdfsolver_free (s);
-
-	return 0;
-}
-
-void 
-ProjectionLSQ::get_coordinates(double alph, double a_nick,
-	const ViewParams *parms, double *x, double *y) {
-
-	// Normalize alph - parms->a_center to [-pi/2, pi/2]
-	if (alph - parms->a_center > pi)
-		alph -= 2.0 * pi;
-	else if (alph - parms->a_center < -pi)
-		alph += 2.0 * pi;
-
-	*x = mac_x(parms->a_center, parms->a_nick, parms->a_tilt, parms->scale,
-		parms->k0, parms->k1, parms->x0, alph, a_nick); 
-	*y = mac_y(parms->a_center, parms->a_nick, parms->a_tilt, parms->scale,
-		parms->k0, parms->k1, parms->x0, alph, a_nick); 
-}
-
-double
-ProjectionLSQ::comp_scale(double a1, double a2, double d1, double d2) {
-	return (fabs(d1 - d2) / fabs(a1 - a2));
-}
-
-#define ARGS double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick
-
-double ProjectionLSQ::mac_x(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dc_view(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dc_nick(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dc_tilt(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dscale(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dk0(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dk1(ARGS) {return NAN;}
-double ProjectionLSQ::mac_x_dx0(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dc_view(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dc_nick(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dc_tilt(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dscale(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dk0(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dk1(ARGS) {return NAN;}
-double ProjectionLSQ::mac_y_dx0(ARGS) {return NAN;}
diff --git a/src/ProjectionRectilinear.H b/src/ProjectionRectilinear.H
deleted file mode 100644
index 2d799e3..0000000
--- a/src/ProjectionRectilinear.H
+++ /dev/null
@@ -1,38 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef PROJECTIONRECTILINEAR_H
-#define PROJECTIONRECTILINEAR_H
-
-#include "ProjectionLSQ.H"
-
-class ProjectionRectilinear : public ProjectionLSQ {
-	public:
-
-		virtual double get_view_angle() {return 1.0471976;}; /* 60 deg */
-
-#define ARGS double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick
-		virtual double mac_x(ARGS);
-		virtual double mac_y(ARGS);
-		virtual double mac_x_dc_view(ARGS);
-		virtual double mac_x_dc_nick(ARGS);
-		virtual double mac_x_dc_tilt(ARGS);
-		virtual double mac_x_dscale(ARGS);
-		virtual double mac_x_dk0(ARGS);
-		virtual double mac_x_dk1(ARGS);
-		virtual double mac_x_dx0(ARGS);
-		virtual double mac_y_dc_view(ARGS);
-		virtual double mac_y_dc_nick(ARGS);
-		virtual double mac_y_dc_tilt(ARGS);
-		virtual double mac_y_dscale(ARGS);
-		virtual double mac_y_dk0(ARGS);
-		virtual double mac_y_dk1(ARGS);
-		virtual double mac_y_dx0(ARGS);
-#undef ARGS
-
-};
-
-#endif
diff --git a/src/ProjectionRectilinear.cxx b/src/ProjectionRectilinear.cxx
deleted file mode 100644
index 33cb3a7..0000000
--- a/src/ProjectionRectilinear.cxx
+++ /dev/null
@@ -1,12 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <math.h>
-
-#include "ProjectionRectilinear.H"
-
-#include "ProjectionRectilinear_funcs.cxx"
diff --git a/src/ScanImage.H b/src/ScanImage.H
deleted file mode 100644
index 1c1b91a..0000000
--- a/src/ScanImage.H
+++ /dev/null
@@ -1,31 +0,0 @@
-//
-// Copyright 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef ScanImage_H
-#define ScanImage_H
-
-#include <FL/Fl_Image.H>
-
-class ScanImage {
-	private:
-		static int get_pixel_nearest(Fl_Image *img, double x, double y,
-			int *r, int *g, int *b);
-		static int get_pixel_bicubic(Fl_Image *img, double x, double y,
-			int *r, int *g, int *b);
-		static int get_pixel(Fl_Image *img, int x, int y,
-			int *r, int *g, int *b);
-
-	public:
-		typedef enum {
-			NEAREST  = 0,
-			BICUBIC  = 1
-		} mode_t;
-
-		static int get_pixel(Fl_Image *img, mode_t mode,
-			double x, double y, int *r, int *g, int *b);
-};
-
-#endif
diff --git a/src/ScanImage.cxx b/src/ScanImage.cxx
deleted file mode 100644
index 39f66a7..0000000
--- a/src/ScanImage.cxx
+++ /dev/null
@@ -1,118 +0,0 @@
-//
-// Copyright 2007-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <math.h>
-
-#include <FL/Fl_Image.H>
-#include "ScanImage.H"
-
-int
-ScanImage::get_pixel(Fl_Image *img, mode_t mode,
-	double x, double y, int *r, int *g, int *b) {
-	if (mode == BICUBIC)
-		return get_pixel_bicubic(img, x, y, r, g, b);
-	else
-		return get_pixel_nearest(img, x, y, r, g, b);
-}
-
-int
-ScanImage::get_pixel_nearest(Fl_Image *img, double x, double y,
-    int *r, int *g, int *b) {
-
-    if (isnan(x) || isnan(y))
-        return 1;
-    else
-        return get_pixel(img, (int) rint(x), (int) rint(y), r, g, b);
-}
-
-static inline double
-interp_cubic(double x, double x2, double x3, double *v) {
-    double a0, a1, a2, a3;
-
-    a0 = v[3] - v[2] - v[0] + v[1];
-    a1 = v[0] - v[1] - a0;
-    a2 = v[2] - v[0];
-    a3 = v[1];
-
-    return a0 * x3 + a1 * x2 + a2 * x + a3;
-}
-
-int
-ScanImage::get_pixel_bicubic(Fl_Image *img, double x, double y,
-    int *r, int *g, int *b) {
-
-    double fl_x = floor(x);
-    double fl_y = floor(y);
-    double dx = x - fl_x, dx2 = dx * dx, dx3 = dx2 * dx;
-    double dy = y - fl_y, dy2 = dy * dy, dy3 = dy2 * dy;
-    int ic[3];
-    double c[3][4];
-    double c1[3][4];
-
-    for (int iy = 0; iy < 4; iy++) {
-        for (int ix = 0; ix < 4; ix++) {
-
-            if (get_pixel(img, (int) fl_x + ix - 1, (int) fl_y + iy - 1,
-                    &ic[0], &ic[1], &ic[2]) != 0)
-                return 1;
-
-            for (int l = 0; l < 3; l++)
-                c[l][ix] = (double) ic[l];
-        }
-
-        for (int l = 0; l < 3; l++)
-            c1[l][iy] = interp_cubic(dx, dx2, dx3, c[l]);
-    }
-
-    *r = (int) rint(interp_cubic(dy, dy2, dy3, c1[0]));
-    *g = (int) rint(interp_cubic(dy, dy2, dy3, c1[1]));
-    *b = (int) rint(interp_cubic(dy, dy2, dy3, c1[2]));
-    return 0;
-}
-
-int
-ScanImage::get_pixel(Fl_Image *img, int x, int y,
-                     int *r, int *g, int *b) {
-    if ( img->d() == 0 )
-        return 1;
-
-    if (x < 0 || x >=img->w() || y < 0 || y >= img->h())
-        return 1;
-
-    long index = (y * img->w() * img->d()) + (x * img->d()); // X/Y -> buf index  
-    switch (img->count()) {
-        case 1:
-        {                                            // bitmap
-            const unsigned char *buf = (const unsigned char*) img->data()[0];
-            switch (img->d())
-            {
-                case 1:
-                    *r = *g = *b = *(buf+index);
-                    break;
-                case 3:                              // 24bit
-                    *r = (int) *(buf+index+0);
-                    *g = (int) *(buf+index+1);
-                    *b = (int) *(buf+index+2);
-                    break;
-                default:                             // ??
-                    printf("Not supported: chans=%d\n", img->d());
-                    return 1;
-            }
-            break;
-        }
-        default:                                             // ?? pixmap, bit vals
-        printf("Not supported: count=%d\n", img->count());
-        return 1;
-    }
-
-    *r = *r * 255;
-    *g = *g * 255;
-    *b = *b * 255;
-
-    return 0;
-}
diff --git a/src/ScreenDump.H b/src/ScreenDump.H
deleted file mode 100644
index 8564054..0000000
--- a/src/ScreenDump.H
+++ /dev/null
@@ -1,26 +0,0 @@
-//
-// Copyright 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef SCREENDUMP_H
-#define SCREENDUMP_H
-
-#include <FL/Fl_Widget.H>
-
-#include "OutputImage.H"
-
-class ScreenDump {
-	private:
-		int w, h;
-		unsigned char * rgb;
-
-	public:
-		ScreenDump(Fl_Widget *widget);
-		~ScreenDump();
-
-		int save(OutputImage *out);
-};
-
-#endif
diff --git a/src/ScreenDump.cxx b/src/ScreenDump.cxx
deleted file mode 100644
index f331a76..0000000
--- a/src/ScreenDump.cxx
+++ /dev/null
@@ -1,59 +0,0 @@
-//
-// Copyright 2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <FL/Fl.H>
-#include <FL/x.H>
-#include <FL/fl_draw.H>
-
-#include "ScreenDump.H"
-
-ScreenDump::ScreenDump(Fl_Widget *widget) {
-	Fl_Offscreen offscreen;
-	int x, y;
-
-	x = widget->x();
-	y = widget->y();
-	w = widget->w();
-	h = widget->h();
-
-	Fl::flush();
-	widget->resize(0, 0, w, h);
-
-	offscreen = fl_create_offscreen(w, h);
-	fl_begin_offscreen(offscreen);
-	widget->redraw();
-	widget->draw();
-	fl_color(FL_YELLOW);
-	fl_draw("created with gipfel", w - 80, h - 10);
-	rgb = fl_read_image(NULL, 0, 0, w, h);
-	fl_end_offscreen();
-	fl_delete_offscreen(offscreen);
-
-	widget->resize(x, y, w, h);
-}
-
-ScreenDump::~ScreenDump() {
-	if (rgb)
-		delete[] rgb;
-}
-
-int
-ScreenDump::save(OutputImage *out) {
-	if (!rgb)
-		return 1;
-
-	out->init(w, h);
-
-	for (int y = 0; y < h; y++) {
-		for (int x = 0; x < w; x++) {
-			unsigned char *px = &rgb[(y * w + x) * 3];
-			out->set_pixel(x, px[0] * 255, px[1] * 255, px[2] * 255);
-		}
-		out->next_line();
-	}
-
-	return out->done();
-}
diff --git a/src/Stitch.H b/src/Stitch.H
deleted file mode 100644
index 7c9a60e..0000000
--- a/src/Stitch.H
+++ /dev/null
@@ -1,32 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef STITCH_H
-#define STITCH_H
-
-#include "GipfelWidget.H"
-#include "OutputImage.H"
-#include "ScanImage.H"
-
-#define MAX_PICS 256
-
-class Stitch {
-	private:
-		GipfelWidget *gipf[MAX_PICS];
-		int num_pics;
-		OutputImage *merged_image;
-
-	public:
-		Stitch();
-		~Stitch();
-
-		int load_image(char *file);
-		OutputImage * set_output(OutputImage *img);
-		int resample(ScanImage::mode_t m,
-			int w, int h, double view_start, double view_end);
-};
-
-#endif
diff --git a/src/Stitch.cxx b/src/Stitch.cxx
deleted file mode 100644
index 7b9fc04..0000000
--- a/src/Stitch.cxx
+++ /dev/null
@@ -1,117 +0,0 @@
-//
-// Copyright 2007-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <math.h>
-#include <algorithm>
-
-#include <gsl/gsl_multifit.h>
-
-#include <FL/Fl.H>
-
-#include "OutputImage.H"
-#include "Stitch.H"
-
-#define MAX_VALUE 65025
-
-static double pi_d = asin(1.0) * 2.0;
-static double deg2rad = pi_d / 180.0;
-
-Stitch::Stitch() {
-	for (int i = 0; i < MAX_PICS; i++)
-		gipf[i] = NULL;
-
-	merged_image = NULL;
-	num_pics = 0;
-}
-
-Stitch::~Stitch() {
-	for (int i = 0; i < MAX_PICS; i++)
-		if (gipf[i])
-			delete gipf[i];
-		else
-			break;
-}
-
-int
-Stitch::load_image(char *file) {
-	for (int i = 0; i < MAX_PICS; i++) {
-		if (gipf[i] == NULL) {
-			gipf[i] = new GipfelWidget(0, 0, 800, 600, NULL);
-			if (gipf[i]->load_image(file) != 0) {
-				delete gipf[i];
-				gipf[i] = NULL;
-			} else {
-				num_pics++;
-			}
-			break;
-		}
-	}
-
-	return 0;
-}
-
-OutputImage*
-Stitch::set_output(OutputImage *img) {
-	OutputImage *ret = merged_image;
-	merged_image = img;
-	return ret;
-}
-
-int
-Stitch::resample(ScanImage::mode_t m,
-	int w, int h, double view_start, double view_end) {
-
-	view_start = view_start * deg2rad;
-	view_end = view_end * deg2rad;
-
-	double step_view = (view_end - view_start) / w;
-	int r, g, b;
-	int y_off = h / 2;
-	int merged_pixel_set;
-	double radius = (double) w / (view_end -view_start);
-
-	if (merged_image)
-		if (merged_image->init(w, h) != 0)
-			merged_image = NULL;
-
-	for (int y = 0; y < h; y++) {
-		double a_nick = atan((double)(y_off - y)/radius);
-
-		for (int x = 0; x < w; x++) {
-			double a_view;
-			a_view = view_start + x * step_view;
-			merged_pixel_set = 0;
-			for (int i = 0; i < num_pics; i++) {
-				if (merged_pixel_set)
-					continue;
-
-				if (gipf[i]->get_pixel(m, a_view, a_nick,
-						&r, &g, &b) == 0) {
-
-					r = std::max(std::min(r, MAX_VALUE), 0);
-					g = std::max(std::min(g, MAX_VALUE), 0);
-					b = std::max(std::min(b, MAX_VALUE), 0);
-
-					if (!merged_pixel_set && merged_image) {
-						merged_image->set_pixel(x, r, g, b);
-						merged_pixel_set++;
-					}
-				}
-			}
-		}
-
-		if (merged_image)
-			merged_image->next_line();
-	}
-
-	if (merged_image)
-		merged_image->done();
-
-	return 0;
-}
diff --git a/src/TIFFOutputImage.H b/src/TIFFOutputImage.H
deleted file mode 100644
index b5409eb..0000000
--- a/src/TIFFOutputImage.H
+++ /dev/null
@@ -1,33 +0,0 @@
-//
-// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef TIFFOUTPUTIMAGE_H
-#define TIFFOUTPUTIMAGE_H
-
-#include <stdio.h>
-#include <tiffio.h>
-
-#include "OutputImage.H"
-
-class TIFFOutputImage : public OutputImage {
-	private:
-		int bitspersample;
-		unsigned char *row;
-		char *file;
-		TIFF *tiff;
-
-	protected:
-		int init_internal();
-		int set_pixel_internal(int x, int r, int g, int b);	
-		int next_line_internal();
-		int done_internal();
-
-	public:
-		TIFFOutputImage(const char *file, int b = 8);
-		~TIFFOutputImage();
-};
-
-#endif
diff --git a/src/TIFFOutputImage.cxx b/src/TIFFOutputImage.cxx
deleted file mode 100644
index e9f6a2b..0000000
--- a/src/TIFFOutputImage.cxx
+++ /dev/null
@@ -1,97 +0,0 @@
-//
-// Copyright 2006 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "TIFFOutputImage.H"
-
-TIFFOutputImage::TIFFOutputImage(const char *f, int b) : OutputImage () {
-	bitspersample = (b==16)?16:8;
-	file = strdup(f);
-	tiff = NULL;
-	row = NULL;
-}
-
-TIFFOutputImage::~TIFFOutputImage() {
-	if (row)
-		free(row);
-
-	if (file)
-		free(file);
-}
-
-int
-TIFFOutputImage::init_internal() {
-	if (row)
-		free(row);
-	row = NULL;
-
-	row = (unsigned char*) calloc((bitspersample / 8) * 4 * W, sizeof(char));
-	if (!row) {
-		perror("calloc");
-		return 1;
-	}
-
-	if (tiff)
-		TIFFClose(tiff);
-
-	if ((tiff = TIFFOpen(file, "w")) == NULL){
-		fprintf(stderr, "can't open %s\n", file);
-		return 1;
-	}
-
-	TIFFSetField(tiff, TIFFTAG_IMAGEWIDTH, W);
-	TIFFSetField(tiff, TIFFTAG_IMAGELENGTH, H);
-	TIFFSetField(tiff, TIFFTAG_COMPRESSION, COMPRESSION_DEFLATE);
-	TIFFSetField(tiff, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
-	TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
-	TIFFSetField(tiff, TIFFTAG_ROWSPERSTRIP, 1);
-	TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, bitspersample);
-	TIFFSetField(tiff, TIFFTAG_SAMPLESPERPIXEL, 4);
-
-	return 0;
-}
-
-int
-TIFFOutputImage::set_pixel_internal(int x, int r, int g, int b) {
-	if (bitspersample == 8) {	
-		row[x*4+0] = (unsigned char) (r / 255);
-		row[x*4+1] = (unsigned char) (g / 255);
-		row[x*4+2] = (unsigned char) (b / 255);
-		row[x*4+3] = 255;
-	} else if (bitspersample == 16) {
-		unsigned short *row16 = (unsigned short*) row;
-		row16[x*4+0] = (unsigned short) r;
-		row16[x*4+1] = (unsigned short) g;
-		row16[x*4+2] = (unsigned short) b;
-		row16[x*4+3] = 65025;
-	}
-
-	return 0;
-}
-
-int
-TIFFOutputImage::next_line_internal() {
-	TIFFWriteEncodedStrip(tiff, line - 1 , row, W * (bitspersample / 8) * 4);
-
-	memset(row, 0, (bitspersample / 8) * 4 * W * sizeof(char));
-	return 0;
-}
-
-int
-TIFFOutputImage::done_internal() {
-	if (tiff)
-		TIFFClose(tiff);
-	tiff = NULL;
-
-	if (row)
-		free(row);
-	row = NULL;
-
-	return 0;
-}	
diff --git a/src/ViewParams.H b/src/ViewParams.H
deleted file mode 100644
index b53a8df..0000000
--- a/src/ViewParams.H
+++ /dev/null
@@ -1,21 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef VIEWPARAMS_H
-#define VIEWPARAMS_H
-
-class ViewParams {
-	public:
-		double a_center;
-		double scale;
-		double a_nick;
-		double a_tilt;
-		double k0;
-		double k1;
-		double x0;
-};
-
-#endif
diff --git a/src/choose_hill.H b/src/choose_hill.H
deleted file mode 100644
index 27105dc..0000000
--- a/src/choose_hill.H
+++ /dev/null
@@ -1,15 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#ifndef CHOOSE_HILL_H
-#define CHOOSE_HILL_H
-
-#include "Fl_Search_Chooser.H"
-#include "Hill.H"
-
-Hill *choose_hill(const Hills *hills, const char *l);
-
-#endif
diff --git a/src/choose_hill.cxx b/src/choose_hill.cxx
deleted file mode 100644
index 48e44d5..0000000
--- a/src/choose_hill.cxx
+++ /dev/null
@@ -1,43 +0,0 @@
-//
-// Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <string.h>
-#include <FL/Fl.H>
-#include "choose_hill.H"
-
-Hill*
-choose_hill(const Hills *hills, const char *l) {
-	Fl_Search_Chooser *sc = new Fl_Search_Chooser(l?l:"Choose Hill");
-	Hills *h_sort = new Hills(hills);
-	Hill *ret;
-
-	h_sort->sort(Hills::SORT_NAME);
-
-	for (int i=0; i<h_sort->get_num(); i++) {
-		char buf[256];
-
-		Hill *m = h_sort->get(i);
-		if (m->flags & (Hill::DUPLIC | Hill::TRACK_POINT))
-			continue;
-
-		snprintf(buf, sizeof(buf) - 1, "%s (%dm)", m->name, (int) m->height);
-		buf[sizeof(buf) - 1] = '\0';
-		sc->add(buf, m);
-	} 
-
-	delete h_sort;
-
-	sc->show();
-
-	while (sc->shown())
-		Fl::wait();
-
-	ret = (Hill*) sc->data();
-	delete sc;
-
-	return ret;
-}
diff --git a/src/expr2c.mac b/src/expr2c.mac
deleted file mode 100644
index 1522169..0000000
--- a/src/expr2c.mac
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
- */
-
-load("stringproc")$
-
-varsubst(v) := ssubst("_", "%", string(v))$
-
-printdecl(vars) := (
-	sprint("double", varsubst(first(vars))),
-	for v in rest(vars) do sprint(",", varsubst(v)),
-	sprint(";"))$
-
-printdef(expr) := sprint(varsubst(first(expr)), "=", varsubst(second(expr)), ";")$
-
-block2c(expr) := 
-	if ?equal(op(expr), block) then (
-		printdecl(first(expr)),
-		for d in reverse(rest(reverse(rest(expr)))) do printdef(d),
-		sprint("return", varsubst(last(expr)), ";"))
-	else
-		sprint("return", varsubst(expr), ";")$
-
-expr2c(funcname, argstr, expr) := (
-	sprint("double", funcname, "(", argstr, ") {"),
-	block2c(subst(pow, "^", optimize(expr))),
-	sprint("}", "
-"))$
diff --git a/src/gipfel.cxx b/src/gipfel.cxx
deleted file mode 100644
index bed5035..0000000
--- a/src/gipfel.cxx
+++ /dev/null
@@ -1,738 +0,0 @@
-//
-// Copyright 2007-2023 Johannes Hofmann <Johannes.Hofmann@gmx.de>
-//
-// This software may be used and distributed according to the terms
-// of the GNU General Public License, incorporated herein by reference.
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <libgen.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <math.h>
-#include <assert.h>
-#include <algorithm>
-
-#include <FL/Fl.H>
-#include <FL/Fl_Window.H>
-#include <FL/Fl_Scroll.H>
-#include <FL/Fl_File_Chooser.H>
-#include <FL/Fl_Input.H>
-#include <FL/Fl_Int_Input.H>
-#include <FL/Fl_Menu_Bar.H>
-#include <FL/Fl_Menu_Item.H>
-#include <FL/Fl_Valuator.H>
-#include <FL/Fl_Value_Slider.H>
-#include <FL/Fl_Value_Input.H>
-#include <FL/Fl_Text_Display.H>
-#include <FL/Fl_Text_Buffer.H>
-
-#include "Fl_Value_Dial.H"
-#include "Fl_Search_Chooser.H"
-#include "GipfelWidget.H"
-#include "JPEGOutputImage.H"
-#include "TIFFOutputImage.H"
-#include "PreviewOutputImage.H"
-#include "Stitch.H"
-#include "ScreenDump.H"
-#include "choose_hill.H"
-#include "../config.h"
-
-#ifndef STD_DATADIR
-#define STD_DATADIR "/usr/local/share"
-#endif
-
-#define GIPFEL_DATADIR STD_DATADIR "/" PACKAGE_NAME
-#define DATAFILE "gipfel.dat"
-
-static char *run_dir = NULL;
-static char *img_file = NULL;
-static char *data_file = NULL;
-
-static GipfelWidget *gipf = NULL;
-static Fl_Scroll *scroll;
-static Fl_Window *control_win, *view_win;
-static Fl_Dial *s_center = NULL;
-static Fl_Slider *s_nick, *s_focal_length, *s_tilt, *s_height_dist, *s_track_width;
-static Fl_Value_Input *i_view_lat, *i_view_long, *i_view_height;
-static Fl_Value_Input *i_distortion_k0, *i_distortion_k1, *i_distortion_x0;
-static Fl_Box *b_viewpoint;
-static Fl_Menu_Bar *mb;
-
-#define STITCH_PREVIEW           1
-#define STITCH_JPEG              2
-#define STITCH_TIFF              4
-
-static int stitch(ScanImage::mode_t m , int b_16,
-	int stitch_w, int stitch_h,
-	double from, double to, int type, const char *path, int argc, char **argv);
-
-static int export_hills(const char *export_file, double visibility);
-static int export_position();
-
-static int
-confirm_overwrite(const char *f) {
-    struct stat sb;
-
-    if (stat(f, &sb) == 0)
-        return fl_choice("%s exists.\n", "Cancel", "Overwrite", NULL, f);
-    else
-        return 1;
-}
-
-static char *
-file_installed_or_local(const char *inst_dir, const char *name) {
-	assert(run_dir);
-
-	struct stat sb;
-	int buflen = strlen(inst_dir) + strlen(run_dir) + strlen(name) + 1;
-	char *buf = (char *) malloc (buflen);
-
-	snprintf(buf, buflen, "%s/%s", inst_dir, name);
-	if (stat(buf, &sb) == 0)
-		return buf;
-
-	snprintf(buf, buflen, "%s/../%s", run_dir, name);
-	if (stat(buf, &sb) == 0)
-		return buf;
-
-	free(buf);
-	return NULL;
-}
-
-void set_values() {
-	double k0 = 0.0, k1 = 0.0, x0 = 0.0;
-
-	s_center->value(gipf->get_center_angle());
-	s_nick->value(gipf->get_nick_angle());
-	s_focal_length->value(gipf->get_focal_length_35mm());
-	s_tilt->value(gipf->get_tilt_angle());
-	s_height_dist->value(gipf->get_height_dist_ratio());
-	i_view_lat->value(gipf->get_view_lat());
-	i_view_long->value(gipf->get_view_long());
-	i_view_height->value(gipf->get_view_height());
-	b_viewpoint->label(gipf->get_viewpoint());
-	if (gipf->projection() == ProjectionLSQ::RECTILINEAR) {
-		mb->mode(9, FL_MENU_RADIO|FL_MENU_VALUE);
-		mb->mode(10, FL_MENU_RADIO);
-	} else {
-		mb->mode(10, FL_MENU_RADIO|FL_MENU_VALUE);
-		mb->mode(9, FL_MENU_RADIO);
-	}
-
-	gipf->get_distortion_params(&k0, &k1, &x0);
-	i_distortion_k0->value(k0);
-	i_distortion_k1->value(k1);
-	i_distortion_x0->value(x0);
-}
-
-void quit_cb() {
-	if (Fl::event() == FL_SHORTCUT && Fl::event_key() == FL_Escape) 
-		return; // ignore Escape
-	exit(0);
-}
-
-void open_cb() {
-	char *file = fl_file_chooser("Open File?", "*.jpg", img_file);
-	if (file) {
-		gipf->load_image(file);
-		scroll->position(0, 0);
-		view_win->label(file);
-		view_win->redraw();
-		control_win->label(file);
-		set_values();
-		if (img_file)
-			free(img_file);
-		img_file = strdup(file);
-	}  
-}
-
-void track_cb() {
-	char *file = fl_file_chooser("Track File?", NULL, NULL);
-	if (file && gipf->load_track(file) == 0)
-		s_track_width->activate();
-}
-
-void save_cb() {
-	char *file = fl_file_chooser("Save Image As?", NULL, img_file);
-	if (file && confirm_overwrite(file))
-		if (gipf->save_image(file))
-			fl_message("ERROR: Saving image %s failed.", file);	
-}
-
-void dump_cb(Fl_Widget * o, void*) {
-	fl_cursor(FL_CURSOR_WAIT);
-	ScreenDump dmp(gipf); // needs to be done before fl_file_chooser()
-	fl_cursor(FL_CURSOR_DEFAULT);
-	char *file = fl_file_chooser("Save Screen Dump As?", "*.jpg", NULL);
-	if (file && confirm_overwrite(file)) {
-		JPEGOutputImage out(file, 95);
-		if (dmp.save(&out))
-			fl_message("ERROR: Saving image %s failed.", file);	
-	}
-}
-
-void focal_length_cb(Fl_Slider* o, void*) {
-	gipf->set_focal_length_35mm(o->value());
-}
-
-void angle_cb(Fl_Slider* o, void*) {
-	gipf->set_center_angle(o->value());
-}
-
-void nick_cb(Fl_Slider* o, void*) {
-	gipf->set_nick_angle(o->value());
-}
-
-void tilt_cb(Fl_Slider* o, void*) {
-	gipf->set_tilt_angle(o->value());
-}
-
-void h_d_cb(Fl_Slider* o, void*) {
-	gipf->set_height_dist_ratio(o->value());
-}
-
-void view_lat_cb(Fl_Value_Input* o, void*) {
-	gipf->set_view_lat(o->value());
-}
-
-void view_long_cb(Fl_Value_Input* o, void*) {
-	gipf->set_view_long(o->value());
-}
-
-void view_height_cb(Fl_Value_Input* o, void*) {
-	gipf->set_view_height(o->value());
-}
-
-void track_width_cb(Fl_Value_Input* o, void*) {
-	gipf->set_track_width(o->value());
-}
-
-void viewpoint_cb(Fl_Value_Input* o, void*) {
-	Hill *m = choose_hill(gipf->get_mountains(), "Choose Viewpoint");
-	if (m) {
-		gipf->set_viewpoint(m);
-		set_values();
-	}
-}
-
-void proj_cb(Fl_Value_Input* o, void*d) {
-	if (d)
-		gipf->projection(ProjectionLSQ::CYLINDRICAL);
-	 else 
-		 gipf->projection(ProjectionLSQ::RECTILINEAR);
-}
-
-void hidden_cb(Fl_Menu_* o, void*d) {
-	gipf->set_show_hidden(o->mvalue()->value() != 0); 
-}
-
-void save_distortion_cb(Fl_Widget *, void *) {
-	char buf[1024];
-	const char * prof_name;
-	double k0, k1, x0;
-
-	buf[0] = '\0';
-	gipf->get_distortion_params(&k0, &k1, &x0);
-
-	gipf->get_distortion_profile_name(buf, sizeof(buf));
-	prof_name = fl_input("Save Distortion Profile (k0=%f, k1=%f, x0=%f)",
-		buf, k0, k1, x0);
-
-	if (prof_name == NULL)
-		return;
-
-	if (gipf->save_distortion_params(prof_name, 0) != 0) {
-		if (fl_choice("A profile with this name exists.\n",
-				"Cancel", "Overwrite", NULL) == 1)
-			gipf->save_distortion_params(prof_name, 1);
-	}
-	set_values();
-}
-
-void load_distortion_cb(Fl_Widget *, void *) {
-	char buf[1024];
-	const char * prof_name;
-
-	buf[0] = '\0';
-	gipf->get_distortion_profile_name(buf, sizeof(buf));
-	prof_name = fl_input("Load Distortion Profile", buf);
-
-	if (prof_name == NULL)
-		return;
-
-	if (gipf->load_distortion_params(prof_name) != 0)
-		fl_alert("Could not load profile %s.", prof_name);
-	else
-		set_values();
-}
-
-void distortion_cb(Fl_Value_Input*, void*) {
-	gipf->set_distortion_params(
-		i_distortion_k0->value(),
-		i_distortion_k1->value(),
-		i_distortion_x0->value());
-}
-
-void about_cb() {
-	fl_message("gipfel -- Photogrammetry for Mountain Images.\n"
-		"Version %s\n\n"
-		"(c) Johannes Hofmann 2006-2023\n\n"
-		"Homepage: http://flpsed.org/gipfel.html\n\n"
-		"Default datafile from http://www.viewfinderpanoramas.org/ and\n"
-        "http://www.alpin-koordinaten.de\n",
-		VERSION);
-
-}
-
-void readme_cb() {
-	char *readme = file_installed_or_local(DOCDIR, "README");
-	if (!readme) {
-		fprintf(stderr, "README file not found\n");
-		return;
-	}
-	Fl_Window *win = new Fl_Window(800, 600, "README");
-	Fl_Text_Buffer *textBuf = new Fl_Text_Buffer();
-	Fl_Text_Display *textDisp = new Fl_Text_Display(0, 0, win->w(), win->h());
-
-	textDisp->textfont(FL_COURIER);
-	textDisp->buffer(textBuf);	
-	win->resizable(textDisp);
-	textBuf->appendfile(readme);
-	free(readme);
-	win->end();
-	win->show();
-}
-
-void fill_menubar(Fl_Menu_Bar* mb) {
-	mb->add("&File/L&oad Image", FL_CTRL+'o', (Fl_Callback*)open_cb);
-	mb->add("&File/&Save Image", FL_CTRL+'s', (Fl_Callback*)save_cb);
-	mb->add("&File/Choose &Viewpoint", FL_CTRL+'v', (Fl_Callback*)viewpoint_cb);
-	mb->add("&File/Load &Track", FL_CTRL+'t', (Fl_Callback*)track_cb);
-	mb->add("&File/Screen &Dump", FL_CTRL+'d', (Fl_Callback*)dump_cb);
-	mb->add("&File/&Quit", FL_CTRL+'q', (Fl_Callback*)quit_cb);
-
-	mb->add("&Projection/Normal Projection", 0, (Fl_Callback *)proj_cb, 
-		(void *)0, FL_MENU_RADIO|FL_MENU_VALUE);
-	mb->add("&Projection/Panoramic Projection", 0, (Fl_Callback *)proj_cb, 
-		(void *)1, FL_MENU_RADIO);
-
-	mb->add("&Distortion/Load Profile", 0, (Fl_Callback *)load_distortion_cb);
-	mb->add("&Distortion/Save Profile", 0, (Fl_Callback *)save_distortion_cb);
-
-	mb->add("&Option/Show Hidden", 0, (Fl_Callback *) hidden_cb, 
-		(void *)0, FL_MENU_TOGGLE);
-
-	mb->add("&Help/Readme", 0, (Fl_Callback*)readme_cb);
-	mb->add("&Help/About", 0, (Fl_Callback*)about_cb);
-}
-
-void usage() {
-	fprintf(stderr,
-		"usage: gipfel [-v <viewpoint>] [-d <file>]\n"
-		"          [-s] [-j <file>] [-t <dir] [-w <width>] [-h <height>]\n"
-		"          [-e <file>] [-E] [-p]\n"
-		"          [<image(s)>]\n"
-		"   -v <viewpoint>  Set point from which the picture was taken.\n"
-		"                   This must be a string that unambiguously \n"
-		"                   matches the name of an entry in the data file.\n"
-		"   -d <file>       Use <file> for GPS data.\n"
-		"   -V <visibility> Set initial visibility.\n"
-		"   -u <k0>,<k1>    Use distortion correction values k0,k1.\n"
-		"   -s              Stitch mode.\n"
-		"   -4              Create 16bit output (only with TIFF stitching).\n"
-		"   -r <from>,<to>  Stitch range in degrees (e.g. 100.0,200.0).\n"
-		"   -b              Use bicubic interpolation for stitching.\n"
-		"   -w <width>      Width of result image.\n"
-		"   -h <height>     Height of result image.\n"
-		"   -j <file>       JPEG output file in Stitch mode.\n"
-		"   -t <file>       TIFF output file in Stitch mode.\n"
-		"   -p              Export position of image to stdout.\n"
-		"   -e <file>       Export positions of hills from <file> on image.\n"
-		"   -E              Export hills from default data file.\n"
-		"      <image(s)>   JPEG file(s) to use.\n");
-}
-
-Fl_Window * 
-create_control_window() {
-	Fl_Window *win = new Fl_Window(400,400);
-	mb = new Fl_Menu_Bar(0, 0, 400, 30);
-	fill_menubar(mb);
-
-	s_center = new Fl_Value_Dial(40, 60, 150, 150, NULL);
-	s_center->type(FL_LINE_DIAL);
-	s_center->labelsize(10);
-	s_center->step(0.01);
-	s_center->bounds(0.0, 360.0);
-	s_center->angles(180, 540);
-	s_center->callback((Fl_Callback*)angle_cb);
-
-	win->add(new Fl_Box(95, 40, 40, 20, "North"));
-	win->add(new Fl_Box(95, 210, 40, 20, "South"));
-	win->add(new Fl_Box(190, 125, 40, 20, "East"));
-	win->add(new Fl_Box(0, 125, 40, 20, "West"));
-
-	s_focal_length = new Fl_Value_Slider(235, 60, 160, 15, "Focal Length in 35mm");
-	s_focal_length->type(1);
-	s_focal_length->box(FL_THIN_DOWN_BOX);
-	s_focal_length->labelsize(10);
-	s_focal_length->step(0.01);
-	s_focal_length->bounds(1.0, 300.0);
-	s_focal_length->slider(FL_UP_BOX);
-	s_focal_length->callback((Fl_Callback*)focal_length_cb);
-	s_focal_length->align(FL_ALIGN_TOP);
-
-	s_nick = new Fl_Value_Slider(235, 90, 160, 15, "Nick (deg.)");
-	s_nick->type(1);
-	s_nick->box(FL_THIN_DOWN_BOX);
-	s_nick->labelsize(10);
-	s_nick->step(0.01);
-	s_nick->bounds(-40.0, 20.0);
-	s_nick->slider(FL_UP_BOX);
-	s_nick->callback((Fl_Callback*)nick_cb);
-	s_nick->align(FL_ALIGN_TOP);
-
-	s_tilt = new Fl_Value_Slider(235, 120, 160, 15, "Tilt (deg.)");
-	s_tilt->type(1);
-	s_tilt->box(FL_THIN_DOWN_BOX);
-	s_tilt->labelsize(10);
-	s_tilt->step(0.01);
-	s_tilt->bounds(-10.0, 10.0);
-	s_tilt->slider(FL_UP_BOX);
-	s_tilt->callback((Fl_Callback*)tilt_cb);
-	s_tilt->align(FL_ALIGN_TOP);
-
-	s_height_dist = new Fl_Value_Slider(235, 150, 160, 15, "Visibility");
-	s_height_dist->type(1);
-	s_height_dist->box(FL_THIN_DOWN_BOX);
-	s_height_dist->labelsize(10);
-	s_height_dist->step(-0.001);
-	s_height_dist->bounds(0.1, 0.01);
-	s_height_dist->slider(FL_UP_BOX);
-	s_height_dist->callback((Fl_Callback*)h_d_cb);
-	s_height_dist->align(FL_ALIGN_TOP);
-
-	s_track_width = new Fl_Value_Slider(235, 180, 160, 15, "Track Width");
-	s_track_width->type(1);
-	s_track_width->box(FL_THIN_DOWN_BOX);
-	s_track_width->labelsize(10);
-	s_track_width->step(1.0);
-	s_track_width->bounds(1.0, 500.0);
-	s_track_width->value(200.0);
-	s_track_width->slider(FL_UP_BOX);
-	s_track_width->callback((Fl_Callback*)track_width_cb);
-	s_track_width->align(FL_ALIGN_TOP);
-	s_track_width->deactivate();
-
-	// Viewpoint Stuff
-	b_viewpoint = new Fl_Box(FL_DOWN_BOX, 30, 305, 300, 80, "");
-	b_viewpoint->align(FL_ALIGN_TOP);
-
-	i_view_lat = new Fl_Value_Input(40, 320, 100, 20, "Latitude");
-	i_view_lat->labelsize(10);
-	i_view_lat->align(FL_ALIGN_TOP);
-	i_view_lat->when(FL_WHEN_ENTER_KEY);
-	i_view_lat->callback((Fl_Callback*)view_lat_cb);
-
-	i_view_long = new Fl_Value_Input(200, 320, 100, 20, "Longitude");
-	i_view_long->labelsize(10);
-	i_view_long->align(FL_ALIGN_TOP);
-	i_view_long->when(FL_WHEN_ENTER_KEY);
-	i_view_long->callback((Fl_Callback*)view_long_cb);
-
-	i_view_height = new Fl_Value_Input(40, 360, 80, 20, "Height");
-	i_view_height->labelsize(10);
-	i_view_height->align(FL_ALIGN_TOP);
-	i_view_height->when(FL_WHEN_ENTER_KEY);
-	i_view_height->callback((Fl_Callback*)view_height_cb);
-
-	i_distortion_k0 = new Fl_Value_Input(250, 200, 80, 20, "k0");
-	i_distortion_k0->labelsize(10);
-	i_distortion_k0->textsize(10);
-	i_distortion_k0->align(FL_ALIGN_LEFT);
-	i_distortion_k0->when(FL_WHEN_ENTER_KEY);
-	i_distortion_k0->callback((Fl_Callback*)distortion_cb);
-
-	i_distortion_k1 = new Fl_Value_Input(250, 225, 80,  20, "k1");
-	i_distortion_k1->labelsize(10);
-	i_distortion_k1->textsize(10);
-	i_distortion_k1->align(FL_ALIGN_LEFT);
-	i_distortion_k1->when(FL_WHEN_ENTER_KEY);
-	i_distortion_k1->callback((Fl_Callback*)distortion_cb);
-
-	i_distortion_x0 = new Fl_Value_Input(250, 250, 80,  20, "x0");
-	i_distortion_x0->labelsize(10);
-	i_distortion_x0->textsize(10);
-	i_distortion_x0->align(FL_ALIGN_LEFT);
-	i_distortion_x0->when(FL_WHEN_ENTER_KEY);
-	i_distortion_x0->callback((Fl_Callback*)distortion_cb);
-
-	win->end();
-	return win;
-}
-
-int main(int argc, char** argv) {
-	char c, **my_argv;
-	char *view_point = NULL;
-	int err, my_argc, sx, sy, sw, sh;
-	int stitch_flag = 0, stitch_w = 2000, stitch_h = 500;
-	int jpeg_flag = 0, tiff_flag = 0, distortion_flag = 0, position_flag = 0;
-	int export_flag = 0;
-	int bicubic_flag = 0, b_16_flag = 0;
-	double stitch_from = 0.0, stitch_to = 380.0;
-	double dist_k0 = 0.0, dist_k1 = 0.0, dist_x0 = 0.0;
-	double visibility = 0.07;
-	const char *outpath = "/tmp";
-	const char *export_file = NULL;
-
-	err = 0;
-	while ((c = getopt(argc, argv, ":?d:v:sw:h:j:t:u:br:4e:V:pE")) != EOF) {
-		switch (c) {  
-			case '?':
-				usage();
-				exit(0);
-				break;
-			case 'd':
-				data_file = optarg;
-				break;
-			case 'e':
-				export_flag++;
-				export_file = optarg;
-				break;
-			case 'E':
-				export_flag++;
-				break;
-			case 'v':
-				view_point = optarg;
-				break;
-			case 'V':
-				visibility = atof(optarg);
-				break;
-			case 's':
-				stitch_flag++;
-				break;
-			case 'p':
-				position_flag++;
-				break;
-			case '4':
-				b_16_flag++;
-				break;
-			case 'r':
-				stitch_flag++;
-				if (optarg && strcmp(optarg, ":")) {
-					stitch_from = atof(optarg);
-					if (strchr(optarg, ','))
-						stitch_to = atof(strchr(optarg, ',') + 1);
-				}
-				break;
-			case 'u':
-				char *c;
-				distortion_flag++;
-				if (optarg && strcmp(optarg, ":")) {
-					dist_k0 = atof(optarg);
-					c = strchr(optarg, ',');
-					if (c) {
-						dist_k1 = atof(strchr(optarg, ',') + 1);
-						c = strchr(c + 1, ',');
-						if (c)
-							dist_x0 = atof(strchr(optarg, ',') + 1);
-					}
-				}
-				break;
-			case 'j':
-				jpeg_flag++;
-				outpath = optarg;
-				break;
-			case 't':
-				tiff_flag++;
-				outpath = optarg;
-				break;
-			case 'w':
-				stitch_w = atoi(optarg);
-				break;
-			case 'h':
-				stitch_h = atoi(optarg);
-				break;
-			case 'b':
-				bicubic_flag++;
-				break;
-			default:
-				err++;
-		}
-	}
-
-	my_argc = argc - optind;
-	my_argv = argv + optind;
-
-	char *exec_file = strdup(argv[0]);
-	run_dir = strdup(dirname(exec_file));
-	free(exec_file);
-
-	if (my_argc >= 1)
-		img_file = strdup(my_argv[0]);
-
-	if (data_file == NULL)
-		data_file = file_installed_or_local(GIPFEL_DATADIR, "gipfel.dat");
-
-	if (data_file == NULL || err) {
-		usage();
-		exit(1);
-	}
-
-	if (stitch_flag) {
-		int type = 0;
-		if (jpeg_flag) {
-			type = STITCH_JPEG;
-		} else if (tiff_flag) {
-			type = STITCH_TIFF;
-		} else {
-			type = STITCH_PREVIEW;
-		}
-
-		return stitch(bicubic_flag ? ScanImage::BICUBIC : ScanImage::NEAREST,
-			b_16_flag,
-			stitch_w, stitch_h, stitch_from, stitch_to,
-			type, outpath, my_argc, my_argv);
-
-	} else if (export_flag) {
-		return export_hills(export_file, visibility);
-	} else if (position_flag) {
-		return export_position();
-	}
-
-	Fl::get_system_colors();
-	if (getenv("FLTK_SCHEME"))
-		Fl::scheme(NULL);
-	else
-		Fl::scheme("plastic");
-
-	control_win = create_control_window();
-	control_win->callback((Fl_Callback*) quit_cb);
-
-	view_win = new Fl_Window(800, 600);
-	view_win->callback((Fl_Callback*) quit_cb);
-
-	// The Fl_Group is used to avoid FL_DAMAGE_ALL in Fl_Scroll::position 
-	Fl_Group *g = new Fl_Group(0, 0, view_win->w(), view_win->h()); 
-	view_win->resizable(g);
-	scroll = new Fl_Scroll(0, 0, view_win->w(), view_win->h());
-
-	gipf = new GipfelWidget(0, 0, 800, 600, set_values);
-	if (img_file) {
-		gipf->load_image(img_file);
-		view_win->label(img_file);
-		control_win->label(img_file);
-	}
-
-	if (distortion_flag)
-		gipf->set_distortion_params(dist_k0, dist_k1, dist_x0);
-
-	Fl::screen_xywh(sx, sy, sw, sh);
-	view_win->size(std::min(gipf->w(), sw), std::min(gipf->h(), sh));
-	scroll->size(view_win->w(), view_win->h());
-
-	gipf->load_data(data_file);
-	gipf->set_height_dist_ratio(visibility);
-
-	scroll->end();  
-
-	set_values();
-
-	view_win->resizable(scroll);
-
-	view_win->end();
-	view_win->show(1, argv); 
-	control_win->show(1, argv); 
-
-	if (view_point)
-		gipf->set_viewpoint(view_point);
-	else if (img_file && 
-		(isnan(gipf->get_view_lat()) || isnan(gipf->get_view_long())))
-		viewpoint_cb(NULL, NULL);
-
-	return Fl::run();
-}
-
-static int
-stitch(ScanImage::mode_t m, int b_16,
-	int stitch_w, int stitch_h, double from, double to,
-	int type, const char *path, int argc, char **argv) {
-
-	Fl_Window *win;
-	Fl_Scroll *scroll;
-	Stitch *st = new Stitch();
-
-	for (int i = 0; i < argc; i++)
-		st->load_image(argv[i]);
-
-	if (type & STITCH_JPEG) {
-
-		st->set_output(new JPEGOutputImage(path, 90));
-		st->resample(m, stitch_w, stitch_h, from, to);
-
-	} else if (type & STITCH_TIFF) {
-
-		st->set_output(new TIFFOutputImage(path, b_16 ? 16 : 8));
-		st->resample(m, stitch_w, stitch_h, from, to);
-
-	} else {
-		win = new Fl_Window(0,0, stitch_w, stitch_h);
-		scroll = new Fl_Scroll(0, 0, win->w(), win->h());
-		PreviewOutputImage *img =
-			new PreviewOutputImage(0, 0, stitch_w, stitch_h);
-
-		win->resizable(scroll);
-		win->show(0, argv); 
-		st->set_output(img);
-
-		st->resample(m, stitch_w, stitch_h, from, to);
-
-		img->redraw();
-		Fl::run();
-	}
-
-	return 0;
-}
-
-static int
-export_hills(const char *export_file, double visibility) {
-	int ret;
-		
-	if (!img_file) {
-		fprintf(stderr, "export: No image file given.\n");
-		return 1;
-	}
-
-	gipf = new GipfelWidget(0,0,800,600, NULL);
-	gipf->load_image(img_file);
-	gipf->load_data(data_file);
-	gipf->set_height_dist_ratio(visibility);
-	ret = gipf->export_hills(export_file, stdout);
-	delete gipf;
-	gipf = NULL;
-
-	return ret;
-}
-
-static int
-export_position() {
-	ImageMetaData md;
-
-	if (!img_file) {
-		fprintf(stderr, "export: No image file given.\n");
-		return 1;
-	}
-
-	if (md.load_image(img_file) == 0) {
-		printf(",%s,,%f,%f,%d\n", img_file,
-			md.latitude(),
-			md.longitude(),
-			(int) rint(md.height()));
-
-		return 0;
-	} else {
-		return 1;
-	}
-}
diff --git a/src/lsq_cylindrical.mac b/src/lsq_cylindrical.mac
deleted file mode 100644
index ab706f5..0000000
--- a/src/lsq_cylindrical.mac
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
- */
-
-/*
- * cylindrical projection model
- */
-
-x : m_view - c_view$
-y : tan(c_nick - m_nick)$ 
-x_rot : y * sin(c_tilt) + x * cos(c_tilt)$
-y_rot : y * cos(c_tilt) - x * sin(c_tilt)$
-x_scale : x_rot * scale$
-y_scale : y_rot * scale$
-
-/*
- * Some mangling for C code generation
- */
-
-load("expr2c.mac")$
-
-x_expand : trigexpand(x_scale)$
-y_expand : trigexpand(y_scale)$
-
-args: "double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick"$
-
-expr2c("ProjectionCylindrical::mac_x", args, x_expand)$
-expr2c("ProjectionCylindrical::mac_y", args, y_expand)$
-
-expr2c("ProjectionCylindrical::mac_x_dc_view", args, diff(x_expand, c_view))$
-expr2c("ProjectionCylindrical::mac_x_dc_nick", args, diff(x_expand, c_nick))$
-expr2c("ProjectionCylindrical::mac_x_dc_tilt", args, diff(x_expand, c_tilt))$
-expr2c("ProjectionCylindrical::mac_x_dscale", args, diff(x_expand, scale))$
-expr2c("ProjectionCylindrical::mac_y_dc_view", args, diff(y_expand, c_view))$
-expr2c("ProjectionCylindrical::mac_y_dc_nick", args, diff(y_expand, c_nick))$
-expr2c("ProjectionCylindrical::mac_y_dc_tilt", args, diff(y_expand, c_tilt))$
-expr2c("ProjectionCylindrical::mac_y_dscale", args, diff(y_expand, scale))$
-
diff --git a/src/lsq_rectilinear.mac b/src/lsq_rectilinear.mac
deleted file mode 100644
index 95ed273..0000000
--- a/src/lsq_rectilinear.mac
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright 2006-2009 Johannes Hofmann <Johannes.Hofmann@gmx.de>
- */
-
-/*
- * rectilinear (pinhole) projection model with distortion correction
- */
-
-/* switch to cartesian coordinates */
-c_x : cos(m_nick) * cos(m_view - c_view)$
-c_y : cos(m_nick) * sin(m_view - c_view)$
-c_z : sin(m_nick)$
-
-/* nick rotation */
-c_x_rot : cos(c_nick) * c_x + sin(c_nick) * c_z$
-c_y_rot : c_y$
-c_z_rot : -sin(c_nick) * c_x + cos(c_nick) * c_z$
-
-/* pinhole projection */
-x : c_y_rot / c_x_rot$
-y : -c_z_rot / c_x_rot$ 
-
-/* rotation around view axis */
-x_rot : y * sin(c_tilt) + x * cos(c_tilt) + x0$
-y_rot : y * cos(c_tilt) - x * sin(c_tilt)$
-
-/* distortion correction */
-d : sqrt(x_rot ^ 2 + y_rot ^ 2)$
-dist_fact : d ^ 2 * k1 + d * k0$
-x_dist : x_rot * (1 + dist_fact) * scale$
-y_dist : y_rot * (1 + dist_fact) * scale$
-
-/*
- * Some mangling for C code generation
- */
-
-load("expr2c.mac")$
-
-x_expand : trigexpand(x_dist)$
-y_expand : trigexpand(y_dist)$
-
-args: "double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick"$
-
-expr2c("ProjectionRectilinear::mac_x", args, x_expand)$
-expr2c("ProjectionRectilinear::mac_y", args, y_expand)$
-
-expr2c("ProjectionRectilinear::mac_x_dc_view", args, diff(x_expand, c_view))$
-expr2c("ProjectionRectilinear::mac_x_dc_nick", args, diff(x_expand, c_nick))$
-expr2c("ProjectionRectilinear::mac_x_dc_tilt", args, diff(x_expand, c_tilt))$
-expr2c("ProjectionRectilinear::mac_x_dscale", args, diff(x_expand, scale))$
-expr2c("ProjectionRectilinear::mac_x_dk0", args, diff(x_expand, k0))$
-expr2c("ProjectionRectilinear::mac_x_dk1", args, diff(x_expand, k1))$
-expr2c("ProjectionRectilinear::mac_x_dx0", args, diff(x_expand, x0))$
-expr2c("ProjectionRectilinear::mac_y_dc_view", args, diff(y_expand, c_view))$
-expr2c("ProjectionRectilinear::mac_y_dc_nick", args, diff(y_expand, c_nick))$
-expr2c("ProjectionRectilinear::mac_y_dc_tilt", args, diff(y_expand, c_tilt))$
-expr2c("ProjectionRectilinear::mac_y_dscale", args, diff(y_expand, scale))$
-expr2c("ProjectionRectilinear::mac_y_dk0", args, diff(y_expand, k0))$
-expr2c("ProjectionRectilinear::mac_y_dk1", args, diff(y_expand, k1))$
-expr2c("ProjectionRectilinear::mac_y_dx0", args, diff(y_expand, x0))$
diff --git a/src/strsep.c b/src/strsep.c
deleted file mode 100644
index c8e4be0..0000000
--- a/src/strsep.c
+++ /dev/null
@@ -1,70 +0,0 @@
-/* Copyright (C) 1992, 93, 96, 97, 98, 99, 2004 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include "../config.h"
-
-#ifndef HAVE_STRSEP
-
-#include "string.h"
-
-char *
-strsep (char **stringp, const char *delim)
-{
-  char *begin, *end;
-
-  begin = *stringp;
-  if (begin == NULL)
-    return NULL;
-
-  /* A frequent case is when the delimiter string contains only one
-     character.  Here we don't need to call the expensive `strpbrk'
-     function and instead work using `strchr'.  */
-  if (delim[0] == '\0' || delim[1] == '\0')
-    {
-      char ch = delim[0];
-
-      if (ch == '\0')
-        end = NULL;
-      else
-        {
-          if (*begin == ch)
-            end = begin;
-          else if (*begin == '\0')
-            end = NULL;
-          else
-            end = strchr (begin + 1, ch);
-        }
-    }
-  else
-    /* Find the end of the token.  */
-    end = strpbrk (begin, delim);
-
-  if (end)
-    {
-      /* Terminate the token and set *STRINGP past NUL character.  */
-      *end++ = '\0';
-      *stringp = end;
-    }
-  else
-    /* No more delimiters; this is the last token.  */
-    *stringp = NULL;
-
-  return begin;
-}
-
-#endif
diff --git a/src/strsep.h b/src/strsep.h
deleted file mode 100644
index 28295ba..0000000
--- a/src/strsep.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* 
- * Copyright 2008 Johannes Hofmann <Johannes.Hofmann@gmx.de>
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- */
-
-#include "../config.h"
-
-#ifndef HAVE_STRSEP
-char * strsep (char **stringp, const char *delim);
-#endif
diff --git a/tests/gen_golden.sh b/tests/gen_golden.sh
new file mode 100755
index 0000000..c23ec28
--- /dev/null
+++ b/tests/gen_golden.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+# Generate golden reference data from the original C++ implementation.
+# Requires: the gipfel C++ sources built (objects in $SRC), g++, GSL, maxima.
+set -e
+cd "$(dirname "$0")"
+
+SRC=${GIPFEL_SRC:-$HOME/gipfel/src}
+DATA=${GIPFEL_DATA:-$HOME/gipfel/gipfel.dat}
+BUILD=harness/build
+mkdir -p $BUILD golden
+
+# rename class-scoped generated functions to free functions
+sed 's/ProjectionRectilinear::/rect_/g' $SRC/ProjectionRectilinear_funcs.cxx > $BUILD/rect_funcs.cxx
+sed 's/ProjectionCylindrical::/cyl_/g'  $SRC/ProjectionCylindrical_funcs.cxx > $BUILD/cyl_funcs.cxx
+
+g++ -O2 -o $BUILD/funcsdump harness/funcsdump.cxx -I$BUILD -lm
+$BUILD/funcsdump > golden/funcs.txt
+
+g++ -O2 -o $BUILD/fitdump harness/fitdump.cxx \
+	-I$SRC $SRC/Panorama.o $SRC/Hill.o $SRC/ProjectionLSQ.o \
+	$SRC/ProjectionRectilinear.o $SRC/ProjectionCylindrical.o \
+	-lm -lgsl -lgslcblas
+
+$BUILD/fitdump "$DATA" 0 > golden/fit_rect.txt
+$BUILD/fitdump "$DATA" 1 > golden/fit_cyl.txt
+
+g++ -O2 -o $BUILD/exportdump harness/exportdump.cxx \
+	-I$SRC $SRC/Panorama.o $SRC/Hill.o $SRC/ProjectionLSQ.o \
+	$SRC/ProjectionRectilinear.o $SRC/ProjectionCylindrical.o $SRC/ImageMetaData.o \
+	-lexiv2 -ltiff -lgsl -lgslcblas -lm
+
+$BUILD/exportdump golden/test.jpg "$DATA" 2>/dev/null > golden/export.txt
+
+g++ -O2 -o $BUILD/stitchdump harness/stitchdump.cxx \
+	-I$SRC $SRC/Panorama.o $SRC/Hill.o $SRC/ScanImage.o $SRC/ProjectionLSQ.o \
+	$SRC/ProjectionRectilinear.o $SRC/ProjectionCylindrical.o \
+	-lfltk -lgsl -lgslcblas -lm
+
+# stitch: cylindrical resample of one image (projtype center pitch roll scale
+# k0 k1 x0 out_w out_h from to bicubic)
+$BUILD/stitchdump golden/stitch.ppm 0 20 2 0 200 0 0 0 64 48 10 30 0 > golden/stitch_rect_near.txt
+$BUILD/stitchdump golden/stitch.ppm 0 20 2 0 200 0 0 0 64 48 10 30 1 > golden/stitch_rect_bic.txt
+$BUILD/stitchdump golden/stitch.ppm 1 20 2 0 200 0 0 0 64 48 10 30 1 > golden/stitch_cyl_bic.txt
+$BUILD/stitchdump golden/stitch.ppm 0 20 2 3 200 -0.3 0.1 0 64 48 10 30 1 > golden/stitch_dist_bic.txt
+
+echo "golden written:"
+wc -l golden/*.txt
diff --git a/tests/golden/export.txt b/tests/golden/export.txt
new file mode 100644
index 0000000..4928658
--- /dev/null
+++ b/tests/golden/export.txt
@@ -0,0 +1,17 @@
+#
+# name	height	x	y	distance	flags
+#
+AMIESBERG	1780	163	502	16561
+FELDERNKREUZ	2048	1466	450	19944
+SCHOTTELKARSPITZE	2049	1453	450	20154
+ZWIRCHKOPF	1773	1444	581	4118
+SCHOETTELKOPF	1907	1429	461	21275
+SEINSKOPF	1961	1406	458	19374
+OCHSENSTAFFEL	1871	1401	464	21971
+SIGNALKOPF	1895	1392	465	18879
+OBERE WETTERSTEINSPITZE	2297	879	415	8077
+SIMETSBERG	1840	770	475	24291
+ROTPLATTENSPITZE	2390	683	395	7420
+WETTERSTEINWAND	2482	524	373	7038
+WETTERSTEINKOPF	2433	408	384	6903
+OFELEKOPF	2478	223	336	4954
diff --git a/tests/golden/fit_cyl.txt b/tests/golden/fit_cyl.txt
new file mode 100644
index 0000000..cdde13c
--- /dev/null
+++ b/tests/golden/fit_cyl.txt
@@ -0,0 +1,14 @@
+ret 0
+a_center 6.6322511575784517
+a_nick 7.5149662500849354e-18
+a_tilt 0.017453292519943285
+scale 3000.0000000000009
+k0 0
+k1 0
+x0 0
+hill 0 -1136.4890178984479 91.333004952545252
+hill 1 -1404.1585409517218 -150.78485966743139
+hill 2 -1578.4832174937635 -134.52393246509686
+hill 3 -1747.4097596895024 100.5675701918971
+hill 4 -1817.5350955613387 -72.855082700985704
+hill 5 -2000.1065521517946 77.132392173389633
diff --git a/tests/golden/fit_rect.txt b/tests/golden/fit_rect.txt
new file mode 100644
index 0000000..d37b380
--- /dev/null
+++ b/tests/golden/fit_rect.txt
@@ -0,0 +1,14 @@
+ret 0
+a_center 6.6322511575784384
+a_nick 3.8358482613767501e-16
+a_tilt 0.01745329251994306
+scale 3000.0000000000027
+k0 1.1252597395717405e-14
+k1 1.6387771195849632e-15
+x0 -1.3533330861078106e-14
+hill 0 -1194.2901436402242 97.812455966247811
+hill 1 -1516.1807642651722 -169.86071632098324
+hill 2 -1741.859869105966 -156.929589386619
+hill 3 -1976.4828429431623 118.42826203922655
+hill 4 -2077.8688492890328 -90.908545475464734
+hill 5 -2361.0905544534971 94.952405220629913
diff --git a/tests/golden/funcs.txt b/tests/golden/funcs.txt
new file mode 100644
index 0000000..148f758
--- /dev/null
+++ b/tests/golden/funcs.txt
@@ -0,0 +1,200 @@
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diff --git a/tests/golden/stitch.ppm b/tests/golden/stitch.ppm
new file mode 100644
index 0000000..0f0a43e
--- /dev/null
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diff --git a/tests/golden/stitch_cyl_bic.txt b/tests/golden/stitch_cyl_bic.txt
new file mode 100644
index 0000000..05cbec1
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diff --git a/tests/golden/stitch_dist_bic.txt b/tests/golden/stitch_dist_bic.txt
new file mode 100644
index 0000000..619e8de
--- /dev/null
+++ b/tests/golden/stitch_dist_bic.txt
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diff --git a/tests/golden/stitch_rect_bic.txt b/tests/golden/stitch_rect_bic.txt
new file mode 100644
index 0000000..ca546ea
--- /dev/null
+++ b/tests/golden/stitch_rect_bic.txt
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diff --git a/tests/golden/stitch_rect_near.txt b/tests/golden/stitch_rect_near.txt
new file mode 100644
index 0000000..94e9465
--- /dev/null
+++ b/tests/golden/stitch_rect_near.txt
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diff --git a/tests/golden/test.jpg b/tests/golden/test.jpg
new file mode 100644
index 0000000..5ea9549
--- /dev/null
+++ b/tests/golden/test.jpg
diff --git a/tests/harness/build/cyl_funcs.cxx b/tests/harness/build/cyl_funcs.cxx
new file mode 100644
index 0000000..5143ba5
--- /dev/null
+++ b/tests/harness/build/cyl_funcs.cxx
@@ -0,0 +1,10 @@
+double cyl_mac_x ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 ; _1 = tan(c_nick) ; _2 = tan(m_nick) ; return (cos(c_tilt)*(m_view-c_view)-(sin(c_tilt)*(_2-_1))/(_1*_2+1))*scale ; } 
+double cyl_mac_y ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 ; _1 = tan(c_nick) ; _2 = tan(m_nick) ; return ((-sin(c_tilt)*(m_view-c_view))-(cos(c_tilt)*(_2-_1))/(_1*_2+1))*scale ; } 
+double cyl_mac_x_dc_view ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { return -cos(c_tilt)*scale ; } 
+double cyl_mac_x_dc_nick ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 ; _1 = pow(sec(c_nick),2) ; _2 = sin(c_tilt) ; _3 = tan(m_nick) ; _4 = tan(c_nick) ; _5 = _4*_3+1 ; return ((_1*_2*_3*(_3-_4))/pow(_5,2)+(_1*_2)/_5)*scale ; } 
+double cyl_mac_x_dc_tilt ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 ; _1 = tan(c_nick) ; _2 = tan(m_nick) ; return ((-sin(c_tilt)*(m_view-c_view))-(cos(c_tilt)*(_2-_1))/(_1*_2+1))*scale ; } 
+double cyl_mac_x_dscale ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 ; _1 = tan(c_nick) ; _2 = tan(m_nick) ; return cos(c_tilt)*(m_view-c_view)-(sin(c_tilt)*(_2-_1))/(_1*_2+1) ; } 
+double cyl_mac_y_dc_view ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { return sin(c_tilt)*scale ; } 
+double cyl_mac_y_dc_nick ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 ; _1 = pow(sec(c_nick),2) ; _2 = cos(c_tilt) ; _3 = tan(m_nick) ; _4 = tan(c_nick) ; _5 = _4*_3+1 ; return ((_1*_2*_3*(_3-_4))/pow(_5,2)+(_1*_2)/_5)*scale ; } 
+double cyl_mac_y_dc_tilt ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 ; _1 = tan(c_nick) ; _2 = tan(m_nick) ; return ((sin(c_tilt)*(_2-_1))/(_1*_2+1)-cos(c_tilt)*(m_view-c_view))*scale ; } 
+double cyl_mac_y_dscale ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 ; _1 = tan(c_nick) ; _2 = tan(m_nick) ; return (-sin(c_tilt)*(m_view-c_view))-(cos(c_tilt)*(_2-_1))/(_1*_2+1) ; } 
diff --git a/tests/harness/build/exportdump b/tests/harness/build/exportdump
new file mode 100755
index 0000000..e732af7
--- /dev/null
+++ b/tests/harness/build/exportdump
diff --git a/tests/harness/build/fitdump b/tests/harness/build/fitdump
new file mode 100755
index 0000000..37383c8
--- /dev/null
+++ b/tests/harness/build/fitdump
diff --git a/tests/harness/build/funcsdump b/tests/harness/build/funcsdump
new file mode 100755
index 0000000..37efb59
--- /dev/null
+++ b/tests/harness/build/funcsdump
diff --git a/tests/harness/build/rect_funcs.cxx b/tests/harness/build/rect_funcs.cxx
new file mode 100644
index 0000000..95c5cc2
--- /dev/null
+++ b/tests/harness/build/rect_funcs.cxx
@@ -0,0 +1,16 @@
+double rect_mac_x ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = pow(_15,2)+pow(_13*_11*_12-_1*_5*_14*_11,2) ; return scale*_15*(k0*sqrt(_16)+k1*_16+1) ; } 
+double rect_mac_y ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = pow(x0+_1*_5*_14*_11+_13*_11*_12,2)+pow(_15,2) ; return _15*scale*(k0*sqrt(_16)+k1*_16+1) ; } 
+double rect_mac_x_dc_view ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 , _18 , _19 , _20 , _21 , _22 , _23 , _24 , _25 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = cos(c_tilt) ; _15 = _6*_9-_8*_7 ; _16 = x0+_14*_5*_15*_12+_1*_12*_13 ; _17 = _14*_12*_13-_1*_5*_15*_12 ; _18 = 1/pow(_11,2) ; _19 = pow(_5,2) ; _20 = pow(_15,2) ; _21 = (-_8*_9)-_6*_7 ; _22 = _14*_5*_21*_12+_2*_1*_5*_15*_12-_4*_14*_19*_20*_18-_4*_1*_5*_15*_18*_13 ; _23 = 2*_22*_16+2*_17*((-_1*_5*_21*_12)+_2*_14*_5*_15*_12+_4*_1*_19*_20*_18-_4*_14*_5*_15*_18*_13) ; _24 = pow(_17,2)+pow(_16,2) ; _25 = sqrt(_24) ; return _22*scale*(k0*_25+k1*_24+1)+scale*_16*((k0*_23)/(2*_25)+k1*_23) ; } 
+double rect_mac_x_dc_nick ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 , _18 , _19 , _20 , _21 , _22 , _23 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = cos(c_tilt) ; _15 = _6*_9-_8*_7 ; _16 = x0+_14*_5*_15*_12+_1*_12*_13 ; _17 = 1/pow(_11,2) ; _18 = _4*_3-_2*_5*_10 ; _19 = _14*_12*_13-_1*_5*_15*_12 ; _20 = (-_1*_17*_18*_13)-_14*_5*_15*_17*_18+_1 ; _21 = 2*_20*_16+2*((-_14*_17*_18*_13)+_1*_5*_15*_17*_18+_14)*_19 ; _22 = pow(_19,2)+pow(_16,2) ; _23 = sqrt(_22) ; return _20*scale*(k0*_23+k1*_22+1)+scale*_16*((k0*_21)/(2*_23)+k1*_21) ; } 
+double rect_mac_x_dc_tilt ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 , _18 , _19 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = _13*_11*_12-_1*_5*_14*_11 ; _17 = 2*_16*_15+2*((-_13*_5*_14*_11)-_1*_11*_12)*_16 ; _18 = pow(_16,2)+pow(_15,2) ; _19 = sqrt(_18) ; return _16*scale*(k0*_19+k1*_18+1)+scale*_15*((k0*_17)/(2*_19)+k1*_17) ; } 
+double rect_mac_x_dscale ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = pow(_15,2)+pow(_13*_11*_12-_1*_5*_14*_11,2) ; return _15*(k0*sqrt(_16)+k1*_16+1) ; } 
+double rect_mac_x_dk0 ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; return _15*sqrt(pow(_15,2)+pow(_13*_11*_12-_1*_5*_14*_11,2))*scale ; } 
+double rect_mac_x_dk1 ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; return _15*(pow(_15,2)+pow(_13*_11*_12-_1*_5*_14*_11,2))*scale ; } 
+double rect_mac_x_dx0 ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 ; _1 = sin(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = cos(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = x0+_13*_5*_14*_11+_1*_11*_12 ; _16 = pow(_15,2)+pow(_13*_11*_12-_1*_5*_14*_11,2) ; _17 = sqrt(_16) ; return scale*(k0*_17+k1*_16+1)+scale*_15*((k0*_15)/_17+2*k1*_15) ; } 
+double rect_mac_y_dc_view ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 , _18 , _19 , _20 , _21 , _22 , _23 , _24 , _25 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = sin(c_tilt) ; _15 = _6*_9-_8*_7 ; _16 = _1*_12*_13-_14*_5*_15*_12 ; _17 = 1/pow(_11,2) ; _18 = pow(_5,2) ; _19 = pow(_15,2) ; _20 = (-_8*_9)-_6*_7 ; _21 = (-_14*_5*_20*_12)+_2*_1*_5*_15*_12+_4*_14*_18*_19*_17-_4*_1*_5*_15*_17*_13 ; _22 = x0+_1*_5*_15*_12+_14*_12*_13 ; _23 = 2*(_1*_5*_20*_12+_2*_14*_5*_15*_12-_4*_1*_18*_19*_17-_4*_14*_5*_15*_17*_13)*_22+2*_16*_21 ; _24 = pow(_22,2)+pow(_16,2) ; _25 = sqrt(_24) ; return _21*scale*(k0*_25+k1*_24+1)+_16*scale*((k0*_23)/(2*_25)+k1*_23) ; } 
+double rect_mac_y_dc_nick ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 , _18 , _19 , _20 , _21 , _22 , _23 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = _4*_5*_10+_2*_3 ; _12 = 1/_11 ; _13 = _2*_5*_10-_4*_3 ; _14 = sin(c_tilt) ; _15 = _6*_9-_8*_7 ; _16 = _1*_12*_13-_14*_5*_15*_12 ; _17 = 1/pow(_11,2) ; _18 = _4*_3-_2*_5*_10 ; _19 = (-_1*_17*_18*_13)+_14*_5*_15*_17*_18+_1 ; _20 = x0+_1*_5*_15*_12+_14*_12*_13 ; _21 = 2*((-_14*_17*_18*_13)-_1*_5*_15*_17*_18+_14)*_20+2*_19*_16 ; _22 = pow(_20,2)+pow(_16,2) ; _23 = sqrt(_22) ; return _19*scale*(k0*_23+k1*_22+1)+_16*scale*((k0*_21)/(2*_23)+k1*_21) ; } 
+double rect_mac_y_dc_tilt ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 , _17 , _18 , _19 , _20 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = (-_1*_5*_14*_11)-_13*_11*_12 ; _17 = x0+_1*_5*_14*_11+_13*_11*_12 ; _18 = 2*_15*_17+2*_16*_15 ; _19 = pow(_17,2)+pow(_15,2) ; _20 = sqrt(_19) ; return _16*scale*(k0*_20+k1*_19+1)+_15*scale*((k0*_18)/(2*_20)+k1*_18) ; } 
+double rect_mac_y_dscale ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = pow(x0+_1*_5*_14*_11+_13*_11*_12,2)+pow(_15,2) ; return _15*(k0*sqrt(_16)+k1*_16+1) ; } 
+double rect_mac_y_dk0 ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; return _15*scale*sqrt(pow(x0+_1*_5*_14*_11+_13*_11*_12,2)+pow(_15,2)) ; } 
+double rect_mac_y_dk1 ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; return _15*scale*(pow(x0+_1*_5*_14*_11+_13*_11*_12,2)+pow(_15,2)) ; } 
+double rect_mac_y_dx0 ( double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick ) { double _1 , _2 , _3 , _4 , _5 , _6 , _7 , _8 , _9 , _10 , _11 , _12 , _13 , _14 , _15 , _16 ; _1 = cos(c_tilt) ; _2 = sin(c_nick) ; _3 = sin(m_nick) ; _4 = cos(c_nick) ; _5 = cos(m_nick) ; _6 = cos(c_view) ; _7 = cos(m_view) ; _8 = sin(c_view) ; _9 = sin(m_view) ; _10 = _8*_9+_6*_7 ; _11 = 1/(_4*_5*_10+_2*_3) ; _12 = _2*_5*_10-_4*_3 ; _13 = sin(c_tilt) ; _14 = _6*_9-_8*_7 ; _15 = _1*_11*_12-_13*_5*_14*_11 ; _16 = x0+_1*_5*_14*_11+_13*_11*_12 ; return _15*((_16*k0)/sqrt(pow(_16,2)+pow(_15,2))+2*k1*_16)*scale ; } 
diff --git a/tests/harness/build/stitchdump b/tests/harness/build/stitchdump
new file mode 100755
index 0000000..e63a628
--- /dev/null
+++ b/tests/harness/build/stitchdump
diff --git a/tests/harness/exportdump.cxx b/tests/harness/exportdump.cxx
new file mode 100644
index 0000000..2c0e736
--- /dev/null
+++ b/tests/harness/exportdump.cxx
@@ -0,0 +1,77 @@
+// Golden dump: export-hills pipeline through the original C++ Panorama +
+// ImageMetaData (mirrors GipfelWidget::load_image + export_hills, no FLTK).
+// Usage: exportdump <img> <gipfel.dat>
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+#include <exiv2/exiv2.hpp>
+
+#include "Panorama.H"
+#include "Hill.H"
+#include "ImageMetaData.H"
+
+int main(int argc, char **argv) {
+	if (argc < 3) {
+		fprintf(stderr, "usage: exportdump <img> <gipfel.dat>\n");
+		return 1;
+	}
+
+	int w = 0, h = 0;
+	{
+		auto im = Exiv2::ImageFactory::open(argv[1]);
+		im->readMetadata();
+		w = im->pixelWidth();
+		h = im->pixelHeight();
+	}
+
+	ImageMetaData md;
+	md.load_image(argv[1]);
+
+	Panorama pan;
+	pan.set_view_long(md.longitude());
+	pan.set_view_lat(md.latitude());
+	pan.set_view_height(md.height());
+	pan.set_projection((ProjectionLSQ::Projection_t) md.projection_type());
+
+	int have = 1;
+	double v;
+	v = md.direction();
+	if (std::isnan(v)) { pan.set_center_angle(0.0); have = 0; } else pan.set_center_angle(v);
+	v = md.nick();
+	if (std::isnan(v)) { pan.set_nick_angle(0.0); have = 0; } else pan.set_nick_angle(v);
+	v = md.tilt();
+	if (std::isnan(v)) { pan.set_tilt_angle(0.0); have = 0; } else pan.set_tilt_angle(v);
+	v = md.focal_length_35mm();
+	if (std::isnan(v) || v == 0.0) { pan.set_scale(35.0 * (double)(w > h ? w : h) / 35.0); have = 0; }
+	else pan.set_scale(v * (double)(w > h ? w : h) / 35.0);
+
+	md.distortion_params(&pan.parms.k0, &pan.parms.k1, &pan.parms.x0);
+	if (std::isnan(pan.parms.k0)) pan.parms.k0 = 0.0;
+	if (std::isnan(pan.parms.k1)) pan.parms.k1 = 0.0;
+	if (std::isnan(pan.parms.x0)) pan.parms.x0 = 0.0;
+
+	if (pan.load_data(argv[2])) return 1;
+	pan.set_height_dist_ratio(0.07);
+
+	if (!have) {
+		fprintf(stderr, "No gipfel info available.\n");
+		return 0;
+	}
+
+	printf("#\n# name\theight\tx\ty\tdistance\tflags\n#\n");
+	Hills *mnts = pan.get_visible_mountains();
+	for (int i = 0; i < mnts->get_num(); i++) {
+		Hill *m = mnts->get(i);
+		int _x = (int) rint(m->x) + w / 2;
+		int _y = (int) rint(m->y) + h / 2;
+
+		if (m->flags & Hill::DUPLIC || m->flags & Hill::HIDDEN)
+			continue;
+		if (_x < 0 || _x > w || _y < 0 || _y > h)
+			continue;
+
+		printf("%s\t%d\t%d\t%d\t%d\n", m->name, (int) rint(m->height), _x, _y,
+			(int) rint(pan.get_real_distance(m)));
+	}
+	return 0;
+}
diff --git a/tests/harness/fitdump.cxx b/tests/harness/fitdump.cxx
new file mode 100644
index 0000000..8ef392c
--- /dev/null
+++ b/tests/harness/fitdump.cxx
@@ -0,0 +1,83 @@
+// Golden dump: full fit through the original C++ Panorama + GSL solver.
+// Usage: fitdump <gipfel.dat> <projection 0|1>
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+#include "Panorama.H"
+#include "Hill.H"
+#include "ProjectionRectilinear.H"
+#include "ProjectionCylindrical.H"
+
+int main(int argc, char **argv) {
+	if (argc < 3) {
+		fprintf(stderr, "usage: fitdump <gipfel.dat> <projection>\n");
+		return 1;
+	}
+
+	Panorama pan;
+	if (pan.load_data(argv[1])) {
+		fprintf(stderr, "load failed\n");
+		return 1;
+	}
+	pan.set_projection((ProjectionLSQ::Projection_t) atoi(argv[2]));
+
+	pan.set_view_lat(47.36);
+	pan.set_view_long(11.15);
+	pan.set_view_height(2100.0);
+
+	// ground truth
+	pan.set_center_angle(20.0);
+	pan.set_nick_angle(0.0);
+	pan.set_tilt_angle(1.0);
+	pan.set_scale(3000.0);
+
+	// observed positions = projection of first 6 visible hills (snapshotted
+	// as copies so the perturbation below does not overwrite them)
+	Hills *vis = pan.get_visible_mountains();
+	Hills known;
+	int n = vis->get_num() < 6 ? vis->get_num() : 6;
+	for (int i = 0; i < n; i++) {
+		Hill *c = new Hill(*vis->get(i));
+		// NOTE: Hill's copy ctor in the original does not copy a_nick
+		// (uninitialized garbage -> LSQR stagnates). The real app always
+		// fits hills living in the main list where a_nick is set, so set it
+		// here to reproduce the real-app behavior.
+		c->a_nick = vis->get(i)->a_nick;
+		known.add(c);
+	}
+
+	// perturb the initial guess
+	pan.set_center_angle(pan.get_center_angle() + 0.5);
+	pan.set_nick_angle(0.3);
+	pan.set_tilt_angle(0.5);
+	pan.set_scale(2800.0);
+
+	int ret = pan.comp_params(&known);
+
+	ViewParams *p = &pan.parms;
+	printf("ret %d\n", ret);
+	printf("a_center %.17g\n", p->a_center);
+	printf("a_nick %.17g\n", p->a_nick);
+	printf("a_tilt %.17g\n", p->a_tilt);
+	printf("scale %.17g\n", p->scale);
+	printf("k0 %.17g\n", p->k0);
+	printf("k1 %.17g\n", p->k1);
+	printf("x0 %.17g\n", p->x0);
+
+	// final image coordinates of the known hills (bypass visibility check)
+	for (int i = 0; i < known.get_num(); i++) {
+		Hill *m = known.get(i);
+		double x = NAN, y = NAN;
+		if (atoi(argv[2]) == 1) {
+			ProjectionCylindrical pc;
+			pc.get_coordinates(m->alph, m->a_nick, &pan.parms, &x, &y);
+		} else {
+			ProjectionRectilinear pr;
+			pr.get_coordinates(m->alph, m->a_nick, &pan.parms, &x, &y);
+		}
+		printf("hill %d %.17g %.17g\n", i, x, y);
+	}
+
+	return 0;
+}
diff --git a/tests/harness/funcsdump.cxx b/tests/harness/funcsdump.cxx
new file mode 100644
index 0000000..b416f2c
--- /dev/null
+++ b/tests/harness/funcsdump.cxx
@@ -0,0 +1,60 @@
+// Golden dump of the maxima-generated projection functions (C reference).
+// The `#define` trick turns the generated class methods into free functions.
+#include <stdio.h>
+#include <math.h>
+
+static double sec(double a) { return 1.0 / cos(a); }
+
+// gen_golden.sh copies the generated files with the class scope replaced:
+// ProjectionRectilinear::rect_mac_x -> rect_mac_x, ProjectionCylindrical::rect_mac_x -> cyl_mac_x
+#include "rect_funcs.cxx"
+#include "cyl_funcs.cxx"
+
+int main(void) {
+	for (int k = 0; k < 200; k++) {
+		double kk = (double) k;
+		double c_view = -3.0 + 0.03 * kk;
+		double c_nick = 0.10 * sin(0.11 * kk);
+		double c_tilt = 0.05 * cos(0.07 * kk);
+		double scale = 2000.0 + 37.0 * fmod(kk, 19.0);
+		double k0 = 0.001 * sin(0.31 * kk);
+		double k1 = 0.0001 * cos(0.17 * kk);
+		double x0 = 50.0 * sin(0.13 * kk);
+		double m_view = c_view + 0.5 * sin(0.23 * kk);
+		double m_nick = 0.05 * cos(0.19 * kk);
+
+		printf("%.17g %.17g %.17g %.17g %.17g %.17g %.17g %.17g %.17g ",
+			rect_mac_x(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dc_view(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dc_nick(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dc_tilt(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dscale(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dk0(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dk1(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_x_dx0(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick));
+		printf("%.17g %.17g %.17g %.17g %.17g %.17g %.17g ",
+			rect_mac_y_dc_view(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y_dc_nick(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y_dc_tilt(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y_dscale(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y_dk0(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y_dk1(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			rect_mac_y_dx0(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick));
+
+		printf("%.17g %.17g ",
+			cyl_mac_x(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_y(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick));
+		printf("%.17g %.17g %.17g %.17g ",
+			cyl_mac_x_dc_view(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_x_dc_nick(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_x_dc_tilt(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_x_dscale(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick));
+		printf("%.17g %.17g %.17g %.17g\n",
+			cyl_mac_y_dc_view(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_y_dc_nick(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_y_dc_tilt(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick),
+			cyl_mac_y_dscale(c_view, c_nick, c_tilt, scale, k0, k1, x0, m_view, m_nick));
+	}
+	return 0;
+}
diff --git a/tests/harness/stitchdump.cxx b/tests/harness/stitchdump.cxx
new file mode 100644
index 0000000..cd015e7
--- /dev/null
+++ b/tests/harness/stitchdump.cxx
@@ -0,0 +1,102 @@
+// Golden dump: Stitch::resample pipeline through the original C++ Panorama +
+// ScanImage (no FLTK GUI; PPM input wrapped in Fl_RGB_Image).
+// Usage: stitchdump <img.ppm> <projtype> <center> <pitch> <roll> <scale>
+//                    <k0> <k1> <x0> <w> <h> <from> <to> <bicubic>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <ctype.h>
+#include <algorithm>
+
+#include <FL/Fl.H>
+#include <FL/Fl_RGB_Image.H>
+
+#include "Panorama.H"
+#include "ScanImage.H"
+
+#define MAX_VALUE 65025
+
+// minimal P6 PPM reader
+static unsigned char *read_ppm(const char *path, int *w, int *h) {
+    FILE *f = fopen(path, "rb");
+    if (!f) return NULL;
+    int c;
+    if (fgetc(f) != 'P' || fgetc(f) != '6' || (c = fgetc(f), !isspace(c))) {
+        fclose(f); return NULL;
+    }
+    int skip = 0;
+    while (!skip) {
+        c = fgetc(f);
+        if (c == '#') { while ((c = fgetc(f)) != '\n' && c != EOF); continue; }
+        if (c == ' ' || c == '\n' || c == '\t' || c == '\r') continue;
+        skip = 1;
+        ungetc(c, f);
+    }
+    (void)c;
+    if (fscanf(f, "%d %d %*d", w, h) != 2) { fclose(f); return NULL; }
+    fgetc(f); // single whitespace
+    unsigned char *buf = (unsigned char*)malloc((size_t)(*w) * (*h) * 3);
+    if (fread(buf, 1, (size_t)(*w) * (*h) * 3, f) != (size_t)(*w) * (*h) * 3) {
+        free(buf); fclose(f); return NULL;
+    }
+    fclose(f);
+    return buf;
+}
+
+int main(int argc, char **argv) {
+    if (argc < 15) {
+        fprintf(stderr, "usage: stitchdump <img.ppm> <projtype> <center> <pitch> "
+                "<roll> <scale> <k0> <k1> <x0> <w> <h> <from> <to> <bicubic>\n");
+        return 1;
+    }
+    int iw = 0, ih = 0;
+    unsigned char *px = read_ppm(argv[1], &iw, &ih);
+    if (!px) { fprintf(stderr, "cannot read %s\n", argv[1]); return 1; }
+
+    Fl_RGB_Image img(px, iw, ih, 3);
+
+    Panorama pan;
+    pan.set_projection((ProjectionLSQ::Projection_t) atoi(argv[2]));
+    pan.set_center_angle(atof(argv[3]));
+    pan.set_nick_angle(atof(argv[4]));
+    pan.set_tilt_angle(atof(argv[5]));
+    pan.set_scale(atof(argv[6]));
+    pan.parms.k0 = atof(argv[7]);
+    pan.parms.k1 = atof(argv[8]);
+    pan.parms.x0 = atof(argv[9]);
+
+    int w = atoi(argv[10]), h = atoi(argv[11]);
+    double view_start = atof(argv[12]) * M_PI / 180.0;
+    double view_end = atof(argv[13]) * M_PI / 180.0;
+    ScanImage::mode_t mode = atoi(argv[14]) ? ScanImage::BICUBIC : ScanImage::NEAREST;
+
+    double step_view = (view_end - view_start) / w;
+    int y_off = h / 2;
+    double radius = (double) w / (view_end - view_start);
+
+    for (int y = 0; y < h; y++) {
+        double a_nick = atan((double)(y_off - y) / radius);
+        for (int x = 0; x < w; x++) {
+            double a_view = view_start + x * step_view;
+            int hit = 0, r = 0, g = 0, b = 0;
+            double px2, py2;
+            if (pan.get_coordinates(a_view, a_nick, &px2, &py2) == 0) {
+                int rr, gg, bb;
+                if (ScanImage::get_pixel(&img, mode,
+                        px2 + ((double) img.w()) / 2.0,
+                        py2 + ((double) img.h()) / 2.0,
+                        &rr, &gg, &bb) == 0) {
+                    hit = 1;
+                    r = std::max(std::min(rr, MAX_VALUE), 0);
+                    g = std::max(std::min(gg, MAX_VALUE), 0);
+                    b = std::max(std::min(bb, MAX_VALUE), 0);
+                }
+            }
+            printf("%d %d %d %d %d %d\n", x, y, hit, r, g, b);
+        }
+    }
+
+    free(px);
+    return 0;
+}
author	Johannes Hofmann <Johannes.Hofmann@gmx.de>	2026-10-26 20:05:20 +0100
committer	Johannes Hofmann <Johannes.Hofmann@gmx.de>	2026-10-26 20:05:20 +0100
commit	375d87a9b0ec1cf2fffd705adb870c86144d2400 (patch)
tree	1e8e05e7cd58686628d0f4622622456613a42e4d
parent	45425dd047b791fe63f13a46a3251c529cfffc94 (diff)