From 9002a841a37a4dc4acd1c55e56a5e778156a5622 Mon Sep 17 00:00:00 2001
From: Johannes Hofmann <johannes.hofmann@gmx.de>
Date: Wed, 13 Apr 2005 16:07:16 +0000
Subject: initial version

initial version
---
 src/Panorama.cxx | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 src/Panorama.cxx

(limited to 'src/Panorama.cxx')

diff --git a/src/Panorama.cxx b/src/Panorama.cxx
new file mode 100644
index 0000000..6a25ac4
--- /dev/null
+++ b/src/Panorama.cxx
@@ -0,0 +1,147 @@
+// 
+// "$Id: Panorama.cxx,v 1.1 2005/04/13 18:07:16 hofmann Exp $"
+//
+// PSEditWidget routines.
+//
+// Copyright 2004 by Johannes Hofmann
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU Library General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+// USA.
+//
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include "Panorama.H"
+
+Panorama::Panorama() {
+  mountains = NULL;
+  visible_mountains = NULL;
+  height_dist_ratio = 0.1;
+  pi = asin(1.0) * 2.0;
+  deg2rad = pi / 180.0;
+}
+
+Panorama::~Panorama() {
+  if (mountains) {
+    delete(mountains);
+  }
+}
+
+int
+Panorama::load_file(const char *name) {
+  FILE *fp;
+  char buf[4000];
+  char *vals[10];
+  char **ap, *bp;
+  double phi, lam, height;
+  Mountain *m;
+
+  fp = fopen(name, "r");
+  if (!fp) {
+    perror("fopen");
+    return 1;
+  }
+  
+  while (fgets(buf, sizeof(buf), fp)) {
+    bp = buf;
+    for (ap = vals; (*ap = strsep(&bp, ",")) != NULL;)
+      if (++ap >= &vals[10])
+	break;
+
+    phi = atof(vals[3]) * deg2rad;
+    lam = atof(vals[4]) * deg2rad;
+    
+    height = atof(vals[5]);
+
+    m = new Mountain(vals[1], phi, lam, height);
+    if (mountains) {
+      mountains->append(m);
+    } else {
+      mountains = m;
+    }
+  }
+
+  fclose(fp);
+
+  check_visibility();
+  return 0;
+}
+
+int
+Panorama::set_viewpoint(const char *name) {
+  if (get_pos(name, &view_phi, &view_lam) != 1) {
+    fprintf(stderr, "Could not find exactly one entry for %s.\n");
+    return 1;
+  }
+
+  check_visibility();
+  return 0;
+}
+
+int
+Panorama::get_pos(const char *name, double *phi, double *lam) {
+  Mountain *m = mountains;
+  int found = 0;
+  double p, l;
+
+  while (m) {
+    if (strstr(m->name, name)) {
+      p = m->phi;
+      l = m->lam;
+
+      fprintf(stderr, "Found matching entry: %s (%fm)\n", m->name, m->height);
+      found++;
+    }
+    
+    m = m->get_next();
+  }
+
+  if (found == 1) {
+    *phi = p;
+    *lam = l;
+  }
+
+  return found;
+}
+
+void 
+Panorama::check_visibility() {
+  Mountain *m = mountains;
+  visible_mountains = NULL;
+
+  while (m) {
+
+    if (m->height / (distance(m->phi, m->lam)* 6368000) 
+	> height_dist_ratio) {
+      
+      if (visible_mountains) {
+	visible_mountains->append_visible(m);
+      } else {
+	visible_mountains = m;
+      }
+    }
+
+    m = m->get_next();
+  }
+}
+
+double 
+Panorama::distance(double phi, double lam) {
+  return acos(sin(view_phi) * sin(phi) + 
+	      cos(view_phi) * cos(phi) * cos(view_lam - lam));
+}
-- 
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