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//
// 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 <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include "CurveEditor.H"
CurveEditor::CurveEditor(int my_x, int my_y, int my_w, int my_h) :
Fl_Widget(my_x, my_y, my_w, my_h) {
marked_point = -1;
n = 5;
X = (double*) calloc(n, sizeof(double));
Y = (double*) calloc(n, sizeof(double));
for (int i = 0; i < n; i++) {
X[i] = (double) i / (n - 1);
Y[i] = (double) i / (n - 1);
}
acc = gsl_interp_accel_alloc ();
spline = gsl_spline_alloc (gsl_interp_cspline, n);
gsl_spline_init (spline, X, Y, n);
}
void
CurveEditor::draw() {
fl_color(FL_BLACK);
fl_rectf(x(), y(), w(), h());
fl_color(FL_WHITE);
fl_begin_line();
for (double _x = 0.0; _x < 1.0; _x = _x + 0.01) {
double _y = gsl_spline_eval(spline, _x, acc);
fl_vertex(x() + _x * w(), y() + h() * _y);
}
fl_end_line();
for (int i = 0; i < n; i++) {
if (i == marked_point) {
fl_color(FL_RED);
} else {
fl_color(FL_WHITE);
}
fl_rect(x() + w() * X[i] - 2, y() + h() * Y[i] - 2, 4, 4);
}
}
int
CurveEditor::handle(int event) {
int mark_x = Fl::event_x() - x();
int mark_y = Fl::event_y() - y();
switch(event) {
case FL_PUSH:
if (Fl::event_button() == 1) {
for (int i = 0; i < n; i++) {
int x_i = (int) rint(X[i] * w());
int y_i = (int) rint(Y[i] * h());
if (mark_x >= x_i - 2 && mark_x <= x_i + 2 &&
mark_y >= y_i - 2 && mark_y <= y_i + 2) {
marked_point = i;
redraw();
break;
}
}
}
Fl::focus(this);
return 1;
break;
case FL_DRAG:
set(marked_point, (double) mark_x / w(), (double) mark_y / h());
return 1;
break;
case FL_RELEASE:
marked_point = -1;
return 1;
break;
case FL_FOCUS:
return 1;
break;
case FL_UNFOCUS:
return 0;
break;
}
return 0;
}
void
CurveEditor::set(int i, double _x, double _y) {
if (i >= n ||
(_x < 0.0 || _x > 1.0 || _y < 0.0 || _y > 1.0) ||
(i < n - 1 && _x >= X[i + 1]) ||
(i > 0 && _x <= X[i - 1])) {
return;
}
X[i] = _x;
Y[i] = _y;
gsl_spline_init (spline, X, Y, n);
redraw();
}
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