1 files changed, 72 insertions, 8 deletions

diff --git a/src/CurveEditor.cxx b/src/CurveEditor.cxx
index 699261d..ad73758 100644
--- a/src/CurveEditor.cxx
+++ b/src/CurveEditor.cxx
@@ -6,6 +6,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 
 #include <FL/Fl.H>
 #include <FL/fl_draw.H>
@@ -15,18 +16,17 @@
 CurveEditor::CurveEditor(int my_x, int my_y, int my_w, int my_h) :
 	Fl_Widget(my_x, my_y, my_w, my_h) {
 
-	n = 3;
+	marked_point = -1;
+
+	n = 5;
 	X = (double*) calloc(n, sizeof(double));
 	Y = (double*) calloc(n, sizeof(double));
 
-	X[0] = 0.0;
-	Y[0] = 0.0;
-
-	X[1] = 0.2;
-	Y[1] = 0.4;
 
-	X[2] = 0.8;
-	Y[2] = 0.6;
+	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);
@@ -48,6 +48,70 @@ CurveEditor::draw() {
 	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();
+}