draw a spline

3 files changed, 45 insertions, 4 deletions

diff --git a/src/CurveEditor.H b/src/CurveEditor.H
index 4e58e6e..e774310 100644
--- a/src/CurveEditor.H
+++ b/src/CurveEditor.H
@@ -8,13 +8,19 @@
 #define CurveEditor_H
 
 #include <FL/Fl_Widget.H>
+#include <gsl/gsl_spline.h>
 
 class CurveEditor : public Fl_Widget {
 	private:
+		double *X;
+		double *Y;
+		int n;
+		gsl_interp_accel *acc;
+		gsl_spline *spline;
 
 	public:
 		CurveEditor(int _x, int _y, int _w, int _h);
-
+		void draw();
 };
 
 #endif
diff --git a/src/CurveEditor.cxx b/src/CurveEditor.cxx
index edc3a46..699261d 100644
--- a/src/CurveEditor.cxx
+++ b/src/CurveEditor.cxx
@@ -5,15 +5,49 @@
 // of the GNU General Public License, incorporated herein by reference.
 
 #include <stdio.h>
-#include <string.h>
+#include <stdlib.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) {
 
+	n = 3;
+	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;
+
+	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++) {
+		fl_rect(x() + w() * X[i] - 2, y() + h() * Y[i] - 2, 4, 4);
+	}
+}
diff --git a/src/flcurve.cxx b/src/flcurve.cxx
index ca0f8ff..ce8de6a 100644
--- a/src/flcurve.cxx
+++ b/src/flcurve.cxx
@@ -15,6 +15,7 @@
 
 #include <../config.h>
 
+#include "CurveEditor.H"
 
 void
 usage() {
@@ -46,9 +47,9 @@ main(int argc, char **argv) {
 	}
 
 	Fl_Window window(800, 600);
+	CurveEditor ce(10, 10, 780, 580);
 	window.end();
 
-
 	window.show(1, argv);
 
 	return Fl::run();