//
// 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 <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);
	}
}