/*
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  RawTherapee 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _MYCURVE_
#define _MYCURVE_

#include <gtkmm.h>
#include <vector>

class CurveListener {

    public:
        virtual void curveChanged () {}
};

enum CurveType {Linear, Spline};

class CurveDescr {

    public:
        CurveType type;
        std::vector<double> x, y;
};

class MyCurve : public Gtk::DrawingArea {

        CurveListener* listener;
        CurveDescr curve;
        Gdk::CursorType cursor_type;
        Glib::RefPtr<Gdk::Pixmap> pixmap;
        int height;                 
        int grab_point;              
        int last;
        std::vector<Gdk::Point> point;
        
    protected:
        void draw (int width, int height);
        void interpolate (int width, int height);
        std::vector<double> get_vector (int veclen);
        double spline_eval (int n, double x[], double y[], double y2[], double val);
        void spline_solve (int n, double x[], double y[], double y2[]);

    public:
        MyCurve ();
        
        void setCurveListener (CurveListener* cl) { listener = cl; }
        std::vector<double> getPoints ();
        void setPoints (const std::vector<double>& p);
        void setType (CurveType t);
        bool handleEvents (GdkEvent* event);
        void notifyListener ();
};

#endif