/*
 * Author: Harry van Haaren 2013
 *         harryhaaren@gmail.com
 * 
 * This program 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 2 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 * 
 */


#ifndef AVTK_RADIAL_STATUS_H
#define AVTK_RADIAL_STATUS_H

#include <FL/Fl_Slider.H>

namespace Avtk
{

class RadialStatus : public Fl_Slider
{
  public:
    RadialStatus(int _x, int _y, int _w, int _h, const char *_label = 0):
        Fl_Slider(_x, _y, _w, _h, _label)
    {
      x = _x;
      y = _y;
      w = _w;
      h = _h;
      
      label = _label;
      
      _r = 1.0;
      _g = 0.48;
      _b = 0.0;
      
      _bgr = 0.11;
      _bgg = 0.11;
      _bgb = 0.11;
      
      highlight = false;
      mouseOver = false;
    }
    
    bool mouseOver;
    bool highlight;
    int x, y, w, h;
    const char* label;
    
    float _r, _g, _b;       // foreground colour
    float _bgr, _bgg, _bgb; // background colour
    float _outr, _outg, _outb; // outline colour
    
    void setColor(float r, float g, float b)
    {
      _r = r;
      _g = g;
      _b = b;
    }
    
    void setBgColor(float r, float g, float b)
    {
      _bgr = r;
      _bgg = g;
      _bgb = b;
    }
    
    void draw()
    {
      if (damage() & FL_DAMAGE_ALL)
      {
        cairo_t *cr = Fl::cairo_cc();
        
        cairo_save( cr );
        
        int xc = (w) / 2.f;
        int yc = (h) / 2.f;
        
        float angle = value();
        
        /*
        // draw background quadrants
        int nbeats = 4;
        for(int i = 0; i < nbeats; i ++ )
        {
          cairo_set_source_rgba(cr, 0.0, 0.0, 1.f, 1);
          float start = (i-1) * (3.1415*2)/nbeats;
        }
        */
        
        if ( angle > 0.001 )
        {
          cairo_set_line_cap ( cr, CAIRO_LINE_CAP_ROUND );
          //cairo_move_to( cr, x + xc, y + yc );
          cairo_arc( cr, x + xc, y + yc, xc - 10, -(3.1415/2), angle * 6.28 - (3.1415/2) );
          cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8 );
          cairo_set_line_width(cr, 13.2);
          cairo_stroke_preserve(cr);
          
          cairo_set_source_rgba (cr, 1.0, 0.48, 0.0, 1 );
          cairo_set_line_width(cr, 8.2);
          cairo_stroke(cr);
        }
        
        // inside circle
        cairo_set_source_rgba(cr,0.3,0.3,0.3, 1);
        cairo_arc(cr, x + xc, y + yc, 10, 0, 2 * 3.1415);
        cairo_set_line_width(cr, 4.2);
        cairo_fill(cr);
        
        /*
        cairo_move_to (cr,x + xc, y + yc);
        cairo_set_source_rgba (cr, 1.0, 0.48, 0.0, 1);
        cairo_rotate ( cr, angle * 6.28 );
        cairo_rel_line_to ( cr,0, - (yc - 11) );
        cairo_stroke(cr);
        */
        
        cairo_restore( cr );
        
        draw_label();
      }
    }
    
    void resize(int X, int Y, int W, int H)
    {
      Fl_Widget::resize(X,Y,W,H);
      x = X;
      y = Y;
      w = W;
      h = H;
      redraw();
    }
    
    int handle(int event)
    {
      switch(event) {
        case FL_PUSH:
          highlight = 1;
          redraw();
          return 1;
        case FL_DRAG: {
            int t = Fl::event_inside(this);
            if (t != highlight) {
              highlight = t;
              redraw();
            }
          }
          return 1;
        case FL_ENTER:
          mouseOver = true;
          redraw();
          return 1;
        case FL_LEAVE:
          mouseOver = false;
          redraw();
          return 1;
        case FL_RELEASE:
          if (highlight) {
            highlight = 0;
            redraw();
            do_callback();
          }
          return 1;
        case FL_SHORTCUT:
          if ( test_shortcut() )
          {
            do_callback();
            return 1;
          }
          return 0;
        default:
          return Fl_Widget::handle(event);
      }
    }
};

} // Avtk

#endif // AVTK_RADIAL_STATUS_H