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// Copyright (c) 2008  GeometryFactory Sarl (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// 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.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// 
//
// Author(s)     : Andreas Fabri <Andreas.Fabri@geometryfactory.com>
//                 Laurent Rineau <Laurent.Rineau@geometryfactory.com>

#ifndef CGAL_QT_POWERDIAGRAM_GRAPHICS_ITEM_H
#define CGAL_QT_POWERDIAGRAM_GRAPHICS_ITEM_H



#include <CGAL/Qt/GraphicsItem.h>
#include <CGAL/Qt/PainterOstream.h>
#include <CGAL/Qt/utility.h>

#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QStyleOption>

#include <CGAL/intersection_2.h>

class QGraphicsSceneMouseEvent;


namespace CGAL {
namespace Qt {

template <typename RT>
class PowerdiagramGraphicsItem : public GraphicsItem
{

  typedef typename RT::Geom_traits Geom_traits;      
  typedef typename Kernel_traits<typename RT::Bare_point>::Kernel K;
  typedef typename K::Segment_2 Segment_2;
  typedef typename K::Line_2 Line_2;
  typedef typename K::Ray_2 Ray_2;

public:
  PowerdiagramGraphicsItem(RT  * rt_);


  QRectF 
  boundingRect() const;
  
  void 
  paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
  
  void 
  modelChanged();

  const QPen& edgesPen() const
  {
    return edges_pen;
  }

  void setEdgesPen(const QPen& pen)
  {
    edges_pen = pen;
  }

private:
  RT * rt;
  QPen edges_pen;
};



template <typename RT>
PowerdiagramGraphicsItem<RT>::PowerdiagramGraphicsItem(RT * rt_)
  :  rt(rt_)
{
  setZValue(3);
}

template <typename RT>
QRectF 
PowerdiagramGraphicsItem<RT>::boundingRect() const
{
  QRectF rect = CGAL::Qt::viewportsBbox(scene());

  return rect;
}
 

template <typename RT>
void 
PowerdiagramGraphicsItem<RT>::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget * /*w*/)
{
  QRectF rect = option->exposedRect;
  PainterOstream<K> pos(painter, rect);
  
  painter->setPen(edgesPen());
  for(typename RT::Finite_edges_iterator eit = rt->finite_edges_begin();
      eit != rt->finite_edges_end();
      eit++){
    CGAL::Object o = rt->dual(eit);
    Segment_2 s;
    Ray_2 r;
    Line_2 l;
    if(CGAL::assign(s,o)){
      pos << s;
    } else if(CGAL::assign(r,o)) {
      pos << r;
    }else if(CGAL::assign(l,o)) {
      pos << l;
    } 
  }
}


template <typename T>
void 
PowerdiagramGraphicsItem<T>::modelChanged()
{
  update();
}

} // namespace Qt
} // namespace CGAL

#endif // CGAL_QT_POWERDIAGRAM_GRAPHICS_ITEM_H