text: // 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.
  //
  // $URL$
  // $Id$
  // SPDX-License-Identifier: GPL-3.0+
  // 
  //
  // 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/license/GraphicsView.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
  