text: // Copyright (c) 2008  GeometryFactory Sarl (France).
  // All rights reserved.
  //
  // This file is part of CGAL (www.cgal.org).
  //
  // $URL: https://github.com/CGAL/cgal/blob/releases/CGAL-5.0.2/GraphicsView/demo/L1_Voronoi_diagram_2/include/CGAL/Qt/ArrangementGraphicsItem.h $
  // $Id: ArrangementGraphicsItem.h 254d60f 2019-10-19T15:23:19+02:00 Sébastien Loriot
  // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
  //
  // Author(s)     : Ophir Setter <ophirset@post.tau.ac.il>
  //                 
  
  #ifndef CGAL_QT_ARRANGEMENT_GRAPHICS_ITEM_H
  #define CGAL_QT_ARRANGEMENT_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>
  
  class QGraphicsSceneMouseEvent;
  
  
  namespace CGAL {
  namespace Qt {
  
  template <typename Arr>
  class ArrangementGraphicsItem : public GraphicsItem
  {
  public:
    ArrangementGraphicsItem(const Arr *arr);
    
    void setArrangement(const Arr *arr);
  
    QRectF 
    boundingRect() const;
    
    void 
    paint(QPainter *painter, 
          const QStyleOptionGraphicsItem *option, 
          QWidget *widget);
    
    void 
    modelChanged();
  
    const QPen& edgesPen() const
    {
      return m_edges_pen;
    }
  
    const QPen& verticesPen() const
    {
      return m_vertices_pen;
    }
  
    void setEdgesPen(const QPen& pen)
    {
      m_edges_pen = pen;
    }
  
    void setVerticesPen(const QPen& pen)
    {
      m_vertices_pen = pen;
    }
  
  private:
    const Arr *m_arr;
    QPen m_edges_pen;
    QPen m_vertices_pen;
  };
  
  template <typename Arr>
  ArrangementGraphicsItem<Arr>::ArrangementGraphicsItem(const Arr *arr)
    : m_arr(arr)
  {
    setZValue(3);
  }
  
  template <typename Arr>
  void ArrangementGraphicsItem<Arr>::setArrangement(const Arr *arr) {
    m_arr = arr;
  }
  
  
  template <typename Arr>
  QRectF 
  ArrangementGraphicsItem<Arr>::boundingRect() const
  {
    QRectF rect = CGAL::Qt::viewportsBbox(scene());
    return rect;
  }
  
  template <typename Arr>
  void 
  ArrangementGraphicsItem<Arr>::paint(QPainter *painter,
                                      const QStyleOptionGraphicsItem *option,
                                      QWidget* )
  {
    if (m_arr == NULL)
      return;
  
    QRectF rect = option->exposedRect;
    PainterOstream<typename Arr::Geometry_traits_2> pos(painter, rect);
    
    painter->setPen(edgesPen());
    for(typename Arr::Edge_const_iterator eit = m_arr->edges_begin();
        eit != m_arr->edges_end(); eit++) {
      pos << eit->curve();
    }
  
    painter->setPen(verticesPen());
    for(typename Arr::Vertex_const_iterator vit = m_arr->vertices_begin();
        vit != m_arr->vertices_end(); vit++) {
      pos << vit->point();
    }
  }
  
  
  template <typename T>
  void 
  ArrangementGraphicsItem<T>::modelChanged()
  {
    update();
  }
  
  } // namespace Qt
  } // namespace CGAL
  
  #endif // CGAL_QT_ARRANGEMENT_GRAPHICS_ITEM_H
  