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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_CONSTRAINED_TRIANGULATION_GRAPHICS_ITEM_H
#define CGAL_QT_CONSTRAINED_TRIANGULATION_GRAPHICS_ITEM_H

#include <CGAL/Qt/TriangulationGraphicsItem.h>
#include <QPen>

namespace CGAL {

namespace Qt {

template <typename T>
class ConstrainedTriangulationGraphicsItem : public TriangulationGraphicsItem<T>
{
  typedef typename T::Geom_traits Geom_traits;
public:
  ConstrainedTriangulationGraphicsItem(T  * t_)
    : TriangulationGraphicsItem<T>(t_), visible_constraints(true)
  {
    constraints_pen = this->edgesPen();
    constraints_pen.setColor(::Qt::red);
  }
  
  void operator()(typename T::Face_handle fh);

  const QPen& constraintsPen() const
  {
    return constraints_pen;
  }

  void setConstraintsPen(const QPen& pen)
  {
    constraints_pen = pen;
  }

  bool visibleConstraints() const
  {
    return visible_constraints;
  }

  void setVisibleConstraints(const bool b)
  {
    visible_constraints = b;
    this->update();
  }

protected:
  void drawAll(QPainter *painter);

  QPen constraints_pen;

private:
  bool visible_constraints;

};

template <typename T>
void 
ConstrainedTriangulationGraphicsItem<T>::drawAll(QPainter *painter)
{
  this->painterostream = PainterOstream<Geom_traits>(painter);
  for(typename T::Finite_edges_iterator eit = this->t->finite_edges_begin();
      eit != this->t->finite_edges_end();
      ++eit){
    if(this->visibleConstraints() && this->t->is_constrained(*eit)){
      painter->setPen(constraintsPen());
      this->painterostream << this->t->segment(*eit);
    } else if( this->visibleEdges() ){
      painter->setPen(this->edgesPen());
      this->painterostream << this->t->segment(*eit);
    }
  }
  
  this->paintVertices(painter);
}

template <typename T>
void 
ConstrainedTriangulationGraphicsItem<T>::operator()(typename T::Face_handle fh)
{
  for (int i=0; i<3; i++) {
    if ( fh < fh->neighbor(i) || this->t->is_infinite(fh->neighbor(i)) )  {
      if(this->visibleConstraints() && this->t->is_constrained(typename T::Edge(fh,i))){
        this->m_painter->setPen(constraintsPen());
	this->painterostream << this->t->segment(fh,i);
      } else if( this->visibleEdges() ){
	this->m_painter->setPen(this->edgesPen());
	this->painterostream << this->t->segment(fh,i);
      }
    }
    if(this->visibleVertices()) {
      this->paintOneVertex(fh->vertex(i)->point());
    }
  }
}

} // namespace Qt
} // namespace CGAL

#endif // CGAL_Q_CONSTRAINED_TRIANGULATION_GRAPHICS_ITEM_H