Add a submenu to view only inside edges

the edges that triangulate the convex hull outside of the
domain "pollute" the image

GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.cpp

@@ -193,6 +193,8 @@ public slots:
 
   void on_actionShowDelaunay_toggled(bool checked);
 
+  void on_actionShowTriangulationInDomain_toggled(bool checked);
+
   void on_actionShow_constrained_edges_toggled(bool checked);
 
   void on_actionShow_voronoi_edges_toggled(bool checked);
@@ -297,6 +299,7 @@ MainWindow::MainWindow()
   // Check two actions 
   this->actionInsertPolyline->setChecked(true);
   this->actionShowDelaunay->setChecked(true);
+  this->actionShowTriangulationInDomain->setChecked(false);
   this->actionShow_faces_in_domain->setChecked(true);
   this->actionShow_constrained_edges->setChecked(true);
   this->actionShow_voronoi_edges->setChecked(false);
@@ -390,6 +393,23 @@ void
 MainWindow::on_actionShowDelaunay_toggled(bool checked)
 {
   dgi->setVisibleEdges(checked);
+  if(checked)
+  {
+    dgi->setVisibleInsideEdges(false);
+    actionShowTriangulationInDomain->setChecked(false);
+  }
+  update();
+}
+
+void
+MainWindow::on_actionShowTriangulationInDomain_toggled(bool checked)
+{
+  dgi->setVisibleInsideEdges(checked);
+  if(checked)
+  {
+    dgi->setVisibleEdges(false);
+    actionShowDelaunay->setChecked(false);
+  }
   update();
 }
 

GraphicsView/demo/Triangulation_2/Constrained_Delaunay_triangulation_2.ui

@@ -110,6 +110,7 @@
     <addaction name="separator"/>
     <addaction name="actionShowDelaunay"/>
     <addaction name="actionShowVoronoi"/>
+    <addaction name="actionShowTriangulationInDomain"/>
     <addaction name="actionShow_constrained_edges"/>
     <addaction name="actionShow_voronoi_edges"/>
     <addaction name="actionShow_faces_in_domain"/>
@@ -368,6 +369,14 @@
     <string>Show seeds</string>
    </property>
   </action>
+  <action name="actionShowTriangulationInDomain">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>Show triangulation in domain only</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="Constrained_Delaunay_triangulation_2.qrc"/>

GraphicsView/include/CGAL/Qt/DelaunayMeshTriangulationGraphicsItem.h

@@ -32,7 +32,8 @@ namespace CGAL {
 namespace Qt {
 
 template <typename T>
-class DelaunayMeshTriangulationGraphicsItem : public ConstrainedTriangulationGraphicsItem<T>
+class DelaunayMeshTriangulationGraphicsItem
+  : public ConstrainedTriangulationGraphicsItem<T>
 {
   typedef ConstrainedTriangulationGraphicsItem<T> Base;
   typedef typename T::Geom_traits Geom_traits;
@@ -49,6 +50,7 @@ public:
       , seeds_begin()
       , seeds_end()
       , visible_seeds(false)
+      , visible_inside_edges(false)
   {
     setSeedsPen(QPen(::Qt::black, 10.));
   }
@@ -143,6 +145,18 @@ public:
     this->update();
   }
 
+  bool visibleInsideEdges() const
+  {
+    return visible_inside_edges;
+  }
+
+  void setVisibleInsideEdges(const bool b)
+  {
+    visible_inside_edges = b;
+    update();
+  }
+
+
 protected:
   void drawAll(QPainter *painter);
   void paintSeeds(QPainter *painter);
@@ -151,6 +165,7 @@ protected:
   bool visible_blind_faces;
   bool visible_voronoi;
   bool visible_seeds;
+  bool visible_inside_edges;
   typename std::list<Point>::iterator seeds_begin, seeds_end;
   
   QBrush in_domain_brush;
@@ -177,6 +192,20 @@ DelaunayMeshTriangulationGraphicsItem<T>::drawAll(QPainter *painter)
     }
     painter->setBrush(::Qt::NoBrush);
   }
+  if(visibleInsideEdges())
+  {
+    this->painterostream = PainterOstream<typename T::Geom_traits>(painter);
+    painter->setBrush(::Qt::NoBrush);
+    painter->setPen(this->edgesPen());
+    for(typename T::Finite_faces_iterator fit = this->t->finite_faces_begin();
+        fit != this->t->finite_faces_end();
+        ++fit){
+      if(fit->is_in_domain()){
+        this->painterostream << this->t->triangle(fit);
+      }
+    }
+    painter->setBrush(::Qt::NoBrush);
+  }
   if(visibleBlindFaces())
   {
     this->painterostream = PainterOstream<typename T::Geom_traits>(painter);