added colors to the triangles

Envelope_3/demo/Envelope_3/envelope_3.cpp

@@ -32,9 +32,8 @@ int main(int, char*){
 #include <fstream>
 #include <string>
 
-#include "typedefs.h"
-
 #include <CGAL/IO/Qt_widget.h>
+#include <CGAL/Random.h> 
 
 
 
@@ -63,6 +62,7 @@ int main(int, char*){
 #include <qpixmap.h> 
 #include <qpainter.h> 
 #include <qpushbutton.h> 
+#include "typedefs.h"
 
 
 //The envelope diagram
@@ -82,7 +82,19 @@ public:
   // this method overrides the virtual method 'draw()' of Qt_widget_layer
   void draw()
   {
-    widget->lock(); // widget have to be locked before drawing 
+    widget->lock(); // widget have to be locked before drawing
+
+    
+    for(Face_const_iterator fit = diag.faces_begin();
+        fit != diag.faces_end();
+        ++fit)
+    {
+      if(! fit->number_of_surfaces())
+        continue;
+
+      draw_face(widget, fit);
+    }
+
     *widget <<  CGAL::BLUE; 
     for(Edge_const_iterator eit = diag.edges_begin();
         eit != diag.edges_end();
@@ -197,7 +209,7 @@ public slots:
       if(s==QString::null)
         return;
       curr_dir = s;
-
+      
       std::ifstream in_file(s);
       if(!in_file.is_open())
       {
@@ -214,11 +226,16 @@ public slots:
       std::list<Surface_3> triangles;
       int num_of_triangles;
       in_file >> num_of_triangles;
+      CGAL::Random rand;
       for(int i=0 ; i<num_of_triangles; i++)
       {
+        int r = rand.get_int(0, 256);
+        int g = rand.get_int(0, 256);
+        int b = rand.get_int(0, 256);
+
         Triangle_3 tri;
         in_file >> tri;
-        triangles.push_back(tri);
+        triangles.push_back(Surface_3(tri, CGAL::Color(r, g, b)));
         box = box + bbox_2d(tri);
       }
       diag.clear();

Envelope_3/demo/Envelope_3/typedefs.h

@@ -23,7 +23,12 @@
 #include <CGAL/Lazy_exact_nt.h>
 #include <CGAL/envelope_3.h>
 #include <CGAL/Env_triangle_traits_3.h>
+#include <CGAL/Env_surface_data_traits_3.h>
 #include <CGAL/Bbox_2.h> 
+#include <CGAL/IO/Color.h> 
+#include <CGAL/Polygon_2.h>
+#include <CGAL/IO/Qt_widget_Polygon_2.h>
+#include <qpainter.h> 
 
 #ifdef CGAL_USE_GMP
 
@@ -47,14 +52,21 @@ typedef Kernel::Point_2				                        Point_2;
 typedef Kernel::Point_3				                        Point_3;
 typedef Kernel::Triangle_2				                    Triangle_2;
 typedef Kernel::Triangle_3				                    Triangle_3;
+typedef CGAL::Polygon_2<Kernel>                       Polygon_2;
 
 
-typedef CGAL::Env_triangle_traits_3<Kernel>           Traits;
+typedef CGAL::Env_triangle_traits_3<Kernel>           Base_traits;
+typedef CGAL::Env_surface_data_traits_3<Base_traits, 
+                                        CGAL::Color>  Traits;
 typedef Traits::Surface_3                             Surface_3;
 typedef Traits::Xy_monotone_surface_3                 Xy_monotone_surface_3;
 typedef CGAL::Envelope_diagram_2<Traits>              Envelope_diagram_2;
 typedef Envelope_diagram_2::Edge_const_iterator       Edge_const_iterator;
 typedef Envelope_diagram_2::Vertex_const_iterator     Vertex_const_iterator;
+typedef Envelope_diagram_2::Face_const_iterator       Face_const_iterator;
+typedef Envelope_diagram_2::Hole_const_iterator       Hole_const_iterator;
+typedef Envelope_diagram_2::Ccb_halfedge_const_circulator 
+                                                      Ccb_halfedge_const_circulator;
 
 CGAL::Bbox_2 bbox_2d(const Triangle_3& tri)
 {
@@ -66,4 +78,52 @@ CGAL::Bbox_2 bbox_2d(const Triangle_3& tri)
                       Point_2(p2.x(), p2.y()));
   return proj_tri.bbox();
 }
+
+void construct_polygon(Ccb_halfedge_const_circulator ccb, Polygon_2& pgn)
+{
+  /* running with around the outer of the face and generate from it
+    * polygon
+    */
+  
+  Ccb_halfedge_const_circulator cc=ccb;
+  do 
+  {
+    pgn.push_back(cc->source()->point());
+    //created from the outer boundary of the face
+  } 
+  while (++cc !=ccb);
+
+}
+void draw_face(CGAL::Qt_widget* w, Face_const_iterator f)
+{
+  if(f->is_unbounded())
+    return;
+  
+  Qt::RasterOp old_rasterop = w->rasterOp();
+  w->get_painter().setRasterOp(Qt::XorROP);
+  // make polygon from the outer ccb of the face 'f'
+  Polygon_2 pgn;
+  construct_polygon(f->outer_ccb(), pgn);
+
+
+  w->setFilled(true);
+  CGAL::Color c = f->surface().data();
+  w->setFillColor(c);
+
+  (*w) << pgn ;  // draw the polyong
+
+ 
+  for(Hole_const_iterator hit = f->holes_begin();
+      hit != f->holes_end();
+      ++hit)
+  {
+    Polygon_2 hole;
+    construct_polygon(*hit, hole);
+    (*w) << hole ;  // draw the polyong
+  }
+  w->get_painter().setRasterOp(old_rasterop);
+  w->setFilled(false);
+  
+}
+
 #endif