Get rid of construct_segment/construct_ray/intersect/assign in Vertex_visibility_graph

Partition_2/examples/Partition_2/y_monotone_partition_indices_2.cpp

@@ -43,7 +43,7 @@ int main( )
 
   Polygon_list partition_polys;
 
-  CGAL::y_monotone_partition_2(polygon.vertices_begin(),
+  CGAL::optimal_convex_partition_2(polygon.vertices_begin(),
                                polygon.vertices_end(),
                                std::back_inserter(partition_polys),
                                traits);

Partition_2/include/CGAL/Partition_2/Rotation_tree_node_2.h

@@ -45,8 +45,9 @@ namespace CGAL {
 template <class Traits> class Rotation_tree_2;
 
 template <class Traits>
-class Rotation_tree_node_2 : public Traits::Point_2
+class Rotation_tree_node_2
 {
+  typename Traits::Point_2 point;
 public:
 
    typedef typename Traits::Point_2          Base_point;
@@ -56,7 +57,7 @@ public:
    typedef std::pair<Tree_iterator, bool>    Node_ref;
 
 
-   Rotation_tree_node_2(Base_point p) : Base_point(p)
+   Rotation_tree_node_2(Base_point p) : point(p)
    { 
       _parent.second = false;
       _left_sibling.second = false;
@@ -64,6 +65,9 @@ public:
       _rightmost_child.second = false;
    }
 
+   operator Base_point() const
+   { return point;}
+  
    bool has_left_sibling() const
    {  return _left_sibling.second; }
 

Partition_2/include/CGAL/Partition_2/Vertex_visibility_graph_2.h

@@ -96,11 +96,11 @@ private:
                                             Collinear_are_ordered_along_line_2;
    typedef typename Traits::Are_strictly_ordered_along_line_2 
                                             Are_strictly_ordered_along_line_2;
-   typedef typename Traits::Construct_segment_2 
+  //   typedef typename Traits::Construct_segment_2 
-                                            Construct_segment_2; 
+  //                                          Construct_segment_2; 
-   typedef typename Traits::Construct_ray_2   Construct_ray_2; 
+  //   typedef typename Traits::Construct_ray_2   Construct_ray_2; 
-   typedef typename Traits::Intersect_2       Intersect_2; 
+  //  typedef typename Traits::Intersect_2       Intersect_2; 
-   typedef typename Traits::Assign_2          Assign_2; 
+  // typedef typename Traits::Assign_2          Assign_2; 
    typedef CGAL::Segment_less_yx_2<Traits>    Segment_less_yx_2;
 
    typedef Rotation_tree_2<Traits>            Tree;
@@ -140,10 +140,10 @@ public:
      are_strictly_ordered_along_line_2(
            traits.are_strictly_ordered_along_line_2_object()),
      less_xy_2(traits.less_xy_2_object()),
-     construct_segment_2(traits.construct_segment_2_object()),
+     //     construct_segment_2(traits.construct_segment_2_object()),
-     construct_ray_2(traits.construct_ray_2_object()),
+     //construct_ray_2(traits.construct_ray_2_object()),
-     intersect_2(traits.intersect_2_object()),
+     //intersect_2(traits.intersect_2_object()),
-     assign_2(traits.assign_2_object()),
+     //assign_2(traits.assign_2_object()),
      edges(Point_pair_compare(traits))
    {
      build(first, beyond, traits);
@@ -156,8 +156,8 @@ public:
       Polygon         polygon(first,beyond);
       Tree            tree(polygon.begin(), polygon.end(),traits);
 
-      Vertex_map  vertex_map;
+      Vertex_map  vertex_map(less_xy_2);
-      initialize_vertex_map(polygon, vertex_map,traits);
+      initialize_vertex_map(polygon, vertex_map, traits);
    
       // NOTE:  use the std::list as the basis here because otherwise the basis
       //        is a deque, which is buggy under MSVC++
@@ -421,10 +421,10 @@ private:
    Collinear_are_ordered_along_line_2    collinear_ordered_2;
    Are_strictly_ordered_along_line_2     are_strictly_ordered_along_line_2;
    Less_xy_2                             less_xy_2;
-   Construct_segment_2                   construct_segment_2;
+  //   Construct_segment_2                   construct_segment_2;
-   Construct_ray_2                       construct_ray_2;
+  // Construct_ray_2                       construct_ray_2;
-   Intersect_2                           intersect_2;
+  //Intersect_2                           intersect_2;
-   Assign_2                              assign_2;
+  // Assign_2                              assign_2;
    Edge_set                              edges;
 };
 

Partition_2/include/CGAL/Partition_2/Vertex_visibility_graph_2_impl.h

@@ -522,6 +522,8 @@ void Vertex_visibility_graph_2<Traits>::update_visibility(
       // don't need to do this for the previous visibility point since
       // if it were closer to p than q when looking from p to q, q would
       // not be visible.
+
+ #if 0     
       Segment_2 next_seg = construct_segment_2(*(*p_it).second.second, 
                                                *next_v_p);
       Ray_2 ray = construct_ray_2((*p_it).first, (*q_it).first);
@@ -535,18 +537,7 @@ void Vertex_visibility_graph_2<Traits>::update_visibility(
          if (collinear_ordered_2((*p_it).first, (*q_it).first, i_point))
          {
             (*p_it).second.second = (*q_it).second.first;
-#ifdef CGAL_VISIBILITY_GRAPH_DEBUG
-            std::cout << "p sees something in direction of q, but q is closer;"
-                      << " p sees q" << std::endl;
-#endif 
          }
-#ifdef CGAL_VISIBILITY_GRAPH_DEBUG
-         else 
-         {
-            std::cout << "p sees something in direction of q that's closer "
-                      << "than q; p doesn't see  q" << std::endl;
-         }
-#endif 
       }
       else if (assign_2(i_seg, next_result))
       {
@@ -554,27 +545,57 @@ void Vertex_visibility_graph_2<Traits>::update_visibility(
              collinear_ordered_2((*p_it).first,(*q_it).first,i_seg.target()))
          {
             (*p_it).second.second = (*q_it).second.first;
-#ifdef CGAL_VISIBILITY_GRAPH_DEBUG
-            std::cout << "p sees something in direction of q, but q is closer;"
-                      << " p sees q" << std::endl;
-#endif 
          }
-#ifdef CGAL_VISIBILITY_GRAPH_DEBUG
+ 
-         else 
-         {
-            std::cout << "p sees something in direction of q that's closer "
-                      << " than q; p doesn't see  q" << std::endl;
-         }
-#endif 
       }
       else
       {
          (*p_it).second.second = (*q_it).second.first;
-#ifdef CGAL_VISIBILITY_GRAPH_DEBUG
-         std::cout << "p doesn't see something in direction of q; p sees q" 
-                   << std::endl;
-#endif 
       }
+#else
+      // Segment ab  and Ray pq
+      Point_2 a = *(*p_it).second.second;
+      Point_2 b =  *next_v_p;
+      Point_2 p = (*p_it).first;
+      Point_2 q = (*q_it).first;
+      Orientation pqa = orientation_2(p,q,a);
+      Orientation pqb = orientation_2(p,q,b);
+      Orientation abp = orientation_2(a,b,p);
+      Orientation abq = orientation_2(a,b,q);
+      bool change = false;
+      if((pqa == COLLINEAR)&& (pqb == COLLINEAR)){
+        // the segment lies on the supporting line of the ray
+        if(collinear_ordered_2(p,q,a) && collinear_ordered_2(p,q,b)){
+          change = true;
+        }
+      } else if (pqa == COLLINEAR){
+        if (collinear_ordered_2(p,q,a)){ // forget about b as it is not collinear
+          change = true;
+        }
+      } else if (pqb == COLLINEAR){
+        if (collinear_ordered_2(p,q,b)){ // forget about a
+          change = true;
+        }
+      }else if(pqa == pqb){
+        // no intersection as the segment is completely to the left or to the right of the ray
+      }else if((abp == COLLINEAR) || (abq == COLLINEAR) ){
+        // do nothing because when a ray point lies on the segment collinear_ordered_2 will be false
+      } else if (abp != abq){
+        // do nothing as i between p and q
+      } else if(pqb == RIGHT_TURN){
+        if(abp == RIGHT_TURN){
+          change = true;
+        }
+      } else {
+        CGAL_assertion(pqa == RIGHT_TURN);
+        if(abp == LEFT_TURN){
+          change = true;
+        }
+      }
+      if(change){
+        (*p_it).second.second = (*q_it).second.first;
+      }
+#endif      
    }
    else // p sees what q sees
    {

Partition_2/include/CGAL/Partition_traits_adapter_2.h

@@ -117,7 +117,7 @@ public:
     typename K::Collinear_are_ordered_along_line_2::result_type
     operator()(Arg_type p, Arg_type q, Arg_type r) const
     {
-      return fct(get(ppmap,p), get(ppmap,q), r.first);
+      return fct(get(ppmap,p), get(ppmap,q), get(ppmap,r));
     }
   };
 
@@ -204,11 +204,11 @@ public:
 
   Collinear_are_ordered_along_line_2
   collinear_are_ordered_along_line_2_object() const
-  { return Collinear_are_ordered_along_line_2(); }
+  { return Collinear_are_ordered_along_line_2(ppmap,static_cast<const Base_traits*>(this)->collinear_are_ordered_along_line_2_object()); }
 
   Are_strictly_ordered_along_line_2
   are_strictly_ordered_along_line_2_object() const
-  { return Are_strictly_ordered_along_line_2(); }
+  { return Are_strictly_ordered_along_line_2(ppmap,static_cast<const Base_traits*>(this)->are_strictly_ordered_along_line_2_object()); }
 
   
   Is_horizontal_2