CGAL 6.0  2D Triangulations

In a constrained triangulation, the information about constrained edges is stored in the faces of the triangulation. The base face of a constrained triangulation has to be a model of the concept ConstrainedTriangulationFaceBase_2
which refines the concept TriangulationFaceBase_2
providing functionalities to deal with constraints.
TriangulationFaceBase_2
Types
Defines the same types as the TriangulationFaceBase_2
concept
CGAL::Constrained_triangulation_face_base_2<Traits>
TriangulationFaceBase_2
CGAL::Constrained_triangulation_2<Traits,Tds>
CGAL::Constrained_triangulation_face_base_2<Traits>
Access Functions  
bool  is_constrained (int i) 
returns true if the edge between the face and its neighbor neighbor(i) is constrained.  
Modifiers  
void  set_constraint (int i, bool b) 
This is an advanced function.  
void  set_constraints (bool c0, bool c1, bool c2) 
This is an advanced function.  
void  reorient () 
This is an advanced function.  
void  ccw_permute () 
This is an advanced function.  
void  cw_permute () 
This is an advanced function.  
Miscellaneous  
bool  is_valid () 
This is an advanced function.  
void ConstrainedTriangulationFaceBase_2::ccw_permute  (  ) 
This is an advanced function.
performs a counterclockwise permutation of the vertices, neighbors and constrained status of the face.
void ConstrainedTriangulationFaceBase_2::cw_permute  (  ) 
This is an advanced function.
performs a clockwise permutation of the vertices and neighbors and constrained status of the face.
bool ConstrainedTriangulationFaceBase_2::is_constrained  (  int  i  ) 
returns true
if the edge between the face and its neighbor neighbor(i)
is constrained.
bool ConstrainedTriangulationFaceBase_2::is_valid  (  ) 
This is an advanced function.
tests the validity of the face as a face of a plain triangulation and additionally checks if the edges of the face are consistently marked as constrained or unconstrained edges in the face and its neighbors.
void ConstrainedTriangulationFaceBase_2::reorient  (  ) 
This is an advanced function.
changes the orientation of the face by exchanging vertex(0)
with vertex(1)
and neighbor(0)
with neighbor(1)
and the corresponding constrained status.
void ConstrainedTriangulationFaceBase_2::set_constraint  (  int  i, 
bool  b  
) 
This is an advanced function.
sets the edge between the face and its neighbor neighbor(i)
as a constrained or unconstrained edge according to b
.
void ConstrainedTriangulationFaceBase_2::set_constraints  (  bool  c0, 
bool  c1,  
bool  c2  
) 
This is an advanced function.
sets the status (constrained or unconstrained) of the three edges of the face.