CGAL 5.5.2  2D Straight Skeleton and Polygon Offsetting

The concept StraightSkeletonHalfedge_2
describes the requirements for the halfedge type of the StraightSkeleton_2
concept. It is a refinement of the HalfedgeDSHalfedge
concept.
The StraightSkeletonHalfedge_2
concept requires no geometric embedding at all. The only geometric embedding used by the Straight Skeleton Data Structure are the 2D points in the contour and skeleton vertices. However, for any halfedge, there is a 2D segment implicitly given by its source
and target
vertices.
StraightSkeleton_2
StraightSkeletonHalfedge_2
CGAL::Straight_skeleton_vertex_base_2<Refs,Point,FT>
CGAL::Straight_skeleton_halfedge_base_2<Refs>
Creation  
StraightSkeletonHalfedge_2 ()  
Default Constructor.  
StraightSkeletonHalfedge_2 (int id)  
constructs a halfedge with ID id . More...  
Access Functions  
Halfedge_handle  defining_contour_edge () 
Halfedge_const_handle  defining_contour_edge () const 
If this is a bisector halfedge, returns a handle to the inwardfacing (nonborder) contour halfedge corresponding to the defining contour edge which is to its left; if this is a contour halfedge, returns a handle to itself if is_border() is false , or to its opposite if it is true .  
Queries  
bool  is_bisector () const 
returns true iff this is a bisector (or skeleton) halfedge (i.e. is not a contour halfedge).  
bool  is_inner_bisector () const 
returns true iff this is a bisector and is inner (i.e. is not incident upon a contour vertex).  
StraightSkeletonHalfedge_2::StraightSkeletonHalfedge_2  (  int  id  ) 
constructs a halfedge with ID id
.
It is the links to other halfedges that determines if this is a contour edge, a contourskeleton edge, or an innerskeleton edge.