HE::HalfEdge Class Reference

Class that represents the half-edges of the mesh. More...

#include <halfedge.h>

List of all members.

Public Member Functions
	HalfEdge (Vertex *v, Face *f, HalfEdge *t, HalfEdge *n)
	Constructor.
	HalfEdge (Vertex *v, Face *f)
	Constructor.
void	next (HalfEdge *n)
	Sets the next HalfEdge in the Face.
void	twin (HalfEdge *p)
	Sets the symmetric HalfEdge to this one.
void	face (Face *f)
	Sets the associated Face object.
void	dst (Vertex *v)
	Sets the destination Vertex object.
HalfEdge *	next ()
	Returns the next HalfEdge in the Face.
const HalfEdge *	next () const
	Returns the next HalfEdge in the Face. (Const method).
HalfEdge *	prev ()
	Returns the previous HalfEdge in the Face.
const HalfEdge *	prev () const
	Returns the previous HalfEdge in the Face. (Const method).
HalfEdge *	twin ()
	Returns the twin (symmetric) HalfEdge.
const HalfEdge *	twin () const
	Returns the twin (symmetric) HalfEdge. (Const method).
Face *	face ()
	Returns the associated Face object.
const Face *	face () const
	Returns the associated Face object. (Const method).
Vertex *	dst ()
	Returns the destination Vertex of the HalfEdge.
const Vertex *	dst () const
	Returns the destination Vertex of the HalfEdge. (Const method).
Vertex *	src ()
	Returns the source Vertex of the HalfEdge. (DANGEROUS if _twin is not set!).
const Vertex *	src () const
	Returns the source Vertex of the HalfEdge. (Const method) (DANGEROUS if _twin is not set!).
Geometry::Vector3Df	normal () const
	Computes the normal of the HalfEdge (average of the two adjacent faces).
Geometry::Vector3Df	tangent () const
	Returns the tangent direction of the HalfEdge.
Geometry::Vector3Df	midpoint () const
	Returns the middle point of the HalfEdge.
float	squaredLength () const
	Squared length of the HalfEdge.
float	length () const
	Length of the segment.
bool	isBoundary () const
	Tells if the half-edge is in a boundary of the mesh.
Protected Attributes
Vertex *	_dst
Face *	_face
HalfEdge *	_twin
HalfEdge *	_next

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Detailed Description

Class that represents the half-edges of the mesh.

Each edge [a,b] of the mesh is represented by two HalfEdge objects, one from 'a' to 'b' and one the other way around. Each HalfEdge is also associated to the polygon (or hole) that is adjacent to that edge on a given side. By convention, the associated face for a HalfEdge is that which the HalfEdge traverses in countercloskwise order. For example, face [a,b,c] is associated to HalfEdge objects [a,b], [b,c] and [c,a]. The symmetric HalfEdge objects are associated to other faces.

The four differentiating pieces of data a HalfEdge contains are its twin() (or symmetric) HalfEdge, the next() HalfEdge in the associated Face, the face() itself to which the HalfEdge is associated, and the Vertex dst() where the HalfEdge ends.

Definition at line 42 of file halfedge.h.

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The documentation for this class was generated from the following files:

• projects/halfedgelib/libhalfedge/halfedge.h
• projects/halfedgelib/libhalfedge/halfedge.cpp

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