GEOM_FADE25D::TriangleAroundVertexIterator Class Reference

Iterator for all triangles around a given vertex. More...

#include <TriangleAroundVertexIterator.h>

Public Member Functions
	TriangleAroundVertexIterator (const Point2 *pPnt_)
	Constructor. More...
	TriangleAroundVertexIterator (const TriangleAroundVertexIterator &it)
	Copy constructor. More...
	TriangleAroundVertexIterator (Point2 *pPnt_, Triangle2 *pTr_)
	Constructor. More...
bool	operator!= (const TriangleAroundVertexIterator &rhs)
	operator!=() More...
Triangle2 *	operator* ()
	Returns a pointer to the current triangle (or NULL) More...
TriangleAroundVertexIterator &	operator++ ()
	Proceed to the next triangle (the one in counterclockwise order) More...
TriangleAroundVertexIterator &	operator-- ()
	Proceed to the previous triangle (the one in clockwise order) More...
TriangleAroundVertexIterator &	operator= (const TriangleAroundVertexIterator &other)
bool	operator== (const TriangleAroundVertexIterator &rhs)
	operator==() More...
Triangle2 *	previewNextTriangle ()
	Preview next triangle (CCW direction) More...
Triangle2 *	previewPrevTriangle ()
	Preview previous triangle (CW direction) More...

Protected Member Functions
void	loop ()

Protected Attributes
const Point2 *	pPnt
Triangle2 *	pSavedTr
Triangle2 *	pTr

Detailed Description

The TriangleAroundVertexIterator iterates over all triangles incident to a given vertex of a Fade_2D instance. The advantage is that the incident triangles can be visited in a certain order, namely counterclockwise with operator++() or clockwise using operator--(). If the order is not important you can use Fade_2D::getIncidentTriangles() instead.

Left: the iterator visits the triangles around a vertex in a circular manner. Right: Incrementing/decrementing the iterator at a border triangle makes it point to NULL and another increment/decrement sets it to the next border triangle

Constructor & Destructor Documentation

TriangleAroundVertexIterator() [1/3]

GEOM_FADE25D::TriangleAroundVertexIterator::TriangleAroundVertexIterator ( const Point2 *  pPnt_ )

inlineexplicit

Parameters

pPnt_

is the vertex whose incident triangles can be visited with the iterator

Initially the iterator points to an arbitrary triangle (not NULL)

TriangleAroundVertexIterator() [2/3]

GEOM_FADE25D::TriangleAroundVertexIterator::TriangleAroundVertexIterator ( Point2 *  pPnt_, Triangle2 *  pTr_  )

inline

Parameters

pPnt_	is the vertex whose incident triangles can be visited with the iterator
pTr_	is the triangle the iterator initially points to

TriangleAroundVertexIterator() [3/3]

GEOM_FADE25D::TriangleAroundVertexIterator::TriangleAroundVertexIterator ( const TriangleAroundVertexIterator &  it )

inline

Copies the iterator it

Member Function Documentation

operator!=()

bool GEOM_FADE25D::TriangleAroundVertexIterator::operator!= ( const TriangleAroundVertexIterator &  rhs )

inline

Compares the center and the current triangle of *this and rhs

Returns

true when they are different, false otherwise

operator*()

Triangle2* GEOM_FADE25D::TriangleAroundVertexIterator::operator* ( )

inline

Dereferencing the iterator yields a pointer to the triangle to which the iterator points.

Warning

This method might yield NULL at the border of a triangulation.

operator++()

TriangleAroundVertexIterator& GEOM_FADE25D::TriangleAroundVertexIterator::operator++ ( )

inline

Moves the iterator to the next triangle in counterclockwise order.

Warning

At the border of a triangulation, two border edges exist which are incident to the center vertex. Consequently, the neighbor triangles are NULL there. If operator++() leads the iterator off the triangulation then the iterator will point to NULL. Another call to operator++() will set the iterator to the next triangle in counterclockwise order.

operator--()

TriangleAroundVertexIterator& GEOM_FADE25D::TriangleAroundVertexIterator::operator-- ( )

inline

Moves the iterator to the next triangle in clockwise order.

Warning

At the border of a triangulation, two border edges are incident to the center vertex. Consequently, the neighbor triangles are NULL there. If operator--() leads the iterator off the triangulation then the iterator will point to NULL. Another call to operator--() will set the iterator to the next triangle in clockwise order.

operator==()

bool GEOM_FADE25D::TriangleAroundVertexIterator::operator== ( const TriangleAroundVertexIterator &  rhs )

inline

Compares the center and the current triangle of *this and rhs

Returns

true when they are identically or false otherwise

previewNextTriangle()

Triangle2* GEOM_FADE25D::TriangleAroundVertexIterator::previewNextTriangle ( )

inline

Returns

the next triangle (the one in CCW direction) without changing the current position.

Warning

This method might yield NULL at the border of a triangulation.

previewPrevTriangle()

Triangle2* GEOM_FADE25D::TriangleAroundVertexIterator::previewPrevTriangle ( )

inline

Returns

the previous triangle (the one in CW direction) without changing the current position.

Warning

This method might yield NULL at the border of a triangulation.

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

• TriangleAroundVertexIterator.h