GClasses::GRegionBorderIterator Class Reference

Detailed Description

Iterates the border of a 2D region by running around the border and reporting the coordinates of each interior border pixel and the direction to the edge. It goes in a counter-clockwise direction.

#include <GRegion.h>

Public Member Functions
	GRegionBorderIterator (GImage *pImage, int nSampleX, int nSampleY)
	The point (nSampleX, nSampleY) should be somewhere in the region The image pImage should be a region mask, such that all points in the same region have exactly the same pixel value. More...
	~GRegionBorderIterator ()
bool	next (int *pX, int *pY, int *pDirection)
	If it returns false, the current values are invalid and it's done. If it returns true, pX and pY will hold the coordinates of an interior border pixel. pDirection will be the direction to the edge. 0=right, 1=up, 2=left, 3=down. More...

Protected Member Functions
void	leap ()
bool	look ()

Protected Attributes
bool	m_bOddPass
int	m_direction
int	m_endX
int	m_endY
unsigned int	m_nRegion
GImage *	m_pImage
int	m_x
int	m_y

Constructor & Destructor Documentation

GClasses::GRegionBorderIterator::GRegionBorderIterator	(	GImage *	pImage,
		int	nSampleX,
		int	nSampleY
	)

The point (nSampleX, nSampleY) should be somewhere in the region The image pImage should be a region mask, such that all points in the same region have exactly the same pixel value.

GClasses::GRegionBorderIterator::~GRegionBorderIterator

(

)

Member Function Documentation

void GClasses::GRegionBorderIterator::leap ( )

protected

bool GClasses::GRegionBorderIterator::look ( )

protected

bool GClasses::GRegionBorderIterator::next	(	int *	pX,
		int *	pY,
		int *	pDirection
	)

If it returns false, the current values are invalid and it's done. If it returns true, pX and pY will hold the coordinates of an interior border pixel. pDirection will be the direction to the edge. 0=right, 1=up, 2=left, 3=down.

Member Data Documentation

bool GClasses::GRegionBorderIterator::m_bOddPass

protected

int GClasses::GRegionBorderIterator::m_direction

protected

int GClasses::GRegionBorderIterator::m_endX

protected

int GClasses::GRegionBorderIterator::m_endY

protected

unsigned int GClasses::GRegionBorderIterator::m_nRegion

protected

GImage* GClasses::GRegionBorderIterator::m_pImage

protected

int GClasses::GRegionBorderIterator::m_x

protected

int GClasses::GRegionBorderIterator::m_y

protected