QwtPixelMatrix Class Reference

A bit field corresponding to the pixels of a rectangle. More...

#include <qwt_pixel_matrix.h>

Public Member Functions
	QwtPixelMatrix (const QRect &rect)
	Constructor.
	~QwtPixelMatrix ()
	Destructor.
void	setRect (const QRect &rect)
QRect	rect () const
bool	testPixel (int x, int y) const
	Test if a pixel has been set.
bool	testAndSetPixel (int x, int y, bool on)
	Set a pixel and test if a pixel has been set before.
int	index (int x, int y) const
	Calculate the index in the bit field corresponding to a position.

---

Detailed Description

A bit field corresponding to the pixels of a rectangle.

QwtPixelMatrix is intended to filter out duplicates in an unsorted array of points.

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Constructor & Destructor Documentation

QwtPixelMatrix::QwtPixelMatrix

(

const QRect &

rect

)

Constructor.

Parameters:

rect	Bounding rectangle for the matrix

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Member Function Documentation

int QwtPixelMatrix::index	(	int	x,
		int	y
	)		const [inline]

Calculate the index in the bit field corresponding to a position.

Parameters:

x	X-coordinate
y	Y-coordinate

Returns:

Index, when rect() contains pos - otherwise -1.

QRect QwtPixelMatrix::rect

(

)

const

Returns:

Bounding rectangle

void QwtPixelMatrix::setRect

(

const QRect &

rect

)

Set the bounding rectangle of the matrix

Parameters:

rect	Bounding rectangle

Note:

All bits are cleared

bool QwtPixelMatrix::testAndSetPixel	(	int	x,
		int	y,
		bool	on
	)		[inline]

Set a pixel and test if a pixel has been set before.

Parameters:

x	X-coordinate
y	Y-coordinate
on	Set/Clear the pixel

Returns:

true, when pos is outside of rect(), or when the pixel was set before.

bool QwtPixelMatrix::testPixel	(	int	x,
		int	y
	)		const [inline]

Test if a pixel has been set.

Parameters:

x	X-coordinate
y	Y-coordinate

Returns:

true, when pos is outside of rect(), or when the pixel has already been set.

List of all members.