QwtPixelMatrix Class Reference

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

#include <qwt_pixel_matrix.h>

Inheritance diagram for QwtPixelMatrix:

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

Private Attributes
QRect	d_rect

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.

Definition at line 24 of file qwt_pixel_matrix.h.

Constructor & Destructor Documentation

QwtPixelMatrix::QwtPixelMatrix ( const QRect &  rect )

explicit

Constructor.

Parameters

rect	Bounding rectangle for the matrix

Definition at line 17 of file qwt_pixel_matrix.cpp.

QwtPixelMatrix::~QwtPixelMatrix

(

)

Destructor.

Definition at line 24 of file qwt_pixel_matrix.cpp.

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.

Definition at line 86 of file qwt_pixel_matrix.h.

QRect QwtPixelMatrix::rect

(

)

const

Returns

Bounding rectangle

Definition at line 48 of file qwt_pixel_matrix.cpp.

void QwtPixelMatrix::setRect

(

const QRect &

rect

)

Set the bounding rectangle of the matrix

Parameters

rect	Bounding rectangle

Note

All bits are cleared

Definition at line 35 of file qwt_pixel_matrix.cpp.

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.

Definition at line 67 of file qwt_pixel_matrix.h.

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.

Definition at line 51 of file qwt_pixel_matrix.h.

Member Data Documentation

QRect QwtPixelMatrix::d_rect

private

Definition at line 39 of file qwt_pixel_matrix.h.

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

• qwt_pixel_matrix.h
• qwt_pixel_matrix.cpp