QwtPixelMatrix类 参考

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

#include <qwt_pixel_matrix.h>

类 QwtPixelMatrix 继承关系图:

Public 成员函数
	QwtPixelMatrix (const QRect &rect)
	Constructor
	~QwtPixelMatrix ()
	Destructor
void	setRect (const QRect &rect)
	Set the bounding rectangle of the matrix
QRect	rect () const
	Get the bounding rectangle
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

详细描述

A bit field corresponding to the pixels of a rectangle

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

构造及析构函数说明

QwtPixelMatrix()

QwtPixelMatrix::QwtPixelMatrix ( const QRect &  rect )

explicit

Constructor

参数

[in]

rect

Bounding rectangle for the matrix

成员函数说明

index()

int QwtPixelMatrix::index ( int  x, int  y  ) const

inline

Calculate the index in the bit field corresponding to a position

参数

[in]	x	X-coordinate
[in]	y	Y-coordinate

返回

Index when rect() contains position, otherwise -1

rect()

QRect QwtPixelMatrix::rect

(

)

const

Get the bounding rectangle

返回

Bounding rectangle

setRect()

void QwtPixelMatrix::setRect

(

const QRect &

rect

)

Set the bounding rectangle of the matrix

参数

[in]

rect

Bounding rectangle

注解

All bits are cleared

testAndSetPixel()

bool QwtPixelMatrix::testAndSetPixel ( int  x, int  y, bool  on  )

inline

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

参数

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

返回

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

testPixel()

bool QwtPixelMatrix::testPixel ( int  x, int  y  ) const

inline

Test if a pixel has been set

参数

[in]	x	X-coordinate
[in]	y	Y-coordinate

返回

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

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/plot/qwt_pixel_matrix.h
• /home/runner/work/QWT/QWT/src/plot/qwt_pixel_matrix.cpp