QwtPixelMatrix(3) Qwt User's Guide QwtPixelMatrix(3)

QwtPixelMatrix - A bit field corresponding to the pixels of a rectangle.

#include <qwt_pixel_matrix.h>

Inherits QBitArray.


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 const

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.

Parameters

rect Bounding rectangle for the matrix

Definition at line 17 of file qwt_pixel_matrix.cpp.

Returns

Bounding rectangle

Definition at line 48 of file qwt_pixel_matrix.cpp.

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.

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.

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.

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Sun Jul 18 2021 Version 6.2.0