QwtPixelMatrix - Man Page
A bit field corresponding to the pixels of a rectangle.
Synopsis
#include <qwt_pixel_matrix.h>
Inherits QBitArray.
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.
Public Attributes
int const
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.
Member Function Documentation
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.
Author
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