Provided by: libqwt-doc_6.1.4-2build2_all 

NAME
QwtPixelMatrix - 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. 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.
Constructor & Destructor Documentation
QwtPixelMatrix::QwtPixelMatrix (const QRect & rect) Constructor. Parameters: rect Bounding rectangle for the matrix
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.
Author
Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.1.4 Wed Jan 2 2019 QwtPixelMatrix(3)