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 6.1.3                                    Mon Jun 13 2016                               QwtPixelMatrix(3)