QwtColorMap - QwtColorMap is used to map values into colors.

       Generated automatically by Doxygen for Qwt User's Guide from the source code.

Version 6.1.4                                    Wed Jan 2 2019                                   QwtColorMap(3)

QwtColorMap is used to map values into colors.

       For displaying 3D data on a 2D plane the 3rd dimension is often displayed using colors, like f.e in a
       spectrogram.

       Each color map is optimized to return colors for only one of the following image formats:

       • QImage::Format_Indexed8

       • QImage::Format_ARGB32

       Seealso:QwtPlotSpectrogram, QwtScaleWidget

enumQwtColorMap::Format
       Format for color mapping

       Seealso:rgb(), colorIndex(), colorTable()EnumeratorRGB    The map is intended to map into RGB values.

       Indexed
              The map is intended to map into 8 bit values, that are indices into the color table.

QColorQwtColorMap::color(constQwtInterval&interval,doublevalue)const[inline]
       Map a value into a color

       Parameters:interval Valid interval for values
           value Value

       Returns:
           Color corresponding to value

       Warning:
           This  method is slow for Indexed color maps. If it is necessary to map many values, its better to get
           the color table once and find the color using colorIndex().

   virtualunsignedcharQwtColorMap::colorIndex(constQwtInterval&interval,doublevalue)const[purevirtual]
       Map a value of a given interval into a color index

       Parameters:interval Range for the values
           value Value

       Returns:
           color index, corresponding to value

       Implemented in QwtLinearColorMap.

   QVector<QRgb>QwtColorMap::colorTable(constQwtInterval&interval)const[virtual]
       Build and return a color map of 256 colors

       The color table is needed for rendering indexed images in combination with using colorIndex().

       Parameters:interval Range for the values

       Returns:
           A color table, that can be used for a QImage

   QwtColorMap::FormatQwtColorMap::format()const[inline]Returns:
           Intended format of the color map

       Seealso:FormatvirtualQRgbQwtColorMap::rgb(constQwtInterval&interval,doublevalue)const[purevirtual]
       Map a value of a given interval into a RGB value.

       Parameters:interval Range for the values
           value Value

       Returns:
           RGB value, corresponding to value

       Implemented in QwtAlphaColorMap, and QwtLinearColorMap.

       QwtColorMap - QwtColorMap is used to map values into colors.

       #include <qwt_color_map.h>

       Inherited by QwtAlphaColorMap, and QwtLinearColorMap.

   PublicTypes
       enum Format { RGB, Indexed }

   PublicMemberFunctionsQwtColorMap (Format=QwtColorMap::RGB)
           Constructor.
       virtual ~QwtColorMap ()
           Destructor.
       Formatformat () const
       virtual QRgb rgb (const QwtInterval &interval, double value) const =0
       virtual unsigned char colorIndex (const QwtInterval &interval, double value) const =0
       QColor color (const QwtInterval &, double value) const
       virtual QVector< QRgb > colorTable (const QwtInterval &) const