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Qwt User's Guide
5.2.3
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#include <qwt_color_map.h>

Public Types | |
| enum | Format { RGB, Indexed } |
Public Member Functions | |
| QwtColorMap (Format=QwtColorMap::RGB) | |
| virtual | ~QwtColorMap () |
| QColor | color (const QwtDoubleInterval &, double value) const |
| virtual unsigned char | colorIndex (const QwtDoubleInterval &interval, double value) const =0 |
| virtual QVector< QRgb > | colorTable (const QwtDoubleInterval &) const |
| virtual QwtColorMap * | copy () const =0 |
| Format | format () const |
| virtual QRgb | rgb (const QwtDoubleInterval &interval, double value) const =0 |
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:
| enum QwtColorMap::Format |
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inline |
Map a value into a color
| interval | Valid interval for values |
| value | Value |
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pure virtual |
Map a value of a given interval into a color index
| interval | Range for the values |
| value | Value |
Implemented in QwtLinearColorMap.
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virtual |
Build and return a color map of 256 colors
The color table is needed for rendering indexed images in combination with using colorIndex().
| interval | Range for the values |
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inline |
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pure virtual |
Map a value of a given interval into a rgb value.
| interval | Range for the values |
| value | Value |
Implemented in QwtAlphaColorMap, and QwtLinearColorMap.
1.8.1