conflicting packages
QwtColorMap(3) | Qwt User's Guide | QwtColorMap(3) |
NAME¶
QwtColorMap -SYNOPSIS¶
#include <qwt_color_map.h> Inherited by QwtAlphaColorMap, and QwtLinearColorMap.Public Types¶
enum Format { RGB, Indexed }
Public Member Functions¶
QwtColorMap (Format=QwtColorMap::RGB)
Detailed Description¶
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
QwtPlotSpectrogram, QwtScaleWidget
Member Enumeration Documentation¶
enum QwtColorMap::Format¶
- •
- RGB
The map is intended to map into QRgb values.
- •
- Indexed
The map is intended to map into 8 bit values, that are indices into the color table.
rgb(), colorIndex(),
colorTable()
Member Function Documentation¶
QColor QwtColorMap::color (const QwtDoubleInterval &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().
virtual unsigned char QwtColorMap::colorIndex (const QwtDoubleInterval &interval, doublevalue) const [pure virtual]¶
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.
QwtColorTable QwtColorMap::colorTable (const QwtDoubleInterval &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::Format QwtColorMap::format () const [inline]¶
Returns:Intended format of the color map
See also:
Format
virtual QRgb QwtColorMap::rgb (const QwtDoubleInterval &interval, doublevalue) const [pure virtual]¶
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.
Author¶
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