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QwtColorMap
Langue: en
Version: 121612 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
Sommaire
- NAME
- SYNOPSIS
- Detailed Description
- Member Enumeration Documentation
- Constructor & Destructor Documentation
- Member Function Documentation
- QColor QwtColorMap::color (const QwtDoubleInterval & interval, double value) const [inline]
- virtual unsigned char QwtColorMap::colorIndex (const QwtDoubleInterval & interval, double value) const [pure virtual]
- QwtColorTable QwtColorMap::colorTable (const QwtDoubleInterval & interval) const [virtual]
- virtual QwtColorMap* QwtColorMap::copy () const [pure virtual]
- QwtColorMap::Format QwtColorMap::format () const [inline]
- virtual QRgb QwtColorMap::rgb (const QwtDoubleInterval & interval, double value) const [pure virtual]
- Author
NAME
QwtColorMap -SYNOPSIS
Inherited by QwtAlphaColorMap, and QwtLinearColorMap.
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
See also:
- QwtPlotSpectrogram, QwtScaleWidget
Definition at line 44 of file qwt_color_map.h.
Public Types
enum Format { RGB, Indexed }
Public Member Functions
QwtColorMap (Format=QwtColorMap::RGB)
virtual ~QwtColorMap ()
Format format () const
virtual QwtColorMap * copy () const =0
virtual QRgb rgb (const QwtDoubleInterval &interval, double value) const =0
virtual unsigned char colorIndex (const QwtDoubleInterval &interval, double value) const =0
QColor color (const QwtDoubleInterval &, double value) const
virtual QVector< QRgb > colorTable (const QwtDoubleInterval &) const
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.
See also:
- rgb(), colorIndex(), colorTable()
Definition at line 57 of file qwt_color_map.h.
Constructor & Destructor Documentation
QwtColorMap::QwtColorMap (Format = QwtColorMap::RGB)
Constructor.
Definition at line 164 of file qwt_color_map.cpp.
QwtColorMap::~QwtColorMap () [virtual]
Destructor.
Definition at line 170 of file qwt_color_map.cpp.
Member Function Documentation
QColor QwtColorMap::color (const QwtDoubleInterval & interval, double value) 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().
Definition at line 198 of file qwt_color_map.h.
References colorIndex(), colorTable(), and rgb().
virtual unsigned char QwtColorMap::colorIndex (const QwtDoubleInterval & interval, double value) 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.
Referenced by color(), and QwtPainter::drawColorBar().
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
Definition at line 183 of file qwt_color_map.cpp.
References QwtDoubleInterval::isValid(), QwtDoubleInterval::minValue(), rgb(), and QwtDoubleInterval::width().
Referenced by color(), and QwtPainter::drawColorBar().
virtual QwtColorMap* QwtColorMap::copy () const [pure virtual]
Clone the color map.
Implemented in QwtLinearColorMap, and QwtAlphaColorMap.
Referenced by QwtScaleWidget::setColorMap(), and QwtPlotSpectrogram::setColorMap().
QwtColorMap::Format QwtColorMap::format () const [inline]
Returns:
- Intended format of the color map
See also:
- Format
Definition at line 216 of file qwt_color_map.h.
Referenced by QwtPainter::drawColorBar().
virtual QRgb QwtColorMap::rgb (const QwtDoubleInterval & interval, double value) 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 QwtLinearColorMap, and QwtAlphaColorMap.
Referenced by color(), colorTable(), and QwtPainter::drawColorBar().
Author
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