QwtColorMap is used to map values into colors. More...
#include <qwt_color_map.h>
Public Types | |
| enum | Format { RGB, Indexed } |
Public Member Functions | |
| QColor | color (const QwtInterval &, double value) const |
| virtual uint | colorIndex (int numColors, const QwtInterval &interval, double value) const |
| Map a value of a given interval into a color index. | |
| virtual QVector< QRgb > | colorTable (int numColors) const |
| virtual QVector< QRgb > | colorTable256 () const |
| Format | format () const |
| QwtColorMap (Format=QwtColorMap::RGB) | |
| virtual QRgb | rgb (const QwtInterval &interval, double value) const =0 |
| void | setFormat (Format) |
| virtual | ~QwtColorMap () |
| Destructor. | |
Private Attributes | |
| Format | d_format |
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 33 of file qwt_color_map.h.
Member Enumeration Documentation
| enum QwtColorMap::Format |
Format for color mapping
- See also:
- rgb(), colorIndex(), colorTable()
- Enumerator:
RGB The map is intended to map into RGB values.
Indexed Map values into 8 bit values, that are used as indexes into the color table.
Indexed color maps are used to generate QImage::Format_Indexed8 images. The calculation of the color index is usually faster and the resulting image has a lower memory footprint.
- See also:
- colorIndex(), colorTable()
Definition at line 41 of file qwt_color_map.h.
Constructor & Destructor Documentation
| QwtColorMap::QwtColorMap | ( | Format | format = QwtColorMap::RGB | ) | [explicit] |
Constructor
- Parameters:
-
format Format of the color map
Definition at line 263 of file qwt_color_map.cpp.
| QwtColorMap::~QwtColorMap | ( | ) | [virtual] |
Destructor.
Definition at line 269 of file qwt_color_map.cpp.
Member Function Documentation
| QColor QwtColorMap::color | ( | const QwtInterval & | interval, |
| double | value | ||
| ) | const [inline] |
Map a value into a color
- Parameters:
-
interval Valid interval for values value Value
- Returns:
- Color corresponding to value
Definition at line 239 of file qwt_color_map.h.
| uint QwtColorMap::colorIndex | ( | int | numColors, |
| const QwtInterval & | interval, | ||
| double | value | ||
| ) | const [virtual] |
Map a value of a given interval into a color index.
- Parameters:
-
numColors Number of colors interval Range for all values value Value to map into a color index
- Returns:
- Index, between 0 and numColors - 1, or -1 for an invalid value
Reimplemented in QwtLinearColorMap.
Definition at line 297 of file qwt_color_map.cpp.
| QVector< QRgb > QwtColorMap::colorTable | ( | int | numColors | ) | const [virtual] |
Build and return a color map of arbitrary number of colors
The color table is needed for rendering indexed images in combination with using colorIndex().
- Parameters:
-
numColors Number of colors
- Returns:
- A color table
Definition at line 355 of file qwt_color_map.cpp.
| QVector< QRgb > QwtColorMap::colorTable256 | ( | ) | 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().
- Returns:
- A color table, that can be used for a QImage
Definition at line 334 of file qwt_color_map.cpp.
| QwtColorMap::Format QwtColorMap::format | ( | ) | const [inline] |
- Returns:
- Intended format of the color map
- See also:
- Format
Definition at line 249 of file qwt_color_map.h.
| virtual QRgb QwtColorMap::rgb | ( | const QwtInterval & | 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 QwtSaturationValueColorMap, QwtHueColorMap, QwtAlphaColorMap, and QwtLinearColorMap.
| void QwtColorMap::setFormat | ( | Format | format | ) |
Set the format of the color map
- Parameters:
-
format Format of the color map
Definition at line 278 of file qwt_color_map.cpp.
Member Data Documentation
Format QwtColorMap::d_format [private] |
Definition at line 85 of file qwt_color_map.h.
The documentation for this class was generated from the following files: