Qwt User's Guide
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QwtLinearColorMap builds a color map from color stops. More...
#include <qwt_color_map.h>
Public Types | |
enum | Mode { FixedColors, ScaledColors } |
Public Member Functions | |
QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB) | |
QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB) | |
virtual | ~QwtLinearColorMap () |
Destructor. | |
void | setMode (Mode) |
Set the mode of the color map. | |
Mode | mode () const |
void | setColorInterval (const QColor &color1, const QColor &color2) |
void | addColorStop (double value, const QColor &) |
QVector< double > | colorStops () const |
QColor | color1 () const |
QColor | color2 () const |
virtual QRgb | rgb (const QwtInterval &, double value) const |
virtual unsigned char | colorIndex (const QwtInterval &, double value) const |
Map a value of a given interval into a color index. |
QwtLinearColorMap builds a color map from color stops.
A color stop is a color at a specific position. The valid range for the positions is [0.0, 1.0]. When mapping a value into a color it is translated into this interval according to mode().
Build a color map with two stops at 0.0 and 1.0. The color at 0.0 is Qt::blue, at 1.0 it is Qt::yellow.
format | Preferred format of the color map |
QwtLinearColorMap::QwtLinearColorMap | ( | const QColor & | color1, |
const QColor & | color2, | ||
QwtColorMap::Format | format = QwtColorMap::RGB |
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) |
Build a color map with two stops at 0.0 and 1.0.
color1 | Color used for the minimum value of the value interval |
color2 | Color used for the maximum value of the value interval |
format | Preferred format for the color map |
void QwtLinearColorMap::addColorStop | ( | double | value, |
const QColor & | color | ||
) |
Add a color stop
The value has to be in the range [0.0, 1.0]. F.e. a stop at position 17.0 for a range [10.0,20.0] must be passed as: (17.0 - 10.0) / (20.0 - 10.0)
value | Value between [0.0, 1.0] |
color | Color stop |
QColor QwtLinearColorMap::color1 | ( | ) | const |
QColor QwtLinearColorMap::color2 | ( | ) | const |
unsigned char QwtLinearColorMap::colorIndex | ( | const QwtInterval & | interval, |
double | value | ||
) | const [virtual] |
Map a value of a given interval into a color index.
interval | Range for all values |
value | Value to map into a color index |
Implements QwtColorMap.
QVector< double > QwtLinearColorMap::colorStops | ( | ) | const |
QRgb QwtLinearColorMap::rgb | ( | const QwtInterval & | interval, |
double | value | ||
) | const [virtual] |
Map a value of a given interval into a RGB value
interval | Range for all values |
value | Value to map into a RGB value |
Implements QwtColorMap.
void QwtLinearColorMap::setColorInterval | ( | const QColor & | color1, |
const QColor & | color2 | ||
) |
void QwtLinearColorMap::setMode | ( | Mode | mode | ) |
Set the mode of the color map.
FixedColors means the color is calculated from the next lower color stop. ScaledColors means the color is calculated by interpolating the colors of the adjacent stops.