QwtLinearColorMap - Man Page
QwtLinearColorMap builds a color map from color stops.
Synopsis
#include <qwt_color_map.h>
Inherits QwtColorMap.
Public Types
enum Mode { FixedColors, ScaledColors }
Public Member Functions
QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB)
QwtLinearColorMap (const QColor &color1, const QColor &color2, 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.
Detailed Description
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().
Member Enumeration Documentation
enum QwtLinearColorMap::Mode
Mode of color map
- See also
setMode(), mode()
Enumerator
- FixedColors
Return the color from the next lower color stop.
- ScaledColors
Interpolating the colors of the adjacent stops.
Constructor & Destructor Documentation
QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Format format = QwtColorMap::RGB)
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.
- Parameters
format Preferred format of the color map
QwtLinearColorMap::QwtLinearColorMap (const QColor & color1, const QColor & color2, QwtColorMap::Format format = QwtColorMap::RGB)
Build a color map with two stops at 0.0 and 1.0.
- Parameters
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
Member Function Documentation
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)
- Parameters
value Value between [0.0, 1.0]
color Color stop
QColor QwtLinearColorMap::color1 () const
- Returns
the first color of the color range
- See also
setColorInterval()
QColor QwtLinearColorMap::color2 () const
- Returns
the second color of the color range
- See also
setColorInterval()
unsigned char QwtLinearColorMap::colorIndex (const QwtInterval & interval, double value) const [virtual]
Map a value of a given interval into a color index.
- Parameters
interval Range for all values
value Value to map into a color index- Returns
Index, between 0 and 255
Implements QwtColorMap.
QVector< double > QwtLinearColorMap::colorStops () const
- Returns
Positions of color stops in increasing order
QwtLinearColorMap::Mode QwtLinearColorMap::mode () const
- Returns
Mode of the color map
- See also
setMode()
QRgb QwtLinearColorMap::rgb (const QwtInterval & interval, double value) const [virtual]
Map a value of a given interval into a RGB value
- Parameters
interval Range for all values
value Value to map into a RGB value- Returns
RGB value for value
Implements QwtColorMap.
void QwtLinearColorMap::setColorInterval (const QColor & color1, const QColor & color2)
Set the color range
Add stops at 0.0 and 1.0.
- Parameters
color1 Color used for the minimum value of the value interval
color2 Color used for the maximum value of the value interval- See also
color1(), 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.
- See also
mode()
Author
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