QwtLinearColorMap(3) Qwt User's Guide QwtLinearColorMap(3)

QwtLinearColorMap - QwtLinearColorMap builds a color map from color stops.

#include <qwt_color_map.h>

Inherits QwtColorMap.


enum Mode { FixedColors, ScaledColors }


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 override
virtual uint colorIndex (int numColors, const QwtInterval &, double value) const override
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().

Definition at line 98 of file qwt_color_map.h.

Mode of color map

See also

setMode(), mode()

Enumerator

Return the color from the next lower color stop.
Interpolating the colors of the adjacent stops.

Definition at line 105 of file qwt_color_map.h.

QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Format format = QwtColorMap::RGB) [explicit]

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

Definition at line 351 of file qwt_color_map.cpp.

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

Definition at line 367 of file qwt_color_map.cpp.

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

Definition at line 433 of file qwt_color_map.cpp.

Returns

the first color of the color range

See also

setColorInterval()

Definition at line 451 of file qwt_color_map.cpp.

Returns

the second color of the color range

See also

setColorInterval()

Definition at line 460 of file qwt_color_map.cpp.

Map a value of a given interval into a color index.

Parameters

numColors Size of the color table
interval Range for all values
value Value to map into a color index

Returns

Index, between 0 and 255

Note

NaN values are mapped to 0

Reimplemented from QwtColorMap.

Definition at line 494 of file qwt_color_map.cpp.

QVector< double > QwtLinearColorMap::colorStops () const

Returns

Positions of color stops in increasing order

Definition at line 442 of file qwt_color_map.cpp.

QwtLinearColorMap::Mode QwtLinearColorMap::mode () const

Returns

Mode of the color map

See also

setMode()

Definition at line 400 of file qwt_color_map.cpp.

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.

Definition at line 473 of file qwt_color_map.cpp.

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()

Definition at line 415 of file qwt_color_map.cpp.

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()

Definition at line 391 of file qwt_color_map.cpp.

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Sun Jul 18 2021 Version 6.2.0