DOKK / manpages / debian 10 / libqwt5-doc / QwtLinearColorMap.3.en
QwtLinearColorMap(3) Qwt User's Guide QwtLinearColorMap(3)

QwtLinearColorMap -

#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)
QwtLinearColorMap (const QwtLinearColorMap &)
virtual ~QwtLinearColorMap ()
void addColorStop (double value, const QColor &)
QColor color1 () const
QColor color2 () const
virtual unsigned char colorIndex (const QwtDoubleInterval &, double value) const
QwtArray< double > colorStops () const
virtual QwtColorMap * copy () const
Mode mode () const
QwtLinearColorMap & operator= (const QwtLinearColorMap &)
virtual QRgb rgb (const QwtDoubleInterval &, double value) const
void setColorInterval (const QColor &color1, const QColor &color2)
void setMode (Mode)

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. If mode() == FixedColors the color is calculated from the next lower color stop. If mode() == ScaledColors the color is calculated by interpolating the colors of the adjacent stops.

Mode of color map

See also:

setMode(), 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.

Parameters:

format Preferred format of the color map

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 of the coor map

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

Returns:

the first color of the color range

See also:

setColorInterval()

Returns:

the second color of the color range

See also:

setColorInterval()

Map a value of a given interval into a color index, between 0 and 255

Parameters:

interval Range for all values
value Value to map into a color index

Implements QwtColorMap.

Return all positions of color stops in increasing order

QwtLinearColorMap::Mode QwtLinearColorMap::mode () const

Returns:

Mode of the color map

See also:

setMode()

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

Implements QwtColorMap.

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()

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()

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Tue Nov 20 2012 Version 5.2.3