QwtLinearColorMap (3)

#include <qwt_color_map.h>

Inherits QwtColorMap.

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)

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.

enum \fBQwtLinearColorMap::Mode\fP

Mode of color map

See also:

setMode(), mode()

QwtLinearColorMap::QwtLinearColorMap (\fBQwtColorMap::Format\fPformat = \fCQwtColorMap::RGB\fP)

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, \fBQwtColorMap::Format\fPformat = \fCQwtColorMap::RGB\fP)

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

void QwtLinearColorMap::addColorStop (doublevalue, 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 \fBQwtDoubleInterval\fP &interval, doublevalue) const\fC [virtual]\fP

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.

QwtArray< double > QwtLinearColorMap::colorStops () const

Return all positions of color stops in increasing order

\fBQwtLinearColorMap::Mode\fP QwtLinearColorMap::mode () const

Returns:

Mode of the color map

See also:

setMode()

QRgb QwtLinearColorMap::rgb (const \fBQwtDoubleInterval\fP &interval, doublevalue) const\fC [virtual]\fP

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.

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 (\fBMode\fPmode)

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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