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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Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide