QwtLinearColorMap Class Reference

QwtLinearColorMap builds a color map from color stops. More...

#include <qwt_color_map.h>

Inheritance diagram for QwtLinearColorMap:

Classes
class	ColorStops
class	PrivateData

Public Types
enum	Mode { FixedColors , ScaledColors }
	Mode of color map. More...
Public Types inherited from QwtColorMap
enum	Format { RGB , Indexed }
	Format for color mapping. More...

Public Member Functions
	QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB)
	Build a color map with two stops at 0.0 and 1.0.
	QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB)
	Build a color map with two stops at 0.0 and 1.0.
virtual	~QwtLinearColorMap ()
	Destructor.
void	setMode (Mode)
	Set the mode of the color map.
Mode	mode () const
void	setColorInterval (const QColor &color1, const QColor &color2)
	Set the color range.
void	addColorStop (double value, const QColor &)
	Add a color stop.
QVector< double >	stopPos () const
QVector< QColor >	stopColors () const
	返回colorStops对应的color
QColor	color1 () const
QColor	color2 () const
virtual QRgb	rgb (const QwtInterval &, double value) const QWT_OVERRIDE
	Map a value of a given interval into a RGB value.
virtual uint	colorIndex (int numColors, const QwtInterval &, double value) const QWT_OVERRIDE
	Map a value of a given interval into a color index.
Public Member Functions inherited from QwtColorMap
	QwtColorMap (Format=QwtColorMap::RGB)
	Constructor.
virtual	~QwtColorMap ()
	Destructor.
void	setFormat (Format)
	Set the format of the color map.
Format	format () const
QColor	color (const QwtInterval &, double value) const
	Map a value into a color.
virtual QVector< QRgb >	colorTable (int numColors) const
	Build and return a color map of arbitrary number of colors.
virtual QVector< QRgb >	colorTable256 () const
	Build and return a color map of 256 colors.

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

Mode

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() [1/2]

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

QwtLinearColorMap() [2/2]

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

addColorStop()

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

color1()

QColor QwtLinearColorMap::color1

(

)

const

Returns

the first color of the color range

See also

setColorInterval()

color2()

QColor QwtLinearColorMap::color2

(

)

const

Returns

the second color of the color range

See also

setColorInterval()

colorIndex()

uint QwtLinearColorMap::colorIndex ( int  numColors, const QwtInterval &  interval, double  value  ) const

virtual

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.

mode()

QwtLinearColorMap::Mode QwtLinearColorMap::mode

(

)

const

Returns

Mode of the color map

See also

setMode()

rgb()

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.

setColorInterval()

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()

setMode()

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()

stopColors()

QVector< QColor > QwtLinearColorMap::stopColors

(

)

const

返回colorStops对应的color

Returns

stopPos()

QVector< double > QwtLinearColorMap::stopPos

(

)

const

Returns

Positions of color stops in increasing order

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The documentation for this class was generated from the following files:

• /home/runner/work/QWT/QWT/src/qwt_color_map.h
• /home/runner/work/QWT/QWT/src/qwt_color_map.cpp