QwtLinearColorMap Class Reference

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

#include <qwt_color_map.h>

Inheritance diagram for QwtLinearColorMap:

Public Types
enum	Mode { FixedColors , ScaledColors }
Public Types inherited from QwtColorMap
enum	Format { RGB , Indexed }

Public Member Functions
	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. More...
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. More...
Public Member Functions inherited from QwtColorMap
	QwtColorMap (Format=QwtColorMap::RGB)
virtual	~QwtColorMap ()
	Destructor.
void	setFormat (Format)
QColor	color (const QwtInterval &, double value) const
virtual QVector< QRgb >	colorTable (int numColors) const
virtual QVector< QRgb >	colorTable256 () const

Additional Inherited Members
Public Attributes inherited from QwtColorMap
Format	const

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().

Definition at line 98 of file qwt_color_map.h.

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.

Definition at line 105 of file qwt_color_map.h.

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

Definition at line 351 of file qwt_color_map.cpp.

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

Definition at line 367 of file qwt_color_map.cpp.

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

Definition at line 433 of file qwt_color_map.cpp.

color1()

QColor QwtLinearColorMap::color1

(

)

const

Returns

the first color of the color range

See also

setColorInterval()

Definition at line 451 of file qwt_color_map.cpp.

color2()

QColor QwtLinearColorMap::color2

(

)

const

Returns

the second color of the color range

See also

setColorInterval()

Definition at line 460 of file qwt_color_map.cpp.

colorIndex()

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

overridevirtual

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.

colorStops()

QVector< double > QwtLinearColorMap::colorStops

(

)

const

Returns

Positions of color stops in increasing order

Definition at line 442 of file qwt_color_map.cpp.

mode()

QwtLinearColorMap::Mode QwtLinearColorMap::mode

(

)

const

Returns

Mode of the color map

See also

setMode()

Definition at line 400 of file qwt_color_map.cpp.

rgb()

QRgb QwtLinearColorMap::rgb ( const QwtInterval &  interval, double  value  ) const

overridevirtual

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.

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()

Definition at line 415 of file qwt_color_map.cpp.

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()

Definition at line 391 of file qwt_color_map.cpp.