QwtAlphaColorMap Class Reference

QwtAlphaColorMap varies the alpha value of a color. More...

#include <qwt_color_map.h>

Inheritance diagram for QwtAlphaColorMap:

Classes
class	PrivateData

Public Member Functions
	QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
	Constructor.
virtual	~QwtAlphaColorMap ()
	Destructor.
void	setAlphaInterval (int alpha1, int alpha2)
	Set the interval for the alpha coordinate.
int	alpha1 () const
int	alpha2 () const
void	setColor (const QColor &)
	Set the color.
QColor	color () const
virtual QRgb	rgb (const QwtInterval &, double value) const QWT_OVERRIDE
	Map a value of a given interval into a alpha value.
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
virtual uint	colorIndex (int numColors, const QwtInterval &interval, double value) const
	Map a value of a given interval into a color index.
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.

Additional Inherited Members
Public Types inherited from QwtColorMap
enum	Format { RGB , Indexed }
	Format for color mapping. More...

Detailed Description

QwtAlphaColorMap varies the alpha value of a color.

Constructor & Destructor Documentation

QwtAlphaColorMap()

QwtAlphaColorMap::QwtAlphaColorMap ( const QColor &  color = QColor(Qt::gray) )

explicit

Constructor.

The alpha interval is initialized by 0 to 255.

Parameters

color

Color of the map

See also

setColor(), setAlphaInterval()

Member Function Documentation

alpha1()

int QwtAlphaColorMap::alpha1

(

)

const

Returns

First alpha coordinate

See also

setAlphaInterval()

alpha2()

int QwtAlphaColorMap::alpha2

(

)

const

Returns

Second alpha coordinate

See also

setAlphaInterval()

color()

QColor QwtAlphaColorMap::color

(

)

const

Returns

the color

See also

setColor()

rgb()

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

virtual

Map a value of a given interval into a alpha value.

Parameters

interval	Range for all values
value	Value to map into a RGB value

Returns

RGB value, with an alpha value

Implements QwtColorMap.

setAlphaInterval()

void QwtAlphaColorMap::setAlphaInterval	(	int	alpha1,
		int	alpha2
	)

Set the interval for the alpha coordinate.

alpha1/alpha2 need to be in the range 0 to 255, where 255 means opaque and 0 means transparent.

Parameters

alpha1	First alpha coordinate
alpha2	Second alpha coordinate

See also

alpha1(), alpha2()

setColor()

void QwtAlphaColorMap::setColor

(

const QColor &

color

)

Set the color.

Parameters

color

Color

See also

color()

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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