QwtAlphaColorMap Class Reference

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

#include <qwt_colormap.h>

Inheritance diagram for QwtAlphaColorMap:

Classes
class	PrivateData

Public Member Functions
	QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
	Constructor.
void	setAlphaInterval (int alpha1, int alpha2)
	Set the interval for the alpha coordinate.
int	alpha1 () const
	Return first alpha coordinate.
int	alpha2 () const
	Return second alpha coordinate.
void	setColor (const QColor &)
	Set the color.
QColor	color () const
	Return the color.
virtual QRgb	rgb (double vMin, double vMax, double value) const 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, double vMin, double vMax, double value) const
	Map a value of a given interval into a color index.
QColor	color (double vMin, double vMax, double value) const
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

[in]

color

Color of the map.

See also

setColor(), setAlphaInterval()

Member Function Documentation

alpha1()

int QwtAlphaColorMap::alpha1

(

)

const

Return first alpha coordinate.

Returns

First alpha coordinate.

See also

setAlphaInterval()

alpha2()

int QwtAlphaColorMap::alpha2

(

)

const

Return second alpha coordinate.

Returns

Second alpha coordinate.

See also

setAlphaInterval()

color()

QColor QwtAlphaColorMap::color

(

)

const

Return the color.

Returns

The color.

See also

setColor()

rgb()

QRgb QwtAlphaColorMap::rgb ( double  vMin, double  vMax, double  value  ) const

overridevirtual

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

Parameters

[in]	vMin	Minimum of the value interval.
[in]	vMax	Maximum of the value interval.
[in]	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

[in]	alpha1	First alpha coordinate.
[in]	alpha2	Second alpha coordinate.

See also

alpha1(), alpha2()

setColor()

void QwtAlphaColorMap::setColor

(

const QColor &

color

)

Set the color.

Parameters

[in]

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/core/qwt_colormap.h
• /home/runner/work/QWT/QWT/src/core/qwt_colormap.cpp