QwtAlphaColorMap Class Reference

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

#include <qwt_color_map.h>

Inheritance diagram for QwtAlphaColorMap:

Public Member Functions
	QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
	Constructor.
virtual	~QwtAlphaColorMap ()
	Destructor.
void	setAlphaInterval (int alpha1, int alpha2)
int	alpha1 () const
int	alpha2 () const
void	setColor (const QColor &)
QColor	color () const
virtual QRgb	rgb (const QwtInterval &, 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)
virtual	~QwtColorMap ()
	Destructor.
void	setFormat (Format)
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
virtual QVector< QRgb >	colorTable (int numColors) const
virtual QVector< QRgb >	colorTable256 () const

Additional Inherited Members
Public Types inherited from QwtColorMap
enum	Format { RGB , Indexed }
Public Attributes inherited from QwtColorMap
Format	const

Detailed Description

QwtAlphaColorMap varies the alpha value of a color.

Definition at line 147 of file qwt_color_map.h.

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()

Definition at line 539 of file qwt_color_map.cpp.

~QwtAlphaColorMap()

QwtAlphaColorMap::~QwtAlphaColorMap ( )

virtual

Destructor.

Definition at line 547 of file qwt_color_map.cpp.

Member Function Documentation

alpha1()

int QwtAlphaColorMap::alpha1

(

)

const

Returns

First alpha coordinate

See also

setAlphaInterval()

Definition at line 600 of file qwt_color_map.cpp.

alpha2()

int QwtAlphaColorMap::alpha2

(

)

const

Returns

Second alpha coordinate

See also

setAlphaInterval()

Definition at line 609 of file qwt_color_map.cpp.

color()

QColor QwtAlphaColorMap::color

(

)

const

Returns

the color

See also

setColor()

Definition at line 571 of file qwt_color_map.cpp.

rgb()

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

overridevirtual

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.

Definition at line 622 of file qwt_color_map.cpp.

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()

Definition at line 587 of file qwt_color_map.cpp.

setColor()

void QwtAlphaColorMap::setColor

(

const QColor &

color

)

Set the color

Parameters

color

Color

See also

color()

Definition at line 558 of file qwt_color_map.cpp.