QwtAlphaColorMap - Man Page

QwtAlphaColorMap varies the alpha value of a color.

Synopsis

#include <qwt_color_map.h>

Inherits QwtColorMap.

Public Member Functions

QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
virtual ~QwtAlphaColorMap ()
Destructor.
void setColor (const QColor &)
QColor color () const
virtual QRgb rgb (const QwtInterval &, double value) const
Map a value of a given interval into a alpha value.

Additional Inherited Members

Detailed Description

QwtAlphaColorMap varies the alpha value of a color.

Constructor & Destructor Documentation

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

Constructor

Parameters

color Color of the map

Member Function Documentation

QColor QwtAlphaColorMap::color () const

Returns

the color

See also

setColor()

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

Map a value of a given interval into a alpha value. alpha := (value - interval.minValue()) / interval.width();

Parameters

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

Returns

RGB value, with an alpha value

Implements QwtColorMap.

void QwtAlphaColorMap::setColor (const QColor & color)

Set the color

Parameters

color Color

See also

color()

Author

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Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide