Qwt User's Guide
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))
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.

Detailed Description

QwtAlphaColorMap varies the alpha value of a color.


Constructor & Destructor Documentation

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

Constructor

Parameters:
colorColor 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:
intervalRange for all values
valueValue 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:
colorColor
See also:
color()

List of all members.

 All Classes Functions Variables Typedefs Enumerations Enumerator