QwtAlphaColorMap Class Reference

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

#include <qwt_color_map.h>

Inheritance diagram for QwtAlphaColorMap:
Inheritance graph
[legend]

List of all members.

Public Member Functions

 QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
virtual ~QwtAlphaColorMap ()
void setColor (const QColor &)
QColor color () const
virtual QRgb rgb (const QwtInterval &, double value) const

Detailed Description

QwtAlphaColorMap variies the alpha value of a color.


Constructor & Destructor Documentation

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

Constructor

Parameters:
color Color of the map
QwtAlphaColorMap::~QwtAlphaColorMap (  )  [virtual]

Destructor.


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()
Generated on Sun Nov 21 12:01:29 2010 for Qwt User's Guide by  doxygen 1.6.3