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QwtAlphaColorMap(3) Qwt User's Guide QwtAlphaColorMap(3)

NAME

QwtAlphaColorMap -
QwtAlphaColorMap variies the alpha value of a color.
 

SYNOPSIS

#include <qwt_color_map.h>
Inherits QwtColorMap.

Public Types


enum Format { RGB, Indexed }
 

Public Member Functions


QColor color () const
 
QColor color (const QwtDoubleInterval &, double value) const
 
virtual QVector< QRgb > colorTable (const QwtDoubleInterval &) const
 
virtual QwtColorMap * copy () const
 
Format format () const
 
QwtAlphaColorMap & operator= (const QwtAlphaColorMap &)
 
QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
 
QwtAlphaColorMap (const QwtAlphaColorMap &)
 
virtual QRgb rgb (const QwtDoubleInterval &, double value) const
 
void setColor (const QColor &)
 
virtual ~QwtAlphaColorMap ()
 

Detailed Description

QwtAlphaColorMap variies the alpha value of a color.

Member Enumeration Documentation

enum QwtColorMap::Format [inherited] .IP • 2

RGB
 

The map is intended to map into QRgb values.
•
Indexed
 

The map is intended to map into 8 bit values, that are indices into the color table.
See also:
rgb(), colorIndex(), colorTable()
 

Constructor & Destructor Documentation

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

Parameters:
color Color of the map
 

QwtAlphaColorMap::QwtAlphaColorMap (const QwtAlphaColorMap &other) Copy constructor

Parameters:
other Other color map
 

QwtAlphaColorMap::~QwtAlphaColorMap () [virtual]

Destructor.

Member Function Documentation

QColor QwtAlphaColorMap::color () const Returns:

the color
See also:
setColor()
 

QColor QwtColorMap::color (const QwtDoubleInterval &interval, doublevalue) const [inline, inherited] Map a value into a color

Parameters:
interval Valid interval for values
 
value Value
Returns:
Color corresponding to value
Warning:
This method is slow for Indexed color maps. If it is necessary to map many values, its better to get the color table once and find the color using colorIndex().
 

QwtColorTable QwtColorMap::colorTable (const QwtDoubleInterval &interval) const [virtual, inherited] Build and return a color map of 256 colors

The color table is needed for rendering indexed images in combination with using colorIndex().
Parameters:
interval Range for the values
Returns:
A color table, that can be used for a QImage
 

QwtColorMap * QwtAlphaColorMap::copy () const [virtual]

Clone the color map.
Implements QwtColorMap.

QwtColorMap::Format QwtColorMap::format () const [inline, inherited] Returns:

Intended format of the color map
See also:
Format
 

QwtAlphaColorMap & QwtAlphaColorMap::operator= (const QwtAlphaColorMap &other) Assignment operator

Parameters:
other Other color map
Returns:
*this
 

QRgb QwtAlphaColorMap::rgb (const QwtDoubleInterval &interval, doublevalue) 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

Generated automatically by Doxygen for Qwt User's Guide from the source code.
Mon Aug 1 2011 Version 5.2.2