QwtAlphaColorMap(3) Qwt User's Guide QwtAlphaColorMap(3)NAMEQwtAlphaColorMap-
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 DescriptionQwtAlphaColorMap 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
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Version 5.2.2 Mon Aug 1 2011 QwtAlphaColorMap(3)
