QwtAlphaColorMap - Man Page
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
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