QwtAlphaColorMap - Man Page
QwtAlphaColorMap varies the alpha value of a color.
Synopsis
#include <qwt_color_map.h>
Inherits QwtColorMap.
Public Member Functions
QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
Constructor.
virtual ~QwtAlphaColorMap ()
Destructor.
void setAlphaInterval (int alpha1, int alpha2)
int alpha1 () const
int alpha2 () const
void setColor (const QColor &)
QColor color () const
virtual QRgb rgb (const QwtInterval &, double value) const override
Map a value of a given interval into a alpha value.
Additional Inherited Members
Detailed Description
QwtAlphaColorMap varies the alpha value of a color.
Definition at line 147 of file qwt_color_map.h.
Constructor & Destructor Documentation
QwtAlphaColorMap::QwtAlphaColorMap (const QColor & color = QColor( Qt::gray )) [explicit]
Constructor. The alpha interval is initialized by 0 to 255.
- Parameters
color Color of the map
- See also
setColor(), setAlphaInterval()
Definition at line 539 of file qwt_color_map.cpp.
Member Function Documentation
int QwtAlphaColorMap::alpha1 () const
- Returns
First alpha coordinate
- See also
setAlphaInterval()
Definition at line 600 of file qwt_color_map.cpp.
int QwtAlphaColorMap::alpha2 () const
- Returns
Second alpha coordinate
- See also
setAlphaInterval()
Definition at line 609 of file qwt_color_map.cpp.
QColor QwtAlphaColorMap::color () const
- Returns
the color
- See also
setColor()
Definition at line 571 of file qwt_color_map.cpp.
QRgb QwtAlphaColorMap::rgb (const QwtInterval & interval, double value) const [override], [virtual]
Map a value of a given interval into a alpha value.
- Parameters
interval Range for all values
value Value to map into a RGB value- Returns
RGB value, with an alpha value
Implements QwtColorMap.
Definition at line 622 of file qwt_color_map.cpp.
void QwtAlphaColorMap::setAlphaInterval (int alpha1, int alpha2)
Set the interval for the alpha coordinate
alpha1/alpha2 need to be in the range 0 to 255, where 255 means opaque and 0 means transparent.
- Parameters
alpha1 First alpha coordinate
alpha2 Second alpha coordinate- See also
alpha1(), alpha2()
Definition at line 587 of file qwt_color_map.cpp.
void QwtAlphaColorMap::setColor (const QColor & color)
Set the color
- Parameters
color Color
- See also
color()
Definition at line 558 of file qwt_color_map.cpp.
Author
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