| QwtLinearColorMap(3) | Qwt User's Guide | QwtLinearColorMap(3) |
NAME¶
QwtLinearColorMap -
SYNOPSIS¶
#include <qwt_color_map.h>
Inherits QwtColorMap.
Public Types¶
enum Mode { FixedColors, ScaledColors }
Public Member Functions¶
QwtLinearColorMap
(QwtColorMap::Format=QwtColorMap::RGB)
QwtLinearColorMap (const QColor &from, const QColor &to,
QwtColorMap::Format=QwtColorMap::RGB)
QwtLinearColorMap (const QwtLinearColorMap &)
virtual ~QwtLinearColorMap ()
void addColorStop (double value, const QColor &)
QColor color1 () const
QColor color2 () const
virtual unsigned char colorIndex (const QwtDoubleInterval &,
double value) const
QwtArray< double > colorStops () const
virtual QwtColorMap * copy () const
Mode mode () const
QwtLinearColorMap & operator= (const
QwtLinearColorMap &)
virtual QRgb rgb (const QwtDoubleInterval &, double value)
const
void setColorInterval (const QColor &color1, const QColor
&color2)
void setMode (Mode)
Detailed Description¶
QwtLinearColorMap builds a color map from color stops.
A color stop is a color at a specific position. The valid range for the positions is [0.0, 1.0]. When mapping a value into a color it is translated into this interval. If mode() == FixedColors the color is calculated from the next lower color stop. If mode() == ScaledColors the color is calculated by interpolating the colors of the adjacent stops.
Member Enumeration Documentation¶
enum QwtLinearColorMap::Mode¶
Mode of color map
See also:
Constructor & Destructor Documentation¶
QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Formatformat = QwtColorMap::RGB)¶
Build a color map with two stops at 0.0 and 1.0. The color at 0.0 is Qt::blue, at 1.0 it is Qt::yellow.
Parameters:
QwtLinearColorMap::QwtLinearColorMap (const QColor &color1, const QColor &color2, QwtColorMap::Formatformat = QwtColorMap::RGB)¶
Build a color map with two stops at 0.0 and 1.0.
Parameters:
color2 Color used for the maximum value of the value interval
format Preferred format of the coor map
Member Function Documentation¶
void QwtLinearColorMap::addColorStop (doublevalue, const QColor &color)¶
Add a color stop
The value has to be in the range [0.0, 1.0]. F.e. a stop at position 17.0 for a range [10.0,20.0] must be passed as: (17.0 - 10.0) / (20.0 - 10.0)
Parameters:
color Color stop
QColor QwtLinearColorMap::color1 () const¶
Returns:
See also:
QColor QwtLinearColorMap::color2 () const¶
Returns:
See also:
unsigned char QwtLinearColorMap::colorIndex (const QwtDoubleInterval &interval, doublevalue) const [virtual]¶
Map a value of a given interval into a color index, between 0 and 255
Parameters:
value Value to map into a color index
Implements QwtColorMap.
QwtArray< double > QwtLinearColorMap::colorStops () const¶
Return all positions of color stops in increasing order
QwtLinearColorMap::Mode QwtLinearColorMap::mode () const¶
Returns:
See also:
QRgb QwtLinearColorMap::rgb (const QwtDoubleInterval &interval, doublevalue) const [virtual]¶
Map a value of a given interval into a rgb value
Parameters:
value Value to map into a rgb value
Implements QwtColorMap.
void QwtLinearColorMap::setColorInterval (const QColor &color1, const QColor &color2)¶
Set the color range
Add stops at 0.0 and 1.0.
Parameters:
color2 Color used for the maximum value of the value interval
See also:
void QwtLinearColorMap::setMode (Modemode)¶
Set the mode of the color map. FixedColors means the color is calculated from the next lower color stop. ScaledColors means the color is calculated by interpolating the colors of the adjacent stops.
See also:
Author¶
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| Tue Nov 20 2012 | Version 5.2.3 |