Qwt User's Guide
6.0.1
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#include <qwt_color_map.h>
Public Types | |
enum | Format { RGB, Indexed } |
enum | Mode { FixedColors, ScaledColors } |
Public Member Functions | |
void | addColorStop (double value, const QColor &) |
QColor | color (const QwtInterval &, double value) const |
QColor | color1 () const |
QColor | color2 () const |
virtual unsigned char | colorIndex (const QwtInterval &, double value) const |
QVector< double > | colorStops () const |
virtual QVector< QRgb > | colorTable (const QwtInterval &) const |
Format | format () const |
Mode | mode () const |
QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB) | |
QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB) | |
virtual QRgb | rgb (const QwtInterval &, double value) const |
void | setColorInterval (const QColor &color1, const QColor &color2) |
void | setMode (Mode) |
virtual | ~QwtLinearColorMap () |
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 according to mode().
enum QwtColorMap::Format [inherited] |
Format for color mapping
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.
format | Preferred format of the color map |
QwtLinearColorMap::QwtLinearColorMap | ( | const QColor & | color1, |
const QColor & | color2, | ||
QwtColorMap::Format | format = QwtColorMap::RGB |
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) |
Build a color map with two stops at 0.0 and 1.0.
color1 | Color used for the minimum value of the value interval |
color2 | Color used for the maximum value of the value interval |
format | Preferred format of the coor map |
QwtLinearColorMap::~QwtLinearColorMap | ( | ) | [virtual] |
Destructor.
void QwtLinearColorMap::addColorStop | ( | double | value, |
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)
value | Value between [0.0, 1.0] |
color | Color stop |
QColor QwtColorMap::color | ( | const QwtInterval & | interval, |
double | value | ||
) | const [inline, inherited] |
Map a value into a color
interval | Valid interval for values |
value | Value |
QColor QwtLinearColorMap::color1 | ( | ) | const |
QColor QwtLinearColorMap::color2 | ( | ) | const |
unsigned char QwtLinearColorMap::colorIndex | ( | const QwtInterval & | interval, |
double | value | ||
) | const [virtual] |
Map a value of a given interval into a color index, between 0 and 255
interval | Range for all values |
value | Value to map into a color index |
Implements QwtColorMap.
QVector< double > QwtLinearColorMap::colorStops | ( | ) | const |
Return all positions of color stops in increasing order
QVector< QRgb > QwtColorMap::colorTable | ( | const QwtInterval & | 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().
interval | Range for the values |
QwtColorMap::Format QwtColorMap::format | ( | ) | const [inline, inherited] |
QRgb QwtLinearColorMap::rgb | ( | const QwtInterval & | interval, |
double | value | ||
) | const [virtual] |
Map a value of a given interval into a rgb value
interval | Range for all values |
value | Value to map into a rgb value |
Implements QwtColorMap.
void QwtLinearColorMap::setColorInterval | ( | const QColor & | color1, |
const QColor & | color2 | ||
) |
void QwtLinearColorMap::setMode | ( | Mode | mode | ) |
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.