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QwtLinearColorMap

QwtLinearColorMap

Section: C Library Functions (3) Updated: 22 Mar 2009
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NAME

QwtLinearColorMap - QwtLinearColorMap builds a color map from color stops.

 

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 ()

QwtLinearColorMap & operator= (const QwtLinearColorMap &)

virtual QwtColorMap * copy () const

void setMode (Mode)

Mode mode () const

void setColorInterval (const QColor &color1, const QColor &color2)

void addColorStop (double value, const QColor &)

QwtArray< double > colorStops () const

QColor color1 () const

QColor color2 () const

virtual QRgb rgb (const QwtDoubleInterval &, double value) const

virtual unsigned char colorIndex (const QwtDoubleInterval &, double value) const
 

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:

setMode(), mode()

 

Constructor & Destructor Documentation

 

QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Format format = 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:

format Preferred format of the color map

 

QwtLinearColorMap::QwtLinearColorMap (const QColor & color1, const QColor & color2, QwtColorMap::Format format = QwtColorMap::RGB)

Build a color map with two stops at 0.0 and 1.0.

Parameters:

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 (const QwtLinearColorMap & other)

Copy constructor.

 

QwtLinearColorMap::~QwtLinearColorMap () [virtual]

Destructor.

 

Member Function Documentation

 

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)

Parameters:

value Value between [0.0, 1.0]
color Color stop

 

QColor QwtLinearColorMap::color1 () const

Returns:

the first color of the color range

See also:

setColorInterval()

 

QColor QwtLinearColorMap::color2 () const

Returns:

the second color of the color range

See also:

setColorInterval()

 

unsigned char QwtLinearColorMap::colorIndex (const QwtDoubleInterval & interval, double value) const [virtual]

Map a value of a given interval into a color index, between 0 and 255

Parameters:

interval Range for all values
value Value to map into a color index

Implements QwtColorMap.  

QwtArray< double > QwtLinearColorMap::colorStops () const

Return all positions of color stops in increasing order  

QwtColorMap * QwtLinearColorMap::copy () const [virtual]

Clone the color map.

Implements QwtColorMap.  

QwtLinearColorMap::Mode QwtLinearColorMap::mode () const

Returns:

Mode of the color map

See also:

setMode()

 

QwtLinearColorMap & QwtLinearColorMap::operator= (const QwtLinearColorMap & other)

Assignment operator.

 

QRgb QwtLinearColorMap::rgb (const QwtDoubleInterval & interval, double value) const [virtual]

Map a value of a given interval into a rgb value

Parameters:

interval Range for all values
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:

color1 Color used for the minimum value of the value interval
color2 Color used for the maximum value of the value interval

See also:

color1(), 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.

See also:

mode()

 

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.


 

Index

NAME
SYNOPSIS
Public Types
Public Member Functions
Detailed Description
Member Enumeration Documentation
enum QwtLinearColorMap::Mode
Constructor & Destructor Documentation
QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Format format = QwtColorMap::RGB)
QwtLinearColorMap::QwtLinearColorMap (const QColor & color1, const QColor & color2, QwtColorMap::Format format = QwtColorMap::RGB)
QwtLinearColorMap::QwtLinearColorMap (const QwtLinearColorMap & other)
QwtLinearColorMap::~QwtLinearColorMap () [virtual]
Member Function Documentation
void QwtLinearColorMap::addColorStop (double value, const QColor & color)
QColor QwtLinearColorMap::color1 () const
QColor QwtLinearColorMap::color2 () const
unsigned char QwtLinearColorMap::colorIndex (const QwtDoubleInterval & interval, double value) const [virtual]
QwtArray< double > QwtLinearColorMap::colorStops () const
QwtColorMap * QwtLinearColorMap::copy () const [virtual]
QwtLinearColorMap::Mode QwtLinearColorMap::mode () const
QwtLinearColorMap & QwtLinearColorMap::operator= (const QwtLinearColorMap & other)
QRgb QwtLinearColorMap::rgb (const QwtDoubleInterval & interval, double value) const [virtual]
void QwtLinearColorMap::setColorInterval (const QColor & color1, const QColor & color2)
void QwtLinearColorMap::setMode (Mode mode)
Author

This document was created by man2html, using the manual pages.
Time: 21:53:52 GMT, April 16, 2011