.TH "QwtColorMap" 3 "Mon Aug 1 2011" "Version 5.2.2" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtColorMap \- 
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\fBQwtColorMap\fP is used to map values into colors.  

.SH SYNOPSIS
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\fC#include <qwt_color_map.h>\fP
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Inherited by \fBQwtAlphaColorMap\fP, and \fBQwtLinearColorMap\fP.
.SS "Public Types"

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.RI "enum \fBFormat\fP { \fBRGB\fP, \fBIndexed\fP }"
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.SS "Public Member Functions"

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.RI "QColor \fBcolor\fP (const \fBQwtDoubleInterval\fP &, double value) const "
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.RI "virtual unsigned char \fBcolorIndex\fP (const \fBQwtDoubleInterval\fP &interval, double value) const =0"
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.RI "virtual QVector< QRgb > \fBcolorTable\fP (const \fBQwtDoubleInterval\fP &) const "
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.RI "virtual \fBQwtColorMap\fP * \fBcopy\fP () const =0"
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.RI "\fBFormat\fP \fBformat\fP () const "
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.RI "\fBQwtColorMap\fP (\fBFormat\fP=QwtColorMap::RGB)"
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.RI "virtual QRgb \fBrgb\fP (const \fBQwtDoubleInterval\fP &interval, double value) const =0"
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.RI "virtual \fB~QwtColorMap\fP ()"
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.SH "Detailed Description"
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\fBQwtColorMap\fP is used to map values into colors. 

For displaying 3D data on a 2D plane the 3rd dimension is often displayed using colors, like f.e in a spectrogram.
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Each color map is optimized to return colors for only one of the following image formats:
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.IP "\(bu" 2
QImage::Format_Indexed8
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.IP "\(bu" 2
QImage::Format_ARGB32
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\fBSee also:\fP
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\fBQwtPlotSpectrogram\fP, \fBQwtScaleWidget\fP 
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.SH "Member Enumeration Documentation"
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.SS "enum \fBQwtColorMap::Format\fP".IP "\(bu" 2
RGB
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 The map is intended to map into QRgb values.
.IP "\(bu" 2
Indexed
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 The map is intended to map into 8 bit values, that are indices into the color table.
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\fBSee also:\fP
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\fBrgb()\fP, \fBcolorIndex()\fP, \fBcolorTable()\fP 
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.SH "Constructor & Destructor Documentation"
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.SS "QwtColorMap::QwtColorMap (\fBFormat\fPformat = \fCQwtColorMap::RGB\fP)"
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Constructor. 
.SS "QwtColorMap::~QwtColorMap ()\fC [virtual]\fP"
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Destructor. 
.SH "Member Function Documentation"
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.SS "QColor QwtColorMap::color (const \fBQwtDoubleInterval\fP &interval, doublevalue) const\fC [inline]\fP"Map a value into a color
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\fBParameters:\fP
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\fIinterval\fP Valid interval for values 
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\fIvalue\fP Value
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\fBReturns:\fP
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Color corresponding to value
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\fBWarning:\fP
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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 \fBcolorIndex()\fP. 
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.SS "virtual unsigned char QwtColorMap::colorIndex (const \fBQwtDoubleInterval\fP &interval, doublevalue) const\fC [pure virtual]\fP"Map a value of a given interval into a color index 
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\fBParameters:\fP
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\fIinterval\fP Range for the values 
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\fIvalue\fP Value 
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\fBReturns:\fP
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color index, corresponding to value 
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Implemented in \fBQwtLinearColorMap\fP.
.SS "QwtColorTable QwtColorMap::colorTable (const \fBQwtDoubleInterval\fP &interval) const\fC [virtual]\fP"Build and return a color map of 256 colors
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The color table is needed for rendering indexed images in combination with using \fBcolorIndex()\fP.
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\fBParameters:\fP
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\fIinterval\fP Range for the values 
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\fBReturns:\fP
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A color table, that can be used for a QImage 
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.SS "virtual \fBQwtColorMap\fP* QwtColorMap::copy () const\fC [pure virtual]\fP"
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Clone the color map. 
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Implemented in \fBQwtLinearColorMap\fP, and \fBQwtAlphaColorMap\fP.
.SS "\fBQwtColorMap::Format\fP QwtColorMap::format () const\fC [inline]\fP"\fBReturns:\fP
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Intended format of the color map 
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\fBSee also:\fP
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\fBFormat\fP 
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.SS "virtual QRgb QwtColorMap::rgb (const \fBQwtDoubleInterval\fP &interval, doublevalue) const\fC [pure virtual]\fP"Map a value of a given interval into a rgb value. 
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\fBParameters:\fP
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\fIinterval\fP Range for the values 
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\fIvalue\fP Value 
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\fBReturns:\fP
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rgb value, corresponding to value 
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Implemented in \fBQwtLinearColorMap\fP, and \fBQwtAlphaColorMap\fP.

.SH "Author"
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