[4271] | 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef QWT_COLOR_MAP_H
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| 11 | #define QWT_COLOR_MAP_H
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 | #include "qwt_interval.h"
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| 15 | #include <qcolor.h>
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| 16 | #include <qvector.h>
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| 17 |
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| 18 | /*!
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| 19 | \brief QwtColorMap is used to map values into colors.
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| 20 |
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| 21 | For displaying 3D data on a 2D plane the 3rd dimension is often
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| 22 | displayed using colors, like f.e in a spectrogram.
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| 23 |
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| 24 | Each color map is optimized to return colors for only one of the
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| 25 | following image formats:
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| 26 |
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| 27 | - QImage::Format_Indexed8\n
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| 28 | - QImage::Format_ARGB32\n
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| 29 |
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| 30 | \sa QwtPlotSpectrogram, QwtScaleWidget
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| 31 | */
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| 32 |
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| 33 | class QWT_EXPORT QwtColorMap
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| 34 | {
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| 35 | public:
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| 36 | /*!
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| 37 | Format for color mapping
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| 38 | \sa rgb(), colorIndex(), colorTable()
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| 39 | */
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| 40 |
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| 41 | enum Format
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| 42 | {
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[8127] | 43 | //! The map is intended to map into RGB values.
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[4271] | 44 | RGB,
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| 45 |
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| 46 | /*!
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| 47 | The map is intended to map into 8 bit values, that
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| 48 | are indices into the color table.
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| 49 | */
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| 50 | Indexed
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| 51 | };
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| 52 |
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| 53 | QwtColorMap( Format = QwtColorMap::RGB );
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| 54 | virtual ~QwtColorMap();
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| 55 |
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| 56 | Format format() const;
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| 57 |
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| 58 | /*!
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[8127] | 59 | Map a value of a given interval into a RGB value.
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| 60 |
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[4271] | 61 | \param interval Range for the values
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| 62 | \param value Value
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[8127] | 63 | \return RGB value, corresponding to value
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[4271] | 64 | */
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| 65 | virtual QRgb rgb( const QwtInterval &interval,
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| 66 | double value ) const = 0;
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| 67 |
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| 68 | /*!
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| 69 | Map a value of a given interval into a color index
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[8127] | 70 |
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[4271] | 71 | \param interval Range for the values
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| 72 | \param value Value
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| 73 | \return color index, corresponding to value
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| 74 | */
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| 75 | virtual unsigned char colorIndex(
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| 76 | const QwtInterval &interval, double value ) const = 0;
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| 77 |
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| 78 | QColor color( const QwtInterval &, double value ) const;
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| 79 | virtual QVector<QRgb> colorTable( const QwtInterval & ) const;
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| 80 |
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| 81 | private:
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| 82 | Format d_format;
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| 83 | };
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| 84 |
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| 85 | /*!
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| 86 | \brief QwtLinearColorMap builds a color map from color stops.
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| 87 |
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| 88 | A color stop is a color at a specific position. The valid
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| 89 | range for the positions is [0.0, 1.0]. When mapping a value
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| 90 | into a color it is translated into this interval according to mode().
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| 91 | */
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| 92 | class QWT_EXPORT QwtLinearColorMap: public QwtColorMap
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| 93 | {
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| 94 | public:
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| 95 | /*!
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| 96 | Mode of color map
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| 97 | \sa setMode(), mode()
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| 98 | */
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| 99 | enum Mode
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| 100 | {
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| 101 | //! Return the color from the next lower color stop
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| 102 | FixedColors,
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| 103 |
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| 104 | //! Interpolating the colors of the adjacent stops.
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| 105 | ScaledColors
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| 106 | };
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| 107 |
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| 108 | QwtLinearColorMap( QwtColorMap::Format = QwtColorMap::RGB );
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| 109 | QwtLinearColorMap( const QColor &from, const QColor &to,
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| 110 | QwtColorMap::Format = QwtColorMap::RGB );
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| 111 |
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| 112 | virtual ~QwtLinearColorMap();
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| 113 |
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| 114 | void setMode( Mode );
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| 115 | Mode mode() const;
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| 116 |
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| 117 | void setColorInterval( const QColor &color1, const QColor &color2 );
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| 118 | void addColorStop( double value, const QColor& );
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| 119 | QVector<double> colorStops() const;
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| 120 |
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| 121 | QColor color1() const;
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| 122 | QColor color2() const;
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| 123 |
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| 124 | virtual QRgb rgb( const QwtInterval &, double value ) const;
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| 125 | virtual unsigned char colorIndex(
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| 126 | const QwtInterval &, double value ) const;
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| 127 |
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| 128 | class ColorStops;
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| 129 |
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| 130 | private:
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| 131 | // Disabled copy constructor and operator=
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| 132 | QwtLinearColorMap( const QwtLinearColorMap & );
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| 133 | QwtLinearColorMap &operator=( const QwtLinearColorMap & );
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| 134 |
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| 135 | class PrivateData;
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| 136 | PrivateData *d_data;
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| 137 | };
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| 138 |
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| 139 | /*!
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[8127] | 140 | \brief QwtAlphaColorMap varies the alpha value of a color
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[4271] | 141 | */
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| 142 | class QWT_EXPORT QwtAlphaColorMap: public QwtColorMap
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| 143 | {
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| 144 | public:
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| 145 | QwtAlphaColorMap( const QColor & = QColor( Qt::gray ) );
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| 146 | virtual ~QwtAlphaColorMap();
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| 147 |
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| 148 | void setColor( const QColor & );
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| 149 | QColor color() const;
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| 150 |
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| 151 | virtual QRgb rgb( const QwtInterval &, double value ) const;
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| 152 |
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| 153 | private:
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| 154 | QwtAlphaColorMap( const QwtAlphaColorMap & );
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| 155 | QwtAlphaColorMap &operator=( const QwtAlphaColorMap & );
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| 156 |
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| 157 | virtual unsigned char colorIndex(
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| 158 | const QwtInterval &, double value ) const;
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| 159 |
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| 160 | class PrivateData;
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| 161 | PrivateData *d_data;
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| 162 | };
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| 163 |
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| 164 |
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| 165 | /*!
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| 166 | Map a value into a color
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| 167 |
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| 168 | \param interval Valid interval for values
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| 169 | \param value Value
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| 170 |
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| 171 | \return Color corresponding to value
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| 172 |
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| 173 | \warning This method is slow for Indexed color maps. If it is
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| 174 | necessary to map many values, its better to get the
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| 175 | color table once and find the color using colorIndex().
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| 176 | */
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| 177 | inline QColor QwtColorMap::color(
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| 178 | const QwtInterval &interval, double value ) const
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| 179 | {
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| 180 | if ( d_format == RGB )
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| 181 | {
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[8127] | 182 | return QColor::fromRgba( rgb( interval, value ) );
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[4271] | 183 | }
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| 184 | else
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| 185 | {
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| 186 | const unsigned int index = colorIndex( interval, value );
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| 187 | return colorTable( interval )[index]; // slow
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| 188 | }
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| 189 | }
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| 190 |
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| 191 | /*!
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| 192 | \return Intended format of the color map
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| 193 | \sa Format
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| 194 | */
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| 195 | inline QwtColorMap::Format QwtColorMap::format() const
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| 196 | {
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| 197 | return d_format;
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| 198 | }
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| 199 |
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| 200 | #endif
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