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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43 | //! The map is intended to map into RGB values.
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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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59 | Map a value of a given interval into a RGB value.
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60 |
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61 | \param interval Range for the values
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62 | \param value Value
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63 | \return RGB value, corresponding to value
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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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70 |
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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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140 | \brief QwtAlphaColorMap varies the alpha value of a color
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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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182 | return QColor::fromRgba( rgb( interval, value ) );
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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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