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 <qglobal.h>
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14 | #include <qcolor.h>
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15 | #if QT_VERSION < 0x040000
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16 | #include <qvaluevector.h>
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17 | #else
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18 | #include <qvector.h>
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19 | #endif
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20 | #include "qwt_array.h"
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21 | #include "qwt_double_interval.h"
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22 |
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23 | #if defined(QWT_TEMPLATEDLL)
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24 | // MOC_SKIP_BEGIN
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25 | template class QWT_EXPORT QwtArray<double>;
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26 | // MOC_SKIP_END
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27 | #endif
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28 |
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29 | /*!
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30 | \brief QwtColorMap is used to map values into colors.
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31 |
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32 | For displaying 3D data on a 2D plane the 3rd dimension is often
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33 | displayed using colors, like f.e in a spectrogram.
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34 |
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35 | Each color map is optimized to return colors for only one of the
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36 | following image formats:
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37 |
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38 | - QImage::Format_Indexed8\n
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39 | - QImage::Format_ARGB32\n
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40 |
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41 | \sa QwtPlotSpectrogram, QwtScaleWidget
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42 | */
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43 |
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44 | class QWT_EXPORT QwtColorMap
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45 | {
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46 | public:
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47 | /*!
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48 | - RGB\n
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49 | The map is intended to map into QRgb values.
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50 | - Indexed\n
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51 | The map is intended to map into 8 bit values, that
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52 | are indices into the color table.
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53 |
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54 | \sa rgb(), colorIndex(), colorTable()
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55 | */
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56 |
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57 | enum Format
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58 | {
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59 | RGB,
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60 | Indexed
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61 | };
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62 |
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63 | QwtColorMap(Format = QwtColorMap::RGB );
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64 | virtual ~QwtColorMap();
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65 |
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66 | Format format() const;
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67 |
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68 | //! Clone the color map
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69 | virtual QwtColorMap *copy() const = 0;
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70 |
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71 | /*!
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72 | Map a value of a given interval into a rgb value.
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73 | \param interval Range for the values
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74 | \param value Value
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75 | \return rgb value, corresponding to value
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76 | */
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77 | virtual QRgb rgb(
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78 | const QwtDoubleInterval &interval, double value) const = 0;
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79 |
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80 | /*!
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81 | Map a value of a given interval into a color index
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82 | \param interval Range for the values
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83 | \param value Value
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84 | \return color index, corresponding to value
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85 | */
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86 | virtual unsigned char colorIndex(
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87 | const QwtDoubleInterval &interval, double value) const = 0;
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88 |
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89 | QColor color(const QwtDoubleInterval &, double value) const;
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90 | #if QT_VERSION < 0x040000
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91 | virtual QValueVector<QRgb> colorTable(const QwtDoubleInterval &) const;
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92 | #else
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93 | virtual QVector<QRgb> colorTable(const QwtDoubleInterval &) const;
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94 | #endif
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95 |
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96 | private:
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97 | Format d_format;
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98 | };
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99 |
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100 |
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101 | /*!
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102 | \brief QwtLinearColorMap builds a color map from color stops.
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103 |
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104 | A color stop is a color at a specific position. The valid
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105 | range for the positions is [0.0, 1.0]. When mapping a value
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106 | into a color it is translated into this interval. If
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107 | mode() == FixedColors the color is calculated from the next lower
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108 | color stop. If mode() == ScaledColors the color is calculated
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109 | by interpolating the colors of the adjacent stops.
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110 | */
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111 | class QWT_EXPORT QwtLinearColorMap: public QwtColorMap
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112 | {
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113 | public:
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114 | /*!
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115 | Mode of color map
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116 | \sa setMode(), mode()
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117 | */
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118 | enum Mode
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119 | {
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120 | FixedColors,
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121 | ScaledColors
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122 | };
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123 |
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124 | QwtLinearColorMap(QwtColorMap::Format = QwtColorMap::RGB);
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125 | QwtLinearColorMap( const QColor &from, const QColor &to,
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126 | QwtColorMap::Format = QwtColorMap::RGB);
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127 |
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128 | QwtLinearColorMap(const QwtLinearColorMap &);
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129 |
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130 | virtual ~QwtLinearColorMap();
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131 |
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132 | QwtLinearColorMap &operator=(const QwtLinearColorMap &);
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133 |
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134 | virtual QwtColorMap *copy() const;
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135 |
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136 | void setMode(Mode);
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137 | Mode mode() const;
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138 |
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139 | void setColorInterval(const QColor &color1, const QColor &color2);
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140 | void addColorStop(double value, const QColor&);
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141 | QwtArray<double> colorStops() const;
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142 |
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143 | QColor color1() const;
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144 | QColor color2() const;
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145 |
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146 | virtual QRgb rgb(const QwtDoubleInterval &, double value) const;
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147 | virtual unsigned char colorIndex(
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148 | const QwtDoubleInterval &, double value) const;
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149 |
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150 | class ColorStops;
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151 |
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152 | private:
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153 | class PrivateData;
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154 | PrivateData *d_data;
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155 | };
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156 |
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157 | /*!
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158 | \brief QwtAlphaColorMap variies the alpha value of a color
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159 | */
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160 | class QWT_EXPORT QwtAlphaColorMap: public QwtColorMap
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161 | {
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162 | public:
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163 | QwtAlphaColorMap(const QColor & = QColor(Qt::gray));
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164 | QwtAlphaColorMap(const QwtAlphaColorMap &);
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165 |
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166 | virtual ~QwtAlphaColorMap();
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167 |
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168 | QwtAlphaColorMap &operator=(const QwtAlphaColorMap &);
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169 |
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170 | virtual QwtColorMap *copy() const;
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171 |
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172 | void setColor(const QColor &);
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173 | QColor color() const;
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174 |
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175 | virtual QRgb rgb(const QwtDoubleInterval &, double value) const;
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176 |
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177 | private:
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178 | virtual unsigned char colorIndex(
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179 | const QwtDoubleInterval &, double value) const;
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180 |
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181 | class PrivateData;
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182 | PrivateData *d_data;
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183 | };
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184 |
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185 |
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186 | /*!
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187 | Map a value into a color
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188 |
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189 | \param interval Valid interval for values
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190 | \param value Value
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191 |
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192 | \return Color corresponding to value
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193 |
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194 | \warning This method is slow for Indexed color maps. If it is
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195 | necessary to map many values, its better to get the
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196 | color table once and find the color using colorIndex().
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197 | */
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198 | inline QColor QwtColorMap::color(
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199 | const QwtDoubleInterval &interval, double value) const
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200 | {
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201 | if ( d_format == RGB )
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202 | {
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203 | return QColor( rgb(interval, value) );
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204 | }
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205 | else
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206 | {
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207 | const unsigned int index = colorIndex(interval, value);
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208 | return colorTable(interval)[index]; // slow
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209 | }
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210 | }
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211 |
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212 | /*!
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213 | \return Intended format of the color map
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214 | \sa Format
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215 | */
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216 | inline QwtColorMap::Format QwtColorMap::format() const
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217 | {
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218 | return d_format;
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219 | }
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220 |
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221 | #endif
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