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_SCALE_MAP_H
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11 | #define QWT_SCALE_MAP_H
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12 |
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13 | #include "qwt_global.h"
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14 | #include "qwt_math.h"
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15 |
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16 | /*!
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17 | \brief Operations for linear or logarithmic (base 10) transformations
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18 | */
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19 | class QWT_EXPORT QwtScaleTransformation
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20 | {
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21 | public:
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22 | enum Type
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23 | {
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24 | Linear,
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25 | Log10,
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26 |
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27 | Other
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28 | };
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29 |
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30 | QwtScaleTransformation(Type type);
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31 | virtual ~QwtScaleTransformation();
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32 |
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33 | virtual double xForm(double x, double s1, double s2,
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34 | double p1, double p2) const;
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35 | virtual double invXForm(double x, double s1, double s2,
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36 | double p1, double p2) const;
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37 |
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38 | Type type() const;
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39 |
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40 | virtual QwtScaleTransformation *copy() const;
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41 |
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42 | private:
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43 | QwtScaleTransformation();
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44 | QwtScaleTransformation &operator=( const QwtScaleTransformation);
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45 |
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46 | const Type d_type;
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47 | };
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48 |
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49 | //! \return Transformation type
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50 | inline QwtScaleTransformation::Type QwtScaleTransformation::type() const
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51 | {
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52 | return d_type;
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53 | }
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54 |
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55 | /*!
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56 | \brief A scale map
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57 |
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58 | QwtScaleMap offers transformations from a scale
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59 | into a paint interval and vice versa.
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60 | */
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61 | class QWT_EXPORT QwtScaleMap
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62 | {
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63 | public:
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64 | QwtScaleMap();
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65 | QwtScaleMap(const QwtScaleMap&);
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66 |
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67 | ~QwtScaleMap();
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68 |
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69 | QwtScaleMap &operator=(const QwtScaleMap &);
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70 |
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71 | void setTransformation(QwtScaleTransformation * );
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72 | const QwtScaleTransformation *transformation() const;
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73 |
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74 | void setPaintInterval(int p1, int p2);
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75 | void setPaintXInterval(double p1, double p2);
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76 | void setScaleInterval(double s1, double s2);
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77 |
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78 | int transform(double x) const;
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79 | double invTransform(double i) const;
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80 |
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81 | double xTransform(double x) const;
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82 |
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83 | double p1() const;
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84 | double p2() const;
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85 |
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86 | double s1() const;
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87 | double s2() const;
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88 |
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89 | double pDist() const;
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90 | double sDist() const;
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91 |
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92 | QT_STATIC_CONST double LogMin;
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93 | QT_STATIC_CONST double LogMax;
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94 |
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95 | private:
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96 | void newFactor();
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97 |
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98 | double d_s1, d_s2; // scale interval boundaries
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99 | double d_p1, d_p2; // paint device interval boundaries
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100 |
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101 | double d_cnv; // conversion factor
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102 |
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103 | QwtScaleTransformation *d_transformation;
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104 | };
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105 |
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106 | /*!
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107 | \return First border of the scale interval
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108 | */
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109 | inline double QwtScaleMap::s1() const
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110 | {
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111 | return d_s1;
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112 | }
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113 |
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114 | /*!
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115 | \return Second border of the scale interval
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116 | */
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117 | inline double QwtScaleMap::s2() const
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118 | {
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119 | return d_s2;
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120 | }
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121 |
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122 | /*!
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123 | \return First border of the paint interval
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124 | */
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125 | inline double QwtScaleMap::p1() const
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126 | {
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127 | return d_p1;
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128 | }
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129 |
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130 | /*!
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131 | \return Second border of the paint interval
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132 | */
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133 | inline double QwtScaleMap::p2() const
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134 | {
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135 | return d_p2;
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136 | }
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137 |
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138 | /*!
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139 | \return qwtAbs(p2() - p1())
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140 | */
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141 | inline double QwtScaleMap::pDist() const
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142 | {
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143 | return qwtAbs(d_p2 - d_p1);
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144 | }
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145 |
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146 | /*!
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147 | \return qwtAbs(s2() - s1())
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148 | */
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149 | inline double QwtScaleMap::sDist() const
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150 | {
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151 | return qwtAbs(d_s2 - d_s1);
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152 | }
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153 |
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154 | /*!
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155 | Transform a point related to the scale interval into an point
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156 | related to the interval of the paint device
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157 |
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158 | \param s Value relative to the coordinates of the scale
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159 | */
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160 | inline double QwtScaleMap::xTransform(double s) const
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161 | {
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162 | // try to inline code from QwtScaleTransformation
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163 |
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164 | if ( d_transformation->type() == QwtScaleTransformation::Linear )
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165 | return d_p1 + (s - d_s1) * d_cnv;
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166 |
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167 | if ( d_transformation->type() == QwtScaleTransformation::Log10 )
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168 | return d_p1 + log(s / d_s1) * d_cnv;
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169 |
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170 | return d_transformation->xForm(s, d_s1, d_s2, d_p1, d_p2 );
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171 | }
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172 |
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173 | /*!
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174 | Transform an paint device value into a value in the
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175 | interval of the scale.
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176 |
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177 | \param p Value relative to the coordinates of the paint device
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178 | \sa transform()
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179 | */
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180 | inline double QwtScaleMap::invTransform(double p) const
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181 | {
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182 | return d_transformation->invXForm(p, d_p1, d_p2, d_s1, d_s2 );
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183 | }
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184 |
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185 | /*!
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186 | Transform a point related to the scale interval into an point
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187 | related to the interval of the paint device and round it to
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188 | an integer. (In Qt <= 3.x paint devices are integer based. )
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189 |
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190 | \param s Value relative to the coordinates of the scale
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191 | \sa xTransform()
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192 | */
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193 | inline int QwtScaleMap::transform(double s) const
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194 | {
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195 | return qRound(xTransform(s));
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196 | }
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197 |
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198 | #endif
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