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_ENGINE_H
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11 | #define QWT_SCALE_ENGINE_H
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12 |
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13 | #include "qwt_global.h"
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14 | #include "qwt_scale_div.h"
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15 | #include "qwt_double_interval.h"
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16 |
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17 | class QwtScaleTransformation;
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18 |
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19 | /*!
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20 | \brief Arithmetic including a tolerance
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21 | */
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22 | class QWT_EXPORT QwtScaleArithmetic
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23 | {
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24 | public:
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25 | static int compareEps(
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26 | double value1, double value2, double intervalSize);
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27 |
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28 | static double ceilEps(double value, double intervalSize);
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29 | static double floorEps(double value, double intervalSize);
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30 |
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31 | static double divideEps(double interval, double steps);
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32 |
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33 | static double ceil125(double x);
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34 | static double floor125(double x);
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35 | };
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36 |
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37 | /*!
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38 | \brief Base class for scale engines.
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39 |
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40 | A scale engine trys to find "reasonable" ranges and step sizes
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41 | for scales.
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42 |
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43 | The layout of the scale can be varied with setAttribute().
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44 |
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45 | Qwt offers implementations for logarithmic (log10)
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46 | and linear scales. Contributions for other types of scale engines
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47 | (date/time, log2 ... ) are welcome.
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48 | */
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49 |
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50 | class QWT_EXPORT QwtScaleEngine
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51 | {
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52 | public:
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53 | /*!
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54 | - IncludeReference\n
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55 | Build a scale which includes the reference() value.
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56 | - Symmetric\n
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57 | Build a scale which is symmetric to the reference() value.
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58 | - Floating\n
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59 | The endpoints of the scale are supposed to be equal the
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60 | outmost included values plus the specified margins (see setMargins()). If this attribute is *not* set, the endpoints of the scale will
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61 | be integer multiples of the step size.
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62 | - Inverted\n
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63 | Turn the scale upside down.
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64 |
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65 | \sa setAttribute(), testAttribute(), reference(),
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66 | lowerMargin(), upperMargin()
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67 | */
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68 |
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69 | enum Attribute
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70 | {
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71 | NoAttribute = 0,
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72 | IncludeReference = 1,
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73 | Symmetric = 2,
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74 | Floating = 4,
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75 | Inverted = 8
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76 | };
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77 |
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78 | explicit QwtScaleEngine();
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79 | virtual ~QwtScaleEngine();
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80 |
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81 | void setAttribute(Attribute, bool on = true);
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82 | bool testAttribute(Attribute) const;
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83 |
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84 | void setAttributes(int);
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85 | int attributes() const;
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86 |
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87 | void setReference(double reference);
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88 | double reference() const;
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89 |
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90 | void setMargins(double lower, double upper);
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91 | double lowerMargin() const;
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92 | double upperMargin() const;
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93 |
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94 | /*!
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95 | Align and divide an interval
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96 |
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97 | \param maxNumSteps Max. number of steps
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98 | \param x1 First limit of the interval (In/Out)
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99 | \param x2 Second limit of the interval (In/Out)
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100 | \param stepSize Step size (Return value)
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101 | */
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102 | virtual void autoScale(int maxNumSteps,
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103 | double &x1, double &x2, double &stepSize) const = 0;
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104 |
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105 | /*!
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106 | \brief Calculate a scale division
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107 |
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108 | \param x1 First interval limit
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109 | \param x2 Second interval limit
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110 | \param maxMajSteps Maximum for the number of major steps
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111 | \param maxMinSteps Maximum number of minor steps
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112 | \param stepSize Step size. If stepSize == 0.0, the scaleEngine
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113 | calculates one.
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114 | */
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115 | virtual QwtScaleDiv divideScale(double x1, double x2,
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116 | int maxMajSteps, int maxMinSteps,
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117 | double stepSize = 0.0) const = 0;
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118 |
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119 | //! \return a transformation
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120 | virtual QwtScaleTransformation *transformation() const = 0;
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121 |
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122 | protected:
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123 | bool contains(const QwtDoubleInterval &, double val) const;
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124 | QwtValueList strip(const QwtValueList&, const QwtDoubleInterval &) const;
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125 | double divideInterval(double interval, int numSteps) const;
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126 |
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127 | QwtDoubleInterval buildInterval(double v) const;
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128 |
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129 | private:
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130 | class PrivateData;
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131 | PrivateData *d_data;
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132 | };
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133 |
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134 | /*!
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135 | \brief A scale engine for linear scales
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136 |
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137 | The step size will fit into the pattern
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138 | \f$\left\{ 1,2,5\right\} \cdot 10^{n}\f$, where n is an integer.
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139 | */
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140 |
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141 | class QWT_EXPORT QwtLinearScaleEngine: public QwtScaleEngine
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142 | {
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143 | public:
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144 | virtual void autoScale(int maxSteps,
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145 | double &x1, double &x2, double &stepSize) const;
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146 |
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147 | virtual QwtScaleDiv divideScale(double x1, double x2,
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148 | int numMajorSteps, int numMinorSteps,
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149 | double stepSize = 0.0) const;
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150 |
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151 | virtual QwtScaleTransformation *transformation() const;
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152 |
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153 | protected:
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154 | QwtDoubleInterval align(const QwtDoubleInterval&,
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155 | double stepSize) const;
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156 |
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157 | private:
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158 | void buildTicks(
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159 | const QwtDoubleInterval &, double stepSize, int maxMinSteps,
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160 | QwtValueList ticks[QwtScaleDiv::NTickTypes]) const;
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161 |
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162 | void buildMinorTicks(
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163 | const QwtValueList& majorTicks,
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164 | int maxMinMark, double step,
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165 | QwtValueList &, QwtValueList &) const;
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166 |
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167 | QwtValueList buildMajorTicks(
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168 | const QwtDoubleInterval &interval, double stepSize) const;
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169 | };
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170 |
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171 | /*!
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172 | \brief A scale engine for logarithmic (base 10) scales
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173 |
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174 | The step size is measured in *decades*
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175 | and the major step size will be adjusted to fit the pattern
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176 | \f$\left\{ 1,2,3,5\right\} \cdot 10^{n}\f$, where n is a natural number
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177 | including zero.
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178 |
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179 | \warning the step size as well as the margins are measured in *decades*.
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180 | */
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181 |
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182 | class QWT_EXPORT QwtLog10ScaleEngine: public QwtScaleEngine
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183 | {
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184 | public:
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185 | virtual void autoScale(int maxSteps,
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186 | double &x1, double &x2, double &stepSize) const;
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187 |
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188 | virtual QwtScaleDiv divideScale(double x1, double x2,
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189 | int numMajorSteps, int numMinorSteps,
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190 | double stepSize = 0.0) const;
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191 |
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192 | virtual QwtScaleTransformation *transformation() const;
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193 |
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194 | protected:
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195 | QwtDoubleInterval log10(const QwtDoubleInterval&) const;
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196 | QwtDoubleInterval pow10(const QwtDoubleInterval&) const;
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197 |
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198 | private:
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199 | QwtDoubleInterval align(const QwtDoubleInterval&,
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200 | double stepSize) const;
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201 |
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202 | void buildTicks(
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203 | const QwtDoubleInterval &, double stepSize, int maxMinSteps,
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204 | QwtValueList ticks[QwtScaleDiv::NTickTypes]) const;
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205 |
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206 | QwtValueList buildMinorTicks(
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207 | const QwtValueList& majorTicks,
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208 | int maxMinMark, double step) const;
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209 |
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210 | QwtValueList buildMajorTicks(
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211 | const QwtDoubleInterval &interval, double stepSize) const;
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212 | };
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213 |
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214 | #endif
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