[89] | 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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