[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_DOUBLE_INTERVAL_H
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| 11 | #define QWT_DOUBLE_INTERVAL_H
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 |
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| 15 | /*!
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| 16 | \brief A class representing an interval
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| 17 |
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| 18 | The interval is represented by 2 doubles, the lower and the upper limit.
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| 19 | */
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| 20 |
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| 21 | class QWT_EXPORT QwtDoubleInterval
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| 22 | {
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| 23 | public:
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| 24 | /*!
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| 25 | Flag indicating if a border is included/excluded from an interval
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| 26 |
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| 27 | - IncludeBorders\n
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| 28 | min/max values are inside the interval
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| 29 | - ExcludeMinimum\n
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| 30 | min value is not included in the interval
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| 31 | - ExcludeMaximum\n
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| 32 | max value is not included in the interval
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| 33 | - ExcludeBorders\n
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| 34 | min/max values are not included in the interval
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| 35 |
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| 36 | \sa setBorderMode(), testBorderMode()
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| 37 | */
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| 38 | enum BorderMode
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| 39 | {
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| 40 | IncludeBorders = 0,
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| 41 |
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| 42 | ExcludeMinimum = 1,
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| 43 | ExcludeMaximum = 2,
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| 44 |
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| 45 | ExcludeBorders = ExcludeMinimum | ExcludeMaximum
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| 46 | };
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| 47 |
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| 48 | QwtDoubleInterval();
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| 49 | QwtDoubleInterval(double minValue, double maxValue,
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| 50 | int borderFlags = IncludeBorders);
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| 51 |
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| 52 | void setInterval(double minValue, double maxValue,
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| 53 | int borderFlags = IncludeBorders);
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| 54 |
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| 55 | QwtDoubleInterval normalized() const;
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| 56 | QwtDoubleInterval inverted() const;
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| 57 | QwtDoubleInterval limited(double minValue, double maxValue) const;
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| 58 |
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| 59 | int operator==(const QwtDoubleInterval &) const;
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| 60 | int operator!=(const QwtDoubleInterval &) const;
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| 61 |
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| 62 | void setBorderFlags(int);
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| 63 | int borderFlags() const;
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| 64 |
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| 65 | double minValue() const;
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| 66 | double maxValue() const;
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| 67 |
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| 68 | double width() const;
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| 69 |
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| 70 | void setMinValue(double);
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| 71 | void setMaxValue(double);
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| 72 |
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| 73 | bool contains(double value) const;
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| 74 |
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| 75 | bool intersects(const QwtDoubleInterval &) const;
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| 76 | QwtDoubleInterval intersect(const QwtDoubleInterval &) const;
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| 77 | QwtDoubleInterval unite(const QwtDoubleInterval &) const;
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| 78 |
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| 79 | QwtDoubleInterval operator|(const QwtDoubleInterval &) const;
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| 80 | QwtDoubleInterval operator&(const QwtDoubleInterval &) const;
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| 81 |
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| 82 | QwtDoubleInterval &operator|=(const QwtDoubleInterval &);
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| 83 | QwtDoubleInterval &operator&=(const QwtDoubleInterval &);
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| 84 |
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| 85 | QwtDoubleInterval extend(double value) const;
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| 86 | QwtDoubleInterval operator|(double) const;
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| 87 | QwtDoubleInterval &operator|=(double);
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| 88 |
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| 89 | bool isValid() const;
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| 90 | bool isNull() const;
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| 91 | void invalidate();
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| 92 |
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| 93 | QwtDoubleInterval symmetrize(double value) const;
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| 94 |
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| 95 | private:
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| 96 | double d_minValue;
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| 97 | double d_maxValue;
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| 98 | int d_borderFlags;
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| 99 | };
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| 100 |
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| 101 | /*!
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| 102 | \brief Default Constructor
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| 103 |
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| 104 | Creates an invalid interval [0.0, -1.0]
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| 105 | \sa setInterval(), isValid()
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| 106 | */
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| 107 | inline QwtDoubleInterval::QwtDoubleInterval():
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| 108 | d_minValue(0.0),
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| 109 | d_maxValue(-1.0),
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| 110 | d_borderFlags(IncludeBorders)
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| 111 | {
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| 112 | }
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| 113 |
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| 114 | /*!
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| 115 | Constructor
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| 116 |
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| 117 | Build an interval with from min/max values
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| 118 |
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| 119 | \param minValue Minimum value
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| 120 | \param maxValue Maximum value
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| 121 | \param borderFlags Include/Exclude borders
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| 122 | */
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| 123 | inline QwtDoubleInterval::QwtDoubleInterval(
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| 124 | double minValue, double maxValue, int borderFlags):
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| 125 | d_minValue(minValue),
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| 126 | d_maxValue(maxValue),
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| 127 | d_borderFlags(borderFlags)
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| 128 | {
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| 129 | }
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| 130 |
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| 131 | /*!
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| 132 | Assign the limits of the interval
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| 133 |
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| 134 | \param minValue Minimum value
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| 135 | \param maxValue Maximum value
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| 136 | \param borderFlags Include/Exclude borders
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| 137 | */
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| 138 | inline void QwtDoubleInterval::setInterval(
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| 139 | double minValue, double maxValue, int borderFlags)
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| 140 | {
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| 141 | d_minValue = minValue;
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| 142 | d_maxValue = maxValue;
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| 143 | d_borderFlags = borderFlags;
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| 144 | }
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| 145 |
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| 146 | /*!
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| 147 | Change the border flags
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| 148 |
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| 149 | \param borderFlags Or'd BorderMode flags
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| 150 | \sa borderFlags()
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| 151 | */
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| 152 | inline void QwtDoubleInterval::setBorderFlags(int borderFlags)
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| 153 | {
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| 154 | d_borderFlags = borderFlags;
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| 155 | }
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| 156 |
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| 157 | /*!
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| 158 | \return Border flags
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| 159 | \sa setBorderFlags()
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| 160 | */
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| 161 | inline int QwtDoubleInterval::borderFlags() const
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| 162 | {
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| 163 | return d_borderFlags;
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| 164 | }
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| 165 |
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| 166 | /*!
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| 167 | Assign the lower limit of the interval
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| 168 |
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| 169 | \param minValue Minimum value
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| 170 | */
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| 171 | inline void QwtDoubleInterval::setMinValue(double minValue)
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| 172 | {
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| 173 | d_minValue = minValue;
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| 174 | }
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| 175 |
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| 176 | /*!
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| 177 | Assign the upper limit of the interval
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| 178 |
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| 179 | \param maxValue Maximum value
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| 180 | */
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| 181 | inline void QwtDoubleInterval::setMaxValue(double maxValue)
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| 182 | {
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| 183 | d_maxValue = maxValue;
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| 184 | }
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| 185 |
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| 186 | //! \return Lower limit of the interval
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| 187 | inline double QwtDoubleInterval::minValue() const
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| 188 | {
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| 189 | return d_minValue;
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| 190 | }
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| 191 |
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| 192 | //! \return Upper limit of the interval
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| 193 | inline double QwtDoubleInterval::maxValue() const
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| 194 | {
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| 195 | return d_maxValue;
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| 196 | }
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| 197 |
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| 198 | /*!
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| 199 | Return the width of an interval
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| 200 | The width of invalid intervals is 0.0, otherwise the result is
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| 201 | maxValue() - minValue().
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| 202 |
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| 203 | \sa isValid()
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| 204 | */
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| 205 | inline double QwtDoubleInterval::width() const
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| 206 | {
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| 207 | return isValid() ? (d_maxValue - d_minValue) : 0.0;
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| 208 | }
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| 209 |
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| 210 | /*!
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| 211 | Intersection of two intervals
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| 212 | \sa intersect()
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| 213 | */
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| 214 | inline QwtDoubleInterval QwtDoubleInterval::operator&(
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| 215 | const QwtDoubleInterval &interval ) const
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| 216 | {
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| 217 | return intersect(interval);
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| 218 | }
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| 219 |
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| 220 | /*!
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| 221 | Union of two intervals
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| 222 | \sa unite()
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| 223 | */
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| 224 | inline QwtDoubleInterval QwtDoubleInterval::operator|(
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| 225 | const QwtDoubleInterval &interval) const
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| 226 | {
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| 227 | return unite(interval);
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| 228 | }
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| 229 |
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| 230 | //! Compare two intervals
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| 231 | inline int QwtDoubleInterval::operator==(const QwtDoubleInterval &other) const
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| 232 | {
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| 233 | return (d_minValue == other.d_minValue) &&
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| 234 | (d_maxValue == other.d_maxValue) &&
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| 235 | (d_borderFlags == other.d_borderFlags);
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| 236 | }
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| 237 |
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| 238 | //! Compare two intervals
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| 239 | inline int QwtDoubleInterval::operator!=(const QwtDoubleInterval &other) const
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| 240 | {
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| 241 | return (!(*this == other));
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| 242 | }
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| 243 |
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| 244 | /*!
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| 245 | Extend an interval
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| 246 | \sa extend()
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| 247 | */
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| 248 | inline QwtDoubleInterval QwtDoubleInterval::operator|(double value) const
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| 249 | {
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| 250 | return extend(value);
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| 251 | }
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| 252 |
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| 253 | //! \return true, if isValid() && (minValue() >= maxValue())
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| 254 | inline bool QwtDoubleInterval::isNull() const
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| 255 | {
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| 256 | return isValid() && d_minValue >= d_maxValue;
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| 257 | }
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| 258 |
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| 259 | /*!
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| 260 | A interval is valid when minValue() <= maxValue().
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| 261 | In case of QwtDoubleInterval::ExcludeBorders it is true
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| 262 | when minValue() < maxValue()
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| 263 | */
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| 264 | inline bool QwtDoubleInterval::isValid() const
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| 265 | {
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| 266 | if ( (d_borderFlags & ExcludeBorders) == 0 )
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| 267 | return d_minValue <= d_maxValue;
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| 268 | else
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| 269 | return d_minValue < d_maxValue;
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| 270 | }
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| 271 |
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| 272 | /*!
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| 273 | Invalidate the interval
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| 274 |
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| 275 | The limits are set to interval [0.0, -1.0]
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| 276 | \sa isValid()
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| 277 | */
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| 278 | inline void QwtDoubleInterval::invalidate()
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| 279 | {
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| 280 | d_minValue = 0.0;
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| 281 | d_maxValue = -1.0;
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| 282 | }
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| 283 |
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| 284 | #endif
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