Qwt User's Guide 5.2.3

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qwt_double_interval.h
1 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10 #ifndef QWT_DOUBLE_INTERVAL_H
11 #define QWT_DOUBLE_INTERVAL_H
12
13 #include "qwt_global.h"
14
21 class QWT_EXPORT QwtDoubleInterval
22 {
23 public:
38 enum BorderMode
39 {
40 IncludeBorders = 0,
41
42 ExcludeMinimum = 1,
43 ExcludeMaximum = 2,
44
45 ExcludeBorders = ExcludeMinimum | ExcludeMaximum
46 };
47
48 QwtDoubleInterval();
49 QwtDoubleInterval(double minValue, double maxValue,
50 int borderFlags = IncludeBorders);
51
52 void setInterval(double minValue, double maxValue,
53 int borderFlags = IncludeBorders);
54
55 QwtDoubleInterval normalized() const;
56 QwtDoubleInterval inverted() const;
57 QwtDoubleInterval limited(double minValue, double maxValue) const;
58
59 int operator==(const QwtDoubleInterval &) const;
60 int operator!=(const QwtDoubleInterval &) const;
61
62 void setBorderFlags(int);
63 int borderFlags() const;
64
65 double minValue() const;
66 double maxValue() const;
67
68 double width() const;
69
70 void setMinValue(double);
71 void setMaxValue(double);
72
73 bool contains(double value) const;
74
75 bool intersects(const QwtDoubleInterval &) const;
76 QwtDoubleInterval intersect(const QwtDoubleInterval &) const;
77 QwtDoubleInterval unite(const QwtDoubleInterval &) const;
78
79 QwtDoubleInterval operator|(const QwtDoubleInterval &) const;
80 QwtDoubleInterval operator&(const QwtDoubleInterval &) const;
81
82 QwtDoubleInterval &operator|=(const QwtDoubleInterval &);
83 QwtDoubleInterval &operator&=(const QwtDoubleInterval &);
84
85 QwtDoubleInterval extend(double value) const;
86 QwtDoubleInterval operator|(double) const;
87 QwtDoubleInterval &operator|=(double);
88
89 bool isValid() const;
90 bool isNull() const;
91 void invalidate();
92
93 QwtDoubleInterval symmetrize(double value) const;
94
95 private:
96 double d_minValue;
97 double d_maxValue;
98 int d_borderFlags;
99 };
100
107 inline QwtDoubleInterval::QwtDoubleInterval():
108 d_minValue(0.0),
109 d_maxValue(-1.0),
110 d_borderFlags(IncludeBorders)
111 {
112 }
113
123 inline QwtDoubleInterval::QwtDoubleInterval(
124 double minValue, double maxValue, int borderFlags):
125 d_minValue(minValue),
126 d_maxValue(maxValue),
127 d_borderFlags(borderFlags)
128 {
129 }
130
138 inline void QwtDoubleInterval::setInterval(
139 double minValue, double maxValue, int borderFlags)
140 {
141 d_minValue = minValue;
142 d_maxValue = maxValue;
143 d_borderFlags = borderFlags;
144 }
145
152 inline void QwtDoubleInterval::setBorderFlags(int borderFlags)
153 {
154 d_borderFlags = borderFlags;
155 }
156
161 inline int QwtDoubleInterval::borderFlags() const
162 {
163 return d_borderFlags;
164 }
165
171 inline void QwtDoubleInterval::setMinValue(double minValue)
172 {
173 d_minValue = minValue;
174 }
175
181 inline void QwtDoubleInterval::setMaxValue(double maxValue)
182 {
183 d_maxValue = maxValue;
184 }
185
187 inline double QwtDoubleInterval::minValue() const
188 {
189 return d_minValue;
190 }
191
193 inline double QwtDoubleInterval::maxValue() const
194 {
195 return d_maxValue;
196 }
197
205 inline double QwtDoubleInterval::width() const
206 {
207 return isValid() ? (d_maxValue - d_minValue) : 0.0;
208 }
209
214 inline QwtDoubleInterval QwtDoubleInterval::operator&(
215 const QwtDoubleInterval &interval ) const
216 {
217 return intersect(interval);
218 }
219
224 inline QwtDoubleInterval QwtDoubleInterval::operator|(
225 const QwtDoubleInterval &interval) const
226 {
227 return unite(interval);
228 }
229
231 inline int QwtDoubleInterval::operator==(const QwtDoubleInterval &other) const
232 {
233 return (d_minValue == other.d_minValue) &&
234 (d_maxValue == other.d_maxValue) &&
235 (d_borderFlags == other.d_borderFlags);
236 }
237
239 inline int QwtDoubleInterval::operator!=(const QwtDoubleInterval &other) const
240 {
241 return (!(*this == other));
242 }
243
248 inline QwtDoubleInterval QwtDoubleInterval::operator|(double value) const
249 {
250 return extend(value);
251 }
252
254 inline bool QwtDoubleInterval::isNull() const
255 {
256 return isValid() && d_minValue >= d_maxValue;
257 }
258
264 inline bool QwtDoubleInterval::isValid() const
265 {
266 if ( (d_borderFlags & ExcludeBorders) == 0 )
267 return d_minValue <= d_maxValue;
268 else
269 return d_minValue < d_maxValue;
270 }
271
278 inline void QwtDoubleInterval::invalidate()
279 {
280 d_minValue = 0.0;
281 d_maxValue = -1.0;
282 }
283
284 #endif