Qwt User's Guide  5.2.3
qwt_double_range.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_RANGE_H
11 #define QWT_DOUBLE_RANGE_H
12 
13 #include "qwt_global.h"
14 
31 class QWT_EXPORT QwtDoubleRange
32 {
33 public:
34  QwtDoubleRange();
35  virtual ~QwtDoubleRange();
36 
37  void setRange(double vmin, double vmax, double vstep = 0.0,
38  int pagesize = 1);
39 
40  void setValid(bool);
41  bool isValid() const;
42 
43  virtual void setValue(double);
44  double value() const;
45 
46  void setPeriodic(bool tf);
47  bool periodic() const;
48 
49  void setStep(double);
50  double step() const;
51 
52  double maxValue() const;
53  double minValue() const;
54 
55  int pageSize() const;
56 
57  virtual void incValue(int);
58  virtual void incPages(int);
59  virtual void fitValue(double);
60 
61 protected:
62 
63  double exactValue() const;
64  double exactPrevValue() const;
65  double prevValue() const;
66 
67  virtual void valueChange();
68  virtual void stepChange();
69  virtual void rangeChange();
70 
71 private:
72  void setNewValue(double x, bool align = false);
73 
74  double d_minValue;
75  double d_maxValue;
76  double d_step;
77  int d_pageSize;
78 
79  bool d_isValid;
80  double d_value;
81  double d_exactValue;
82  double d_exactPrevValue;
83  double d_prevValue;
84 
85  bool d_periodic;
86 };
87 
88 #endif
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