Qwt User's Guide 5.2.3

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qwt_spline.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_SPLINE_H
11 #define QWT_SPLINE_H
12
13 #include "qwt_global.h"
14 #include "qwt_double_rect.h"
15
16 #if QT_VERSION >= 0x040000
17 #include <QPolygonF>
18 #else
19 #include "qwt_array.h"
20 #endif
21
22 // MOC_SKIP_BEGIN
23
24 #if defined(QWT_TEMPLATEDLL)
25
26 #if QT_VERSION < 0x040000
27 #ifndef QWTARRAY_TEMPLATE_QWTDOUBLEPOINT // by mjo3
28 #define QWTARRAY_TEMPLATE_QWTDOUBLEPOINT
29 template class QWT_EXPORT QwtArray<QwtDoublePoint>;
30 #endif //end of QWTARRAY_TEMPLATE_QWTDOUBLEPOINT
31 #endif
32
33 #endif
34
35 // MOC_SKIP_END
36
77 class QWT_EXPORT QwtSpline
78 {
79 public:
81 enum SplineType
82 {
83 Natural,
84 Periodic
85 };
86
87 QwtSpline();
88 QwtSpline( const QwtSpline & );
89
90 ~QwtSpline();
91
92 QwtSpline &operator=( const QwtSpline & );
93
94 void setSplineType(SplineType);
95 SplineType splineType() const;
96
97 #if QT_VERSION < 0x040000
98 bool setPoints(const QwtArray<QwtDoublePoint>& points);
99 QwtArray<QwtDoublePoint> points() const;
100 #else
101 bool setPoints(const QPolygonF& points);
102 QPolygonF points() const;
103 #endif
104
105 void reset();
106
107 bool isValid() const;
108 double value(double x) const;
109
110 const QwtArray<double> &coefficientsA() const;
111 const QwtArray<double> &coefficientsB() const;
112 const QwtArray<double> &coefficientsC() const;
113
114 protected:
115
116 #if QT_VERSION < 0x040000
117 bool buildNaturalSpline(
118 const QwtArray<QwtDoublePoint> &);
119 bool buildPeriodicSpline(
120 const QwtArray<QwtDoublePoint> &);
121 #else
122 bool buildNaturalSpline(const QPolygonF &);
123 bool buildPeriodicSpline(const QPolygonF &);
124 #endif
125
126 class PrivateData;
127 PrivateData *d_data;
128 };
129
130 #endif