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qwt_spline.h

00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- ***************************** 00002 * Qwt Widget Library 00003 * Copyright (C) 1997 Josef Wilgen 00004 * Copyright (C) 2002 Uwe Rathmann 00005 * 00006 * This library is free software; you can redistribute it and/or 00007 * modify it under the terms of the Qwt License, Version 1.0 00008 *****************************************************************************/ 00009 00010 #ifndef QWT_SPLINE_H 00011 #define QWT_SPLINE_H 00012 00013 #include "qwt_array.h" 00014 #include "qwt_global.h" 00015 00063 class QWT_EXPORT QwtSpline 00064 { 00065 public: 00066 QwtSpline(); 00067 ~QwtSpline(); 00068 00069 double value(double x) const; 00070 int recalc(double *x, double *y, int n, int periodic = 0); 00071 int recalc(const QwtArray<double> &x, const QwtArray<double> &y, 00072 int periodic = 0); 00073 void copyValues(int tf = 1); 00074 00075 private: 00076 int buildPerSpline(); 00077 int buildNatSpline(); 00078 int lookup(double x) const; 00079 void cleanup(); 00080 00081 // coefficient vectors 00082 double *d_a; 00083 double *d_b; 00084 double *d_c; 00085 double *d_d; 00086 00087 // values 00088 double *d_x; 00089 double *d_y; 00090 double *d_xbuffer; 00091 double *d_ybuffer; 00092 int d_size; 00093 00094 //flags 00095 int d_buffered; 00096 }; 00097 00098 00099 00100 00101 00102 #endif 00103 00104 00105 00106 00107

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