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/*
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Copyright (C) 1998 J<EFBFBD>rgen Hochwald <juergen.hochwald@privat.kkf.net>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef SPLINE_H
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#define SPLINE_H
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#include <stdlib.h>
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#include <vector>
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class Spline
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{
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struct Group
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{
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double x, y, y2;
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};
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std::vector<Spline::Group> mPoints;
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bool mRecalc;
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double yp1;
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double ypn;
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// stupid AIX[?] compiler won't let me give it a value here
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static const bool natural;
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public:
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Spline();
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Spline(const Spline ©);
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Spline &operator =(const Spline ©);
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~Spline();
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/**
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* if the curve had @p count points, return them
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**/
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std::vector<double> points(int count) const;
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void add(double x, double y);
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double spline(double xarg) const;
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double operator[] (double xarg) const { return spline(xarg); }
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int numPoints() const { return mPoints.size(); }
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double x(int num) const;
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double y(int num) const;
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void clear();
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private:
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void calcSpline() const
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{
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const_cast<Spline*>(this)->calcSpline();
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}
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void calcSpline();
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};
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#endif
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