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/*
Copyright (C) 1998 Jürgen Hochwald <juergen.hochwald@privat.kkf.net>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef SPLINE_H
#define SPLINE_H
#include <stdlib.h>
#include <vector>
class Spline
{
struct Group
{
double x, y, y2;
};
std::vector<Spline::Group> mPoints;
bool mRecalc;
double yp1;
double ypn;
// stupid AIX[?] compiler won't let me give it a value here
static const bool natural;
public:
Spline();
Spline(const Spline ©);
Spline &operator =(const Spline ©);
~Spline();
/**
* if the curve had @p count points, return them
**/
std::vector<double> points(int count) const;
void add(double x, double y);
double spline(double xarg) const;
double operator[] (double xarg) const { return spline(xarg); }
int numPoints() const { return mPoints.size(); }
double x(int num) const;
double y(int num) const;
void clear();
private:
void calcSpline() const
{
const_cast<Spline*>(this)->calcSpline();
}
void calcSpline();
};
#endif
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