qwt_spline.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_SPLINE_H
#define QWT_SPLINE_H

#include "qwt_global.h"
#include <qpolygon.h>
#include <qvector.h>

class QWT_EXPORT QwtSpline
{
public:
    enum SplineType
    {
        Natural,

        Periodic
    };

    QwtSpline();
    QwtSpline( const QwtSpline & );

    ~QwtSpline();

    QwtSpline &operator=( const QwtSpline & );

    void setSplineType( SplineType );
    SplineType splineType() const;

    bool setPoints( const QPolygonF& points );
    QPolygonF points() const;

    void reset();

    bool isValid() const;
    double value( double x ) const;

    const QVector<double> &coefficientsA() const;
    const QVector<double> &coefficientsB() const;
    const QVector<double> &coefficientsC() const;

protected:
    bool buildNaturalSpline( const QPolygonF & );
    bool buildPeriodicSpline( const QPolygonF & );

private:
    class PrivateData;
    PrivateData *d_data;
};

#endif