qwt_spline_local.h

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/******************************************************************************
 * 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_LOCAL_H
#define QWT_SPLINE_LOCAL_H

#include "qwt_global.h"
#include "qwt_spline.h"

class QWT_EXPORT QwtSplineLocal : public QwtSplineC1
{
  public:
    enum Type
    {
        Cardinal,

        ParabolicBlending,

        Akima,

        PChip
    };

    QwtSplineLocal( Type type );
    virtual ~QwtSplineLocal();

    Type type() const;

    virtual uint locality() const QWT_OVERRIDE;

    virtual QPainterPath painterPath( const QPolygonF& ) const QWT_OVERRIDE;
    virtual QVector< QLineF > bezierControlLines( const QPolygonF& ) const QWT_OVERRIDE;

    // calculating the parametric equations
    virtual QVector< QwtSplinePolynomial > polynomials( const QPolygonF& ) const QWT_OVERRIDE;
    virtual QVector< double > slopes( const QPolygonF& ) const QWT_OVERRIDE;

  private:
    const Type m_type;
};

#endif