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/** \file
 * LPE <tangent_to_curve> implementation, see lpe-tangent_to_curve.cpp.

 * Authors:
 *   Johan Engelen
 *   Maximilian Albert
 * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
 * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
 * Released under GNU GPL, read the file 'COPYING' for more information

#include "live_effects/effect.h"
#include "live_effects/parameter/parameter.h"
#include "live_effects/parameter/point.h"

namespace Inkscape {
namespace LivePathEffect {

namespace TtC {
  // we need a separate namespace to avoid clashes with LPEPerpBisector
  class KnotHolderEntityLeftEnd;
  class KnotHolderEntityRightEnd;
  class KnotHolderEntityAttachPt;

class LPETangentToCurve : public Effect {
    LPETangentToCurve(LivePathEffectObject *lpeobject);
    virtual ~LPETangentToCurve();

    virtual Geom::Piecewise<Geom::D2<Geom::SBasis> >
      doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);

    /* the knotholder entity classes must be declared friends */
    friend class TtC::KnotHolderEntityLeftEnd;
    friend class TtC::KnotHolderEntityRightEnd;
    friend class TtC::KnotHolderEntityAttachPt;

    ScalarParam angle;

    ScalarParam t_attach;
    ScalarParam length_left;
    ScalarParam length_right;

    Geom::Point ptA; // point of attachment to the curve
    Geom::Point derivA;

    Geom::Point C; // left end of tangent
    Geom::Point D; // right end of tangent

    LPETangentToCurve(const LPETangentToCurve&);
    LPETangentToCurve& operator=(const LPETangentToCurve&);

} //namespace LivePathEffect
} //namespace Inkscape


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