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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_LPE_TANGENT_TO_CURVE_H
#define INKSCAPE_LPE_TANGENT_TO_CURVE_H
/** \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 v2+, 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 {
public:
LPETangentToCurve(LivePathEffectObject *lpeobject);
~LPETangentToCurve() override;
Geom::Piecewise<Geom::D2<Geom::SBasis> >
doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in) override;
/* the knotholder entity classes must be declared friends */
friend class TtC::KnotHolderEntityLeftEnd;
friend class TtC::KnotHolderEntityRightEnd;
friend class TtC::KnotHolderEntityAttachPt;
void addKnotHolderEntities(KnotHolder * knotholder, SPItem * item) override;
private:
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&) = delete;
LPETangentToCurve& operator=(const LPETangentToCurve&) = delete;
};
} //namespace LivePathEffect
} //namespace Inkscape
#endif
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