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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* LPE <perp_bisector> implementation.
*/
/*
* Authors:
* Maximilian Albert
* Johan Engelen
*
* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
* Copyright (C) Maximilin Albert 2008 <maximilian.albert@gmail.com>
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "live_effects/lpe-perp_bisector.h"
#include "display/curve.h"
#include "line-geometry.h"
#include "object/sp-path.h"
#include "ui/knot/knot-holder.h"
#include "ui/knot/knot-holder-entity.h"
// TODO due to internal breakage in glibmm headers, this must be last:
#include <glibmm/i18n.h>
namespace Inkscape {
namespace LivePathEffect {
namespace PB {
class KnotHolderEntityEnd : public LPEKnotHolderEntity {
public:
KnotHolderEntityEnd(LPEPerpBisector *effect) : LPEKnotHolderEntity(effect) {};
void bisector_end_set(Geom::Point const &p, guint state, bool left = true);
};
class KnotHolderEntityLeftEnd : public KnotHolderEntityEnd {
public:
KnotHolderEntityLeftEnd(LPEPerpBisector *effect) : KnotHolderEntityEnd(effect) {};
void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override;
Geom::Point knot_get() const override;
};
class KnotHolderEntityRightEnd : public KnotHolderEntityEnd {
public:
KnotHolderEntityRightEnd(LPEPerpBisector *effect) : KnotHolderEntityEnd(effect) {};
void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override;
Geom::Point knot_get() const override;
};
Geom::Point
KnotHolderEntityLeftEnd::knot_get() const {
LPEPerpBisector const* lpe = dynamic_cast<LPEPerpBisector const*>(_effect);
return Geom::Point(lpe->C);
}
Geom::Point
KnotHolderEntityRightEnd::knot_get() const {
LPEPerpBisector const* lpe = dynamic_cast<LPEPerpBisector const*>(_effect);
return Geom::Point(lpe->D);
}
void
KnotHolderEntityEnd::bisector_end_set(Geom::Point const &p, guint state, bool left) {
LPEPerpBisector *lpe = dynamic_cast<LPEPerpBisector *>(_effect);
if (!lpe) return;
Geom::Point const s = snap_knot_position(p, state);
double lambda = Geom::nearest_time(s, lpe->M, lpe->perp_dir);
if (left) {
lpe->C = lpe->M + lpe->perp_dir * lambda;
lpe->length_left.param_set_value(lambda);
} else {
lpe->D = lpe->M + lpe->perp_dir * lambda;
lpe->length_right.param_set_value(-lambda);
}
// FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), true, true);
}
void
KnotHolderEntityLeftEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state) {
bisector_end_set(p, state);
}
void
KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state) {
bisector_end_set(p, state, false);
}
} //namescape PB
LPEPerpBisector::LPEPerpBisector(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
length_left(_("Length left:"), _("Specifies the left end of the bisector"), "length-left", &wr, this, 200),
length_right(_("Length right:"), _("Specifies the right end of the bisector"), "length-right", &wr, this, 200),
A(0,0), B(0,0), M(0,0), C(0,0), D(0,0), perp_dir(0,0)
{
show_orig_path = true;
_provides_knotholder_entities = true;
// register all your parameters here, so Inkscape knows which parameters this effect has:
registerParameter(&length_left);
registerParameter(&length_right);
}
LPEPerpBisector::~LPEPerpBisector()
= default;
void
LPEPerpBisector::doOnApply (SPLPEItem const*/*lpeitem*/)
{
/* make the path a straight line */
/**
SPCurve* curve = sp_path_getCurveForEdit (SP_PATH(lpeitem)); // TODO: Should we use sp_shape_get_curve()?
Geom::Point A(curve->first_point());
Geom::Point B(curve->last_point());
SPCurve *c = new SPCurve();
c->moveto(A);
c->lineto(B);
// TODO: Why doesn't sp_path_set_curve_before_LPE(SP_PATH(lpeitem), c, TRUE, true) work?
SP_PATH(lpeitem)->original_curve = c->ref();
c->unref();
**/
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEPerpBisector::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
Piecewise<D2<SBasis> > output;
A = pwd2_in.firstValue();
B = pwd2_in.lastValue();
M = (A + B)/2;
perp_dir = unit_vector((B - A).ccw());
C = M + perp_dir * length_left;
D = M - perp_dir * length_right;
output = Piecewise<D2<SBasis> >(D2<SBasis>(SBasis(C[X], D[X]), SBasis(C[Y], D[Y])));
return output;
}
void
LPEPerpBisector::addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item) {
{
KnotHolderEntity *e = new PB::KnotHolderEntityLeftEnd(this);
e->create(desktop, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:PerpBisectorLeftEnd",
_("Adjust the \"left\" end of the bisector"));
knotholder->add(e);
}
{
KnotHolderEntity *e = new PB::KnotHolderEntityRightEnd(this);
e->create(desktop, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:PerpBisectorRightEnd",
_("Adjust the \"right\" end of the bisector"));
knotholder->add(e);
}
};
/* ######################## */
} //namespace LivePathEffect
} /* namespace Inkscape */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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