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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* LPE <parallel> implementation
*/
/*
* Authors:
* Maximilian Albert
*
* Copyright (C) Johan Engelen 2007-2012 <j.b.c.engelen@alumnus.utwente.nl>
* Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "lpe-parallel.h"
#include "display/curve.h"
#include "object/sp-shape.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 Pl {
class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity {
public:
KnotHolderEntityLeftEnd(LPEParallel *effect) : LPEKnotHolderEntity(effect) {};
void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override;
Geom::Point knot_get() const override;
};
class KnotHolderEntityRightEnd : public LPEKnotHolderEntity {
public:
KnotHolderEntityRightEnd(LPEParallel *effect) : LPEKnotHolderEntity(effect) {};
void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override;
Geom::Point knot_get() const override;
};
} // namespace Pl
LPEParallel::LPEParallel(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
// initialise your parameters here:
offset_pt(_("Offset"), _("Adjust the offset"), "offset_pt", &wr, this),
length_left(_("Length left:"), _("Specifies the left end of the parallel"), "length-left", &wr, this, 150),
length_right(_("Length right:"), _("Specifies the right end of the parallel"), "length-right", &wr, this, 150)
{
show_orig_path = true;
_provides_knotholder_entities = true;
registerParameter(&offset_pt);
registerParameter(&length_left);
registerParameter(&length_right);
}
LPEParallel::~LPEParallel()
= default;
void
LPEParallel::doOnApply (SPLPEItem const* lpeitem)
{
auto shape = dynamic_cast<SPShape const *>(lpeitem);
if (!shape) {
g_warning("LPE parallel can only be applied to shapes (not groups).");
SPLPEItem * item = const_cast<SPLPEItem*>(lpeitem);
item->removeCurrentPathEffect(false);
return;
}
SPCurve const *curve = shape->curve();
A = *(curve->first_point());
B = *(curve->last_point());
dir = unit_vector(B - A);
Geom::Point offset = (A + B)/2 + dir.ccw() * 100;
offset_pt.param_update_default(offset);
offset_pt.param_setValue(offset, true);
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEParallel::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();
dir = unit_vector(B - A);
C = offset_pt - dir * length_left;
D = offset_pt + dir * length_right;
output = Piecewise<D2<SBasis> >(D2<SBasis>(SBasis(C[X], D[X]), SBasis(C[Y], D[Y])));
return output + dir;
}
void LPEParallel::addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item) {
{
KnotHolderEntity *e = new Pl::KnotHolderEntityLeftEnd(this);
e->create(desktop, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:ParallelLeftEnd",
_("Adjust the \"left\" end of the parallel"));
knotholder->add(e);
}
{
KnotHolderEntity *e = new Pl::KnotHolderEntityRightEnd(this);
e->create(desktop, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:ParallelRightEnd",
_("Adjust the \"right\" end of the parallel"));
knotholder->add(e);
}
};
namespace Pl {
void
KnotHolderEntityLeftEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)
{
using namespace Geom;
LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
Geom::Point const s = snap_knot_position(p, state);
double lambda = L2(s - lpe->offset_pt) * sgn(dot(s - lpe->offset_pt, lpe->dir));
lpe->length_left.param_set_value(-lambda);
sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
}
void
KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)
{
using namespace Geom;
LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
Geom::Point const s = snap_knot_position(p, state);
double lambda = L2(s - lpe->offset_pt) * sgn(dot(s - lpe->offset_pt, lpe->dir));
lpe->length_right.param_set_value(lambda);
sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
}
Geom::Point
KnotHolderEntityLeftEnd::knot_get() const
{
LPEParallel const *lpe = dynamic_cast<LPEParallel const*>(_effect);
return lpe->C;
}
Geom::Point
KnotHolderEntityRightEnd::knot_get() const
{
LPEParallel const *lpe = dynamic_cast<LPEParallel const*>(_effect);
return lpe->D;
}
} // namespace Pl
/* ######################## */
} //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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