From cca66b9ec4e494c1d919bff0f71a820d8afab1fa Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:24:48 +0200 Subject: Adding upstream version 1.2.2. Signed-off-by: Daniel Baumann --- src/live_effects/lpe-parallel.cpp | 182 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 182 insertions(+) create mode 100644 src/live_effects/lpe-parallel.cpp (limited to 'src/live_effects/lpe-parallel.cpp') diff --git a/src/live_effects/lpe-parallel.cpp b/src/live_effects/lpe-parallel.cpp new file mode 100644 index 0000000..799108e --- /dev/null +++ b/src/live_effects/lpe-parallel.cpp @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * LPE implementation + */ +/* + * Authors: + * Maximilian Albert + * + * Copyright (C) Johan Engelen 2007-2012 + * Copyright (C) Maximilian Albert 2008 + * + * 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 + +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(lpeitem); + if (!shape) { + g_warning("LPE parallel can only be applied to shapes (not groups)."); + SPLPEItem * item = const_cast(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 > +LPEParallel::doEffect_pwd2 (Geom::Piecewise > const & pwd2_in) +{ + using namespace Geom; + + Piecewise > 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(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(_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(_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(_effect); + return lpe->C; +} + +Geom::Point +KnotHolderEntityRightEnd::knot_get() const +{ + LPEParallel const *lpe = dynamic_cast(_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 : -- cgit v1.2.3