summaryrefslogtreecommitdiffstats
path: root/src/live_effects/lpe-perp_bisector.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/live_effects/lpe-perp_bisector.cpp183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/live_effects/lpe-perp_bisector.cpp b/src/live_effects/lpe-perp_bisector.cpp
new file mode 100644
index 0000000..edc7057
--- /dev/null
+++ b/src/live_effects/lpe-perp_bisector.cpp
@@ -0,0 +1,183 @@
+// 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 :