1 files changed, 153 insertions, 0 deletions
diff --git a/src/live_effects/lpe-angle_bisector.cpp b/src/live_effects/lpe-angle_bisector.cpp
new file mode 100644
index 0000000..28afe20
--- /dev/null
+++ b/src/live_effects/lpe-angle_bisector.cpp
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *   Maximilian Albert <maximilian.albert@gmail.com>
+ *   Johan Engelen <j.b.c.engelen@alumnus.utwente.nl>
+ *
+ * Copyright (C) Authors 2007-2012
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/lpe-angle_bisector.h"
+#include "2geom/sbasis-to-bezier.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 AB {
+
+class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity {
+public:
+    KnotHolderEntityLeftEnd(LPEAngleBisector* 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(LPEAngleBisector* effect) : LPEKnotHolderEntity(effect) {};
+    void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override;
+    Geom::Point knot_get() const override;
+};
+
+} // namespace AB
+
+LPEAngleBisector::LPEAngleBisector(LivePathEffectObject *lpeobject) :
+    Effect(lpeobject),
+    length_left(_("Length left:"), _("Specifies the left end of the bisector"), "length-left", &wr, this, 0),
+    length_right(_("Length right:"), _("Specifies the right end of the bisector"), "length-right", &wr, this, 250)
+{
+    show_orig_path = true;
+    _provides_knotholder_entities = true;
+
+    registerParameter( dynamic_cast<Parameter *>(&length_left) );
+    registerParameter( dynamic_cast<Parameter *>(&length_right) );
+}
+
+LPEAngleBisector::~LPEAngleBisector()
+= default;
+
+Geom::PathVector
+LPEAngleBisector::doEffect_path (Geom::PathVector const & path_in)
+{
+    using namespace Geom;
+
+    // we assume that the path has >= 3 nodes
+    ptA = path_in[0].pointAt(1);
+    Point B = path_in[0].initialPoint();
+    Point C = path_in[0].pointAt(2);
+
+    double angle = angle_between(B - ptA, C - ptA);
+
+    dir = unit_vector(B - ptA) * Rotate(angle/2);
+
+    Geom::Point D = ptA - dir * length_left;
+    Geom::Point E = ptA + dir * length_right;
+
+    Piecewise<D2<SBasis> > output = Piecewise<D2<SBasis> >(D2<SBasis>(SBasis(D[X], E[X]), SBasis(D[Y], E[Y])));
+
+    return path_from_piecewise(output, LPE_CONVERSION_TOLERANCE);
+}
+
+void
+LPEAngleBisector::addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item) {
+    {
+        KnotHolderEntity *e = new AB::KnotHolderEntityLeftEnd(this);
+        e->create(desktop, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:LeftEnd",
+                  _("Adjust the \"left\" end of the bisector"));
+        knotholder->add(e);
+    }
+    {
+        KnotHolderEntity *e = new AB::KnotHolderEntityRightEnd(this);
+        e->create(desktop, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:RightEnd",
+                  _("Adjust the \"right\" end of the bisector"));
+        knotholder->add(e);
+    }
+};
+
+namespace AB {
+
+void
+KnotHolderEntityLeftEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)
+{
+    LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);
+
+    Geom::Point const s = snap_knot_position(p, state);
+
+    double lambda = Geom::nearest_time(s, lpe->ptA, 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)
+{
+    LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);
+
+    Geom::Point const s = snap_knot_position(p, state);
+
+    double lambda = Geom::nearest_time(s, lpe->ptA, 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
+{
+    LPEAngleBisector const* lpe = dynamic_cast<LPEAngleBisector const*>(_effect);
+    return lpe->ptA - lpe->dir * lpe->length_left;
+}
+
+Geom::Point
+KnotHolderEntityRightEnd::knot_get() const
+{
+    LPEAngleBisector const* lpe = dynamic_cast<LPEAngleBisector const*>(_effect);
+    return lpe->ptA + lpe->dir * lpe->length_right;
+}
+
+} // namespace AB
+
+/* ######################## */
+
+} //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 :