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diff --git a/share/extensions/path_envelope.py b/share/extensions/path_envelope.py
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+# coding=utf-8
+#
+# Copyright (C) 2005 Aaron Spike, aaron@ekips.org
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+
+import inkex
+from inkex.transforms import DirectedLineSegment
+from inkex.localization import inkex_gettext as _
+
+class Envelope(inkex.EffectExtension):
+ """Distort a path/group of paths to a second path"""
+ def effect(self):
+ if len(self.svg.selection) != 2:
+ raise inkex.AbortExtension(_("You must select two objects only."))
+
+ obj, envelope = self.svg.selection.values()
+
+ if isinstance(obj, (inkex.PathElement, inkex.Group)):
+ if isinstance(envelope, inkex.PathElement):
+ # Get bounding box plus any extra composed transform of parents.
+ bbox = obj.bounding_box(obj.getparent().composed_transform())
+
+ # distill trafo into four node points
+ path = envelope.path.transform(envelope.composed_transform()).to_superpath()
+ if len(path[0]) < 4:
+ raise inkex.AbortExtension(_("Selected path is too short. Must be four or more nodes."))
+
+ trafo = [[(csp[1][0], csp[1][1]) for csp in subs] for subs in path][0][:4]
+
+ #vectors pointing away from the trafo origin
+ tbox = [
+ DirectedLineSegment(trafo[0], trafo[1]),
+ DirectedLineSegment(trafo[1], trafo[2]),
+ DirectedLineSegment(trafo[3], trafo[2]),
+ DirectedLineSegment(trafo[0], trafo[3]),
+ ]
+ else:
+ if isinstance(envelope, inkex.Group):
+ raise inkex.AbortExtension(_("The second selected object is a group, not a"
+ " path.\nTry using Object->Ungroup."))
+ raise inkex.AbortExtension(_("The second selected object is not a path.\nTry using"
+ " the procedure Path->Object to Path."))
+ else:
+ raise inkex.AbortExtension(_("The first selected object is neither a path nor a group.\nTry using"
+ " the procedure Path->Object to Path."))
+
+ self.process_object(obj, tbox, bbox)
+
+ def process_object(self, obj, tbox, bbox):
+ if isinstance(obj, inkex.PathElement):
+ self.process_path(obj, tbox, bbox)
+ elif isinstance(obj, inkex.Group):
+ self.process_group(obj, tbox, bbox)
+
+ def process_group(self, group, tbox, bbox):
+ """Go through all groups to process all paths inside them"""
+ for node in group:
+ self.process_object(node, tbox, bbox)
+
+ def process_path(self, element, tbox, bbox):
+ # Get out path's absolute and root coordinates, so obj and envelope
+ # are always in the same coordinate system.
+ points = element.path.to_absolute().transform(element.composed_transform()).to_superpath()
+
+ for subs in points:
+ for csp in subs:
+ csp[0] = self.transform_point(tbox, bbox, *csp[0])
+ csp[1] = self.transform_point(tbox, bbox, *csp[1])
+ csp[2] = self.transform_point(tbox, bbox, *csp[2])
+
+ # Put the modified path back, undo the root transformation
+ element.path = points.to_path().transform(-element.composed_transform())
+
+ @staticmethod
+ def transform_point(tbox, bbox, x, y):
+ """Transform algorithm thanks to Jose Hevia (freon)"""
+ vector = DirectedLineSegment((bbox.left, bbox.top), (x, y))
+ xratio = vector.dx / bbox.width
+ yratio = vector.dy / bbox.height
+ horz = DirectedLineSegment(tbox[0].point_at_ratio(xratio), tbox[2].point_at_ratio(xratio))
+ vert = DirectedLineSegment(tbox[3].point_at_ratio(yratio), tbox[1].point_at_ratio(yratio))
+ return vert.intersect(horz)
+
+if __name__ == '__main__':
+ Envelope().run()