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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()
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