69 lines
2.4 KiB
Python
69 lines
2.4 KiB
Python
#!/usr/bin/env python3
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# coding=utf-8
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#
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# Copyright (C) 2005 Aaron Spike, aaron@ekips.org
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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"""Twirl path extension (modify path)"""
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import math
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import inkex
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class Twirl(inkex.EffectExtension):
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"""Modify a path by twisting the nodes around a point"""
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def add_arguments(self, pars):
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pars.add_argument(
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"-t", "--twirl", type=float, default=5.0, help="amount of twirl"
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)
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pars.add_argument(
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"-r",
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"--rotation",
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type=inkex.Boolean,
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default=True,
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help="direction of rotation",
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)
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def effect(self):
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view_center = self.svg.namedview.center
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rotation = 1 if self.options.rotation else -1
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twirl = self.options.twirl / 1000
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for node in self.svg.selection.filter(inkex.PathElement):
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self.twirl_node(view_center, rotation, twirl, node)
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@staticmethod
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def twirl_node(center, direction, ammount, node):
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"""Apply a twirl to a path given the center, direction and amount"""
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path = node.path.to_superpath()
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for sub in path:
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for csp in sub:
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for point in csp:
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point[0] -= center[0]
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point[1] -= center[1]
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dist = math.sqrt((point[0] ** 2) + (point[1] ** 2))
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if dist != 0:
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art = direction * dist * ammount
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theta = math.atan2(point[1], point[0]) + art
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point[0] = dist * math.cos(theta)
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point[1] = dist * math.sin(theta)
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point[0] += center[0]
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point[1] += center[1]
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node.path = path
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if __name__ == "__main__":
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Twirl().run()
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