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#!/usr/bin/env python
# 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.
#
"""Whirl path extension (modify path)"""
import math
import inkex
class Whirl(inkex.EffectExtension):
"""Modify a path by twisting the nodes around a point"""
def add_arguments(self, pars):
pars.add_argument("-t", "--whirl", type=float,\
default=1.0, help="amount of whirl")
pars.add_argument("-r", "--rotation", type=inkex.Boolean,\
default=True, help="direction of rotation")
def effect(self):
view_center = self.svg.namedview.center
rotation = 1 if self.options.rotation else -1
whirl = self.options.whirl / 1000
for node in self.svg.selection.filter(inkex.PathElement).values():
self.whirl_node(view_center, rotation, whirl, node)
@staticmethod
def whirl_node(center, direction, ammount, node):
"""Apply a whirl to a path given the center, direction and amount"""
path = node.path.to_superpath()
for sub in path:
for csp in sub:
for point in csp:
point[0] -= center[0]
point[1] -= center[1]
dist = math.sqrt((point[0] ** 2) + (point[1] ** 2))
if dist != 0:
art = direction * dist * ammount
theta = math.atan2(point[1], point[0]) + art
point[0] = (dist * math.cos(theta))
point[1] = (dist * math.sin(theta))
point[0] += center[0]
point[1] += center[1]
node.path = path
if __name__ == '__main__':
Whirl().run()
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