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whirl.py

#!/usr/bin/env python 
'''
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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
'''
import math, inkex, cubicsuperpath

class Whirl(inkex.Effect):
      def __init__(self):
            inkex.Effect.__init__(self)
            self.OptionParser.add_option("-x", "--centerx",
                                    action="store", type="float", 
                                    dest="centerx", default=10.0,
                                    help="")
            self.OptionParser.add_option("-y", "--centery",
                                    action="store", type="float", 
                                    dest="centery", default=0.0,
                                    help="")
            self.OptionParser.add_option("-t", "--whirl",
                                    action="store", type="float", 
                                    dest="whirl", default=1.0,
                                    help="amount of whirl")
            self.OptionParser.add_option("-r", "--rotation",
                                    action="store", type="inkbool", 
                                    dest="rotation", default=True,
                                    help="direction of rotation")
      def effect(self):
            for id, node in self.selected.iteritems():
                  rotation = 1
                  if self.options.rotation == True:
                        rotation = -1
                  whirl = self.options.whirl / 1000
                  if node.tagName == 'path':
                        d = node.attributes.getNamedItem('d')
                        p = cubicsuperpath.parsePath(d.value)
                        for sub in p:
                              for csp in sub:
                                    for point in csp:
                                          point[0] -= self.options.centerx
                                          point[1] -= self.options.centery
                                          dist = math.sqrt((point[0] ** 2) + (point[1] ** 2))
                                          if dist != 0:
                                                a = rotation * dist * whirl
                                                      theta = math.atan2(point[1], point[0]) + a
                                                          point[0] = (dist * math.cos(theta))
                                                          point[1] = (dist * math.sin(theta))
                                          point[0] += self.options.centerx
                                          point[1] += self.options.centery
                        d.value = cubicsuperpath.formatPath(p)

e = Whirl()
e.affect()

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