share/extensions/whirl.py

   1 #!/usr/bin/env python
   2 '''
   3 Copyright (C) 2005 Aaron Spike, aaron@ekips.org
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 '''
  19 import math, inkex, cubicsuperpath
  20
  21 class Whirl(inkex.Effect):
  22     def __init__(self):
  23         inkex.Effect.__init__(self)
  24         self.OptionParser.add_option("-t", "--whirl",
  25                         action="store", type="float",
  26                         dest="whirl", default=1.0,
  27                         help="amount of whirl")
  28         self.OptionParser.add_option("-r", "--rotation",
  29                         action="store", type="inkbool",
  30                         dest="rotation", default=True,
  31                         help="direction of rotation")
  32     def effect(self):
  33         for id, node in self.selected.iteritems():
  34             rotation = -1
  35             if self.options.rotation == True:
  36                 rotation = 1
  37             whirl = self.options.whirl / 1000
  38             if node.tag == inkex.addNS('path','svg'):
  39                 d = node.get('d')
  40                 p = cubicsuperpath.parsePath(d)
  41                 for sub in p:
  42                     for csp in sub:
  43                         for point in csp:
  44                             point[0] -= self.view_center[0]
  45                             point[1] -= self.view_center[1]
  46                             dist = math.sqrt((point[0] ** 2) + (point[1] ** 2))
  47                             if dist != 0:
  48                                 a = rotation * dist * whirl
  49                                 theta = math.atan2(point[1], point[0]) + a
  50                                 point[0] = (dist * math.cos(theta))
  51                                 point[1] = (dist * math.sin(theta))
  52                             point[0] += self.view_center[0]
  53                             point[1] += self.view_center[1]
  54                 node.set('d',cubicsuperpath.formatPath(p))
  55
  56 if __name__ == '__main__':
  57     e = Whirl()
  58     e.affect()
  59
  60
  61 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99