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("-x", "--centerx",
  25                                                 action="store", type="float",
  26                                                 dest="centerx", default=10.0,
  27                                                 help="")
  28                 self.OptionParser.add_option("-y", "--centery",
  29                                                 action="store", type="float",
  30                                                 dest="centery", default=0.0,
  31                                                 help="")
  32                 self.OptionParser.add_option("-t", "--whirl",
  33                                                 action="store", type="float",
  34                                                 dest="whirl", default=1.0,
  35                                                 help="amount of whirl")
  36                 self.OptionParser.add_option("-r", "--rotation",
  37                                                 action="store", type="inkbool",
  38                                                 dest="rotation", default=True,
  39                                                 help="direction of rotation")
  40         def effect(self):
  41                 for id, node in self.selected.iteritems():
  42                         rotation = -1
  43                         if self.options.rotation == True:
  44                                 rotation = 1
  45                         whirl = self.options.whirl / 1000
  46                         if node.tagName == 'path':
  47                                 d = node.attributes.getNamedItem('d')
  48                                 p = cubicsuperpath.parsePath(d.value)
  49                                 for sub in p:
  50                                         for csp in sub:
  51                                                 for point in csp:
  52                                                         point[0] -= self.options.centerx
  53                                                         point[1] -= self.options.centery
  54                                                         dist = math.sqrt((point[0] ** 2) + (point[1] ** 2))
  55                                                         if dist != 0:
  56                                                                 a = rotation * dist * whirl
  57                                                                 theta = math.atan2(point[1], point[0]) + a
  58                                                                 point[0] = (dist * math.cos(theta))
  59                                                                 point[1] = (dist * math.sin(theta))
  60                                                         point[0] += self.options.centerx
  61                                                         point[1] += self.options.centery
  62                                 d.value = cubicsuperpath.formatPath(p)
  63
  64 e = Whirl()
  65 e.affect()