share/extensions/rtree.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 inkex, simplestyle, pturtle, random
  20
  21 def rtree(turtle, size, min):
  22         if size < min:
  23                 return
  24         turtle.fd(size)
  25         turn = random.uniform(20, 40)
  26         turtle.lt(turn)
  27         rtree(turtle, size*random.uniform(0.5,0.9), min)
  28         turtle.rt(turn)
  29         turn = random.uniform(20, 40)
  30         turtle.rt(turn)
  31         rtree(turtle, size*random.uniform(0.5,0.9), min)
  32         turtle.lt(turn)
  33         turtle.bk(size)
  34
  35 class RTreeTurtle(inkex.Effect):
  36         def __init__(self):
  37                 inkex.Effect.__init__(self)
  38                 self.OptionParser.add_option("-s", "--size",
  39                                                 action="store", type="float",
  40                                                 dest="size", default=100.0,
  41                                                 help="initial branch size")
  42                 self.OptionParser.add_option("-m", "--minimum",
  43                                                 action="store", type="float",
  44                                                 dest="minimum", default=4.0,
  45                                                 help="minimum branch size")
  46         def effect(self):
  47                 new = self.document.createElement('svg:path')
  48                 s = {'stroke-linejoin': 'miter', 'stroke-width': '1.0px',
  49                         'stroke-opacity': '1.0', 'fill-opacity': '1.0',
  50                         'stroke': '#000000', 'stroke-linecap': 'butt',
  51                         'fill': 'none'}
  52                 new.setAttribute('style', simplestyle.formatStyle(s))
  53                 t = pturtle.pTurtle()
  54                 rtree(t, self.options.size, self.options.minimum)
  55                 new.setAttribute('d', t.getPath())
  56                 self.document.documentElement.appendChild(new)
  57
  58 e = RTreeTurtle()
  59 e.affect()