a6848320d9b9c7cb9c5a68e89c4f50d320313f19
1 #!/usr/bin/env python
2 '''
3 Copyright (C) 2005 Aaron Spike, aaron@ekips.org
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.
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.
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
21 class LSystem(inkex.Effect):
22 def __init__(self):
23 inkex.Effect.__init__(self)
24 self.OptionParser.add_option("-o", "--order",
25 action="store", type="int",
26 dest="order", default=3,
27 help="number of iteration")
28 self.OptionParser.add_option("-a", "--angle",
29 action="store", type="float",
30 dest="angle", default=16.0,
31 help="angle for turn commands")
32 self.OptionParser.add_option("-s", "--step",
33 action="store", type="float",
34 dest="step", default=25.0,
35 help="step size")
36 self.OptionParser.add_option("-x", "--axiom",
37 action="store", type="string",
38 dest="axiom", default="++F",
39 help="initial state of system")
40 self.OptionParser.add_option("-r", "--rules",
41 action="store", type="string",
42 dest="rules", default="F=FF-[-F+F+F]+[+F-F-F]",
43 help="replacement rules")
44 self.stack = []
45 self.turtle = pturtle.pTurtle()
46 def iterate(self):
47 self.rules = dict([i.split("=") for i in self.options.rules.upper().split(";") if i.count("=")==1])
48 self.__recurse(self.options.axiom.upper(),0)
49 return self.turtle.getPath()
50 def __recurse(self,rule,level):
51 for c in rule:
52 if level < self.options.order:
53 try:
54 self.__recurse(self.rules[c],level+1)
55 except KeyError:
56 pass
58 if c == 'F':
59 self.turtle.pd()
60 self.turtle.fd(self.options.step)
61 elif c == 'G':
62 self.turtle.pu()
63 self.turtle.fd(self.options.step)
64 elif c == '+':
65 self.turtle.lt(self.options.angle)
66 elif c == '-':
67 self.turtle.rt(self.options.angle)
68 elif c == '|':
69 self.turtle.lt(180)
70 elif c == '[':
71 self.stack.append([self.turtle.getpos(), self.turtle.getheading()])
72 elif c == ']':
73 self.turtle.pu()
74 pos,heading = self.stack.pop()
75 self.turtle.setpos(pos)
76 self.turtle.setheading(heading)
77 def effect(self):
78 new = self.document.createElement('svg:path')
79 s = {'stroke-linejoin': 'miter', 'stroke-width': '1.0px',
80 'stroke-opacity': '1.0', 'fill-opacity': '1.0',
81 'stroke': '#000000', 'stroke-linecap': 'butt',
82 'fill': 'none'}
83 new.setAttribute('style', simplestyle.formatStyle(s))
84 new.setAttribute('d', self.iterate())
85 self.document.documentElement.appendChild(new)
87 e = LSystem()
88 e.affect()