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lindenmayer.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 inkex, simplestyle, pturtle

class LSystem(inkex.Effect):
      def __init__(self):
            inkex.Effect.__init__(self)
            self.OptionParser.add_option("-o", "--order",
                                    action="store", type="int", 
                                    dest="order", default=3,
                                    help="number of iteration")
            self.OptionParser.add_option("-a", "--angle",
                                    action="store", type="float", 
                                    dest="angle", default=16.0,
                                    help="angle for turn commands")
            self.OptionParser.add_option("-s", "--step",
                                    action="store", type="float", 
                                    dest="step", default=25.0,
                                    help="step size")
            self.OptionParser.add_option("-x", "--axiom",
                                    action="store", type="string", 
                                    dest="axiom", default="++F",
                                    help="initial state of system")
            self.OptionParser.add_option("-r", "--rules",
                                    action="store", type="string", 
                                    dest="rules", default="F=FF-[-F+F+F]+[+F-F-F]",
                                    help="replacement rules")
            self.stack = []
            self.turtle = pturtle.pTurtle()
      def iterate(self):
            self.rules = dict([i.split("=") for i in self.options.rules.upper().split(";") if i.count("=")==1])
            self.__recurse(self.options.axiom.upper(),0)
            return self.turtle.getPath()
      def __recurse(self,rule,level):
            for c in rule:
                  if level < self.options.order:
                        try:
                              self.__recurse(self.rules[c],level+1)
                        except KeyError:
                              pass
                  
                  if c == 'F':
                        self.turtle.pd()
                        self.turtle.fd(self.options.step)
                  elif c == 'G':
                        self.turtle.pu()
                        self.turtle.fd(self.options.step)
                  elif c == '+':
                        self.turtle.lt(self.options.angle)
                  elif c == '-':
                        self.turtle.rt(self.options.angle)
                  elif c == '|':
                        self.turtle.lt(180)
                  elif c == '[':
                        self.stack.append([self.turtle.getpos(), self.turtle.getheading()])
                  elif c == ']':
                        self.turtle.pu()
                        pos,heading = self.stack.pop()
                        self.turtle.setpos(pos)
                        self.turtle.setheading(heading)
      def effect(self):
            new = self.document.createElement('svg:path')
            s = {'stroke-linejoin': 'miter', 'stroke-width': '1.0px', 
                  'stroke-opacity': '1.0', 'fill-opacity': '1.0', 
                  'stroke': '#000000', 'stroke-linecap': 'butt', 
                  'fill': 'none'}
            new.setAttribute('style', simplestyle.formatStyle(s))
            new.setAttribute('d', self.iterate())
            self.document.documentElement.appendChild(new)

e = LSystem()
e.affect()

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