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Python Source  |  2010-03-12  |  5.2 KB  |  120 lines
  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 stripme(s):
  22.     return s.strip()
  23.  
  24. class LSystem(inkex.Effect):
  25.     def __init__(self):
  26.         inkex.Effect.__init__(self)
  27.         self.OptionParser.add_option("-o", "--order",
  28.                         action="store", type="int", 
  29.                         dest="order", default=3,
  30.                         help="number of iteration")
  31.         self.OptionParser.add_option("-l", "--langle",
  32.                         action="store", type="float", 
  33.                         dest="langle", default=16.0,
  34.                         help="angle for turning left")
  35.         self.OptionParser.add_option("-r", "--rangle",
  36.                         action="store", type="float", 
  37.                         dest="rangle", default=16.0,
  38.                         help="angle for turning right")
  39.         self.OptionParser.add_option("-s", "--step",
  40.                         action="store", type="float", 
  41.                         dest="step", default=25.0,
  42.                         help="step size")
  43.         self.OptionParser.add_option("-p", "--randomizestep",
  44.                         action="store", type="float", 
  45.                         dest="randomizestep", default=0.0,
  46.                         help="randomize step")
  47.         self.OptionParser.add_option("-z", "--randomizeangle",
  48.                         action="store", type="float", 
  49.                         dest="randomizeangle", default=0.0,
  50.                         help="randomize angle")
  51.         self.OptionParser.add_option("-x", "--axiom",
  52.                         action="store", type="string", 
  53.                         dest="axiom", default="++F",
  54.                         help="initial state of system")
  55.         self.OptionParser.add_option("-u", "--rules",
  56.                         action="store", type="string", 
  57.                         dest="rules", default="F=FF-[-F+F+F]+[+F-F-F]",
  58.                         help="replacement rules")
  59.         self.OptionParser.add_option("-t", "--tab",
  60.                         action="store", type="string",
  61.                         dest="tab")
  62.         self.stack = []
  63.         self.turtle = pturtle.pTurtle()
  64.     def iterate(self):
  65.         self.rules = dict([map(stripme, i.split("=")) for i in self.options.rules.upper().split(";") if i.count("=")==1])
  66.         string = self.__recurse(self.options.axiom.upper(),0)
  67.         self.__compose_path(string)
  68.         return self.turtle.getPath()
  69.     def __compose_path(self, string):
  70.         self.turtle.pu()
  71.         self.turtle.setpos(self.view_center)
  72.         self.turtle.pd()
  73.         for c in string:
  74.             if c in 'ABCDEF':
  75.                 self.turtle.pd()
  76.                 self.turtle.fd(self.options.step * (random.normalvariate(1.0, 0.01 * self.options.randomizestep)))
  77.             elif c in 'GHIJKL':
  78.                 self.turtle.pu()
  79.                 self.turtle.fd(self.options.step * (random.normalvariate(1.0,  0.01 * self.options.randomizestep)))
  80.             elif c == '+':
  81.                 self.turtle.lt(self.options.langle * (random.normalvariate(1.0,  0.01 * self.options.randomizeangle)))
  82.             elif c == '-':
  83.                 self.turtle.rt(self.options.rangle * (random.normalvariate(1.0,  0.01 * self.options.randomizeangle)))
  84.             elif c == '|':
  85.                 self.turtle.lt(180)
  86.             elif c == '[':
  87.                 self.stack.append([self.turtle.getpos(), self.turtle.getheading()])
  88.             elif c == ']':
  89.                 self.turtle.pu()
  90.                 pos,heading = self.stack.pop()
  91.                 self.turtle.setpos(pos)
  92.                 self.turtle.setheading(heading)
  93.  
  94.     def __recurse(self,rule,level):
  95.         level_string = ''
  96.         for c in rule:
  97.             if level < self.options.order:
  98.                 try:
  99.                     level_string = level_string + self.__recurse(self.rules[c],level+1)
  100.                 except KeyError:
  101.                     level_string = level_string + c
  102.             else:
  103.                 level_string = level_string + c 
  104.         return level_string
  105.             
  106.     def effect(self):
  107.         s = {'stroke-linejoin': 'miter', 'stroke-width': '1.0px', 
  108.             'stroke-opacity': '1.0', 'fill-opacity': '1.0', 
  109.             'stroke': '#000000', 'stroke-linecap': 'butt', 
  110.             'fill': 'none'}
  111.         attribs = {'style':simplestyle.formatStyle(s),'d':self.iterate()}
  112.         inkex.etree.SubElement(self.current_layer,inkex.addNS('path','svg'),attribs)
  113.  
  114. if __name__ == '__main__':
  115.     e = LSystem()
  116.     e.affect()
  117.  
  118.  
  119. # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
  120.