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#!/usr/bin/env python
# coding=utf-8
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
import random
import inkex
from inkex import turtle as pturtle
class Lindenmayer(inkex.GenerateExtension):
def add_arguments(self, pars):
pars.add_argument("--tab")
pars.add_argument("--order", type=int, default=3, help="number of iteration")
pars.add_argument("--langle", type=float, default=16.0, help="angle for turning left")
pars.add_argument("--rangle", type=float, default=16.0, help="angle for turning right")
pars.add_argument("--step", type=float, default=25.0, help="step size")
pars.add_argument("--randomizestep", type=float, default=0.0, help="randomize step")
pars.add_argument("--randomizeangle", type=float, default=0.0, help="randomize angle")
pars.add_argument("--axiom", default="++F", help="initial state of system")
pars.add_argument("--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([map((lambda s: s.strip()), i.split("=")) for i in self.options.rules.upper().split(";") if i.count("=") == 1])
string = self.__recurse(self.options.axiom.upper(), 0)
self.__compose_path(string)
return self.turtle.getPath()
def __compose_path(self, string):
self.turtle.pu()
point = self.svg.namedview.center
self.turtle.setpos(point)
self.turtle.pd()
for c in string:
if c in 'ABCDEF':
self.turtle.pd()
self.turtle.fd(self.options.step * (random.normalvariate(1.0, 0.01 * self.options.randomizestep)))
elif c in 'GHIJKL':
self.turtle.pu()
self.turtle.fd(self.options.step * (random.normalvariate(1.0, 0.01 * self.options.randomizestep)))
elif c == '+':
self.turtle.lt(self.options.langle * (random.normalvariate(1.0, 0.01 * self.options.randomizeangle)))
elif c == '-':
self.turtle.rt(self.options.rangle * (random.normalvariate(1.0, 0.01 * self.options.randomizeangle)))
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 __recurse(self, rule, level):
level_string = ''
for c in rule:
if level < self.options.order:
try:
level_string = level_string + self.__recurse(self.rules[c], level + 1)
except KeyError:
level_string = level_string + c
else:
level_string = level_string + c
return level_string
def generate(self):
self.options.step = self.svg.unittouu(str(self.options.step) + 'px')
sty = {'stroke-linejoin': 'miter', 'stroke-width': str(self.svg.unittouu('1px')),
'stroke-opacity': '1.0', 'fill-opacity': '1.0',
'stroke': '#000000', 'stroke-linecap': 'butt',
'fill': 'none'}
return inkex.PathElement(style=str(inkex.Style(sty)), d=self.iterate())
if __name__ == '__main__':
Lindenmayer().run()
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