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radiusrand.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 random, math, inkex, cubicsuperpath

def randomize((x, y), r):
      r = random.uniform(0.0,r)
      a = random.uniform(0.0,2*math.pi)
      x += math.cos(a)*r
      y += math.sin(a)*r
      return [x, y]

class RadiusRandomize(inkex.Effect):
      def __init__(self):
            inkex.Effect.__init__(self)
            self.OptionParser.add_option("-r", "--radius",
                                    action="store", type="float", 
                                    dest="radius", default=10.0,
                                    help="Randomly move control and end points in this radius")
            self.OptionParser.add_option("-c", "--ctrl",
                                    action="store", type="inkbool", 
                                    dest="ctrl", default=True,
                                    help="Randomize control points")
            self.OptionParser.add_option("-e", "--end",
                                    action="store", type="inkbool", 
                                    dest="end", default=True,
                                    help="Randomize nodes")
      def effect(self):
            for id, node in self.selected.iteritems():
                  if node.tagName == 'path':
                        d = node.attributes.getNamedItem('d')
                        p = cubicsuperpath.parsePath(d.value)
                        for subpath in p:
                              for csp in subpath:
                                    if self.options.end:
                                          delta=randomize([0,0], self.options.radius)
                                          csp[0][0]+=delta[0] 
                                          csp[0][1]+=delta[1] 
                                          csp[1][0]+=delta[0] 
                                          csp[1][1]+=delta[1] 
                                          csp[2][0]+=delta[0] 
                                          csp[2][1]+=delta[1] 
                                    if self.options.ctrl:
                                          csp[0]=randomize(csp[0], self.options.radius)
                                          csp[2]=randomize(csp[2], self.options.radius)
                        d.value = cubicsuperpath.formatPath(p)

e = RadiusRandomize()
e.affect()


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