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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, norm):
    if norm:
        r = abs(random.normalvariate(0.0,0.5*r))
    else:
        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("--title")
        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")
        self.OptionParser.add_option("-n", "--norm",
                        action="store", type="inkbool", 
                        dest="norm", default=True,
                        help="Use normal distribution")
    def effect(self):
        for id, node in self.selected.iteritems():
            if node.tag == inkex.addNS('path','svg'):
                d = node.get('d')
                p = cubicsuperpath.parsePath(d)
                for subpath in p:
                    for csp in subpath:
                        if self.options.end:
                            delta=randomize([0,0], self.options.radius, self.options.norm)
                            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, self.options.norm)
                            csp[2]=randomize(csp[2], self.options.radius, self.options.norm)
                node.set('d',cubicsuperpath.formatPath(p))

e = RadiusRandomize()
e.affect()


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