#!/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 math, inkex, cubicsuperpath

class Whirl(inkex.Effect):
	def __init__(self):
		inkex.Effect.__init__(self)
		self.OptionParser.add_option("-x", "--centerx",
						action="store", type="float", 
						dest="centerx", default=10.0,
						help="")
		self.OptionParser.add_option("-y", "--centery",
						action="store", type="float", 
						dest="centery", default=0.0,
						help="")
		self.OptionParser.add_option("-t", "--whirl",
						action="store", type="float", 
						dest="whirl", default=1.0,
						help="amount of whirl")
		self.OptionParser.add_option("-r", "--rotation",
						action="store", type="inkbool", 
						dest="rotation", default=True,
						help="direction of rotation")
	def effect(self):
		for id, node in self.selected.iteritems():
			rotation = -1
			if self.options.rotation == True:
				rotation = 1
			whirl = self.options.whirl / 1000
			if node.tagName == 'path':
				d = node.attributes.getNamedItem('d')
				p = cubicsuperpath.parsePath(d.value)
				for sub in p:
					for csp in sub:
						for point in csp:
							point[0] -= self.options.centerx
							point[1] -= self.options.centery
							dist = math.sqrt((point[0] ** 2) + (point[1] ** 2))
							if dist != 0:
								a = rotation * dist * whirl
                                        			theta = math.atan2(point[1], point[0]) + a
			                                        point[0] = (dist * math.cos(theta))
 			                                        point[1] = (dist * math.sin(theta))
							point[0] += self.options.centerx
							point[1] += self.options.centery
				d.value = cubicsuperpath.formatPath(p)

e = Whirl()
e.affect()
