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kochify.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 math, tempfile, copy, cPickle, inkex, simplepath

def findend(d):
      end = []
      subPathStart = []
      for cmd,params in d:
            if cmd == 'M':
                  subPathStart = params[-2:]
            if cmd == 'Z':
                  end = subPathStart[:]
            else:
                  end = params[-2:]
      return end

class Kochify(inkex.Effect):
      def effect(self):
            try:
                  f = open(tempfile.gettempdir() + '/kochify.bin', 'r')
                  proto = cPickle.load(f)
                  f.close()                     
            except:
                  return False
            for id, node in self.selected.iteritems():
                  if node.tagName == 'path':
                        d = node.attributes.getNamedItem('d')
                        p = simplepath.parsePath(d.value)
                        last = p[0][1][-2:]
                        subPathStart = []
                        cur = []
                        new = []
                        for i in range(len(p)):
                              rep = copy.deepcopy(proto['path'])
                              cmd, params = p[i]
                              if cmd == 'M':
                                    subPathStart = params[-2:]
                                    new.append(copy.deepcopy(p[i]))
                                    continue
                              if cmd == 'Z':
                                    cur = subPathStart[:]
                              else:
                                    cur = params[-2:]

                              if last == cur:
                                    continue

                              dx = cur[0]-last[0]
                              dy = cur[1]-last[1]
                              length = math.sqrt((dx**2) + (dy**2))
                              angle = math.atan2(dy,dx)
            
                              scale = length / proto['length']
                              rotate = angle - proto['angle']
                              simplepath.scalePath(rep,scale,scale)
                              simplepath.rotatePath(rep, rotate)
                              repend = findend(rep)
                              transx = cur[0] - repend[0]
                              transy = cur[1] - repend[1]
                              simplepath.translatePath(rep, transx, transy)
                              
                              if proto['endsinz']:
                                    new.extend(rep[:])
                              else:
                                    new.extend(rep[1:])
                              last = cur[:]
                        
                        d.value = simplepath.formatPath(new)
e = Kochify()
e.affect()

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