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Python Source  |  2005-09-20  |  3.7 KB  |  120 lines
  1. #!/usr/bin/env python 
  2. '''
  3. Copyright (C) 2005 Aaron Spike, aaron@ekips.org
  4.  
  5. This program is free software; you can redistribute it and/or modify
  6. it under the terms of the GNU General Public License as published by
  7. the Free Software Foundation; either version 2 of the License, or
  8. (at your option) any later version.
  9.  
  10. This program is distributed in the hope that it will be useful,
  11. but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13. GNU General Public License for more details.
  14.  
  15. You should have received a copy of the GNU General Public License
  16. along with this program; if not, write to the Free Software
  17. Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18. '''
  19. import math, inkex, simplestyle, simplepath, bezmisc
  20.  
  21. class Motion(inkex.Effect):
  22.     def __init__(self):
  23.         inkex.Effect.__init__(self)
  24.         self.OptionParser.add_option("-a", "--angle",
  25.                         action="store", type="float", 
  26.                         dest="angle", default=45.0,
  27.                         help="direction of the motion vector")
  28.         self.OptionParser.add_option("-m", "--magnitude",
  29.                         action="store", type="float", 
  30.                         dest="magnitude", default=100.0,
  31.                         help="magnitude of the motion vector")    
  32.  
  33.     def makeface(self,last,(cmd, params)):
  34.         a = []
  35.         a.append(['M',last[:]])
  36.         a.append([cmd, params[:]])
  37.  
  38.         #translate path segment along vector
  39.         np = params[:]
  40.         defs = simplepath.pathdefs[cmd]
  41.         for i in range(defs[1]):
  42.             if defs[3][i] == 'x':
  43.                 np[i] += self.vx
  44.             elif defs[3][i] == 'y':
  45.                 np[i] += self.vy
  46.  
  47.         a.append(['L',[np[-2],np[-1]]])
  48.         
  49.         #reverse direction of path segment
  50.         np[-2:] = last[0]+self.vx,last[1]+self.vy
  51.         if cmd == 'C':
  52.             c1 = np[:2], np[2:4] = np[2:4], np[:2]
  53.         a.append([cmd,np[:]])
  54.             
  55.         a.append(['Z',[]])
  56.         face = self.document.createElement('svg:path')
  57.         self.facegroup.appendChild(face)
  58.         face.setAttribute('d', simplepath.formatPath(a))
  59.         
  60.         
  61.     def effect(self):
  62.         self.vx = math.cos(math.radians(self.options.angle))*self.options.magnitude
  63.         self.vy = math.sin(math.radians(self.options.angle))*self.options.magnitude
  64.         for id, node in self.selected.iteritems():
  65.             if node.tagName == 'path':
  66.                 group = self.document.createElement('svg:g')
  67.                 self.facegroup = self.document.createElement('svg:g')
  68.                 node.parentNode.appendChild(group)
  69.                 group.appendChild(self.facegroup)
  70.                 group.appendChild(node)
  71.                 
  72.                 try:
  73.                     t = node.attributes.getNamedItem('transform').value
  74.                     group.setAttribute('transform', t)
  75.                     node.attributes.getNamedItem('transform').value=""
  76.                 except AttributeError:
  77.                     pass
  78.  
  79.                 s = node.attributes.getNamedItem('style').value
  80.                 self.facegroup.setAttribute('style', s)
  81.  
  82.                 p = simplepath.parsePath(node.attributes.getNamedItem('d').value)
  83.                 for cmd,params in p:
  84.                     tees = []
  85.                     if cmd == 'C':
  86.                         bez = (last,params[:2],params[2:4],params[-2:])
  87.                         tees = [t for t in bezmisc.beziertatslope(bez,(self.vy,self.vx)) if 0<t<1]
  88.                         tees.sort()
  89.  
  90.                     segments = []
  91.                     if len(tees) == 0 and cmd in ['L','C']:
  92.                             segments.append([cmd,params[:]])
  93.                     elif len(tees) == 1:
  94.                             one,two = bezmisc.beziersplitatt(bez,tees[0])
  95.                             segments.append([cmd,list(one[1]+one[2]+one[3])])
  96.                             segments.append([cmd,list(two[1]+two[2]+two[3])])
  97.                     elif len(tees) == 2:
  98.                             one,two = bezmisc.beziersplitatt(bez,tees[0])
  99.                             two,three = bezmisc.beziersplitatt(two,tees[1])
  100.                             segments.append([cmd,list(one[1]+one[2]+one[3])])
  101.                             segments.append([cmd,list(two[1]+two[2]+two[3])])
  102.                             segments.append([cmd,list(three[1]+three[2]+three[3])])
  103.  
  104.                     for seg in segments:
  105.                         self.makeface(last,seg)
  106.                         last = seg[1][-2:]
  107.                     
  108.                     if cmd == 'M':
  109.                         subPathStart = params[-2:]
  110.                     if cmd == 'Z':
  111.                         last = subPathStart
  112.                     else:
  113.                         last = params[-2:]
  114.  
  115.  
  116.                 
  117.  
  118. e = Motion()
  119. e.affect()
  120.