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Text File  |  2011-07-08  |  5KB  |  125 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. """
  20. import inkex, os, simplepath, cubicsuperpath
  21. from ffgeom import *
  22. import gettext
  23. _ = gettext.gettext
  24.  
  25. try:
  26.     from subprocess import Popen, PIPE
  27.     bsubprocess = True
  28. except:
  29.     bsubprocess = False
  30.  
  31. class Project(inkex.Effect):
  32.     def __init__(self):
  33.             inkex.Effect.__init__(self)
  34.     def effect(self):
  35.         if len(self.options.ids) < 2:
  36.             inkex.errormsg(_("This extension requires two selected paths. \nThe second path must be exactly four nodes long."))
  37.             exit()
  38.  
  39.         #obj is selected second
  40.         obj = self.selected[self.options.ids[0]]
  41.         trafo = self.selected[self.options.ids[1]]
  42.         if obj.get(inkex.addNS('type','sodipodi')):
  43.             inkex.errormsg(_("The first selected object is of type '%s'.\nTry using the procedure Path->Object to Path." % obj.get(inkex.addNS('type','sodipodi'))))
  44.             exit()
  45.         if obj.tag == inkex.addNS('path','svg') or obj.tag == inkex.addNS('g','svg'):
  46.             if trafo.tag == inkex.addNS('path','svg'):
  47.                 #distil trafo into four node points
  48.                 trafo = cubicsuperpath.parsePath(trafo.get('d'))
  49.                 if len(trafo[0]) < 4:
  50.                     inkex.errormsg(_("This extension requires that the second selected path be four nodes long."))
  51.                     exit()
  52.                 trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]
  53.  
  54.                 #vectors pointing away from the trafo origin
  55.                 self.t1 = Segment(trafo[0],trafo[1])
  56.                 self.t2 = Segment(trafo[1],trafo[2])
  57.                 self.t3 = Segment(trafo[3],trafo[2])
  58.                 self.t4 = Segment(trafo[0],trafo[3])
  59.  
  60.                 #query inkscape about the bounding box of obj
  61.                 self.q = {'x':0,'y':0,'width':0,'height':0}
  62.                 file = self.args[-1]
  63.                 id = self.options.ids[0]
  64.                 for query in self.q.keys():
  65.                     if bsubprocess:
  66.                         p = Popen('inkscape --query-%s --query-id=%s "%s"' % (query,id,file), shell=True, stdout=PIPE, stderr=PIPE)
  67.                         rc = p.wait()
  68.                         self.q[query] = float(p.stdout.read())
  69.                         err = p.stderr.read()
  70.                     else:
  71.                         f,err = os.popen3('inkscape --query-%s --query-id=%s "%s"' % (query,id,file))[1:]
  72.                         self.q[query] = float(f.read())
  73.                         f.close()
  74.                         err.close()
  75.  
  76.                 if obj.tag == inkex.addNS("path",'svg'):
  77.                     self.process_path(obj)
  78.                 if obj.tag == inkex.addNS("g",'svg'):
  79.                     self.process_group(obj)
  80.             else:
  81.                 if trafo.tag == inkex.addNS('g','svg'):
  82.                     inkex.errormsg(_("The second selected object is a group, not a path.\nTry using the procedure Object->Ungroup."))
  83.                 else:
  84.                     inkex.errormsg(_("The second selected object is not a path.\nTry using the procedure Path->Object to Path."))
  85.                 exit()
  86.         else:
  87.             inkex.errormsg(_("The first selected object is not a path.\nTry using the procedure Path->Object to Path."))
  88.             exit()
  89.  
  90.     def process_group(self,group):
  91.         for node in group:
  92.             if node.tag == inkex.addNS('path','svg'):
  93.                 self.process_path(node)
  94.             if node.tag == inkex.addNS('g','svg'):
  95.                 self.process_group(node)
  96.  
  97.     def process_path(self,path):
  98.         d = path.get('d')
  99.         p = cubicsuperpath.parsePath(d)
  100.         for subs in p:
  101.             for csp in subs:
  102.                 csp[0] = self.trafopoint(csp[0])
  103.                 csp[1] = self.trafopoint(csp[1])
  104.                 csp[2] = self.trafopoint(csp[2])
  105.         path.set('d',cubicsuperpath.formatPath(p))
  106.  
  107.     def trafopoint(self,(x,y)):
  108.         #Transform algorithm thanks to Jose Hevia (freon)
  109.         vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))
  110.         xratio = abs(vector.delta_x())/self.q['width']
  111.         yratio = abs(vector.delta_y())/self.q['height']
  112.     
  113.         horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))
  114.         vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))
  115.  
  116.         p = intersectSegments(vert,horz)
  117.         return [p['x'],p['y']]    
  118.  
  119. if __name__ == '__main__':
  120.     e = Project()
  121.     e.affect()
  122.  
  123.  
  124. # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
  125.