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Python Source  |  2005-11-10  |  3.5 KB  |  100 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, re, simplepath, cubicsuperpath
  21. from ffgeom import *
  22.  
  23. uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'pc':15.0}
  24. def unittouu(string):
  25.     unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
  26.     param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
  27.  
  28.     p = param.match(string)
  29.     u = unit.search(string)    
  30.     if p:
  31.         retval = float(p.string[p.start():p.end()])
  32.     else:
  33.         retval = 0.0
  34.     if u:
  35.         try:
  36.             return retval * uuconv[u.string[u.start():u.end()]]
  37.         except KeyError:
  38.             pass
  39.     return retval
  40.  
  41. class Project(inkex.Effect):
  42.         def __init__(self):
  43.                 inkex.Effect.__init__(self)
  44.         def effect(self):
  45.             if len(self.options.ids) < 2:
  46.                 inkex.debug("Requires two selected paths. The second must be exctly four nodes long.")
  47.                 sys.exit()
  48.             
  49.             #obj is selected second
  50.             obj = self.selected[self.options.ids[0]]
  51.             trafo = self.selected[self.options.ids[1]]
  52.                         if obj.tagName == 'path' and trafo.tagName == 'path':
  53.                 #distil trafo into four node points
  54.                 trafo = cubicsuperpath.parsePath(trafo.attributes.getNamedItem('d').value)
  55.                 trafo = [[Point(csp[1][0],csp[1][1]) for csp in subs] for subs in trafo][0][:4]
  56.  
  57.                 #vectors pointing away from the trafo origin
  58.                 self.t1 = Segment(trafo[0],trafo[1])
  59.                 self.t2 = Segment(trafo[1],trafo[2])
  60.                 self.t3 = Segment(trafo[3],trafo[2])
  61.                 self.t4 = Segment(trafo[0],trafo[3])
  62.     
  63.                 #query inkscape about the bounding box of obj
  64.                 self.q = {'x':0,'y':0,'width':0,'height':0}
  65.                 file = self.args[-1]
  66.                 id = self.options.ids[0]
  67.                 for query in self.q.keys():
  68.                     f = os.popen("inkscape --query-%s --query-id=%s %s" % (query,id,file))
  69.                     self.q[query] = float(f.read())
  70.                     f.close()
  71.                 #glean document height from the SVG
  72.                 docheight = unittouu(inkex.xml.xpath.Evaluate('/svg/@height',self.document)[0].value)
  73.                 #Flip inkscapes transposed renderer coords
  74.                 self.q['y'] = docheight - self.q['y'] - self.q['height']
  75.  
  76.                 #process path
  77.                 d = obj.attributes.getNamedItem('d')
  78.                                 p = cubicsuperpath.parsePath(d.value)
  79.                 for subs in p:
  80.                     for csp in subs:
  81.                         csp[0] = self.trafopoint(csp[0])
  82.                         csp[1] = self.trafopoint(csp[1])
  83.                         csp[2] = self.trafopoint(csp[2])
  84.                                 d.value = cubicsuperpath.formatPath(p)
  85.  
  86.     def trafopoint(self,(x,y)):
  87.         #Transform algorithm thanks to Jose Hevia (freon)
  88.         vector = Segment(Point(self.q['x'],self.q['y']),Point(x,y))
  89.         xratio = abs(vector.delta_x())/self.q['width']
  90.         yratio = abs(vector.delta_y())/self.q['height']
  91.     
  92.         horz = Segment(self.t1.pointAtRatio(xratio),self.t3.pointAtRatio(xratio))
  93.         vert = Segment(self.t4.pointAtRatio(yratio),self.t2.pointAtRatio(yratio))
  94.  
  95.         p = intersectSegments(vert,horz)
  96.         return [p['x'],p['y']]    
  97.  
  98. e = Project()
  99. e.affect()
  100.