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Python Source  |  2011-07-08  |  10.2 KB  |  264 lines
  1. #!/usr/bin/env python
  2. '''
  3. Copyright (C) 2006 Jean-Francois Barraud, barraud@math.univ-lille1.fr
  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. barraud@math.univ-lille1.fr
  19.  
  20. Quick description:
  21. This script deforms an object (the pattern) along other paths (skeletons)...
  22. The first selected object is the pattern
  23. the last selected ones are the skeletons.
  24.  
  25. Imagine a straight horizontal line L in the middle of the bounding box of the pattern.
  26. Consider the normal bundle of L: the collection of all the vertical lines meeting L.
  27. Consider this as the initial state of the plane; in particular, think of the pattern
  28. as painted on these lines.
  29.  
  30. Now move and bend L to make it fit a skeleton, and see what happens to the normals:
  31. they move and rotate, deforming the pattern.
  32. '''
  33.  
  34. import inkex, cubicsuperpath, bezmisc
  35. import pathmodifier, simpletransform 
  36. from lxml import etree
  37. import copy, math, re, random
  38. import gettext
  39. _ = gettext.gettext
  40.  
  41. def zSort(inNode,idList):
  42.     sortedList=[]
  43.     theid = inNode.get("id")
  44.     if theid in idList:
  45.         sortedList.append(theid)
  46.     for child in inNode:
  47.         if len(sortedList)==len(idList):
  48.             break
  49.         sortedList+=zSort(child,idList)
  50.     return sortedList
  51.             
  52.  
  53. def flipxy(path):
  54.     for pathcomp in path:
  55.         for ctl in pathcomp:
  56.             for pt in ctl:
  57.                 tmp=pt[0]
  58.                 pt[0]=-pt[1]
  59.                 pt[1]=-tmp
  60.  
  61. def offset(pathcomp,dx,dy):
  62.     for ctl in pathcomp:
  63.         for pt in ctl:
  64.             pt[0]+=dx
  65.             pt[1]+=dy
  66.  
  67. def stretch(pathcomp,xscale,yscale,org):
  68.     for ctl in pathcomp:
  69.         for pt in ctl:
  70.             pt[0]=org[0]+(pt[0]-org[0])*xscale
  71.             pt[1]=org[1]+(pt[1]-org[1])*yscale
  72.  
  73. def linearize(p,tolerance=0.001):
  74.     '''
  75.     This function recieves a component of a 'cubicsuperpath' and returns two things:
  76.     The path subdivided in many straight segments, and an array containing the length of each segment.
  77.     
  78.     We could work with bezier path as well, but bezier arc lengths are (re)computed for each point 
  79.     in the deformed object. For complex paths, this might take a while.
  80.     '''
  81.     zero=0.000001
  82.     i=0
  83.     d=0
  84.     lengths=[]
  85.     while i<len(p)-1:
  86.         box  = bezmisc.pointdistance(p[i  ][1],p[i  ][2])
  87.         box += bezmisc.pointdistance(p[i  ][2],p[i+1][0])
  88.         box += bezmisc.pointdistance(p[i+1][0],p[i+1][1])
  89.         chord = bezmisc.pointdistance(p[i][1], p[i+1][1])
  90.         if (box - chord) > tolerance:
  91.             b1, b2 = bezmisc.beziersplitatt([p[i][1],p[i][2],p[i+1][0],p[i+1][1]], 0.5)
  92.             p[i  ][2][0],p[i  ][2][1]=b1[1]
  93.             p[i+1][0][0],p[i+1][0][1]=b2[2]
  94.             p.insert(i+1,[[b1[2][0],b1[2][1]],[b1[3][0],b1[3][1]],[b2[1][0],b2[1][1]]])
  95.         else:
  96.             d=(box+chord)/2
  97.             lengths.append(d)
  98.             i+=1
  99.     new=[p[i][1] for i in range(0,len(p)-1) if lengths[i]>zero]
  100.     new.append(p[-1][1])
  101.     lengths=[l for l in lengths if l>zero]
  102.     return(new,lengths)
  103.  
  104. class PathScatter(pathmodifier.Diffeo):
  105.     def __init__(self):
  106.         pathmodifier.Diffeo.__init__(self)
  107.         self.OptionParser.add_option("--title")
  108.         self.OptionParser.add_option("-n", "--noffset",
  109.                         action="store", type="float", 
  110.                         dest="noffset", default=0.0, help="normal offset")
  111.         self.OptionParser.add_option("-t", "--toffset",
  112.                         action="store", type="float", 
  113.                         dest="toffset", default=0.0, help="tangential offset")
  114.         self.OptionParser.add_option("-f", "--follow",
  115.                         action="store", type="inkbool", 
  116.                         dest="follow", default=True,
  117.                         help="choose between wave or snake effect")
  118.         self.OptionParser.add_option("-s", "--stretch",
  119.                         action="store", type="inkbool", 
  120.                         dest="stretch", default=True,
  121.                         help="repeat the path to fit deformer's length")
  122.         self.OptionParser.add_option("-p", "--space",
  123.                         action="store", type="float", 
  124.                         dest="space", default=0.0)
  125.         self.OptionParser.add_option("-v", "--vertical",
  126.                         action="store", type="inkbool", 
  127.                         dest="vertical", default=False,
  128.                         help="reference path is vertical")
  129.         self.OptionParser.add_option("-d", "--duplicate",
  130.                         action="store", type="inkbool", 
  131.                         dest="duplicate", default=False,
  132.                         help="duplicate pattern before deformation")
  133.         self.OptionParser.add_option("-c", "--copymode",
  134.                         action="store", type="string", 
  135.                         dest="copymode", default="clone",
  136.                         help="duplicate pattern before deformation")
  137.  
  138.     def prepareSelectionList(self):
  139.  
  140.         idList=self.options.ids
  141.         idList=zSort(self.document.getroot(),idList)
  142.                 
  143.         ##first selected->pattern, all but first selected-> skeletons
  144.         #id = self.options.ids[-1]
  145.         id = idList[-1]
  146.         self.patternNode=self.selected[id]
  147.  
  148.         self.gNode = etree.Element('{http://www.w3.org/2000/svg}g')
  149.         self.patternNode.getparent().append(self.gNode)
  150.  
  151.         if self.options.copymode=="copy":
  152.             duplist=self.duplicateNodes({id:self.patternNode})
  153.             self.patternNode = duplist.values()[0]
  154.  
  155.         #TODO: allow 4th option: duplicate the first copy and clone the next ones.
  156.         if "%s"%self.options.copymode=="clone":
  157.             self.patternNode = etree.Element('{http://www.w3.org/2000/svg}use')
  158.             self.patternNode.set('{http://www.w3.org/1999/xlink}href',"#%s"%id)
  159.             self.gNode.append(self.patternNode)
  160.  
  161.         self.skeletons=self.selected
  162.         del self.skeletons[id]
  163.         self.expandGroupsUnlinkClones(self.skeletons, True, False)
  164.         self.objectsToPaths(self.skeletons,False)
  165.  
  166.     def lengthtotime(self,l):
  167.         '''
  168.         Recieves an arc length l, and returns the index of the segment in self.skelcomp 
  169.         containing the coresponding point, to gether with the position of the point on this segment.
  170.  
  171.         If the deformer is closed, do computations modulo the toal length.
  172.         '''
  173.         if self.skelcompIsClosed:
  174.             l=l % sum(self.lengths)
  175.         if l<=0:
  176.             return 0,l/self.lengths[0]
  177.         i=0
  178.         while (i<len(self.lengths)) and (self.lengths[i]<=l):
  179.             l-=self.lengths[i]
  180.             i+=1
  181.         t=l/self.lengths[min(i,len(self.lengths)-1)]
  182.         return i, t
  183.  
  184.     def localTransformAt(self,s,follow=True):
  185.         '''
  186.         recieves a length, and returns the coresponding point and tangent of self.skelcomp
  187.         if follow is set to false, returns only the translation
  188.         '''
  189.         i,t=self.lengthtotime(s)
  190.         if i==len(self.skelcomp)-1:
  191.             x,y=bezmisc.tpoint(self.skelcomp[i-1],self.skelcomp[i],1+t)
  192.             dx=(self.skelcomp[i][0]-self.skelcomp[i-1][0])/self.lengths[-1]
  193.             dy=(self.skelcomp[i][1]-self.skelcomp[i-1][1])/self.lengths[-1]
  194.         else:
  195.             x,y=bezmisc.tpoint(self.skelcomp[i],self.skelcomp[i+1],t)
  196.             dx=(self.skelcomp[i+1][0]-self.skelcomp[i][0])/self.lengths[i]
  197.             dy=(self.skelcomp[i+1][1]-self.skelcomp[i][1])/self.lengths[i]
  198.         if follow:
  199.             mat=[[dx,-dy,x],[dy,dx,y]]
  200.         else:
  201.             mat=[[1,0,x],[0,1,y]]
  202.         return mat
  203.  
  204.  
  205.     def effect(self):
  206.  
  207.         if len(self.options.ids)<2:
  208.             inkex.errormsg(_("This extension requires two selected paths."))
  209.             return
  210.         self.prepareSelectionList()
  211.  
  212.         #center at (0,0)
  213.         bbox=pathmodifier.computeBBox([self.patternNode])
  214.         mat=[[1,0,-(bbox[0]+bbox[1])/2],[0,1,-(bbox[2]+bbox[3])/2]]
  215.         if self.options.vertical:
  216.             bbox=[-bbox[3],-bbox[2],bbox[0],bbox[1]]
  217.             mat=simpletransform.composeTransform([[0,-1,0],[1,0,0]],mat)
  218.         mat[1][2] += self.options.noffset
  219.         simpletransform.applyTransformToNode(mat,self.patternNode)
  220.                 
  221.         width=bbox[1]-bbox[0]
  222.         dx=width+self.options.space
  223.  
  224.         for skelnode in self.skeletons.itervalues(): 
  225.             self.curSekeleton=cubicsuperpath.parsePath(skelnode.get('d'))
  226.             for comp in self.curSekeleton:
  227.                 self.skelcomp,self.lengths=linearize(comp)
  228.                 #!!!!>----> TODO: really test if path is closed! end point==start point is not enough!
  229.                 self.skelcompIsClosed = (self.skelcomp[0]==self.skelcomp[-1])
  230.  
  231.                 length=sum(self.lengths)
  232.                 if self.options.stretch:
  233.                     dx=width+self.options.space
  234.                     n=int((length-self.options.toffset+self.options.space)/dx)
  235.                     if n>0:
  236.                         dx=(length-self.options.toffset)/n
  237.  
  238.  
  239.                 xoffset=self.skelcomp[0][0]-bbox[0]+self.options.toffset
  240.                 yoffset=self.skelcomp[0][1]-(bbox[2]+bbox[3])/2-self.options.noffset
  241.  
  242.                 s=self.options.toffset
  243.                 while s<=length:
  244.                     mat=self.localTransformAt(s,self.options.follow)
  245.  
  246.                     clone=copy.deepcopy(self.patternNode)
  247.                     #!!!--> should it be given an id?
  248.                     #seems to work without this!?!
  249.                     myid = self.patternNode.tag.split('}')[-1]
  250.                     clone.set("id", self.uniqueId(myid))
  251.                     self.gNode.append(clone)
  252.                     
  253.                     simpletransform.applyTransformToNode(mat,clone)
  254.  
  255.                     s+=dx
  256.         self.patternNode.getparent().remove(self.patternNode)
  257.  
  258. if __name__ == '__main__':
  259.     e = PathScatter()
  260.     e.affect()
  261.  
  262.  
  263. # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
  264.