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Python Source  |  2011-07-08  |  10.9 KB  |  282 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. import copy, math, re, random
  37. import gettext
  38. _ = gettext.gettext
  39.  
  40. def flipxy(path):
  41.     for pathcomp in path:
  42.         for ctl in pathcomp:
  43.             for pt in ctl:
  44.                 tmp=pt[0]
  45.                 pt[0]=-pt[1]
  46.                 pt[1]=-tmp
  47.  
  48. def offset(pathcomp,dx,dy):
  49.     for ctl in pathcomp:
  50.         for pt in ctl:
  51.             pt[0]+=dx
  52.             pt[1]+=dy
  53.  
  54. def stretch(pathcomp,xscale,yscale,org):
  55.     for ctl in pathcomp:
  56.         for pt in ctl:
  57.             pt[0]=org[0]+(pt[0]-org[0])*xscale
  58.             pt[1]=org[1]+(pt[1]-org[1])*yscale
  59.  
  60. def linearize(p,tolerance=0.001):
  61.     '''
  62.     This function recieves a component of a 'cubicsuperpath' and returns two things:
  63.     The path subdivided in many straight segments, and an array containing the length of each segment.
  64.     
  65.     We could work with bezier path as well, but bezier arc lengths are (re)computed for each point 
  66.     in the deformed object. For complex paths, this might take a while.
  67.     '''
  68.     zero=0.000001
  69.     i=0
  70.     d=0
  71.     lengths=[]
  72.     while i<len(p)-1:
  73.         box  = bezmisc.pointdistance(p[i  ][1],p[i  ][2])
  74.         box += bezmisc.pointdistance(p[i  ][2],p[i+1][0])
  75.         box += bezmisc.pointdistance(p[i+1][0],p[i+1][1])
  76.         chord = bezmisc.pointdistance(p[i][1], p[i+1][1])
  77.         if (box - chord) > tolerance:
  78.             b1, b2 = bezmisc.beziersplitatt([p[i][1],p[i][2],p[i+1][0],p[i+1][1]], 0.5)
  79.             p[i  ][2][0],p[i  ][2][1]=b1[1]
  80.             p[i+1][0][0],p[i+1][0][1]=b2[2]
  81.             p.insert(i+1,[[b1[2][0],b1[2][1]],[b1[3][0],b1[3][1]],[b2[1][0],b2[1][1]]])
  82.         else:
  83.             d=(box+chord)/2
  84.             lengths.append(d)
  85.             i+=1
  86.     new=[p[i][1] for i in range(0,len(p)-1) if lengths[i]>zero]
  87.     new.append(p[-1][1])
  88.     lengths=[l for l in lengths if l>zero]
  89.     return(new,lengths)
  90.  
  91. class PathAlongPath(pathmodifier.Diffeo):
  92.     def __init__(self):
  93.         pathmodifier.Diffeo.__init__(self)
  94.         self.OptionParser.add_option("--title")
  95.         self.OptionParser.add_option("-n", "--noffset",
  96.                         action="store", type="float", 
  97.                         dest="noffset", default=0.0, help="normal offset")
  98.         self.OptionParser.add_option("-t", "--toffset",
  99.                         action="store", type="float", 
  100.                         dest="toffset", default=0.0, help="tangential offset")
  101.         self.OptionParser.add_option("-k", "--kind",
  102.                         action="store", type="string", 
  103.                         dest="kind", default=True,
  104.                         help="choose between wave or snake effect")
  105.         self.OptionParser.add_option("-c", "--copymode",
  106.                         action="store", type="string", 
  107.                         dest="copymode", default=True,
  108.                         help="repeat the path to fit deformer's length")
  109.         self.OptionParser.add_option("-p", "--space",
  110.                         action="store", type="float", 
  111.                         dest="space", default=0.0)
  112.         self.OptionParser.add_option("-v", "--vertical",
  113.                         action="store", type="inkbool", 
  114.                         dest="vertical", default=False,
  115.                         help="reference path is vertical")
  116.         self.OptionParser.add_option("-d", "--duplicate",
  117.                         action="store", type="inkbool", 
  118.                         dest="duplicate", default=False,
  119.                         help="duplicate pattern before deformation")
  120.  
  121.     def prepareSelectionList(self):
  122.  
  123.         idList=self.options.ids
  124.         idList=pathmodifier.zSort(self.document.getroot(),idList)
  125.         id = idList[-1]
  126.         self.patterns={id:self.selected[id]}
  127.  
  128. ##        ##first selected->pattern, all but first selected-> skeletons
  129. ##        id = self.options.ids[-1]
  130. ##        self.patterns={id:self.selected[id]}
  131.  
  132.         if self.options.duplicate:
  133.             self.patterns=self.duplicateNodes(self.patterns)
  134.         self.expandGroupsUnlinkClones(self.patterns, True, True)
  135.         self.objectsToPaths(self.patterns)
  136.         del self.selected[id]
  137.  
  138.         self.skeletons=self.selected
  139.         self.expandGroupsUnlinkClones(self.skeletons, True, False)
  140.         self.objectsToPaths(self.skeletons)
  141.  
  142.     def lengthtotime(self,l):
  143.         '''
  144.         Recieves an arc length l, and returns the index of the segment in self.skelcomp 
  145.         containing the coresponding point, to gether with the position of the point on this segment.
  146.  
  147.         If the deformer is closed, do computations modulo the toal length.
  148.         '''
  149.         if self.skelcompIsClosed:
  150.             l=l % sum(self.lengths)
  151.         if l<=0:
  152.             return 0,l/self.lengths[0]
  153.         i=0
  154.         while (i<len(self.lengths)) and (self.lengths[i]<=l):
  155.             l-=self.lengths[i]
  156.             i+=1
  157.         t=l/self.lengths[min(i,len(self.lengths)-1)]
  158.         return i, t
  159.  
  160.     def applyDiffeo(self,bpt,vects=()):
  161.         '''
  162.         The kernel of this stuff:
  163.         bpt is a base point and for v in vectors, v'=v-p is a tangent vector at bpt.
  164.         '''
  165.         s=bpt[0]-self.skelcomp[0][0]
  166.         i,t=self.lengthtotime(s)
  167.         if i==len(self.skelcomp)-1:
  168.             x,y=bezmisc.tpoint(self.skelcomp[i-1],self.skelcomp[i],1+t)
  169.             dx=(self.skelcomp[i][0]-self.skelcomp[i-1][0])/self.lengths[-1]
  170.             dy=(self.skelcomp[i][1]-self.skelcomp[i-1][1])/self.lengths[-1]
  171.         else:
  172.             x,y=bezmisc.tpoint(self.skelcomp[i],self.skelcomp[i+1],t)
  173.             dx=(self.skelcomp[i+1][0]-self.skelcomp[i][0])/self.lengths[i]
  174.             dy=(self.skelcomp[i+1][1]-self.skelcomp[i][1])/self.lengths[i]
  175.  
  176.         vx=0
  177.         vy=bpt[1]-self.skelcomp[0][1]
  178.         if self.options.wave:
  179.             bpt[0]=x+vx*dx
  180.             bpt[1]=y+vy+vx*dy
  181.         else:
  182.             bpt[0]=x+vx*dx-vy*dy
  183.             bpt[1]=y+vx*dy+vy*dx
  184.  
  185.         for v in vects:
  186.             vx=v[0]-self.skelcomp[0][0]-s
  187.             vy=v[1]-self.skelcomp[0][1]
  188.             if self.options.wave:
  189.                 v[0]=x+vx*dx
  190.                 v[1]=y+vy+vx*dy
  191.             else:
  192.                 v[0]=x+vx*dx-vy*dy
  193.                 v[1]=y+vx*dy+vy*dx
  194.  
  195.     def effect(self):
  196.         if len(self.options.ids)<2:
  197.             inkex.errormsg(_("This extension requires two selected paths."))
  198.             return
  199.         self.prepareSelectionList()
  200.         self.options.wave = (self.options.kind=="Ribbon")
  201.         if self.options.copymode=="Single":
  202.             self.options.repeat =False
  203.             self.options.stretch=False
  204.         elif self.options.copymode=="Repeated":
  205.             self.options.repeat =True
  206.             self.options.stretch=False
  207.         elif self.options.copymode=="Single, stretched":
  208.             self.options.repeat =False
  209.             self.options.stretch=True
  210.         elif self.options.copymode=="Repeated, stretched":
  211.             self.options.repeat =True
  212.             self.options.stretch=True
  213.  
  214.         bbox=simpletransform.computeBBox(self.patterns.values())
  215.                     
  216.         if self.options.vertical:
  217.             #flipxy(bbox)...
  218.             bbox=(-bbox[3],-bbox[2],-bbox[1],-bbox[0])
  219.             
  220.         width=bbox[1]-bbox[0]
  221.         dx=width+self.options.space
  222.  
  223.         for id, node in self.patterns.iteritems():
  224.             if node.tag == inkex.addNS('path','svg') or node.tag=='path':
  225.                 d = node.get('d')
  226.                 p0 = cubicsuperpath.parsePath(d)
  227.                 if self.options.vertical:
  228.                     flipxy(p0)
  229.  
  230.                 newp=[]
  231.                 for skelnode in self.skeletons.itervalues(): 
  232.                     self.curSekeleton=cubicsuperpath.parsePath(skelnode.get('d'))
  233.                     if self.options.vertical:
  234.                         flipxy(self.curSekeleton)
  235.                     for comp in self.curSekeleton:
  236.                         p=copy.deepcopy(p0)
  237.                         self.skelcomp,self.lengths=linearize(comp)
  238.                         #!!!!>----> TODO: really test if path is closed! end point==start point is not enough!
  239.                         self.skelcompIsClosed = (self.skelcomp[0]==self.skelcomp[-1])
  240.  
  241.                         length=sum(self.lengths)
  242.                         xoffset=self.skelcomp[0][0]-bbox[0]+self.options.toffset
  243.                         yoffset=self.skelcomp[0][1]-(bbox[2]+bbox[3])/2-self.options.noffset
  244.  
  245.  
  246.                         if self.options.repeat:
  247.                             NbCopies=max(1,int(round((length+self.options.space)/dx)))
  248.                             width=dx*NbCopies
  249.                             if not self.skelcompIsClosed:
  250.                                 width-=self.options.space
  251.                             bbox=bbox[0],bbox[0]+width, bbox[2],bbox[3]
  252.                             new=[]
  253.                             for sub in p:
  254.                                 for i in range(0,NbCopies,1):
  255.                                     new.append(copy.deepcopy(sub))
  256.                                     offset(sub,dx,0)
  257.                             p=new
  258.  
  259.                         for sub in p:
  260.                             offset(sub,xoffset,yoffset)
  261.  
  262.                         if self.options.stretch:
  263.                             for sub in p:
  264.                                 stretch(sub,length/width,1,self.skelcomp[0])
  265.  
  266.                         for sub in p:
  267.                             for ctlpt in sub:
  268.                                 self.applyDiffeo(ctlpt[1],(ctlpt[0],ctlpt[2]))
  269.  
  270.                         if self.options.vertical:
  271.                             flipxy(p)
  272.                         newp+=p
  273.  
  274.                 node.set('d', cubicsuperpath.formatPath(newp))
  275.  
  276. if __name__ == '__main__':
  277.     e = PathAlongPath()
  278.     e.affect()
  279.  
  280.                     
  281. # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
  282.