share/extensions/cspsubdiv.py

   1 #!/usr/bin/env python
   2 from bezmisc import *
   3 from ffgeom import *
   4
   5 def maxdist(((p0x,p0y),(p1x,p1y),(p2x,p2y),(p3x,p3y))):
   6         p0 = Point(p0x,p0y)
   7         p1 = Point(p1x,p1y)
   8         p2 = Point(p2x,p2y)
   9         p3 = Point(p3x,p3y)
  10
  11         s1 = Segment(p0,p3)
  12         return max(s1.distanceToPoint(p1),s1.distanceToPoint(p2))
  13
  14
  15 def cspsubdiv(csp,flat):
  16         for sp in csp:
  17                 subdiv(sp,flat)
  18
  19 def subdiv(sp,flat,i=1):
  20         p0 = sp[i-1][1]
  21         p1 = sp[i-1][2]
  22         p2 = sp[i][0]
  23         p3 = sp[i][1]
  24
  25         b = (p0,p1,p2,p3)
  26         m = maxdist(b)
  27         if m <= flat:
  28                 try:
  29                         subdiv(sp,flat,i+1)
  30                 except IndexError:
  31                         pass
  32         else:
  33                 one, two = beziersplitatt(b,0.5)
  34                 sp[i-1][2] = one[1]
  35                 sp[i][0] = two[2]
  36                 p = [one[2],one[3],two[1]]
  37                 sp[i:1] = [p]
  38                 subdiv(sp,flat,i)
  39