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
  40
  41 # vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99