manual/radii2.py

   1 from pyx import *
   2 c = canvas.canvas()
   3
   4 circle = path.circle(0, 0, 2)
   5 line = path.line(-3, 1, 3, 2)
   6
   7 isects_circle, isects_line = circle.intersect(line)
   8
   9 arc1, arc2 = circle.split(isects_circle)
  10
  11 arc = arc1.arclen()<arc2.arclen() and arc1 or arc2
  12
  13 isects_line.sort()
  14 line1, line2, line3 = line.split(isects_line)
  15
  16 segment = line2 << arc
  17
  18 c.fill(segment, [color.grey(0.5)])
  19
  20 c.stroke(circle, [style.linewidth.Thick])
  21 c.stroke(line, [style.linewidth.Thick])
  22
  23 for isect in isects_circle:
  24     c.stroke(path.line(0, 0, *circle.at(isect)))
  25
  26 c.writePDFfile()