ceph/src/boost/libs/polygon/example/input_data/polygon/polygon_012.txt

   1 0
   2 12
   3 0 0 100 0
   4 100 0 100 100
   5 100 100 0 100
   6 0 100 0 0
   7 15 15 60 20
   8 60 20 87 23
   9 60 20 57 47
  10 15 85 30 80
  11 30 80 25 65
  12 30 80 60 70
  13 60 70 75 65
  14 60 70 65 85