inner
1
outer
0
single line
0
1
shifted grid
0
1
pair of lines, single polygon
1
0
0
1
0
0
pair of lines, different polygons
complex polygon
0
1
0
1
0
1
polygon with holes
0
1
0
1
0
1
0
1
0
1
0
1
polygons with reversed direction
0
1
0
1
0
1
0
eps for complex polygon in grid
1