FillRule

Used to select how paths are filled. For both fill rules, whether or not a point is included in the fill is determined by taking a ray from that point to infinity, and looking at intersections with the path. The ray can be in any direction as long as it doesn't pass through the end point of a segment, or have a tricky intersection such as intersecting tangent to the path. Note that filling is not actually implemented in this way. This is just a description of the rule that is applied.

The default fill rule is WINDING.