php man page for cairofillrule

CAIROFILLRULE(3)							 1							  CAIROFILLRULE(3)

The CairoFillRule class

INTRODUCTION
	A  CairoFillRule is 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 CairoFillRule::WINDING.

CLASS SYNOPSIS
       CairoFillRule

       CairoFillRule

       Constants

       o const integer$CairoFillRule::WINDING0

       o const integer$CairoFillRule::EVEN_ODD1

PREDEFINED CONSTANTS
	      o CairoFillRule::WINDING -If the path crosses the ray from left-to-right, counts +1. If the path crosses the ray from right to left,
		counts	-1.  (Left  and  right are determined from the perspective of looking along the ray from the starting point.) If the total
		count is non-zero, the point will be filled.

	      o CairoFillRule::EVEN_ODD -Counts the total number of intersections, without regard to the orientation of the contour. If the  total
		number of intersections is odd, the point will be filled.

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