Kernel::Orientation_2

Orientation	fo.operator() ( Kernel::Point_2 p, Kernel::Point_2 q, Kernel::Point_2 r)
		returns LEFT_TURN, if $$r lies to the left of the oriented line $$l defined by $$p and $$q, returns RIGHT_TURN if $$r lies to the right of $$l, and returns COLLINEAR if $$r lies on $$l.
Orientation	fo.operator() ( Kernel::Vector_2 u, Kernel::Vector_2 v)
		returns LEFT_TURN if $$u and $$v form a left turn, returns RIGHT_TURN if $$u and $$v form a right turn, and returns COLLINEAR if $$u and $$v are collinear.

Refines

See Also