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| 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. | ||