Tests if a point is Left|On|Right of an infinite line Returns: > 0 : P2 is left of the line through P0, P1 = 0 : P2 is on the line < 0 : P2 is right of the line through P0, P1
1 | isLeft(p0x, p0y, p1x, p1y, p2x, p2y)
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