jkulesza

# Chan's Convex Hull O(n log h) - Tom Switzer <[email protected]>

TURN_LEFT, TURN_RIGHT, TURN_NONE = (1, -1, 0)

def turn(p, q, r):
    """Returns -1, 0, 1 if p,q,r forms a right, straight, or left turn."""
    return cmp((q[0] - p[0])*(r[1] - p[1]) - (r[0] - p[0])*(q[1] - p[1]), 0)

def _keep_left(hull, r):
    while len(hull) > 1 and turn(hull[-2], hull[-1], r) != TURN_LEFT:

jkulesza

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