Abstract
We present an O(nrG) time algorithm for computing and maintaining a minimum length shortest watchman tour that sees a simple polygon under monotone visibility in direction \(\theta \), while \(\theta \) varies in \([0,180^{\circ })\), obtaining the directions for the tour to be the shortest one over all tours, where n is the number of vertices, r is the number of reflex vertices, and \(G\le r\) is the maximum number of gates of the polygon used at any time in the algorithm.
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