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Abstract We show that a transitively reduced digraph has a confluent upward drawing if and only if its reachability relation has order dimension at most two. In this case, we construct a confluent upward drawing with O(n2) features, in an O(n) ×O(n) grid in O(n2) time. For the digraphs representing series-parallel partial orders we show how to construct a drawing with O(n) features in an O(n) ×O(n) grid in O(n) time from a series-parallel decomposition of the partial order. Our drawings are optimal in the number of confluent junctions they use.
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Submitted: April 2013.
Reviewed: July 2013.
Revised: November 2013.
Accepted: November 2013.
Final: November 2013.
Published: November 2013.
Communicated by
Antonios Symvonis
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