Monotone drawings of graphs with fixed embedding

  • Authors:
  • Patrizio Angelini;Walter Didimo;Stephen Kobourov;Tamara Mchedlidze;Vincenzo Roselli;Antonios Symvonis;Stephen Wismath

  • Affiliations:
  • Università Roma Tre, Italy;Università degli Studi di Perugia, Italy;University of Arizona;National Technical University of Athens, Greece;Università Roma Tre, Italy;National Technical University of Athens, Greece;University of Lethbridge, Canada

  • Venue:
  • GD'11 Proceedings of the 19th international conference on Graph Drawing
  • Year:
  • 2011

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Abstract

A drawing of a graph is a monotone drawing if for every pair of vertices u and v, there is a path drawn from u to v that is monotone in some direction. In this paper we investigate planar monotone drawings in the fixed embedding setting, i.e., a planar embedding of the graph is given as part of the input that must be preserved by the drawing algorithm. In this setting we prove that every planar graph on n vertices admits a planar monotone drawing with at most two bends per edge and with at most 4n --- 10 bends in total; such a drawing can be computed in linear time and requires polynomial area. We also show that two bends per edge are sometimes necessary on a linear number of edges of the graph. Furthermore, we investigate subclasses of planar graphs that can be realized as embedding-preserving monotone drawings with straight-line edges, and we show that biconnected embedded planar graphs and outerplane graphs always admit such drawings, which can be computed in linear time.