On planar polyline drawings

  • Authors:
  • Huaming Zhang;Sadish Sadasivam

  • Affiliations:
  • Computer Science Department, University of Alabama in Huntsville, Huntsville, AL;Computer Science Department, University of Alabama in Huntsville, Huntsville, AL

  • Venue:
  • GD'07 Proceedings of the 15th international conference on Graph drawing
  • Year:
  • 2007

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Abstract

We present a linear time algorithm that produces a planar polyline drawing for a plane graph with n vertices in a grid of size bounded by (p + 1) × (n - 2), where p ≤ (⌊2n-5/3⌋). It uses at most p ≤ ⌊2n-5/3⌋ bends, and each edge uses at most one bend. Compared with the area optimal polyline drawing algorithm in [3], our algorithm uses a larger grid size bound in trade for a smaller bound on the total number of bends. Their bend bound is (n-2). Our algorithm is based on a transformation from Schnyder's realizers [6,7] of maximal plane graphs to transversal structures [4,5] for maximal internally 4-connected plane graphs. This transformation reveals important relations between the two combinatorial structures for plane graphs, which is of independent interest.