Accelerated bend minimization

  • Authors:
  • Sabine Cornelsen;Andreas Karrenbauer

  • Affiliations:
  • Department of Computer & Information Science, University of Konstanz, Germany;Department of Computer & Information Science, University of Konstanz, Germany

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

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Abstract

We present an $\mathcal O( n^{3/2})$ algorithm for minimizing the number of bends in an orthogonal drawing of a plane graph. It has been posed as a long standing open problem at Graph Drawing 2003, whether the bound of $\mathcal O(n^{7/4}\sqrt{\log n})$ shown by Garg and Tamassia in 1996 could be improved. To answer this question, we show how to solve the uncapacitated min-cost flow problem on a planar bidirected graph with bounded costs and face sizes in $\mathcal O(n^{3/2})$ time.