Succinct greedy drawings do not always exist

  • Authors:
  • Patrizio Angelini;Giuseppe Di Battista;Fabrizio Frati

  • Affiliations:
  • Dipartimento di Informatica e Automazione, Roma Tre University, Italy;Dipartimento di Informatica e Automazione, Roma Tre University, Italy;Dipartimento di Informatica e Automazione, Roma Tre University, Italy

  • Venue:
  • GD'09 Proceedings of the 17th international conference on Graph Drawing
  • Year:
  • 2009

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Abstract

A greedy drawing is a graph drawing containing a distance-decreasing path for every pair of nodes. A path (v0,v1,...,vm) is distance-decreasing if d(vi,vm)d(vi−1,vm), for i=1,...,m. Greedy drawings easily support geographic greedy routing. Hence, a natural and practical problem is the one of constructing greedy drawings in the plane using few bits for representing vertex Cartesian coordinates and using the Euclidean distance as a metric. We show that there exist greedy-drawable graphs that do not admit any greedy drawing in which the Cartesian coordinates have less than a polynomial number of bits.