, Volume 63, Issue 3, pp 672–691 | Cite as

Optimal Polygonal Representation of Planar Graphs

  • C. A. Duncan
  • E. R. Gansner
  • Y. F. Hu
  • M. Kaufmann
  • S. G. Kobourov


In this paper, we consider the problem of representing planar graphs by polygons whose sides touch. We show that at least six sides per polygon are necessary by constructing a class of planar graphs that cannot be represented by pentagons. We also show that the lower bound of six sides is matched by an upper bound of six sides with a linear-time algorithm for representing any planar graph by touching hexagons. Moreover, our algorithm produces convex polygons with edges having at most three slopes and with all vertices lying on an O(nO(n) grid.


Planar graphs Contact graphs Graph drawing Polygonal drawings 


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • C. A. Duncan
    • 1
  • E. R. Gansner
    • 2
  • Y. F. Hu
    • 2
  • M. Kaufmann
    • 3
  • S. G. Kobourov
    • 4
  1. 1.Dept. of Computer ScienceLouisiana Tech UniversityRustonUSA
  2. 2.AT&T Labs – ResearchFlorham ParkUSA
  3. 3.Wilhelm-Schickhard-Institut for Computer ScienceTübingen UniversityTübingenGermany
  4. 4.Dept. of Computer ScienceUniversity of ArizonaTucsonUSA

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