Drawing colored graphs on colored points

  • Authors:
  • Melanie Badent;Emilio Di Giacomo;Giuseppe Liotta

  • Affiliations:
  • Department of Computer and Information Science, University of Konstanz;Dip. di Ingegneria Elettronica e dell'Informazione, Università degli Studi di Perugia;Dip. di Ingegneria Elettronica e dell'Informazione, Università degli Studi di Perugia

  • Venue:
  • WADS'07 Proceedings of the 10th international conference on Algorithms and Data Structures
  • Year:
  • 2007

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Abstract

Let G be a planar graph with n vertices whose vertex set is partitioned into subsets V0, . . ., Vk-1 for a positive integer 1 ≤ k ≤ n and let S be a set of n distinct points in the plane partitioned into subsets S0, . . ., Sk-1 with |Vi| = |Si| (0 ≤ i ≤ k - 1). This paper studies the problem of computing a crossing-free drawing of G such that each vertex of Vi is mapped to a distinct point of Si. Lower and upper bounds on the number of bends per edge are proved for any 3 ≤ k ≤ n. As a special case, we improve the upper and lower bounds presented in a paper by Pach and Wenger for k = n [Graphs and Combinatorics (2001), 17:717-728].