Drawing unordered trees on k-grids

  • Authors:
  • Christian Bachmaier;Marco Matzeder

  • Affiliations:
  • University of Passau, Germany;University of Passau, Germany

  • Venue:
  • WALCOM'12 Proceedings of the 6th international conference on Algorithms and computation
  • Year:
  • 2012

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Abstract

We present almost linear area bounds for drawing complete trees on the octagonal grid. For 7-ary trees we establish an upper and lower bound of Θ(n1.129) and for ternary trees the bounds of $\O(n^{1.048})$ and Θ(n), where the latter needs edge bends. We explore the unit edge length and area complexity of drawing unordered trees on k-grids with k∈{4, 6, 8} and generalize the $\mathcal{NP}$-hardness results of the orthogonal and hexagonal grid to the octagonal grid.