Embedding Planar Graphs at Fixed Vertex Locations

  • Authors:
  • János Pach;Rephael Wenger

  • Affiliations:
  • -;-

  • Venue:
  • GD '98 Proceedings of the 6th International Symposium on Graph Drawing
  • Year:
  • 1998

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Abstract

Let G be a planar graph of n vertices, v1,..., vn, and let {p1,...,pn} be a set of n points in the plane. We present an algorithm for constructing in O(n2) time a planar embedding of G, where vertex vi is represented by point pi and each edge is represented by a polygonal curve with O(n) bends (internal vertices.) This bound is asymptotically optimal in the worst case. In fact, if G is a planar graph containing at least m pairwise independent edges and the vertices of G are randomly assigned to points in convex position, then, almost surely, every planar embedding of G mapping vertices to their assigned points and edges to polygonal curves has at least m/20 edges represented by curves with at least m/403 bends.