Discrete & Computational Geometry

, Volume 7, Issue 1, pp 13–28 | Cite as

Classes of graphs which approximate the complete euclidean graph

  • J. Mark Keil
  • Carl A. Gutwin


LetS be a set ofN points in the Euclidean plane, and letd(p, q) be the Euclidean distance between pointsp andq inS. LetG(S) be a Euclidean graph based onS and letG(p, q) be the length of the shortest path inG(S) betweenp andq. We say a Euclidean graphG(S)t-approximates the complete Euclidean graph if, for everyp, q εS, G(p, q)/d(p, q) ≤t. In this paper we present two classes of graphs which closely approximate the complete Euclidean graph. We first consider the graph of the Delaunay triangulation ofS, DT(S). We show that DT(S) (2π/(3 cos(π/6)) ≈ 2.42)-approximates the complete Euclidean graph. Secondly, we defineθ(S), the fixed-angleθ-graph (a type of geometric neighbor graph) and show thatθ(S) ((1/cosθ)(1/(1−tanθ)))-approximates the complete Euclidean graph.


Short Path Voronoi Diagram Discrete Comput Geom Delaunay Triangulation Inductive Assumption 
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Copyright information

© Springer-Verlag New York Inc. 1992

Authors and Affiliations

  • J. Mark Keil
    • 1
  • Carl A. Gutwin
    • 1
  1. 1.Department of Computational ScienceUniversity of SaskatchewanSaskatoonCanada

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