Fat Triangles Determine Linearly Many Holes

  • Authors:
  • Jiri Matousek;Janos Pach;Micha Sharir;Shmuel Sifrony;Emo Welzl

  • Affiliations:
  • -;-;-;-;-

  • Venue:
  • SIAM Journal on Computing
  • Year:
  • 1994

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Abstract

The authors show that for every fixed $\delta0$ the following holds: If $F$ is a union of $n$ triangles, all of whose angles are at least $\delta$, then the complement of $F$ has $O(n)$ connected components and the boundary of $F$ consists of $O(n \log \log n)$ straight segments (where the constants of proportionality depend on $\delta$). This latter complexity becomes linear if all triangles are of roughly the same size or if they are all infinite wedges.