On finding widest empty curved corridors

  • Authors:
  • Sergey Bereg;J. Miguel Díaz-Báòez;Carlos Seara;Inmaculada Ventura

  • Affiliations:
  • Department of Computer Science, University of Texas at Dallas, Box 830688, Richardson, TX 75083, USA;Departamento de Matemática Aplicada II, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;Departament de Matemàtica Aplicada II, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain;Departamento de Matemáticas, Universidad de Huelva, Spain

  • Venue:
  • Computational Geometry: Theory and Applications
  • Year:
  • 2007

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Abstract

An α-siphon of width w is the locus of points in the plane that are at the same distance w from a 1-corner polygonal chain C such that α is the interior angle of C. Given a set P of n points in the plane and a fixed angle α, we want to compute the widest empty α-siphon that splits P into two non-empty sets. We present an efficient O(nlog3n)-time algorithm for computing the widest oriented α-siphon through P such that the orientation of a half-line of C is known. We also propose an O(n3log2n)-time algorithm for the widest arbitrarily-oriented version and an Θ(nlogn)-time algorithm for the widest arbitrarily-oriented α-siphon anchored at a given point.