Flip Algorithm for Segment Triangulations

  • Authors:
  • Mathieu Brévilliers;Nicolas Chevallier;Dominique Schmitt

  • Affiliations:
  • Laboratoire LMIA, Université de Haute-Alsace, Mulhouse Cedex, France 68093;Laboratoire LMIA, Université de Haute-Alsace, Mulhouse Cedex, France 68093;Laboratoire LMIA, Université de Haute-Alsace, Mulhouse Cedex, France 68093

  • Venue:
  • MFCS '08 Proceedings of the 33rd international symposium on Mathematical Foundations of Computer Science
  • Year:
  • 2008

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Abstract

Given a set Sof disjoint line segments in the plane, which we call sites, a segment triangulation of Sis a partition of the convex hull of Sinto sites, edges, and faces. The set of faces is a maximal set of disjoint triangles such that the vertices of each triangle are on three distinct sites. The segment Delaunay triangulation of Sis the segment triangulation of Swhose faces are inscribable in circles whose interiors do not intersect S. It is dual to the segment Voronoi diagram. The aim of this paper is to show that any given segment triangulation can be transformed by a finite sequence of local improvements in a segment triangulation that has the same topology as the segment Delaunay triangulation. The main difference with the classical flip algorithm for point set triangulations is that local improvements have to be computed on non convex regions. We overcome this difficulty by using locally convex functions.