HAL - INRIA :: [inria-00192927, version 1] Maintaining Visibility Information of Planar Point Sets with a Moving Viewpoint

inria-00192927, version 1

Maintaining Visibility Information of Planar Point Sets with a Moving Viewpoint

Olivier Devillers () ¹, Vida Dujmovic ², Hazel Everett () ³, Samuel Hornus ⁴, Sue Whitesides ⁵, Steve Wismath ⁶

International Journal of Computational Geometry & Applications 17, 4 (2007) 297-304

Résumé : Given a set of n points in the plane, we consider the problem of computing the circular ordering of the points about a viewpoint q and efficiently maintaining this ordering information as q moves. In linear space, and after O(n log n) preprocessing time, our solution maintains the view at a cost of O(log n) amortized time (resp. O(log^2 n) worst case time) for each change. Our algorithm can also be used to maintain the set of points sorted according to their distance to q.

1 : GEOMETRICA (INRIA Sophia Antipolis)
INRIA
2 : Department of Mathematics and Statistics [Mac Gill]
Mac Gill University
3 : VEGAS (INRIA Lorraine - LORIA)
INRIA – CNRS : UMR7503 – Université Henri Poincaré - Nancy I – Université Nancy II – Institut National Polytechnique de Lorraine (INPL)
4 : ARTIS (INRIA Grenoble Rhône-Alpes / LJK Laboratoire Jean Kuntzmann)
CNRS : FR71 – INRIA – Laboratoire Jean Kuntzmann – CNRS : UMR5224 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
5 : School of Computer Science [Quebec] (SOCS)
McGill University
6 : Department of Mathematics and Computer Science
University of Lethbridge

inria-00192927, version 1
http://hal.inria.fr/inria-00192927
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Contributeur : Olivier Devillers <>
Soumis le : Jeudi 29 Novembre 2007, 17:20:27
Dernière modification le : Mardi 4 Décembre 2007, 20:32:38

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DOI : 10.1142/S0218195907002343

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