# Algebraic Methods and Arithmetic Filtering for Exact Predicates on Circle Arcs

1 PRISME - Geometry, Algorithms and Robotics
CRISAM - Inria Sophia Antipolis - Méditerranée
2 SAGA - Algebraic Systems, Geometry and Applications
CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : The purpose of this paper is to present a new method to design exact geometric predicates in algorithms dealing with curved objects such as circular arcs. We focus on the comparison of the abscissae of two intersection points of circle arcs, which is known to be a difficult predicate involved in the computation of arrangements of circle arcs. We present an algorithm for deciding the $x$-order of intersections from the signs of the coefficients of a polynomial, obtained by a general approach based on resultants. This method allows the use of efficient arithmetic and filtering techniques leading to fast implementation as shown by the experimental results.
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https://hal.inria.fr/inria-00072832
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Submitted on : Wednesday, May 24, 2006 - 11:03:54 AM
Last modification on : Wednesday, October 30, 2019 - 7:36:17 PM
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### Identifiers

• HAL Id : inria-00072832, version 1

### Citation

Olivier Devillers, Alexandra Fronville, Bernard Mourrain, Monique Teillaud. Algebraic Methods and Arithmetic Filtering for Exact Predicates on Circle Arcs. RR-3826, INRIA. 1999. ⟨inria-00072832⟩

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