mirror of https://github.com/CGAL/cgal
66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
// Copyright (c) 2000
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 3 of the License,
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// or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Geert-Jan Giezeman
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#ifndef CGAL_CIRCLE_2_CIRCLE_2_INTERSECTION_H
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#define CGAL_CIRCLE_2_CIRCLE_2_INTERSECTION_H
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#include <CGAL/Circle_2.h>
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#include <CGAL/squared_distance_2_1.h>
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namespace CGAL {
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namespace internal {
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template <class K>
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bool
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do_intersect(const typename K::Circle_2 & circ1,
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const typename K::Circle_2& circ2,
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const K&)
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{
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typedef typename K::FT FT;
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FT sr1 = circ1.squared_radius();
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FT sr2 = circ2.squared_radius();
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FT squared_dist = squared_distance(circ1.center(), circ2.center());
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FT temp = sr1+sr2-squared_dist;
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return !(FT(4)*sr1*sr2 < temp*temp);
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}
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} // namespace internal
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template <class K>
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inline
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bool
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do_intersect(const Circle_2<K> & circ1,
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const Circle_2<K> & circ2)
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{
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typedef typename K::Do_intersect_2 Do_intersect;
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return Do_intersect()(circ1, circ2);
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}
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} //namespace CGAL
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#endif
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