mirror of https://github.com/CGAL/cgal
107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
// Copyright (c) 1997-2004 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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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; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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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) : Andreas Fabri, Herve Bronnimann
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#ifndef CGAL_CARTESIAN_CIRCLE_2_H
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#define CGAL_CARTESIAN_CIRCLE_2_H
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#include <CGAL/utility.h>
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#include <CGAL/Interval_arithmetic.h>
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#include <CGAL/Cartesian/predicates_on_points_2.h>
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CGAL_BEGIN_NAMESPACE
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template <class R_ >
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class CircleC2
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{
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typedef typename R_::FT FT;
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typedef typename R_::RT RT;
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typedef typename R_::Circle_2 Circle_2;
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typedef typename R_::Point_2 Point_2;
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typedef typename R_::Aff_transformation_2 Aff_transformation_2;
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typedef Triple<Point_2, FT, Orientation> Rep;
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typedef typename R_::template Handle<Rep>::type Base;
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Base base;
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public:
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typedef R_ R;
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CircleC2() {}
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CircleC2(const Point_2 ¢er, const FT &squared_radius = FT(0),
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const Orientation &orient = COUNTERCLOCKWISE) // Is this new?
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{
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CGAL_kernel_precondition( ( squared_radius >= FT(0) ) &&
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( orient != COLLINEAR) );
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base = Rep(center, squared_radius, orient);
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}
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bool operator==(const CircleC2 &s) const;
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bool operator!=(const CircleC2 &s) const;
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const Point_2 & center() const
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{
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return get(base).first;
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}
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const FT & squared_radius() const
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{
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return get(base).second;
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}
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Orientation orientation() const
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{
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return get(base).third;
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}
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Circle_2 orthogonal_transform(const Aff_transformation_2 &t) const;
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};
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template < class R >
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CGAL_KERNEL_INLINE
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typename CircleC2<R>::Circle_2
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CircleC2<R>::orthogonal_transform
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(const typename CircleC2<R>::Aff_transformation_2 &t) const
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{
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typename R::Vector_2 vec(RT(1), RT(0) ); // unit vector // AF: was FT
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vec = vec.transform(t); // transformed
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FT sq_scale = vec.squared_length(); // squared scaling factor
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return CircleC2<R>(t.transform(center()),
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sq_scale * squared_radius(),
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t.is_even() ? orientation()
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: CGAL::opposite(orientation()));
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}
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CGAL_END_NAMESPACE
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#endif // CGAL_CARTESIAN_CIRCLE_2_H
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