148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
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// 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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// SPDX-License-Identifier: LGPL-3.0+
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//
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//
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// Author(s) : Andreas Fabri
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#ifndef CGAL_CARTESIAN_TRIANGLE_3_H
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#define CGAL_CARTESIAN_TRIANGLE_3_H
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#include <CGAL/Handle_for.h>
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#include <CGAL/array.h>
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namespace CGAL {
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template <class R_>
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class TriangleC3
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{
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typedef typename R_::FT FT;
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typedef typename R_::Point_3 Point_3;
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typedef typename R_::Vector_3 Vector_3;
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typedef typename R_::Plane_3 Plane_3;
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typedef typename R_::Triangle_3 Triangle_3;
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typedef cpp11::array<Point_3, 3> 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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TriangleC3() {}
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TriangleC3(const Point_3 &p, const Point_3 &q, const Point_3 &r)
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: base(CGAL::make_array(p, q, r)) {}
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bool operator==(const TriangleC3 &t) const;
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bool operator!=(const TriangleC3 &t) const;
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Plane_3 supporting_plane() const;
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bool has_on(const Point_3 &p) const;
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bool is_degenerate() const;
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const Point_3 & vertex(int i) const;
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const Point_3 & operator[](int i) const;
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FT squared_area() const;
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};
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template < class R >
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bool
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TriangleC3<R>::operator==(const TriangleC3<R> &t) const
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{
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if (CGAL::identical(base, t.base))
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return true;
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int i;
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for(i=0; i<3; i++)
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if ( vertex(0) == t.vertex(i) )
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break;
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return (i<3) && vertex(1) == t.vertex(i+1) && vertex(2) == t.vertex(i+2);
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}
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template < class R >
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inline
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bool
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TriangleC3<R>::operator!=(const TriangleC3<R> &t) const
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{
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return !(*this == t);
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}
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template < class R >
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const typename TriangleC3<R>::Point_3 &
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TriangleC3<R>::vertex(int i) const
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{
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if (i<0) i=(i%3)+3;
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else if (i>2) i=i%3;
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return (i==0) ? get_pointee_or_identity(base)[0] :
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(i==1) ? get_pointee_or_identity(base)[1] :
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get_pointee_or_identity(base)[2];
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}
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template < class R >
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inline
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const typename TriangleC3<R>::Point_3 &
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TriangleC3<R>::operator[](int i) const
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{
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return vertex(i);
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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typename TriangleC3<R>::FT
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TriangleC3<R>::squared_area() const
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{
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return internal::squared_area(vertex(0), vertex(1), vertex(2), R());
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}
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template < class R >
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inline
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typename TriangleC3<R>::Plane_3
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TriangleC3<R>::supporting_plane() const
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{
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return Plane_3(vertex(0), vertex(1), vertex(2));
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}
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template < class R >
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inline
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bool
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TriangleC3<R>::
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has_on(const typename TriangleC3<R>::Point_3 &p) const
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{
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return R().has_on_3_object()
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(static_cast<const typename R::Triangle_3&>(*this), p);
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}
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template < class R >
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bool
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TriangleC3<R>::is_degenerate() const
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{
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return collinear(vertex(0),vertex(1),vertex(2));
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}
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} //namespace CGAL
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#endif // CGAL_CARTESIAN_TRIANGLE_3_H
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