mirror of https://github.com/CGAL/cgal
250 lines
6.2 KiB
C++
250 lines
6.2 KiB
C++
// Copyright (c) 2000 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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// $Source$
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// $Revision$ $Date$
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// $Name$
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//
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// Author(s) : Andreas Fabri, Herve Bronnimann
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#ifndef CGAL_CARTESIAN_RAY_2_H
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#define CGAL_CARTESIAN_RAY_2_H
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#include <CGAL/Twotuple.h>
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CGAL_BEGIN_NAMESPACE
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template < class R_ >
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class RayC2
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{
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typedef typename R_::FT FT;
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typedef typename R_::Point_2 Point_2;
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typedef typename R_::Direction_2 Direction_2;
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typedef typename R_::Vector_2 Vector_2;
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typedef typename R_::Line_2 Line_2;
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typedef typename R_::Ray_2 Ray_2;
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typedef typename R_::Aff_transformation_2 Aff_transformation_2;
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typedef Twotuple<Point_2> 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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typename R::Construct_translated_point_2 Construct_translated_point;
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RayC2() {}
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RayC2(const Point_2 &sp, const Point_2 &secondp)
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: base(sp, secondp) {}
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RayC2(const Point_2 &sp, const Direction_2 &d)
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: base(sp, Construct_translated_point( sp, d.to_vector())){}
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RayC2(const Point_2 &sp, const Vector_2 &v)
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: base(sp, Construct_translated_point(sp, v)){}
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RayC2(const Point_2 &sp, const Line_2 &l)
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: base(sp, Construct_translated_point(sp, l.to_vector())){}
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bool operator==(const RayC2 &r) const;
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bool operator!=(const RayC2 &r) const;
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const Point_2 & start() const;
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const Point_2 & source() const
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{
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return get(base).e0;
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}
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Point_2 point(int i) const;
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const Point_2 & second_point() const
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{
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return get(base).e1;
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}
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Direction_2 direction() const;
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Vector_2 to_vector() const;
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Line_2 supporting_line() const;
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Ray_2 opposite() const;
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Ray_2 transform(const Aff_transformation_2 &t) const
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{
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return RayC2<R>(t.transform(source()), t.transform(second_point()));
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}
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bool is_horizontal() const;
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bool is_vertical() const;
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bool is_degenerate() const;
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bool has_on(const Point_2 &p) const;
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bool collinear_has_on(const Point_2 &p) const;
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};
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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RayC2<R>::operator==(const RayC2<R> &r) const
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{
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if (CGAL::identical(base, r.base))
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return true;
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return source() == r.source() && direction() == r.direction();
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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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RayC2<R>::operator!=(const RayC2<R> &r) const
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{
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return !(*this == r);
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}
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template < class R >
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inline
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const typename RayC2<R>::Point_2 &
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RayC2<R>::start() const
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{
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return source();
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename RayC2<R>::Point_2
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RayC2<R>::point(int i) const
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{
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CGAL_kernel_precondition( i >= 0 );
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typename R::Construct_vector_2 construct_vector;
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typename R::Construct_scaled_vector_2 construct_scaled_vector;
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typename R::Construct_translated_point_2 construct_translated_point;
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if (i == 0) return source();
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if (i == 1) return second_point();
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return construct_translated_point(source(),
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construct_scaled_vector(construct_vector(source(),
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second_point()),
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FT(i)));
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}
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template < class R >
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inline
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typename RayC2<R>::Vector_2
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RayC2<R>::to_vector() const
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{
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typename R::Construct_vector_2 construct_vector;
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return construct_vector(source(), second_point());
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}
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template < class R >
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inline
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typename RayC2<R>::Direction_2
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RayC2<R>::direction() const
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{
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typename R::Construct_vector_2 construct_vector;
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return Direction_2( construct_vector(source(), second_point()) );
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}
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template < class R >
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inline
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typename RayC2<R>::Line_2
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RayC2<R>::supporting_line() const
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{
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return Line_2(*this);
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}
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template < class R >
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inline
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typename RayC2<R>::Ray_2
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RayC2<R>::opposite() const
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{
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return RayC2<R>( source(), - direction() );
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool RayC2<R>::is_horizontal() const
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{
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return R().equal_y_2_object()(source(), second_point());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool RayC2<R>::is_vertical() const
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{
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return R().equal_x_2_object()(source(), second_point());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool RayC2<R>::is_degenerate() const
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{
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return source() == second_point();
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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RayC2<R>::has_on(const typename RayC2<R>::Point_2 &p) const
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{
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typename R::Construct_vector_2 construct_vector;
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return p == source()
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|| R().collinear_2_object()(source(), p, second_point())
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&& Direction_2(construct_vector( source(), p)) == direction();
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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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RayC2<R>::
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collinear_has_on(const typename RayC2<R>::Point_2 &p) const
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{
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return R().collinear_has_on_2_object()(*this, p);
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}
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#ifndef CGAL_NO_OSTREAM_INSERT_RAYC2
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template < class R >
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std::ostream &
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operator<<(std::ostream &os, const RayC2<R> &r)
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{
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switch(os.iword(IO::mode)) {
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case IO::ASCII :
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return os << r.source() << ' ' << r.direction();
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case IO::BINARY :
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return os << r.source() << r.direction();
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default:
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return os << "RayC2(" << r.source() << ", " << r.direction() << ")";
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}
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}
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#endif // CGAL_NO_OSTREAM_INSERT_RAYC2
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#ifndef CGAL_NO_ISTREAM_EXTRACT_RAYC2
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template < class R >
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std::istream &
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operator>>(std::istream &is, RayC2<R> &r)
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{
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typename R::Point_2 p;
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typename R::Direction_2 d;
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is >> p >> d;
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if (is)
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r = RayC2<R>(p, d);
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return is;
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}
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#endif // CGAL_NO_ISTREAM_EXTRACT_RAYC2
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CGAL_END_NAMESPACE
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#endif // CGAL_CARTESIAN_RAY_2_H
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