mirror of https://github.com/CGAL/cgal
200 lines
4.9 KiB
C++
200 lines
4.9 KiB
C++
// Copyright (c) 1999 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) : Stefan Schirra
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#ifndef CGAL_RAYH2_H
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#define CGAL_RAYH2_H
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#include <CGAL/array.h>
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CGAL_BEGIN_NAMESPACE
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template < class R_ >
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class RayH2
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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_::Point_2 Point_2;
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typedef typename R_::Direction_2 Direction_2;
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typedef typename R_::Line_2 Line_2;
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typedef typename R_::Vector_2 Vector_2;
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typedef boost::array<Point_2, 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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RayH2() {}
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RayH2( const Point_2& sp, const Point_2& secondp)
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: base(CGALi::make_array(sp, secondp)) {}
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RayH2( const Point_2& sp, const Direction_2& d)
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: base(CGALi::make_array(sp, sp + d.to_vector())) {}
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RayH2( const Point_2& sp, const Vector_2& v)
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: base(CGALi::make_array(sp, sp + v)) {}
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RayH2( const Point_2& sp, const Line_2& l)
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: base(CGALi::make_array(sp, sp + l.to_vector())) {}
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bool operator==(const RayH2<R>& r) const;
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bool operator!=(const RayH2<R>& r) const;
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const Point_2 & start() const;
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const Point_2 & source() const;
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const Point_2 & second_point() const;
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Point_2 point(int i) const;
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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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RayH2<R> opposite() const;
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bool is_horizontal() const;
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bool is_vertical() 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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bool is_degenerate() const;
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};
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template < class R >
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inline
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const typename RayH2<R>::Point_2 &
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RayH2<R>::source() const
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{ return get(base)[0]; }
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template < class R >
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inline
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const typename RayH2<R>::Point_2 &
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RayH2<R>::start() const
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{ return source(); }
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template < class R >
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CGAL_KERNEL_INLINE
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typename RayH2<R>::Vector_2
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RayH2<R>::to_vector() const
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{
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CGAL_kernel_precondition( !is_degenerate() );
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return second_point() - start();
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename RayH2<R>::Direction_2
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RayH2<R>::direction() const
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{
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CGAL_kernel_precondition( !is_degenerate() );
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return Direction_2( second_point() - start() );
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}
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template < class R >
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inline
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const typename RayH2<R>::Point_2 &
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RayH2<R>::second_point() const
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{
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CGAL_kernel_precondition( !is_degenerate() );
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return get(base)[1];
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename RayH2<R>::Point_2
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RayH2<R>::point(int i) const
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{
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CGAL_kernel_precondition( !is_degenerate() );
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CGAL_kernel_precondition( i>= 0 );
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Vector_2 v = direction().to_vector();
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return start() + RT(i) * v;
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}
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template < class R >
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inline
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typename RayH2<R>::Line_2
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RayH2<R>::supporting_line() const
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{
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CGAL_kernel_precondition( !is_degenerate() );
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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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RayH2<R>
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RayH2<R>::opposite() const
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{ return RayH2<R>( start(), - direction() ); }
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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RayH2<R>::is_horizontal() const
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{
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return start().hy()*second_point().hw() == second_point().hy()*start().hw();
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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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RayH2<R>::is_vertical() const
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{
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return start().hx()*second_point().hw() == second_point().hx()*start().hw();
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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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RayH2<R>::has_on(const typename RayH2<R>::Point_2& p) const
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{
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return p == start() || Direction_2(p - start()) == direction();
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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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RayH2<R>::is_degenerate() const
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{ return start() == get(base)[1]; }
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template < class R >
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inline
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bool
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RayH2<R>::collinear_has_on(const typename RayH2<R>::Point_2& p) const
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{ return has_on(p); }
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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RayH2<R>::operator==(const RayH2<R>& r) const
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{ return ( (start() == r.start() )&&( direction() == r.direction() ) ); }
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template < class R >
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inline
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bool
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RayH2<R>::operator!=( const RayH2<R>& r) const
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{ return !(*this == r); }
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CGAL_END_NAMESPACE
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#endif // CGAL_RAYH2_H
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