268 lines
6.1 KiB
C++
268 lines
6.1 KiB
C++
// Copyright (c) 1999
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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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Kernel_23/include/CGAL/Ray_2.h $
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// $Id: Ray_2.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Andreas Fabri
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#ifndef CGAL_RAY_2_H
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#define CGAL_RAY_2_H
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#include <CGAL/assertions.h>
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#include <boost/type_traits/is_same.hpp>
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#include <CGAL/Kernel/Return_base_tag.h>
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#include <CGAL/kernel_assertions.h>
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#include <CGAL/representation_tags.h>
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#include <CGAL/Dimension.h>
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#include <CGAL/result_of.h>
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#include <CGAL/IO/io.h>
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namespace CGAL {
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template <class R_>
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class Ray_2 : public R_::Kernel_base::Ray_2
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{
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typedef typename R_::RT RT;
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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_::Aff_transformation_2 Aff_transformation_2;
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typedef typename R_::Kernel_base::Ray_2 RRay_2;
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typedef Ray_2 Self;
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CGAL_static_assertion((boost::is_same<Self, typename R_::Ray_2>::value));
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public:
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typedef Dimension_tag<2> Ambient_dimension;
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typedef Dimension_tag<1> Feature_dimension;
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typedef RRay_2 Rep;
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const Rep& rep() const
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{
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return *this;
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}
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Rep& rep()
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{
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return *this;
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}
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typedef R_ R;
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Ray_2() {}
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Ray_2(const RRay_2& r)
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: RRay_2(r) {}
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Ray_2(const Point_2 &sp, const Point_2 &secondp)
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: RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, secondp)) {}
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Ray_2(const Point_2 &sp, const Direction_2 &d)
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: RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, d)) {}
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Ray_2(const Point_2 &sp, const Vector_2 &v)
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: RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, v)) {}
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Ray_2(const Point_2 &sp, const Line_2 &l)
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: RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, l)) {}
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typename cpp11::result_of<typename R_::Construct_source_2( Ray_2)>::type
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source() const
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{
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return R().construct_source_2_object()(*this);
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}
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typename cpp11::result_of<typename R_::Construct_second_point_2( Ray_2)>::type
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second_point() const
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{
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return R().construct_second_point_2_object()(*this);
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}
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Point_2 point(const FT i) const
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{
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CGAL_kernel_precondition(i >= FT(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 == FT(0)) return source();
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if (i == FT(1)) return second_point();
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return construct_translated_point(source(),
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construct_scaled_vector(construct_vector(source(), second_point()), i));
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}
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typename cpp11::result_of<typename R_::Construct_source_2( Ray_2 )>::type
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start() const
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{
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return source();
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}
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bool 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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bool 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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bool is_degenerate() const
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{
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return R().is_degenerate_2_object()(*this);
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}
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Direction_2
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direction() const
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{
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typename R::Construct_vector_2 construct_vector;
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typename R::Construct_direction_2 construct_direction;
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return construct_direction( construct_vector(source(), second_point()) );
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}
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Vector_2
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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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bool
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has_on(const 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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bool
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collinear_has_on(const 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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Ray_2
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opposite() const
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{
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return Ray_2( source(), - direction() );
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}
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Line_2
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supporting_line() const
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{
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return R().construct_line_2_object()(source(), second_point());
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}
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bool
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operator==(const Ray_2& r) const
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{
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return R().equal_2_object()(*this, r);
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}
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bool
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operator!=(const Ray_2& r) const
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{
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return !(*this == r);
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}
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Ray_2
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transform(const Aff_transformation_2 &t) const
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{
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return Ray_2(t.transform(source()), t.transform(second_point()));
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}
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};
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template <class R >
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std::ostream&
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insert(std::ostream& os, const Ray_2<R>& r, const Cartesian_tag&)
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{
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switch(get_mode(os)) {
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case IO::ASCII :
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return os << r.source() << ' ' << r.second_point();
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case IO::BINARY :
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return os << r.source() << r.second_point();
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default:
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return os << "RayC2(" << r.source() << ", " << r.second_point() << ")";
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}
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}
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template <class R >
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std::ostream&
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insert(std::ostream& os, const Ray_2<R>& r, const Homogeneous_tag&)
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{
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switch(get_mode(os))
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{
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case IO::ASCII :
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return os << r.source() << ' ' << r.second_point();
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case IO::BINARY :
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return os << r.source() << r.second_point();
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default:
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return os << "RayH2(" << r.source() << ", " << r.second_point() << ")";
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}
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}
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template < class R >
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std::ostream&
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operator<<(std::ostream& os, const Ray_2<R>& r)
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{
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return insert(os, r, typename R::Kernel_tag() );
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}
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template <class R >
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std::istream&
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extract(std::istream& is, Ray_2<R>& r, const Cartesian_tag&)
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{
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typename R::Point_2 p, q;
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is >> p >> q;
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if (is)
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r = Ray_2<R>(p, q);
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return is;
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}
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template <class R >
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std::istream&
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extract(std::istream& is, Ray_2<R>& r, const Homogeneous_tag&)
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{
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typename R::Point_2 p, q;
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is >> p >> q;
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if (is)
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r = Ray_2<R>(p, q);
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return is;
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}
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template < class R >
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std::istream&
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operator>>(std::istream& is, Ray_2<R>& r)
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{
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return extract(is, r, typename R::Kernel_tag() );
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}
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} //namespace CGAL
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#endif // CGAL_RAY_2_H
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