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// Copyright (c) 1999 // Utrecht University (The Netherlands), // ETH Zurich (Switzerland), // INRIA Sophia-Antipolis (France), // Max-Planck-Institute Saarbruecken (Germany), // and Tel-Aviv University (Israel). All rights reserved. // // This file is part of CGAL (www.cgal.org) // // $URL: https://github.com/CGAL/cgal/blob/v6.1/Kernel_23/include/CGAL/Ray_2.h $ // $Id: include/CGAL/Ray_2.h b26b07a1242 $ // SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Andreas Fabri #ifndef CGAL_RAY_2_H #define CGAL_RAY_2_H #include #include #include #include #include #include #include namespace CGAL { template class Ray_2 : public R_::Kernel_base::Ray_2 { typedef typename R_::Boolean Boolean; typedef typename R_::RT RT; typedef typename R_::FT FT; typedef typename R_::Point_2 Point_2; typedef typename R_::Direction_2 Direction_2; typedef typename R_::Vector_2 Vector_2; typedef typename R_::Line_2 Line_2; typedef typename R_::Aff_transformation_2 Aff_transformation_2; typedef typename R_::Kernel_base::Ray_2 RRay_2; typedef Ray_2 Self; static_assert(std::is_same::value); public: typedef Dimension_tag<2> Ambient_dimension; typedef Dimension_tag<1> Feature_dimension; typedef RRay_2 Rep; const Rep& rep() const { return *this; } Rep& rep() { return *this; } typedef R_ R; Ray_2() {} Ray_2(const RRay_2& r) : RRay_2(r) {} Ray_2(RRay_2&& r) : RRay_2(std::move(r)) {} Ray_2(const Point_2 &sp, const Point_2 &secondp) : RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, secondp)) {} Ray_2(const Point_2 &sp, const Direction_2 &d) : RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, d)) {} Ray_2(const Point_2 &sp, const Vector_2 &v) : RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, v)) {} Ray_2(const Point_2 &sp, const Line_2 &l) : RRay_2(typename R::Construct_ray_2()(Return_base_tag(), sp, l)) {} decltype(auto) source() const { return R().construct_source_2_object()(*this); } decltype(auto) second_point() const { return R().construct_second_point_2_object()(*this); } Point_2 point(const FT i) const { CGAL_kernel_precondition(i >= FT(0)); typename R::Construct_vector_2 construct_vector; typename R::Construct_scaled_vector_2 construct_scaled_vector; typename R::Construct_translated_point_2 construct_translated_point; if (i == FT(0)) return source(); if (i == FT(1)) return second_point(); return construct_translated_point(source(), construct_scaled_vector(construct_vector(source(), second_point()), i)); } decltype(auto) start() const { return source(); } Boolean is_horizontal() const { return R().equal_y_2_object()(source(), second_point()); } Boolean is_vertical() const { return R().equal_x_2_object()(source(), second_point()); } Boolean is_degenerate() const { return R().is_degenerate_2_object()(*this); } Direction_2 direction() const { typename R::Construct_vector_2 construct_vector; typename R::Construct_direction_2 construct_direction; return construct_direction( construct_vector(source(), second_point()) ); } Vector_2 to_vector() const { typename R::Construct_vector_2 construct_vector; return construct_vector(source(), second_point()); } Boolean has_on(const Point_2 &p) const { typename R::Construct_vector_2 construct_vector; return p == source() || ( R().collinear_2_object()(source(), p, second_point()) && Direction_2(construct_vector( source(), p)) == direction() ); } Boolean collinear_has_on(const Point_2 &p) const { return R().collinear_has_on_2_object()(*this, p); } Ray_2 opposite() const { return Ray_2( source(), - direction() ); } Line_2 supporting_line() const { return R().construct_line_2_object()(source(), second_point()); } Ray_2 transform(const Aff_transformation_2 &t) const { return Ray_2(t.transform(source()), t.transform(second_point())); } }; template std::ostream& insert(std::ostream& os, const Ray_2& r, const Cartesian_tag&) { switch(IO::get_mode(os)) { case IO::ASCII : return os << r.source() << ' ' << r.second_point(); case IO::BINARY : return os << r.source() << r.second_point(); default: return os << "RayC2(" << r.source() << ", " << r.second_point() << ")"; } } template std::ostream& insert(std::ostream& os, const Ray_2& r, const Homogeneous_tag&) { switch(IO::get_mode(os)) { case IO::ASCII : return os << r.source() << ' ' << r.second_point(); case IO::BINARY : return os << r.source() << r.second_point(); default: return os << "RayH2(" << r.source() << ", " << r.second_point() << ")"; } } template < class R > std::ostream& operator<<(std::ostream& os, const Ray_2& r) { return insert(os, r, typename R::Kernel_tag() ); } template std::istream& extract(std::istream& is, Ray_2& r, const Cartesian_tag&) { typename R::Point_2 p, q; is >> p >> q; if (is) r = Ray_2(p, q); return is; } template std::istream& extract(std::istream& is, Ray_2& r, const Homogeneous_tag&) { typename R::Point_2 p, q; is >> p >> q; if (is) r = Ray_2(p, q); return is; } template < class R > std::istream& operator>>(std::istream& is, Ray_2& r) { return extract(is, r, typename R::Kernel_tag() ); } } //namespace CGAL #endif // CGAL_RAY_2_H