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// Copyright (c) 2006,2007,2009,2010,2011 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/Arrangement_on_surface_2/include/CGAL/Arr_simple_point_location.h $ // $Id: include/CGAL/Arr_simple_point_location.h b26b07a1242 $ // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Ron Wein // (based on old version by Eyal Flato) // Efi Fogel #ifndef CGAL_ARR_SIMPLE_POINT_LOCATION_H #define CGAL_ARR_SIMPLE_POINT_LOCATION_H #include #include /*! \file * Definition of the Arr_simple_point_location template. */ #include #include #include namespace CGAL { /*! \class * A class that answers point-location and vertical ray-shooting queries * on a 2D arrangement using a simple algorithm. * The Arrangement parameter corresponds to an arrangement instantiation * of type Arrangement_on_surface_2. */ template class Arr_simple_point_location { public: typedef Arrangement_ Arrangement_2; typedef typename Arrangement_2::Geometry_traits_2 Geometry_traits_2; typedef typename Arrangement_2::Topology_traits Topology_traits; typedef typename Arrangement_2::Vertex_const_handle Vertex_const_handle; typedef typename Arrangement_2::Halfedge_const_handle Halfedge_const_handle; typedef typename Arrangement_2::Face_const_handle Face_const_handle; typedef typename Geometry_traits_2::Point_2 Point_2; typedef typename Geometry_traits_2::X_monotone_curve_2 X_monotone_curve_2; typedef Arr_point_location_result Result; typedef typename Result::Type Result_type; // Support cpp11::result_of typedef Result_type result_type; protected: typedef typename std::optional Optional_result_type; typedef typename Topology_traits::Dcel Dcel; typedef Arr_traits_basic_adaptor_2 Traits_adaptor_2; // Data members: const Arrangement_2* m_arr; // The associated arrangement. const Traits_adaptor_2* m_geom_traits; // Its associated geometry traits. const Topology_traits* m_topol_traits; // Its associated topology traits. inline bool optional_empty(const std::optional& t) const { return (!t); } inline const Result_type& optional_assign(const std::optional& t) const { return *t; } template Result_type make_result(T t) const { return Result::make_result(t); } inline Optional_result_type make_optional_result() const { return Result::empty_optional_result(); } inline Result_type default_result() const { return Result::default_result(); } public: /*! Default constructor. */ Arr_simple_point_location() : m_arr(nullptr), m_geom_traits(nullptr), m_topol_traits(nullptr) {} /*! Constructor given an arrangement. */ Arr_simple_point_location(const Arrangement_2& arr) : m_arr(&arr) { m_geom_traits = static_cast(m_arr->geometry_traits()); m_topol_traits = m_arr->topology_traits(); } /*! Attach an arrangement object. */ void attach(const Arrangement_2& arr) { m_arr = &arr; m_geom_traits = static_cast(m_arr->geometry_traits()); m_topol_traits = m_arr->topology_traits(); } /*! Detach from the current arrangement object. */ void detach() { m_arr = nullptr; m_geom_traits = nullptr; m_topol_traits = nullptr; } /*! * Locate the arrangement feature containing the given point. * \param p The query point. * \return An object representing the arrangement feature containing the * query point. This object is either a Face_const_handle or a * Halfedge_const_handle or a Vertex_const_handle. */ Result_type locate(const Point_2& p) const; /*! * Locate the arrangement feature which a upward vertical ray emanating from * the given point hits. * \param p The query point. * \return An object representing the arrangement feature the ray hits. * This object is either an empty object or a * Halfedge_const_handle or a Vertex_const_handle. */ Result_type ray_shoot_up(const Point_2& p) const { return (_vertical_ray_shoot(p, true)); } /*! * Locate the arrangement feature which a downward vertical ray emanating * from the given point hits. * \param p The query point. * \return An object representing the arrangement feature the ray hits. * This object is either an empty object or a * Halfedge_const_handle or a Vertex_const_handle. */ Result_type ray_shoot_down(const Point_2& p) const { return (_vertical_ray_shoot(p, false)); } protected: /*! * Locate the arrangement feature which a vertical ray emanating from the * given point hits (not including isolated vertices). * \param p The query point. * \param shoot_up Indicates whether the ray is directed upward or downward. * \return An object representing the arrangement feature the ray hits. * This object is either a Halfedge_const_handle, * a Vertex_const_handle or an empty object. */ Optional_result_type _base_vertical_ray_shoot(const Point_2& p, bool shoot_up) const; /*! * Locate the arrangement feature which a vertical ray emanating from the * given point hits, considering isolated vertices. * \param p The query point. * \param shoot_up Indicates whether the ray is directed upward or downward. * \return An object representing the arrangement feature the ray hits. * This object is either a Halfedge_const_handle, * a Vertex_const_handle or an empty object. */ Result_type _vertical_ray_shoot(const Point_2& p, bool shoot_up) const; /*! * Find the first halfedge with a given source vertex, when going clockwise * from "6 o'clock" around this vertex. * \param v The given vertex. * \return The first halfedge. */ Halfedge_const_handle _first_around_vertex(Vertex_const_handle v) const; }; } //namespace CGAL // The member-function definitions can be found under: #include #include #endif