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// Copyright (c) 2005,2006,2007,2009,2010,2011 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_triangulation_point_location.h $ // $Id: include/CGAL/Arr_triangulation_point_location.h b26b07a1242 $ // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // Author(s) : Idit Haran #ifndef CGAL_ARR_TRIANGULATION_POINT_LOCATION_H #define CGAL_ARR_TRIANGULATION_POINT_LOCATION_H #include #include /*! \file * Definition of the Arr_triangulation_point_location template. */ #include #include #include #include #include #include #include #include namespace CGAL { /*! \class * A class that answers point-location queries on an arrangement using the * triangulation algorithm. */ template class Arr_triangulation_point_location : public Arrangement_::Observer { public: using Arrangement_2 = Arrangement_; using Base_aos = typename Arrangement_2::Base_aos; using Geometry_traits_2 = typename Base_aos::Geometry_traits_2; using Kernel = typename Geometry_traits_2::Kernel; using Vertex_const_handle = typename Base_aos::Vertex_const_handle; using Halfedge_const_handle = typename Base_aos::Halfedge_const_handle; using Face_const_handle = typename Base_aos::Face_const_handle; using Vertex_handle = typename Base_aos::Vertex_handle; using Halfedge_handle = typename Base_aos::Halfedge_handle; using Face_handle = typename Base_aos::Face_handle; using Vertex_const_iterator = typename Base_aos::Vertex_const_iterator; using Edge_const_iterator = typename Base_aos::Edge_const_iterator; using Face_const_iterator = typename Base_aos::Face_const_iterator; using Halfedge_const_iterator = typename Base_aos::Halfedge_const_iterator; using Halfedge_around_vertex_const_circulator = typename Base_aos::Halfedge_around_vertex_const_circulator; using Ccb_halfedge_const_circulator = typename Base_aos::Ccb_halfedge_const_circulator; using Ccb_halfedge_circulator = typename Base_aos::Ccb_halfedge_circulator; using Isolated_vertex_const_iterator = typename Base_aos::Isolated_vertex_const_iterator; using Point_2 = typename Geometry_traits_2::Point_2; using X_monotone_curve_2 = typename Geometry_traits_2::X_monotone_curve_2; using Edge_list = std::list; using Std_edge_iterator = typename Edge_list::iterator; //---------------------------------------------------------- // Triangulation Types //---------------------------------------------------------- using Vbb = Triangulation_vertex_base_with_info_2; using Vb = Triangulation_hierarchy_vertex_base_2; //typedef Triangulation_face_base_with_info_2 Fbt; using Fb = Constrained_triangulation_face_base_2; using TDS = Triangulation_data_structure_2; using Itag = Exact_predicates_tag; //typedef Constrained_Delaunay_triangulation_2 CDT; using CDT_t = Constrained_Delaunay_triangulation_2; using CDTH = Triangulation_hierarchy_2; using CDT = Constrained_triangulation_plus_2; using CDT_Point = typename CDT::Point; using CDT_Edge = typename CDT::Edge; using CDT_Face_handle = typename CDT::Face_handle; using CDT_Vertex_handle = typename CDT::Vertex_handle; using CDT_Finite_faces_iterator = typename CDT::Finite_faces_iterator; using CDT_Finite_vertices_iterator = typename CDT::Finite_vertices_iterator; using CDT_Finite_edges_iterator = typename CDT::Finite_edges_iterator; using CDT_Locate_type = typename CDT::Locate_type; using Result = Arr_point_location_result; using Result_type = typename Result::Type; // Support cpp11::result_of using result_type = Result_type; protected: using Traits_adaptor_2 = Arr_traits_basic_adaptor_2; // Data members: const Traits_adaptor_2* m_traits; // Its associated traits object. bool m_ignore_notifications; bool m_ignore_remove_edge; CDT m_cdt; template Result_type make_result(T t) const { return Result::make_result(t); } inline Result_type default_result() const { return Result::default_result(); } public: /*! Default constructor. */ Arr_triangulation_point_location() : m_traits(nullptr), m_ignore_notifications(false), m_ignore_remove_edge(false) {} /*! Constructor from an arrangement. * \param arr (in) The arrangement. */ Arr_triangulation_point_location(const Base_aos& arr) : Base_aos::Observer(const_cast(arr)), m_traits(static_cast(arr.geometry_traits())), m_ignore_notifications(false), m_ignore_remove_edge(false) { build_triangulation(); } /*! Locate the arrangement feature containing the given point. * \param p (in) 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; //Observer functions that are relevant to overload //------------------------------------------------- /*! Attach an arrangement. * \param arr (in) The arrangement. */ virtual void before_attach(const Base_aos& arr) override { m_traits = static_cast(arr.geometry_traits()); } virtual void after_attach() override { build_triangulation(); } virtual void before_detach() override { clear_triangulation(); } /// \name Overloaded observer functions on global changes. //@{ /*! Notification after the arrangement has been assigned with another * arrangement. */ virtual void after_assign() override { clear_triangulation(); build_triangulation(); } /*! Notification after the arrangement is cleared. */ virtual void after_clear() override { clear_triangulation(); build_triangulation(); } /*! Notification before a global operation modifies the arrangement. */ virtual void before_global_change() override { clear_triangulation(); m_ignore_notifications = true; } /*! Notification after a global operation is completed. */ virtual void after_global_change() override { build_triangulation(); m_ignore_notifications = false; } //@} /// \name Overloaded observer functions on local changes. //@{ /*! Notification before the removal of an edge. * \param e (in) A handle to one of the twin halfedges to be removed. */ virtual void before_remove_edge(Halfedge_handle /* e */) override { m_ignore_remove_edge = true; } /*! Notification after the creation of a new vertex. * \param v (in) A handle to the created vertex. */ virtual void after_create_vertex(Vertex_handle /* v */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after the creation of a new edge. * \param e (in) A handle to one of the twin halfedges that were created. */ virtual void after_create_edge(Halfedge_handle /* e */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after an edge was split. * \param e1 (in) A handle to one of the twin halfedges forming the first edge. * \param e2 (in) A handle to one of the twin halfedges forming the second edge. */ virtual void after_split_edge(Halfedge_handle /* e1 */, Halfedge_handle /* e2 */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after a face was split. * \param f (in) A handle to the face we have just split. * \param new_f (in) A handle to the new face that has been created. * \param is_hole (in) Whether the new face forms a hole inside f. */ virtual void after_split_face(Face_handle /* f */, Face_handle /* new_f */, bool /* is_hole */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after an outer CCB was created inside a face. * \param h (in) A circulator representing the boundary of the new outer CCB. */ virtual void after_add_outer_ccb(Ccb_halfedge_circulator /* h */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after an edge was merged. * \param e (in) A handle to one of the twin halfedges forming the merged edge. */ virtual void after_merge_edge(Halfedge_handle /* e */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after a face was merged. * \param f (in) A handle to the merged face. */ virtual void after_merge_face(Face_handle /* f */) override { if (! m_ignore_notifications && ! m_ignore_remove_edge) { clear_triangulation(); build_triangulation(); } } /*! Notification after an outer CCB is moved from one face to another. * \param h (in) A circulator representing the boundary of the component. */ virtual void after_move_outer_ccb(Ccb_halfedge_circulator /* h */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification before the removal of a vertex. * \param v (in) A handle to the vertex to be deleted. */ virtual void after_remove_vertex() override { if (! m_ignore_notifications && ! m_ignore_remove_edge) { clear_triangulation(); build_triangulation(); } } /*! Notification before the removal of an edge. * \param e (in) A handle to one of the twin halfedges to be deleted. */ virtual void after_remove_edge() override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } m_ignore_remove_edge = false; } /*! Notification before the removal of an outer CCB. * \param f (in) The face that used to own the outer CCB. */ virtual void after_remove_outer_ccb(Face_handle /* f */) override { if (! m_ignore_notifications && ! m_ignore_remove_edge) { clear_triangulation(); build_triangulation(); } } /*! Notification after an inner CCB was created inside a face. * \param h (in) A circulator representing the boundary of the new inner CCB. */ virtual void after_add_inner_ccb(Ccb_halfedge_circulator /* h */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after an inner CCB is moved from one face to another. * \param h (in) A circulator representing the boundary of the component. */ virtual void after_move_inner_ccb(Ccb_halfedge_circulator /* h */) override { if (! m_ignore_notifications) { clear_triangulation(); build_triangulation(); } } /*! Notification after the removal of an inner CCB. * \param f (in) The face that used to contain the inner CCB. */ virtual void after_remove_inner_ccb(Face_handle /* f */) override { if (! m_ignore_notifications && ! m_ignore_remove_edge) { clear_triangulation(); build_triangulation(); } } // @} protected: /*! Locate the arrangement feature containing the given point in the * unbounded face(s). * \param p (in) The query point. * \return An object representing the arrangement feature containing the * query point. This object is either a Face_const_handle * representing an unbounded face or a Vertex_const_handle * representing an isolated vertex. */ result_type locate_in_unbounded(const Point_2& p) const; void clear_triangulation(); void build_triangulation(); }; } //namespace CGAL // The member-function definitions can be found under: #include #include #endif