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// Copyright (c) 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_face_index_map.h $ // $Id: include/CGAL/Arr_face_index_map.h b26b07a1242 $ // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Ron Wein #ifndef CGAL_ARR_FACE_INDEX_MAP_H #define CGAL_ARR_FACE_INDEX_MAP_H #include #include /*! \file * Definition of the Arr_face_index_map class. */ #include #include #include namespace CGAL { /*! \class * An auxiliary class that automatically maintains a mapping of the * arrangement faces to the indices 0, ..., (n -1), where n is the number * of faces in the arrangement. */ template class Arr_face_index_map : public Arrangement_::Observer { public: using Arrangement_2 = Arrangement_; using Base_aos = typename Arrangement_2::Base_aos; using Halfedge_handle = typename Base_aos::Halfedge_handle; using Face_handle = typename Base_aos::Face_handle; // Boost property type definitions: using category = boost::readable_property_map_tag; using value_type = unsigned int; using reference = value_type; using key_type = Face_handle; private: using Self = Arr_face_index_map; using Base = typename Arrangement_2::Observer; using Index_map = Unique_hash_map; // Data members: unsigned int n_faces; // The current number of faces. Index_map index_map; // Mapping faces to indices. std::vector rev_map; // Mapping indices to faces. enum {MIN_REV_MAP_SIZE = 32}; public: /*! constructs default. */ Arr_face_index_map() : Base(), n_faces(0), rev_map(MIN_REV_MAP_SIZE) {} /*! constructs from an associated arrangement. */ Arr_face_index_map(const Base_aos& arr) : Base(const_cast(arr)) { _init(); } /*! constructs copy. */ Arr_face_index_map(const Self& other) : Base(const_cast(*(other.arrangement()))) { _init(); } /*! assigns. */ Self& operator= (const Self& other) { if (this == &other) return (*this); this->detach(); this->attach(const_cast(*(other.arrangement()))); return (*this); } /*! obtains the index of a given face. * \param f A handle to the face. * \pre f is a valid face in the arrangement. */ unsigned int operator[](Face_handle f) const { return (index_map[f]); } /*! obtains the face given its index. * \param i The index of the face. * \pre i is less than the number of faces in the arrangement. */ Face_handle face(const int i) const { CGAL_precondition((unsigned int) i < n_faces); return (rev_map[i]); } /// \name Notification functions, to keep the mapping up-to-date. //@{ /*! updates the mapping after the arrangement has been assigned with another * arrangement. */ virtual void after_assign() override { _init(); } /*! updates the mapping after the arrangement is cleared. */ virtual void after_clear() override { _init(); } /*! updates the mapping after attaching to a new arrangement. */ virtual void after_attach() override { _init(); } /*! updates the mapping after detaching the arrangement. */ virtual void after_detach() override { n_faces = 0; index_map.clear(); } /*! updates the mapping after the creation of a new face is split from another * face. * \param f A handle to the existing face. * \param new_f A handle to the newly created face. */ virtual void after_split_face(Face_handle /* f */, Face_handle new_f, bool /* is_hole */) override { // Update the number of vertices. ++n_faces; // If necessary, allocate memory for the reverse mapping. if (rev_map.size() < n_faces) rev_map.resize(2 * n_faces); // Update the mapping of the newly created face. index_map[new_f] = n_faces - 1; rev_map[n_faces - 1] = new_f; } /*! updates the mapping before the merge of two faces. * \param f1 A handle to the face that is going to remain. * \param f2 A handle to the face that is about to be removed. */ virtual void before_merge_face(Face_handle /* f1 */, Face_handle f2, Halfedge_handle /* e */) override { // Update the number of faces. --n_faces; // Reduce memory consumption in case the number of faces has // drastically decreased. if (2*n_faces+1 < rev_map.size() && rev_map.size() / 2 >= MIN_REV_MAP_SIZE) { rev_map.resize(rev_map.size() / 2); } // Get the current face index, and assign this index to the face // currently indexed (n - 1). unsigned int index = index_map[f2]; if (index == n_faces) return; Face_handle last_f = rev_map[n_faces]; index_map[last_f] = index; rev_map[index] = last_f; // Clear the reverse mapping for the last face. rev_map[n_faces] = Face_handle(); } //@} private: /*! initializes the map for the given arrangement. */ void _init() { // Get the number of faces and allocate the reverse map accordingly. n_faces = static_cast(this->arrangement()->number_of_faces()); if (n_faces < MIN_REV_MAP_SIZE) rev_map.resize (MIN_REV_MAP_SIZE); else rev_map.resize (n_faces); // Clear the current mapping. index_map.clear(); // Create the initial mapping. Face_handle fh; unsigned int index = 0; for (auto fit = this->arrangement()->faces_begin(); fit != this->arrangement()->faces_end(); ++fit, ++index) { // Map the current face to the current index. fh = fit; index_map[fh] = index; rev_map[index] = fh; } } }; /*! obtains the index property-map function. Provided so that boost is able to * access the Arr_face_index_map above. * \param index_map The index map. * \param f A face handle. * \return The face index. */ template unsigned int get(const CGAL::Arr_face_index_map& index_map, typename Arrangement::Face_handle f) { return (index_map[f]); } } // namespace CGAL #include #endif