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// Copyright (c) 1997 // 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/HalfedgeDS/include/CGAL/HalfedgeDS_const_decorator.h $ // $Id: include/CGAL/HalfedgeDS_const_decorator.h b26b07a1242 $ // SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Lutz Kettner #ifndef CGAL_HALFEDGEDS_CONST_DECORATOR_H #define CGAL_HALFEDGEDS_CONST_DECORATOR_H 1 #include #include #include namespace CGAL { template < class p_HDS > class HalfedgeDS_const_decorator : public HalfedgeDS_items_decorator { // TYPES (inherited from Items_decorator, but have to be repeated) // --------------------------------------------------------------- public: typedef p_HDS HDS; typedef p_HDS HalfedgeDS; typedef typename HDS::Traits Traits; typedef typename HDS::Vertex Vertex; typedef typename HDS::Halfedge Halfedge; typedef typename HDS::Face Face; typedef typename HDS::Vertex_handle Vertex_handle; typedef typename HDS::Vertex_const_handle Vertex_const_handle; typedef typename HDS::Vertex_iterator Vertex_iterator; typedef typename HDS::Vertex_const_iterator Vertex_const_iterator; typedef typename HDS::Halfedge_handle Halfedge_handle; typedef typename HDS::Halfedge_const_handle Halfedge_const_handle; typedef typename HDS::Halfedge_iterator Halfedge_iterator; typedef typename HDS::Halfedge_const_iterator Halfedge_const_iterator; typedef typename HDS::Face_handle Face_handle; typedef typename HDS::Face_const_handle Face_const_handle; typedef typename HDS::Face_iterator Face_iterator; typedef typename HDS::Face_const_iterator Face_const_iterator; typedef typename HDS::size_type size_type; typedef typename HDS::difference_type difference_type; typedef typename HDS::iterator_category iterator_category; // The following types are equal to either `Tag_true' or `Tag_false', // dependent whether the named feature is supported or not. typedef typename HDS::Supports_vertex_halfedge Supports_vertex_halfedge; typedef typename HDS::Supports_halfedge_prev Supports_halfedge_prev; typedef typename HDS::Supports_halfedge_vertex Supports_halfedge_vertex; typedef typename HDS::Supports_halfedge_face Supports_halfedge_face; typedef typename HDS::Supports_face_halfedge Supports_face_halfedge; typedef typename HDS::Supports_removal Supports_removal; using HalfedgeDS_items_decorator::insert_tip; using HalfedgeDS_items_decorator::get_prev; using HalfedgeDS_items_decorator::set_prev; using HalfedgeDS_items_decorator::get_face; using HalfedgeDS_items_decorator::set_face; using HalfedgeDS_items_decorator::get_vertex; using HalfedgeDS_items_decorator::set_vertex; using HalfedgeDS_items_decorator::get_vertex_halfedge; using HalfedgeDS_items_decorator::set_vertex_halfedge; using HalfedgeDS_items_decorator::get_face_halfedge; using HalfedgeDS_items_decorator::set_face_halfedge; using HalfedgeDS_items_decorator::set_vertex_in_vertex_loop; using HalfedgeDS_items_decorator::set_face_in_face_loop; using HalfedgeDS_items_decorator::insert_halfedge; protected: typedef typename Vertex::Base VBase; typedef typename Halfedge::Base HBase; typedef typename Halfedge::Base_base HBase_base; typedef typename Face::Base FBase; // PRIVATE MEMBER VARIABLES // ---------------------------------- private: const p_HDS* hds; // CREATION // ---------------------------------- public: // No default constructor, keeps always a reference to a HDS! HalfedgeDS_const_decorator( const p_HDS& h) : hds(&h) {} // keeps internally a const reference to `hds'. bool is_valid( bool verb = false, int level = 0) const; // returns `true' if the halfedge data structure `hds' is valid // with respect to the `level' value as defined in the reference // manual. If `verbose' is `true', statistics are written to // `cerr'. bool normalized_border_is_valid( bool verb = false) const; // returns `true' if the border halfedges are in normalized // representation, which is when enumerating all halfedges with // the halfedge iterator the following holds: The non-border edges // precede the border edges. For border edges, the second halfedge // is a border halfedge. (The first halfedge may or may not be a // border halfedge.) The halfedge iterator `border_halfedges_begin // ()' denotes the first border edge. If `verbose' is `true', // statistics are written to `cerr'. }; template < class p_HDS > bool HalfedgeDS_const_decorator:: normalized_border_is_valid( bool verb) const { bool valid = true; Verbose_ostream verr(verb); verr << "begin CGAL::HalfedgeDS_const_decorator::" "normalized_border_is_valid( verb=true):" << std::endl; Halfedge_const_iterator e = hds->halfedges_begin(); size_type count = 0; while( e != hds->halfedges_end() && ! e->is_border() && ! e->opposite()->is_border()) { ++e; ++e; ++count; } verr << " non-border edges: " << count << std::endl; if ( e != hds->border_halfedges_begin()) { verr << " first border edge does not start at " "border_halfedges_begin()" << std::endl; valid = false; } else { count = 0; while( valid && e != hds->halfedges_end() && e->opposite()->is_border()) { ++e; ++e; ++count; } verr << " border edges: " << count << std::endl; verr << " total edges: " << hds->size_of_halfedges()/2 << std::endl; if ( e != hds->halfedges_end()) { if ( e->is_border()) { verr << " border edge " << count << ": wrong orientation." << std::endl; } verr << " the sum of full + border equals not total edges." << std::endl; valid = false; } } verr << "end of CGAL::HalfedgeDS_const_decorator::normalized_" "border_is_valid(): structure is " << ( valid ? "valid." : "NOT VALID.") << std::endl; return valid; } template < class p_HDS > bool HalfedgeDS_const_decorator:: is_valid( bool verb, int level) const { Verbose_ostream verr(verb); verr << "begin CGAL::HalfedgeDS_const_decorator::is_valid(" " verb=true, level = " << level << "):" << std::endl; bool valid = ( 1 != (hds->size_of_halfedges() & 1)); if ( ! valid) verr << "number of halfedges is odd." << std::endl; // All halfedges. Halfedge_const_iterator begin = hds->halfedges_begin(); Halfedge_const_iterator end = hds->halfedges_end(); size_type n = 0; size_type nb = 0; for( ; valid && (begin != end); begin++) { verr << "halfedge " << n << std::endl; if ( begin->is_border()) verr << " is border halfedge" << std::endl; // Pointer integrity. valid = valid && ( begin->next() != Halfedge_const_handle()); valid = valid && ( begin->opposite() != Halfedge_const_handle()); if ( ! valid) { verr << " pointer integrity corrupted (ptr==0)." << std::endl; break; } // opposite integrity. valid = valid && ( begin->opposite() != begin); valid = valid && ( begin->opposite()->opposite() == begin); if ( ! valid) { verr << " opposite pointer integrity corrupted." << std::endl; break; } // previous integrity. valid = valid && ( ! check_tag( Supports_halfedge_prev()) || get_prev(begin->next()) == begin); if ( ! valid) { verr << " previous pointer integrity corrupted." << std::endl; break; } if ( level > 0) { // vertex integrity. valid = valid && ( ! check_tag( Supports_halfedge_vertex()) || get_vertex( begin) != Vertex_const_handle()); if ( ! valid) { verr << " vertex pointer integrity corrupted." << std::endl; break; } valid = valid && ( get_vertex( begin) == get_vertex( begin->next()->opposite())); if ( ! valid) { verr << " vertex pointer integrity2 corrupted." << std::endl; break; } // face integrity. valid = valid && ( ! check_tag( Supports_halfedge_face()) || begin->is_border() || get_face(begin) != Face_const_handle()); if ( ! valid) { verr << " face pointer integrity corrupted." << std::endl; break; } valid = valid && ( get_face(begin) == get_face(begin->next())); if ( ! valid) { verr << " face pointer integrity2 corrupted." << std::endl; break; } } ++n; if ( begin->is_border()) ++nb; } verr << "sum border halfedges (2*nb) = " << 2 * nb << std::endl; if ( valid && n != hds->size_of_halfedges()) verr << "counting halfedges failed." << std::endl; if ( valid && level >= 4 && (nb != hds->size_of_border_halfedges())) verr << "counting border halfedges failed." << std::endl; valid = valid && ( n == hds->size_of_halfedges()); valid = valid && ( level < 4 || (nb == hds->size_of_border_halfedges())); // All vertices. Vertex_const_iterator vbegin = hds->vertices_begin(); Vertex_const_iterator vend = hds->vertices_end(); size_type v = 0; n = 0; for( ; valid && (vbegin != vend); ++vbegin) { verr << "vertex " << v << std::endl; // Pointer integrity. if ( get_vertex_halfedge( vbegin) != Halfedge_const_handle()) valid = valid && ( ! check_tag( Supports_halfedge_vertex()) || get_vertex( get_vertex_halfedge( vbegin)) == vbegin); else valid = valid && (! check_tag( Supports_vertex_halfedge())); if ( ! valid) { verr << " halfedge pointer in vertex corrupted." << std::endl; break; } // cycle-around-vertex test. Halfedge_const_handle h = get_vertex_halfedge( vbegin); if ( level >= 2 && h != Halfedge_const_handle()) { Halfedge_const_handle g = h; do { verr << " halfedge " << n << std::endl; ++n; h = h->next()->opposite(); valid = valid && ( n <= hds->size_of_halfedges() && n!=0); if ( ! valid) verr << " too many halfedges around vertices." << std::endl; } while ( valid && (h != g)); } ++v; } if ( valid && v != hds->size_of_vertices()) verr << "counting vertices failed." << std::endl; if ( valid && level >= 2 && ( check_tag( Supports_vertex_halfedge()) && n != hds->size_of_halfedges())) verr << "counting halfedges via vertices failed." << std::endl; valid = valid && ( v == hds->size_of_vertices()); valid = valid && ( level < 2 || ! check_tag( Supports_vertex_halfedge()) || n == hds->size_of_halfedges()); // All faces. Face_const_iterator fbegin = hds->faces_begin(); Face_const_iterator fend = hds->faces_end(); size_type f = 0; n = 0; for( ; valid && (fbegin != fend); ++fbegin) { verr << "face " << f << std::endl; // Pointer integrity. if ( get_face_halfedge( fbegin) != Halfedge_const_handle()) valid = valid && ( ! check_tag( Supports_halfedge_face()) || get_face( get_face_halfedge( fbegin)) == fbegin); else valid = valid && (! check_tag( Supports_face_halfedge()) || begin->is_border()); if ( ! valid) { verr << " halfedge pointer in face corrupted." << std::endl; break; } // cycle-around-face test. Halfedge_const_handle h = get_face_halfedge( fbegin); if ( level >= 3 && h != Halfedge_const_handle()) { Halfedge_const_handle g = h; do { verr << " halfedge " << n << std::endl; ++n; h = h->next(); valid = valid && ( n <= hds->size_of_halfedges() && n!=0); if ( ! valid) verr << " too many halfedges around faces." << std::endl; } while ( valid && (h != g)); } ++f; } if ( valid && f != hds->size_of_faces()) verr << "counting faces failed." << std::endl; if ( valid && level >= 3 && check_tag( Supports_face_halfedge()) && n + nb != hds->size_of_halfedges()) verr << "counting halfedges via faces failed." << std::endl; valid = valid && ( f == hds->size_of_faces()); valid = valid && ( level < 3 || ! check_tag( Supports_face_halfedge()) || n + nb == hds->size_of_halfedges()); if ( level >= 4) { verr << "level 4: normalized_border_is_valid( verbose = true)" << std::endl; valid = valid && ( normalized_border_is_valid( verb)); } verr << "end of CGAL::HalfedgeDS_const_decorator::" "is_valid(): structure is " << ( valid ? "valid." : "NOT VALID.") << std::endl; return valid; } } //namespace CGAL #endif // CGAL_HALFEDGEDS_CONST_DECORATOR_H // // EOF //