91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
// Copyright (c) 1997 ETH Zurich (Switzerland).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Polyhedron/include/CGAL/Polyhedron_copy_3.h $
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// $Id: Polyhedron_copy_3.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Lutz Kettner <kettner@mpi-sb.mpg.de>)
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#ifndef CGAL_POLYHEDRON_COPY_3_H
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#define CGAL_POLYHEDRON_COPY_3_H 1
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#include <CGAL/license/Polyhedron.h>
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#include <CGAL/basic.h>
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#include <CGAL/Modifier_base.h>
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#include <CGAL/Inverse_index.h>
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#include <CGAL/Polyhedron_incremental_builder_3.h>
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#include <CGAL/Cartesian_converter.h>
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#include <CGAL/Kernel_traits.h>
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namespace CGAL {
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template < class Poly, class HDS, bool clear_target_before = true >
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class Polyhedron_copy_3 : public Modifier_base<HDS> {
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protected:
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const Poly& source;
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public:
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typedef Poly Polyhedron;
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typedef HDS Halfedge_data_structure;
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Polyhedron_copy_3( const Polyhedron& poly) : source(poly) {}
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// creates the copy modifier and stores the `source' in its
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// internal state.
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void operator()( HDS& target);
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// copies the `source' known from creation time into the `target'.
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// Postcondition: the `target' is a valid polyhedral surface.
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};
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template < class Poly, class HDS, bool clear_target_before>
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void
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Polyhedron_copy_3<Poly,HDS,clear_target_before>::operator()(HDS& target) {
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typedef typename Poly::Vertex_const_iterator Vertex_const_iterator;
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typedef typename Poly::Facet_const_iterator Facet_const_iterator;
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typedef Inverse_index< Vertex_const_iterator> Index;
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Cartesian_converter<
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typename Kernel_traits<typename Poly::Vertex::Point>::Kernel,
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typename Kernel_traits<typename HDS::Vertex::Point>::Kernel
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> convert;
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if ( clear_target_before )
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target.clear();
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Polyhedron_incremental_builder_3<HDS> B( target);
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B.begin_surface( source.size_of_vertices(),
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source.size_of_facets(),
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source.size_of_halfedges());
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for ( Vertex_const_iterator vi = source.vertices_begin();
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vi != source.vertices_end();
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++vi) {
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B.add_vertex( convert( vi->point()));
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}
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Index index( source.vertices_begin(), source.vertices_end());
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for ( Facet_const_iterator fi = source.facets_begin();
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fi != source.facets_end();
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++fi) {
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B.begin_facet();
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typedef typename Poly::Halfedge_around_facet_const_circulator
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Halfedge_around_facet_const_circulator;
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Halfedge_around_facet_const_circulator hc = fi->facet_begin();
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Halfedge_around_facet_const_circulator hc_end = hc;
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CGAL_assertion( hc != nullptr);
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do {
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B.add_vertex_to_facet( index[ hc->vertex()]);
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++hc;
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} while( hc != hc_end);
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B.end_facet();
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}
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B.end_surface();
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target.normalize_border();
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}
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} //namespace CGAL
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#endif // CGAL_POLYHEDRON_COPY_3_H //
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// EOF //
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