mirror of https://github.com/CGAL/cgal
90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
// Copyright (c) 1997
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). 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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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-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_IO_GENERIC_WRITER_H
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#define CGAL_IO_GENERIC_WRITER_H
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#include <CGAL/Named_function_parameters.h>
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#include <CGAL/boost/graph/named_params_helper.h>
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#include <CGAL/Cartesian_converter.h>
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#include <CGAL/Simple_cartesian.h>
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#include <iostream>
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#include <iterator>
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#include <vector>
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namespace CGAL {
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template <typename Stream, typename FileWriter>
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class Generic_writer
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{
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public:
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Generic_writer(Stream& os) : m_os(os) { }
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Generic_writer(Stream& os, FileWriter writer) : m_os(os), m_writer(writer) { }
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template <typename PointRange, typename PolygonRange, typename NamedParameters>
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bool operator()(const PointRange& points,
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const PolygonRange& polygons,
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const NamedParameters& np = parameters::default_values())
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{
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typedef typename boost::range_value<PolygonRange>::type Poly;
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using parameters::choose_parameter;
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using parameters::get_parameter;
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typedef typename CGAL::GetPointMap<PointRange, NamedParameters>::type PointMap;
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PointMap point_map = choose_parameter<PointMap>(get_parameter(np, internal_np::point_map));
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if(!m_os.good())
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return false;
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set_stream_precision_from_NP(m_os, np);
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typedef typename Kernel_traits<typename boost::property_traits<PointMap>::value_type>::type K;
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typedef Simple_cartesian<double> SC;
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Cartesian_converter<K,SC> conv;
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m_writer.write_header(m_os, points.size(), 0, polygons.size());
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for(std::size_t i=0, end=points.size(); i<end; ++i)
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{
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decltype(auto) p = conv(get(point_map, points[i]));
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m_writer.write_vertex(p.x(), p.y(), p.z());
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}
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m_writer.write_facet_header();
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for(std::size_t i=0, end=polygons.size(); i<end; ++i)
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{
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const Poly& polygon = polygons[i];
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const std::size_t size = polygon.size();
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m_writer.write_facet_begin(size);
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for(std::size_t j=0; j<size; ++j)
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m_writer.write_facet_vertex_index(polygon[j]);
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m_writer.write_facet_end();
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}
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m_writer.write_footer();
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return m_os.good();
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}
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protected:
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Stream& m_os;
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FileWriter m_writer;
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};
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} // namespace CGAL
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#endif // CGAL_IO_GENERIC_WRITER_H
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