mirror of https://github.com/CGAL/cgal
227 lines
7.4 KiB
C++
227 lines
7.4 KiB
C++
// Copyright (c) 2015 GeometryFactory (France). 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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// Author(s) : Andreas Fabri
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#ifndef CGAL_BGL_IO_OFF_H
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#define CGAL_BGL_IO_OFF_H
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#include <CGAL/boost/graph/IO/Generic_facegraph_builder.h>
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#include <CGAL/IO/OFF.h>
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#include <CGAL/assertions.h>
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#include <CGAL/boost/graph/Euler_operations.h>
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#include <CGAL/boost/graph/Named_function_parameters.h>
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#include <CGAL/boost/graph/named_params_helper.h>
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#include <boost/container/flat_map.hpp>
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#include <fstream>
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#include <iostream>
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#include <string>
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// @todo reintroduce deprecated versions of the functions using lower case file formats
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namespace CGAL {
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////////////////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Read
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namespace IO {
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namespace internal {
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// Use CRTP to gain access to the protected members without getters/setters.
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template <typename FaceGraph, typename Point>
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class OFF_builder
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: public Generic_facegraph_builder<FaceGraph, Point, OFF_builder<FaceGraph, Point> >
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{
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typedef OFF_builder<FaceGraph, Point> Self;
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typedef Generic_facegraph_builder<FaceGraph, Point, Self> Base;
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typedef typename Base::Point_container Point_container;
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typedef typename Base::Face Face;
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typedef typename Base::Face_container Face_container;
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public:
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OFF_builder(std::istream& is_) : Base(is_) { }
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bool read(std::istream& input, Point_container& points, Face_container& faces)
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{
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return read_OFF(input, points, faces);
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}
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};
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} // namespace internal
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} // namespace IO
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/*!
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\ingroup PkgBGLIOFct
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reads the graph `g` from data in the OFF format. Ignores comment lines which start with a hash, and lines with whitespace.
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\cgalNamedParamsBegin
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\cgalParamBegin{vertex_point_map} the property map with the points associated to the vertices of `g`.
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If this parameter is omitted, an internal property map for
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`CGAL::vertex_point_t` should be available in `FaceGraph`\cgalParamEnd
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\cgalNamedParamsEnd
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\sa Overloads of this function for specific models of the concept `FaceGraph`.
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\pre The data must represent a 2-manifold
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\see \ref IOStreamOFF
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*/
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template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
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bool read_OFF(std::istream& in,
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FaceGraph& g,
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const CGAL_BGL_NP_CLASS& np)
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{
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typedef typename CGAL::GetVertexPointMap<FaceGraph, CGAL_BGL_NP_CLASS>::type VPM;
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typedef typename boost::property_traits<VPM>::value_type Point;
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IO::internal::OFF_builder<FaceGraph, Point> builder(in);
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return builder(g, np);
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}
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/*!
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\ingroup PkgBGLIOFct
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reads the graph `g` from data in the OFF format. Ignores comment lines which start with a hash,
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and lines with whitespace.
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\sa Overloads of this function for specific models of the concept `FaceGraph`.
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\pre The data must represent a 2-manifold
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\attention The graph `g` is not cleared, and the data from the stream are added.
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\see \ref IOStreamOFF
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*/
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template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
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bool read_OFF(const char* fname,
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FaceGraph& g,
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const CGAL_BGL_NP_CLASS& np)
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{
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std::ifstream in(fname);
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return read_OFF(in, g, np);
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}
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template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
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bool read_OFF(const std::string& fname, FaceGraph& g, const CGAL_BGL_NP_CLASS& np)
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{
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return read_OFF(fname.c_str(), g, np);
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}
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template <typename FaceGraph>
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bool read_OFF(std::istream& is, FaceGraph& g) { return read_OFF(is, g, parameters::all_default()); }
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template <typename FaceGraph>
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bool read_OFF(const char* fname, FaceGraph& g) { return read_OFF(fname, g, parameters::all_default()); }
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template <typename FaceGraph>
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bool read_OFF(const std::string& fname, FaceGraph& g) { return read_OFF(fname, g, parameters::all_default()); }
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////////////////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Write
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/*!
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\ingroup PkgBGLIOFct
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writes the graph `g` in the OFF format.
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\cgalNamedParamsBegin
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\cgalParamBegin{vertex_point_map} the property map with the points associated to the vertices of `g`.
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If this parameter is omitted, an internal property map for
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`CGAL::vertex_point_t` should be available in `FaceGraph`
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\cgalParamEnd
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\cgalNamedParamsEnd
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\sa Overloads of this function for specific models of the concept `FaceGraph`.
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\see \ref IOStreamOFF
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*/
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template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
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bool write_OFF(std::ostream& os,
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const FaceGraph& g,
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const CGAL_BGL_NP_CLASS& np)
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{
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typedef typename boost::graph_traits<FaceGraph>::vertex_descriptor vertex_descriptor;
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typedef typename boost::graph_traits<FaceGraph>::face_descriptor face_descriptor;
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typedef typename boost::graph_traits<FaceGraph>::vertices_size_type vertices_size_type;
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typedef typename boost::graph_traits<FaceGraph>::faces_size_type faces_size_type;
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using parameters::choose_parameter;
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using parameters::get_parameter;
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typename CGAL::GetVertexPointMap<FaceGraph, CGAL_BGL_NP_CLASS>::const_type
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vpm = choose_parameter(get_parameter(np, internal_np::vertex_point),
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get_const_property_map(CGAL::vertex_point, g));
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vertices_size_type nv = static_cast<vertices_size_type>(std::distance(vertices(g).first, vertices(g).second));
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faces_size_type nf = static_cast<faces_size_type>(std::distance(faces(g).first, faces(g).second));
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if(!os.good())
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return false;
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os << "OFF\n"
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<< nv << " " << nf << " 0\n";
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boost::container::flat_map<vertex_descriptor, vertices_size_type> reindex;
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int n = 0;
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for(vertex_descriptor v : vertices(g))
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{
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os << get(vpm, v) << '\n';
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reindex[v] = n++;
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}
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for(face_descriptor f : faces(g))
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{
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os << degree(f, g);
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for(vertex_descriptor v : vertices_around_face(halfedge(f, g), g))
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os << " " << reindex[v];
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os << '\n';
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}
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return os.good();
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}
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/*!
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\ingroup PkgBGLIOFct
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writes the graph `g` in the OFF format into a file named `fname`.
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\sa Overloads of this function for specific models of the concept `FaceGraph`.
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\see \ref IOStreamOFF
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*/
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template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
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bool write_OFF(const char* fname,
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const FaceGraph& g,
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const CGAL_BGL_NP_CLASS& np)
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{
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std::ofstream out(fname);
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return write_OFF(out, g, np);
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}
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template <typename FaceGraph, typename CGAL_BGL_NP_TEMPLATE_PARAMETERS>
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bool write_OFF(const std::string& fname, const FaceGraph& g, const CGAL_BGL_NP_CLASS& np)
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{
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return write_OFF(fname.c_str(), g, np);
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}
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template <typename FaceGraph>
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bool write_OFF(std::ostream& os, const FaceGraph& g) { return write_OFF(os, g, parameters::all_default()); }
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template <typename FaceGraph>
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bool write_OFF(const char* fname, const FaceGraph& g) { return write_OFF(fname, g, parameters::all_default()); }
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template <typename FaceGraph>
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bool write_OFF(const std::string& fname, const FaceGraph& g) { return write_OFF(fname, g, parameters::all_default()); }
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} // namespace CGAL
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#endif // CGAL_BGL_IO_OFF_H
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