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45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Unit Test
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// Copyright (c) 2014-2022 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_TEST_READ_FROM_WKT_FILE_HPP
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#define BOOST_GEOMETRY_TEST_READ_FROM_WKT_FILE_HPP
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#include <boost/geometry/io/wkt/wkt.hpp>
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#include <fstream>
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#include <string>
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// Reads all geometries from WKT file and return it as one big multi polygon WKT
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template <typename MultiPolygon>
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inline std::string read_from_wkt_file(std::string const& filename)
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{
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MultiPolygon mp;
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std::ifstream in(filename.c_str());
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while (in.good())
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{
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std::string line;
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std::getline(in, line);
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if (! line.empty() && line.substr(0, 1) != "#")
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{
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typename boost::range_value<MultiPolygon>::type geometry;
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bg::read_wkt(line, geometry);
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mp.push_back(geometry);
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}
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}
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std::ostringstream out;
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if (! mp.empty())
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{
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out << std::fixed << std::setprecision(20) << bg::wkt(mp);
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}
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return out.str();
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}
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#endif
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