68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2017 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/json/topology.hpp>
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#include <mapnik/json/topojson_utils.hpp>
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// stl
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#include <string>
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#include <vector>
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#include <fstream>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/range/adaptor/reversed.hpp>
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#pragma GCC diagnostic pop
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#include "topojson_featureset.hpp"
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topojson_featureset::topojson_featureset(mapnik::topojson::topology const& topo,
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mapnik::transcoder const& tr,
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array_type && index_array)
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: ctx_(std::make_shared<mapnik::context_type>()),
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topo_(topo),
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tr_(tr),
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index_array_(std::move(index_array)),
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index_itr_(index_array_.begin()),
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index_end_(index_array_.end()),
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feature_id_(1) {}
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topojson_featureset::~topojson_featureset() {}
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mapnik::feature_ptr topojson_featureset::next()
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{
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if (index_itr_ != index_end_)
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{
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topojson_datasource::item_type const& item = *index_itr_++;
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std::size_t index = item.second;
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if ( index < topo_.geometries.size())
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{
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mapnik::topojson::geometry const& geom = topo_.geometries[index];
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mapnik::feature_ptr feature = mapnik::util::apply_visitor(
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mapnik::topojson::feature_generator<mapnik::context_ptr>(ctx_, tr_, topo_, feature_id_++),
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geom);
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return feature;
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}
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}
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return mapnik::feature_ptr();
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}
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