/***************************************************************************** * * This file is part of Mapnik (c++ mapping toolkit) * * Copyright (C) 2015 Artem Pavlenko * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * *****************************************************************************/ // mapnik #include <mapnik/json/topology.hpp> #include <mapnik/json/topojson_utils.hpp> // stl #include <string> #include <vector> #include <fstream> #pragma GCC diagnostic push #include <mapnik/warning_ignore.hpp> #include <boost/range/adaptor/reversed.hpp> #pragma GCC diagnostic pop #include "topojson_featureset.hpp" topojson_featureset::topojson_featureset(mapnik::topojson::topology const& topo, mapnik::transcoder const& tr, array_type && index_array) : ctx_(std::make_shared<mapnik::context_type>()), topo_(topo), tr_(tr), index_array_(std::move(index_array)), index_itr_(index_array_.begin()), index_end_(index_array_.end()), feature_id_(1) {} topojson_featureset::~topojson_featureset() {} mapnik::feature_ptr topojson_featureset::next() { if (index_itr_ != index_end_) { topojson_datasource::item_type const& item = *index_itr_++; std::size_t index = item.second; if ( index < topo_.geometries.size()) { mapnik::topojson::geometry const& geom = topo_.geometries[index]; mapnik::feature_ptr feature = mapnik::util::apply_visitor( mapnik::topojson::feature_generator<mapnik::context_ptr>(ctx_, tr_, topo_, feature_id_++), geom); return feature; } } return mapnik::feature_ptr(); }