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73 lines
2.4 KiB
C++
73 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) 2025 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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#ifndef VECTOR_TILES_FEATURESET_HPP
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#define VECTOR_TILES_FEATURESET_HPP
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#include <memory>
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// mapnik
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#include <mapnik/feature.hpp>
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#include <mapnik/datasource.hpp>
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#include "mvt_io.hpp"
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namespace mapnik {
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class tiles_source; // fwd decl
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}
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class vector_tiles_featureset : public mapnik::Featureset
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{
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public:
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vector_tiles_featureset(std::shared_ptr<mapnik::tiles_source> source_ptr,
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mapnik::context_ptr const& ctx,
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int const zoom,
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mapnik::box2d<double> const& extent,
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std::string const& layer,
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std::unordered_map<std::string, std::string>& vector_tile_cache,
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std::size_t datasource_hash);
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virtual ~vector_tiles_featureset();
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mapnik::feature_ptr next();
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private:
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mapnik::feature_ptr next_feature();
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bool valid() const;
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std::shared_ptr<mapnik::tiles_source> source_ptr_;
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mapnik::context_ptr context_;
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int zoom_;
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mapnik::box2d<double> extent_;
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std::string const layer_;
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std::unique_ptr<mvt_io> vector_tile_;
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std::unordered_map<std::string, std::string>& vector_tile_cache_;
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int xmin_;
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int xmax_;
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int ymin_;
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int ymax_;
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/// x index of the currently accessed tile
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int x_ = 0;
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/// y index of the currently accessed tile
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int y_ = 0;
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std::size_t datasource_hash_;
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bool next_tile();
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bool open_tile();
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};
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#endif // VECTOR_TILES_FEATURESET_HPP
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