125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
/* -*-c++-*- */
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/* osgEarth - Geospatial SDK for OpenSceneGraph
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* Copyright 2008-2014 Pelican Mapping
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* http://osgearth.org
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*
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* osgEarth is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU 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 License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef OSGEARTH_FEATURES_MVT
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#define OSGEARTH_FEATURES_MVT 1
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#include <osgEarth/Common>
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#ifdef OSGEARTH_HAVE_MVT
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#include <osgEarth/FeatureSource>
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namespace osgEarth { namespace MVT
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{
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//! Reads features from an MVT stream for the specified tile.
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extern OSGEARTH_EXPORT bool readTile(
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std::istream& in,
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const TileKey& key,
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FeatureList& features);
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// Internal serialization options
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class OSGEARTH_EXPORT MVTFeatureSourceOptions : public FeatureSource::Options
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{
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public:
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META_LayerOptions(osgEarth, MVTFeatureSourceOptions, FeatureSource::Options);
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OE_OPTION(URI, url);
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OE_OPTION(int, minLevel);
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OE_OPTION(int, maxLevel);
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virtual Config getConfig() const;
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private:
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void fromConfig(const Config& conf);
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};
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} } // osgEarth::MVT
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namespace osgEarth
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{
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/**
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* Feature Layer that accesses features according to the Mapnik Vector Tiles specification.
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*/
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class OSGEARTH_EXPORT MVTFeatureSource : public FeatureSource
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{
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public: // serialization
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typedef MVT::MVTFeatureSourceOptions Options;
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public:
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META_Layer(osgEarth, MVTFeatureSource, Options, FeatureSource, MVTFeatures);
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//! Location of the resource
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void setURL(const URI& value);
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const URI& getURL() const;
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//! Minimum level of detail to access
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void setMinLevel(const int& value);
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const int& getMinLevel() const;
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//! Maximum level of detail to access
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void setMaxLevel(const int& value);
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const int& getMaxLevel() const;
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typedef void(*FeatureTileCallback)(const TileKey& key, const FeatureList& features, void* context);
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/**
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* Iterates over the tiles in the mbtiles dataset
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*/
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void iterateTiles(int zoomLevel, int limit, int offset, const GeoExtent& extent, FeatureTileCallback callback, void* context);
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public: // Layer
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Status openImplementation() override;
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Status closeImplementation() override;
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protected:
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void init() override;
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public: // FeatureSource
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FeatureCursor* createFeatureCursorImplementation(const Query& query, ProgressCallback* progress) const override;
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const FeatureSchema& getSchema() const override { return _schema; }
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protected:
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virtual ~MVTFeatureSource();
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private:
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FeatureSchema _schema;
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osg::ref_ptr<osgDB::BaseCompressor> _compressor;
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void* _database;
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unsigned _minLevel;
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unsigned _maxLevel;
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const FeatureProfile* createFeatureProfile();
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void computeLevels();
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bool getMetaData(const std::string& key, std::string& value);
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void closeDatabase();
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};
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}
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OSGEARTH_SPECIALIZE_CONFIG(osgEarth::MVTFeatureSource::Options);
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#else
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#pragma message("osgEarth was not built with MVT support")
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#endif
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#endif // OSGEARTH_FEATURES_MVT
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