96 lines
2.8 KiB
C++
96 lines
2.8 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) 2011 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 GDAL_FEATURESET_HPP
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#define GDAL_FEATURESET_HPP
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// mapnik
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#include <mapnik/feature.hpp>
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// boost
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#include <boost/variant.hpp>
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#include <boost/optional.hpp>
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#include "gdal_datasource.hpp"
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class GDALDataset;
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class GDALRasterBand;
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typedef boost::variant<mapnik::query, mapnik::coord2d> gdal_query;
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class gdal_featureset : public mapnik::Featureset
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{
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struct query_dispatch : public boost::static_visitor<mapnik::feature_ptr>
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{
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query_dispatch( gdal_featureset & featureset)
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: featureset_(featureset) {}
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mapnik::feature_ptr operator() (mapnik::query const& q) const
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{
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return featureset_.get_feature(q);
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}
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mapnik::feature_ptr operator() (mapnik::coord2d const& p) const
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{
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return featureset_.get_feature_at_point(p);
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}
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gdal_featureset & featureset_;
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};
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public:
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gdal_featureset(GDALDataset& dataset,
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int band,
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gdal_query q,
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mapnik::box2d<double> extent,
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unsigned width,
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unsigned height,
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int nbands,
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double dx,
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double dy,
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boost::optional<double> const& nodata);
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virtual ~gdal_featureset();
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mapnik::feature_ptr next();
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private:
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mapnik::feature_ptr get_feature(mapnik::query const& q);
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mapnik::feature_ptr get_feature_at_point(mapnik::coord2d const& p);
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#ifdef MAPNIK_LOG
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void get_overview_meta(GDALRasterBand * band);
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#endif
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GDALDataset & dataset_;
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mapnik::context_ptr ctx_;
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int band_;
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gdal_query gquery_;
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mapnik::box2d<double> raster_extent_;
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unsigned raster_width_;
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unsigned raster_height_;
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double dx_;
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double dy_;
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int nbands_;
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boost::optional<double> nodata_value_;
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bool first_;
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};
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#endif // GDAL_FEATURESET_HPP
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