mapnik/plugins/input/gdal/gdal_featureset.hpp

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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2007 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
*
*****************************************************************************/
//$Id$
#ifndef GDAL_FEATURESET_HPP
#define GDAL_FEATURESET_HPP
#include <mapnik/datasource.hpp>
#include <boost/variant.hpp>
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class GDALDataset;
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
{
public:
gdal_featureset(GDALDataset & dataset, int band, gdal_query q, const mapnik::box2d<double> & extent, double dx, double dy);
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virtual ~gdal_featureset();
mapnik::feature_ptr next();
private:
mapnik::feature_ptr get_feature(mapnik::query const& q);
mapnik::feature_ptr get_feature_at_point(mapnik::coord2d const& p);
void get_overview_meta(GDALRasterBand * band);
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GDALDataset & dataset_;
int band_;
gdal_query gquery_;
mapnik::box2d<double> extent_;
double dx_;
double dy_;
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bool first_;
};
#endif // GDAL_FEATURESET_HPP