3805ee0fab
+ introduced some more code for supporting overviews (still commented out as default, need revision)
119 lines
3.2 KiB
C++
119 lines
3.2 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) 2007 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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// $Id$
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#include "gdal_datasource.hpp"
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#include "gdal_featureset.hpp"
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// mapnik
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#include <mapnik/ptree_helpers.hpp>
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#include <mapnik/geom_util.hpp>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(gdal_datasource)
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using mapnik::Envelope;
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using mapnik::coord2d;
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using mapnik::query;
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using mapnik::featureset_ptr;
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using mapnik::layer_descriptor;
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using mapnik::datasource_exception;
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gdal_datasource::gdal_datasource(parameters const& params)
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: datasource(params),
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extent_(),
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dataset_(0),
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desc_(*params.get<std::string>("type"),"utf-8")
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{
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GDALAllRegister();
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boost::optional<std::string> file = params.get<std::string>("file");
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if (!file) throw datasource_exception("missing <file> parameter");
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boost::optional<std::string> base = params.get<std::string>("base");
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if (base)
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dataset_name_ = *base + "/" + *file;
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else
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dataset_name_ = *file;
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shared_dataset_ = *params_.get<mapnik::boolean>("shared",false);
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#if GDAL_VERSION_NUM >= 1600
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if (shared_dataset_)
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dataset_ = reinterpret_cast<GDALDataset*>(GDALOpenShared((dataset_name_).c_str(),GA_ReadOnly));
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else
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#endif
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dataset_ = reinterpret_cast<GDALDataset*>(GDALOpen((dataset_name_).c_str(),GA_ReadOnly));
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if (! dataset_) throw datasource_exception(CPLGetLastErrorMsg());
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double tr[6];
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dataset_->GetGeoTransform(tr);
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double x0 = tr[0];
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double y0 = tr[3];
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double x1 = tr[0] + dataset_->GetRasterXSize()*tr[1] + dataset_->GetRasterYSize()*tr[2];
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double y1 = tr[3] + dataset_->GetRasterXSize()*tr[4] + dataset_->GetRasterYSize()*tr[5];
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extent_.init(x0,y0,x1,y1);
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}
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gdal_datasource::~gdal_datasource()
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{
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GDALClose (dataset_);
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}
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int gdal_datasource::type() const
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{
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return datasource::Raster;
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}
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std::string gdal_datasource::name()
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{
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return "gdal";
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}
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Envelope<double> gdal_datasource::envelope() const
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{
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return extent_;
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}
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layer_descriptor gdal_datasource::get_descriptor() const
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{
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return desc_;
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}
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featureset_ptr gdal_datasource::features(query const& q) const
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{
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if (dataset_)
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{
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return featureset_ptr(new gdal_featureset(*dataset_, q));
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}
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return featureset_ptr();
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}
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featureset_ptr gdal_datasource::features_at_point(coord2d const& pt) const
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{
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return featureset_ptr();
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}
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