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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
*
*****************************************************************************/
// $Id$
#include "gdal_datasource.hpp"
#include "gdal_featureset.hpp"
using mapnik::datasource;
using mapnik::parameters;
DATASOURCE_PLUGIN(gdal_datasource)
using mapnik::Envelope;
using mapnik::coord2d;
using mapnik::query;
using mapnik::featureset_ptr;
using mapnik::layer_descriptor;
using mapnik::datasource_exception;
gdal_datasource::gdal_datasource( parameters const& params)
: datasource(params),
extent_(),
desc_(*params.get<std::string>("type"),"utf-8")
{
GDALAllRegister();
boost::optional<std::string> file = params.get<std::string>("file");
if (!file) throw datasource_exception("missing <file> paramater");
dataset_ = boost::shared_ptr<GDALDataset>(reinterpret_cast<GDALDataset*>(GDALOpen((*file).c_str(),GA_ReadOnly)));
if (!dataset_) throw datasource_exception("failed to create GDALDataset");
double tr[6];
dataset_->GetGeoTransform(tr);
double x0 = tr[0];
double y0 = tr[3];
double x1 = tr[0] + dataset_->GetRasterXSize()*tr[1] + dataset_->GetRasterYSize()*tr[2];
double y1 = tr[3] + dataset_->GetRasterXSize()*tr[4] + dataset_->GetRasterYSize()*tr[5];
extent_.init(x0,y0,x1,y1);
}
gdal_datasource::~gdal_datasource() {}
int gdal_datasource::type() const
{
return datasource::Raster;
}
std::string gdal_datasource::name()
{
return "gdal";
}
Envelope<double> gdal_datasource::envelope() const
{
return extent_;
}
layer_descriptor gdal_datasource::get_descriptor() const
{
return desc_;
}
featureset_ptr gdal_datasource::features(query const& q) const
{
if (dataset_)
{
return featureset_ptr(new gdal_featureset(*dataset_, q));
}
return featureset_ptr();
}
featureset_ptr gdal_datasource::features_at_point(coord2d const& pt) const
{
return featureset_ptr();
}
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