8010d5433f
2. Pass resolution to bbox query
3. Use variant<int,double,string> as parameter value e.g in Python:
ds = Raster(file="/path/to/file",lox = 12312.4,.....)
Added extractor facility to work with mapnik::parameter (C++):
mapnik::parameters params;
params["parameter0"] = 123.456;
params["parameter1"] = "123.456"; // initialize with string extract double later
boost::optional<double> val0 = params.get<double>("parameter0");
if (val0)
{
std::cout << *val0;
}
// with default value. NOTE: there is no 'parameter2' in params
boost::optional<double> val2 = params.get<double>("parameter2",654.321);
std::cout << * val2;
//
4. Added Gdal factory method in __init__.py
ds = Gdal(file="/tmp/file.tiff")
94 lines
2.7 KiB
C++
94 lines
2.7 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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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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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> paramater");
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dataset_ = boost::shared_ptr<GDALDataset>(reinterpret_cast<GDALDataset*>(GDALOpen((*file).c_str(),GA_ReadOnly)));
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if (!dataset_) throw datasource_exception("failed to create GDALDataset");
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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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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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