bb235fa316
Map and Layer objects both have a new parameter 'srs', initialized to "+proj=latlong +datum=WGS84" by default.
Basic usage (Python):
p = Projection("+proj=merc +datum=WGS84")
point = p.forward(Coord(-2,51))
...
2.reflected arithmetic operators for Envelope/Coord into Python
3.altered return policies for python objects
4.modified build system to require proj4 lib and headers
68 lines
2.4 KiB
C++
68 lines
2.4 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) 2006 Artem Pavlenko, Jean-Francois Doyon
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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 <boost/python.hpp>
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#include <mapnik/envelope.hpp>
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#include <mapnik/datasource.hpp>
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#include <mapnik/datasource_cache.hpp>
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namespace
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{
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//user-friendly wrapper that uses Python dictionary
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using namespace boost::python;
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boost::shared_ptr<mapnik::datasource> create_datasource(const dict& d)
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{
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mapnik::parameters params;
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boost::python::list keys=d.keys();
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for (int i=0; i<len(keys); ++i)
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{
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std::string key = extract<std::string>(keys[i]);
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object obj = d[key];
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extract<std::string> ex(obj);
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if (ex.check())
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{
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params[key] = ex();
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}
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}
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return mapnik::datasource_cache::create(params);
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}
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}
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void export_datasource()
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{
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using namespace boost::python;
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using mapnik::datasource;
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class_<datasource,boost::shared_ptr<datasource>,
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boost::noncopyable>("Datasource",no_init)
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.def("envelope",&datasource::envelope,
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return_value_policy<copy_const_reference>())
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.def("features",&datasource::features)
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.def("params",&datasource::params,return_value_policy<copy_const_reference>(),
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"The configuration parameters of the data source. "
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"These vary depending on the type of data source.")
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;
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def("CreateDatasource",&create_datasource);
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}
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