68bbcac872
ds = Shapefile(file="/../..")
for f in ds.features_at_point(Coord(-2,51)):
print f
TODO:
1.access to Feature properties
2.feature_at_point to accept screen coordinates
3.apply hit_test for geometries.
117 lines
3.7 KiB
C++
117 lines
3.7 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 Artem Pavlenko, Jean-Francois Doyon
|
|
*
|
|
* 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
|
|
*
|
|
*****************************************************************************/
|
|
//$Id$
|
|
// boost
|
|
#include <boost/python.hpp>
|
|
#include <boost/python/detail/api_placeholder.hpp>
|
|
// stl
|
|
#include <sstream>
|
|
// mapnik
|
|
#include <mapnik/envelope.hpp>
|
|
#include <mapnik/feature.hpp>
|
|
#include <mapnik/datasource.hpp>
|
|
#include <mapnik/datasource_cache.hpp>
|
|
#include <mapnik/feature_layer_desc.hpp>
|
|
|
|
namespace
|
|
{
|
|
//user-friendly wrapper that uses Python dictionary
|
|
using namespace boost::python;
|
|
boost::shared_ptr<mapnik::datasource> create_datasource(const dict& d)
|
|
{
|
|
mapnik::parameters params;
|
|
boost::python::list keys=d.keys();
|
|
for (int i=0; i<len(keys); ++i)
|
|
{
|
|
std::string key = extract<std::string>(keys[i]);
|
|
object obj = d[key];
|
|
extract<std::string> ex(obj);
|
|
if (ex.check())
|
|
{
|
|
params[key] = ex();
|
|
}
|
|
}
|
|
|
|
return mapnik::datasource_cache::create(params);
|
|
}
|
|
|
|
std::string describe(boost::shared_ptr<mapnik::datasource> const& ds)
|
|
{
|
|
std::stringstream ss;
|
|
if (ds)
|
|
{
|
|
ss << ds->get_descriptor() << "\n";
|
|
}
|
|
else
|
|
{
|
|
ss << "Null\n";
|
|
}
|
|
return ss.str();
|
|
}
|
|
}
|
|
|
|
inline object pass_through(object const& o) { return o; }
|
|
|
|
inline mapnik::feature_ptr next(mapnik::featureset_ptr const& itr)
|
|
{
|
|
mapnik::feature_ptr f = itr->next();
|
|
if (!f)
|
|
{
|
|
PyErr_SetString(PyExc_StopIteration, "No more features.");
|
|
boost::python::throw_error_already_set();
|
|
}
|
|
return f;
|
|
}
|
|
|
|
void export_datasource()
|
|
{
|
|
using namespace boost::python;
|
|
using mapnik::datasource;
|
|
using mapnik::Featureset;
|
|
using mapnik::Feature;
|
|
|
|
class_<Feature,boost::shared_ptr<Feature>,
|
|
boost::noncopyable>("Feature",no_init)
|
|
.def("id",&Feature::id)
|
|
.def("__str__",&Feature::to_string)
|
|
;
|
|
|
|
class_<Featureset,boost::shared_ptr<Featureset>,
|
|
boost::noncopyable>("Datasource",no_init)
|
|
.def("next",next)
|
|
.def("__iter__",pass_through)
|
|
;
|
|
|
|
class_<datasource,boost::shared_ptr<datasource>,
|
|
boost::noncopyable>("Datasource",no_init)
|
|
.def("envelope",&datasource::envelope)
|
|
.def("descriptor",&datasource::get_descriptor) //todo
|
|
.def("features",&datasource::features)
|
|
.def("features_at_point",&datasource::features_at_point)
|
|
.def("params",&datasource::params,return_value_policy<copy_const_reference>(),
|
|
"The configuration parameters of the data source. "
|
|
"These vary depending on the type of data source.")
|
|
;
|
|
|
|
def("Describe",&describe);
|
|
def("CreateDatasource",&create_datasource);
|
|
}
|