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mapnik_feature.cpp
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mapnik_feature.cpp
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/*****************************************************************************
*
* 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
*
*****************************************************************************/
// boost
#include <boost/python/suite/indexing/indexing_suite.hpp>
//#include <boost/python/suite/indexing/map_indexing_suite.hpp>
#include <boost/python/iterator.hpp>
#include <boost/python/call_method.hpp>
#include <boost/python/tuple.hpp>
#include <boost/python/to_python_converter.hpp>
#include <boost/python.hpp>
// mapnik
#include <mapnik/feature.hpp>
#include <mapnik/feature_kv_iterator.hpp>
#include <mapnik/datasource.hpp>
#include <mapnik/wkb.hpp>
#include <mapnik/wkt/wkt_factory.hpp>
#include <mapnik/json/geojson_generator.hpp>
namespace {
using mapnik::Feature;
using mapnik::geometry_utils;
using mapnik::from_wkt;
using mapnik::context_type;
using mapnik::context_ptr;
using mapnik::feature_kv_iterator;
mapnik::geometry_type const& (mapnik::Feature::*get_geometry_by_const_ref)(unsigned) const = &mapnik::Feature::get_geometry;
boost::ptr_vector<mapnik::geometry_type> const& (mapnik::Feature::*get_paths_by_const_ref)() const = &mapnik::Feature::paths;
void feature_add_geometries_from_wkb(Feature &feature, std::string wkb)
{
geometry_utils::from_wkb(feature.paths(), wkb.c_str(), wkb.size());
}
void feature_add_geometries_from_wkt(Feature &feature, std::string wkt)
{
bool result = mapnik::from_wkt(wkt, feature.paths());
if (!result) throw std::runtime_error("Failed to parse WKT");
}
std::string feature_to_geojson(Feature const& feature)
{
std::string json;
mapnik::json::feature_generator g;
if (!g.generate(json,feature))
{
throw std::runtime_error("Failed to generate GeoJSON");
}
return json;
}
mapnik::value __getitem__(Feature const& feature, std::string const& name)
{
return feature.get(name);
}
mapnik::value __getitem2__(Feature const& feature, std::size_t index)
{
return feature.get(index);
}
void __setitem__(Feature & feature, std::string const& name, mapnik::value const& val)
{
feature.put_new(name,val);
}
boost::python::dict attributes(Feature const& f)
{
boost::python::dict attributes;
feature_kv_iterator itr = f.begin();
feature_kv_iterator end = f.end();
for ( ;itr!=end; ++itr)
{
attributes[boost::get<0>(*itr)] = boost::get<1>(*itr);
}
return attributes;
}
} // end anonymous namespace
struct UnicodeString_from_python_str
{
UnicodeString_from_python_str()
{
boost::python::converter::registry::push_back(
&convertible,
&construct,
boost::python::type_id<UnicodeString>());
}
static void* convertible(PyObject* obj_ptr)
{
if (!(
#if PY_VERSION_HEX >= 0x03000000
PyBytes_Check(obj_ptr)
#else
PyString_Check(obj_ptr)
#endif
|| PyUnicode_Check(obj_ptr)))
return 0;
return obj_ptr;
}
static void construct(
PyObject* obj_ptr,
boost::python::converter::rvalue_from_python_stage1_data* data)
{
char * value=0;
if (PyUnicode_Check(obj_ptr)) {
PyObject *encoded = PyUnicode_AsEncodedString(obj_ptr, "utf8", "replace");
if (encoded) {
#if PY_VERSION_HEX >= 0x03000000
value = PyBytes_AsString(encoded);
#else
value = PyString_AsString(encoded);
#endif
Py_DecRef(encoded);
}
} else {
#if PY_VERSION_HEX >= 0x03000000
value = PyBytes_AsString(obj_ptr);
#else
value = PyString_AsString(obj_ptr);
#endif
}
if (value == 0) boost::python::throw_error_already_set();
void* storage = (
(boost::python::converter::rvalue_from_python_storage<UnicodeString>*)
data)->storage.bytes;
new (storage) UnicodeString(value);
data->convertible = storage;
}
};
void export_feature()
{
using namespace boost::python;
using mapnik::Feature;
// Python to mapnik::value converters
implicitly_convertible<int,mapnik::value>();
implicitly_convertible<double,mapnik::value>();
implicitly_convertible<UnicodeString,mapnik::value>();
implicitly_convertible<bool,mapnik::value>();
UnicodeString_from_python_str();
class_<context_type,context_ptr,boost::noncopyable>
("Context",init<>("Default ctor."))
.def("push", &context_type::push)
;
class_<Feature,boost::shared_ptr<Feature>,
boost::noncopyable>("Feature",init<context_ptr,int>("Default ctor."))
.def("id",&Feature::id)
.def("__str__",&Feature::to_string)
.def("add_geometries_from_wkb", &feature_add_geometries_from_wkb)
.def("add_geometries_from_wkt", &feature_add_geometries_from_wkt)
.def("add_geometry", &Feature::add_geometry)
.def("num_geometries",&Feature::num_geometries)
.def("get_geometry", make_function(get_geometry_by_const_ref,return_value_policy<reference_existing_object>()))
.def("geometries",make_function(get_paths_by_const_ref,return_value_policy<reference_existing_object>()))
.def("envelope", &Feature::envelope)
.def("has_key", &Feature::has_key)
.add_property("attributes",&attributes)
.def("__setitem__",&__setitem__)
.def("__getitem__",&__getitem__)
.def("__getitem__",&__getitem2__)
.def("__len__", &Feature::size)
.def("context",&Feature::context)
.def("to_geojson",&feature_to_geojson)
;
}