+ add to_geojson method to mapnik.Feature

bindings/python/mapnik_feature.cpp

@@ -38,6 +38,7 @@
 #include <mapnik/datasource.hpp>
 #include <mapnik/wkb.hpp>
 #include <mapnik/wkt/wkt_factory.hpp>
+#include <mapnik/json/geojson_generator.hpp>
 
 namespace {
 
@@ -62,6 +63,17 @@ void feature_add_geometries_from_wkt(Feature &feature, std::string wkt)
     if (!result) throw std::runtime_error("Failed to parse WKT");
 }
 
+std::string feature_to_geojson(Feature const& feature)
+{
+    std::string json;
+    mapnik::json::geojson_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);
@@ -183,5 +195,6 @@ void export_feature()
         .def("__getitem__",&__getitem2__)
         .def("__len__", &Feature::size)
         .def("context",&Feature::context)
+        .def("to_geojson",&feature_to_geojson)
         ;
 }