+ geojson generator interface

bindings/python/build.py

@@ -194,6 +194,7 @@ if env['HAS_PYCAIRO']:
     py_env.ParseConfig('pkg-config --cflags pycairo')
     py_env.Append(CXXFLAGS = '-DHAVE_PYCAIRO')
 
+libraries.append('boost_thread%s' % env['BOOST_APPEND'])
 _mapnik = py_env.LoadableModule('mapnik/_mapnik', sources, LIBS=libraries, LDMODULEPREFIX='', LDMODULESUFFIX='.so',LINKFLAGS=linkflags)
 
 Depends(_mapnik, env.subst('../../src/%s' % env['MAPNIK_LIB_NAME']))

include/mapnik/json/geojson_generator.hpp

@@ -0,0 +1,48 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2012 Artem Pavlenko
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_GEOJSON_GENERATOR_HPP
+#define MAPNIK_GEOJSON_GENERATOR_HPP
+
+#include <mapnik/feature.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <string>
+
+namespace mapnik { namespace json {
+
+template <typename OutputIterator> struct feature_generator;
+
+class geojson_generator 
+{
+    typedef std::back_insert_iterator<std::string> sink_type;
+public:
+    geojson_generator();
+    ~geojson_generator();
+    bool generate(std::string & geojson, mapnik::Feature const& f);
+private:
+    boost::scoped_ptr<feature_generator<sink_type> > grammar_;
+};
+
+}}
+
+
+#endif //MAPNIK_GEOJSON_GENERATOR_HPP

src/build.py

@@ -162,6 +162,7 @@ source = Split(
     svg_transform_parser.cpp
     warp.cpp
     json/feature_collection_parser.cpp
+    json/geojson_generator.cpp
     markers_placement.cpp
     processed_text.cpp
     formatting/base.cpp

src/json/geojson_generator.cpp

@@ -0,0 +1,40 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2012 Artem Pavlenko
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+#include <mapnik/json/geojson_generator.hpp>
+#include <mapnik/json/feature_generator.hpp>
+#include <boost/spirit/include/karma.hpp>
+
+namespace  mapnik { namespace json {
+
+geojson_generator::geojson_generator()
+    : grammar_(new feature_generator<sink_type>()) {}
+ 
+geojson_generator::~geojson_generator() {}
+
+bool geojson_generator::generate(std::string & geojson, mapnik::Feature const& f)
+{
+    sink_type sink(geojson);
+    return karma::generate(sink, *grammar_,f);
+}
+
+}}