add bool to_wkt(std::string & wkt, mapnik::geometry_type const& geom)

include/mapnik/util/geometry_to_wkt.hpp

@@ -0,0 +1,53 @@
+/*****************************************************************************
+ * 
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2011 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
+ *
+ *****************************************************************************/
+
+//$Id$
+
+#ifndef MAPNIK_GEOMETRY_TO_WKT_HPP
+#define MAPNIK_GEOMETRY_TO_WKT_HPP
+
+// mapnik
+#include <mapnik/global.hpp>
+#include <mapnik/geometry.hpp>
+#include <mapnik/util/vertex_iterator.hpp>
+#include <mapnik/geometry_wkt_generator.hpp>
+
+// boost
+#include <boost/spirit/include/karma.hpp>
+
+namespace mapnik { namespace util {
+
+namespace karma = boost::spirit::karma;
+
+bool to_wkt(std::string & wkt, mapnik::geometry_type const& geom)
+{
+    typedef std::back_insert_iterator<std::string> sink_type;
+    sink_type sink(wkt);
+    mapnik::util::wkt_generator<sink_type> generator;
+    bool result = karma::generate(sink, generator, geom);
+    return result;
+}
+
+}}
+
+
+#endif // MAPNIK_GEOMETRY_TO_WKT_HPP