+ reflect mapnik::proj_transform in Python (#117)

bindings/python/mapnik_proj_transform.cpp

@@ -0,0 +1,60 @@
+/*****************************************************************************
+ * 
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2009 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
+ *
+ *****************************************************************************/
+//$Id$
+
+// mapnik
+#include <mapnik/proj_transform.hpp>
+// boost
+#include <boost/python.hpp>
+
+namespace  {
+
+   mapnik::coord2d forward_transform(mapnik::proj_transform& t, mapnik::coord2d const& c)
+   {
+      double x = c.x;
+      double y = c.y;
+      double z = 0.0;
+      t.forward(x,y,z);
+      return mapnik::coord2d(x,y);
+   }
+   
+   mapnik::coord2d backward_transform(mapnik::proj_transform& t, mapnik::coord2d const& c)
+   {
+      double x = c.x;
+      double y = c.y;
+      double z = 0.0;
+      t.backward(x,y,z);
+      return mapnik::coord2d(x,y);
+   }
+}
+
+void export_proj_transform ()
+{
+    using namespace boost::python; 
+    using mapnik::proj_transform;
+    using mapnik::projection;
+    class_<proj_transform, boost::noncopyable>("ProjTransform", init< projection const&, projection const& >())
+       .def("forward", forward_transform)
+       .def("backward",backward_transform)
+       ;
+    
+}

bindings/python/mapnik_python.cpp

@@ -56,6 +56,7 @@ void export_text_symbolizer();
 void export_shield_symbolizer();
 void export_font_engine();
 void export_projection();
+void export_proj_transform();
 
 #include <mapnik/map.hpp>
 #include <mapnik/agg_renderer.hpp>
@@ -186,6 +187,7 @@ BOOST_PYTHON_MODULE(_mapnik)
     export_shield_symbolizer();
     export_font_engine();
     export_projection();
+    export_proj_transform();
     export_coord();
     export_map();