Upgrade to use new APIs [skip ci]

Author: artemp

src/mapnik_proj_transform.cpp

@@ -48,7 +48,7 @@ struct proj_transform_pickle_suite : boost::python::pickle_suite
     getinitargs(const proj_transform& p)
     {
         using namespace boost::python;
-        return boost::python::make_tuple(p.source(),p.dest());
+        return boost::python::make_tuple(p.definition());
     }
 };
 
@@ -62,7 +62,7 @@ mapnik::coord2d forward_transform_c(mapnik::proj_transform& t, mapnik::coord2d c
     if (!t.forward(x,y,z)) {
         std::ostringstream s;
         s << "Failed to forward project "
-          << "from " << t.source().params() << " to: " << t.dest().params();
+          << t.definition();
         throw std::runtime_error(s.str());
     }
     return mapnik::coord2d(x,y);
@@ -76,7 +76,7 @@ mapnik::coord2d backward_transform_c(mapnik::proj_transform& t, mapnik::coord2d
     if (!t.backward(x,y,z)) {
         std::ostringstream s;
         s << "Failed to back project "
-          << "from " <<  t.dest().params() << " to: " << t.source().params();
+         << t.definition();
         throw std::runtime_error(s.str());
     }
     return mapnik::coord2d(x,y);
@@ -88,7 +88,7 @@ mapnik::box2d<double> forward_transform_env(mapnik::proj_transform& t, mapnik::b
     if (!t.forward(new_box)) {
         std::ostringstream s;
         s << "Failed to forward project "
-          << "from " << t.source().params() << " to: " << t.dest().params();
+          << t.definition();
         throw std::runtime_error(s.str());
     }
     return new_box;
@@ -100,7 +100,7 @@ mapnik::box2d<double> backward_transform_env(mapnik::proj_transform& t, mapnik::
     if (!t.backward(new_box)){
         std::ostringstream s;
         s << "Failed to back project "
-          << "from " <<  t.dest().params() << " to: " << t.source().params();
+          << t.definition();
         throw std::runtime_error(s.str());
     }
     return new_box;
@@ -112,7 +112,7 @@ mapnik::box2d<double> forward_transform_env_p(mapnik::proj_transform& t, mapnik:
     if (!t.forward(new_box,points)) {
         std::ostringstream s;
         s << "Failed to forward project "
-          << "from " << t.source().params() << " to: " << t.dest().params();
+          << t.definition();
         throw std::runtime_error(s.str());
     }
     return new_box;
@@ -124,7 +124,7 @@ mapnik::box2d<double> backward_transform_env_p(mapnik::proj_transform& t, mapnik
     if (!t.backward(new_box,points)){
         std::ostringstream s;
         s << "Failed to back project "
-          << "from " <<  t.dest().params() << " to: " << t.source().params();
+          <<  t.definition();
         throw std::runtime_error(s.str());
     }
     return new_box;
@@ -136,14 +136,15 @@ void export_proj_transform ()
 {
     using namespace boost::python;
 
-    class_<proj_transform, boost::noncopyable>("ProjTransform", init< projection const&, projection const& >())
+    class_<proj_transform, boost::noncopyable>("ProjTransform", init<projection const&, projection const&>())
         .def_pickle(proj_transform_pickle_suite())
         .def("forward", forward_transform_c)
         .def("backward",backward_transform_c)
         .def("forward", forward_transform_env)
         .def("backward",backward_transform_env)
         .def("forward", forward_transform_env_p)
         .def("backward",backward_transform_env_p)
+        .def("definition",&proj_transform::definition)
         ;
 
 }