#664 enable svg-style transforms to be set via python bindings. eg sym.transform = 'scale(0.4, 1.0) rotate(0.3)'

bindings/python/mapnik_line_pattern_symbolizer.cpp

@@ -26,6 +26,7 @@
 #include <mapnik/line_pattern_symbolizer.hpp>
 #include <mapnik/parse_path.hpp>
 #include <mapnik/image_util.hpp>
+#include "mapnik_svg.hpp"
 
 using mapnik::line_pattern_symbolizer;
 using mapnik::path_processor_type;
@@ -52,5 +53,8 @@ void export_line_pattern_symbolizer()
                                     init<path_expression_ptr>
                                     ("<image file expression>"))
         //.def_pickle(line_pattern_symbolizer_pickle_suite())
+        .add_property("transform",
+              mapnik::get_svg_transform<line_pattern_symbolizer>,
+              mapnik::set_svg_transform<line_pattern_symbolizer>)
         ;    
 }

bindings/python/mapnik_markers_symbolizer.cpp

@@ -26,6 +26,7 @@
 #include <mapnik/image_util.hpp>
 #include <mapnik/markers_symbolizer.hpp>
 #include <mapnik/parse_path.hpp>
+#include "mapnik_svg.hpp"
 
 using mapnik::markers_symbolizer;
 using mapnik::symbolizer_with_image;
@@ -107,5 +108,8 @@ void export_markers_symbolizer()
                       &markers_symbolizer::get_opacity,
                       &markers_symbolizer::set_opacity,
                       "Set/get the text opacity")
+        .add_property("transform",
+                      mapnik::get_svg_transform<markers_symbolizer>,
+                      mapnik::set_svg_transform<markers_symbolizer>)
         ;
 }

bindings/python/mapnik_point_symbolizer.cpp

@@ -26,6 +26,7 @@
 #include <mapnik/image_util.hpp>
 #include <mapnik/point_symbolizer.hpp>
 #include <mapnik/parse_path.hpp>
+#include "mapnik_svg.hpp"
 
 using mapnik::point_symbolizer;
 using mapnik::symbolizer_with_image;
@@ -70,6 +71,7 @@ struct point_symbolizer_pickle_suite : boost::python::pickle_suite
 namespace  
 { 
 using namespace boost::python;
+
 const std::string get_filename(mapnik::point_symbolizer& symbolizer) 
 { 
     return path_processor_type::to_string(*symbolizer.get_filename()); 
@@ -99,5 +101,8 @@ void export_point_symbolizer()
         .add_property("ignore_placement",
                       &point_symbolizer::get_ignore_placement,
                       &point_symbolizer::set_ignore_placement)
+        .add_property("transform",
+                      mapnik::get_svg_transform<point_symbolizer>,
+                      mapnik::set_svg_transform<point_symbolizer>)
         ;
 }

bindings/python/mapnik_polygon_pattern_symbolizer.cpp

@@ -26,6 +26,7 @@
 #include <mapnik/polygon_pattern_symbolizer.hpp>
 #include "mapnik_enumeration.hpp"
 #include <mapnik/parse_path.hpp>
+#include "mapnik_svg.hpp"
 
 using namespace mapnik;
 using mapnik::polygon_pattern_symbolizer;
@@ -82,6 +83,8 @@ void export_polygon_pattern_symbolizer()
               &polygon_pattern_symbolizer::get_alignment,
               &polygon_pattern_symbolizer::set_alignment,
               "Set/get the alignment of the pattern")
-
+        .add_property("transform",
+              mapnik::get_svg_transform<polygon_pattern_symbolizer>,
+              mapnik::set_svg_transform<polygon_pattern_symbolizer>)
         ;    
 }

bindings/python/mapnik_shield_symbolizer.cpp

@@ -26,6 +26,7 @@
 #include <mapnik/shield_symbolizer.hpp>
 #include <mapnik/image_util.hpp>
 #include <mapnik/path_expression_grammar.hpp>
+#include "mapnik_svg.hpp"
 
 using mapnik::color;
 using mapnik::shield_symbolizer;
@@ -218,9 +219,9 @@ void export_shield_symbolizer()
         .add_property("filename",
                       get_filename,
                       &shield_symbolizer::set_filename)
-        //.add_property("transform",
-        //              &shield_symbolizer::get_transform,
-        //              &shield_symbolizer::set_transform)
+        .add_property("transform",
+                      mapnik::get_svg_transform<shield_symbolizer>,
+                      mapnik::set_svg_transform<shield_symbolizer>)
 
         ;
 

bindings/python/mapnik_svg.hpp

@@ -0,0 +1,53 @@
+/*****************************************************************************
+ * 
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2010 Robert Coup
+ *
+ * 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_PYTHON_BINDING_SVG_INCLUDED
+#define MAPNIK_PYTHON_BINDING_SVG_INCLUDED
+
+#include <mapnik/symbolizer.hpp>
+#include <mapnik/svg/svg_path_parser.hpp>
+#include <boost/format.hpp>
+#include "agg_trans_affine.h"
+
+namespace mapnik {
+using namespace boost::python;
+
+template <class T>
+const std::string get_svg_transform(T& symbolizer)
+{
+    mapnik::transform_type matrix = symbolizer.get_transform();
+    std::string s = (boost::format("matrix(%f, %f, %f, %f, %f, %f)") % matrix[0] % matrix[1] % matrix[2] % matrix[3] % matrix[4] % matrix[5]).str();
+    return s;
+};
+
+template <class T>
+void set_svg_transform(T& symbolizer, std::string const& transform_wkt)
+{
+    agg::trans_affine tr;
+    mapnik::svg::parse_transform(transform_wkt, tr);
+    mapnik::transform_type matrix;
+    tr.store_to(&matrix[0]);
+    symbolizer.set_transform(matrix);
+};
+
+} // end of namespace mapnik
+
+#endif // MAPNIK_PYTHON_BINDING_SVG_INCLUDED