From 9af87ba8db9458a0dbe25978e3e23e774b619fe5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carlos=20L=C3=B3pez?= <ccaarlooss@gmail.com>
Date: Fri, 30 Jul 2010 18:40:41 +0000
Subject: [PATCH] SVG generator outputs path vertices in user coordinates.

---
 .../mapnik/svg/svg_generator_path_grammar.hpp | 72 ++++++++++++++++++-
 src/SConscript                                |  2 +-
 2 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/include/mapnik/svg/svg_generator_path_grammar.hpp b/include/mapnik/svg/svg_generator_path_grammar.hpp
index 343b0060c..0646e970c 100644
--- a/include/mapnik/svg/svg_generator_path_grammar.hpp
+++ b/include/mapnik/svg/svg_generator_path_grammar.hpp
@@ -29,14 +29,18 @@
 #include <mapnik/ctrans.hpp>
 
 // boost
-#include <boost/fusion/include/adapt_class.hpp>
 #include <boost/spirit/include/karma.hpp>
+#include <boost/fusion/include/adapt_class.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>
+#include <boost/spirit/home/phoenix/bind/bind_member_function.hpp>
 
 BOOST_FUSION_ADAPT_CLASS(
     mapnik::vertex_vector2<mapnik::vertex2d>::vertex_type,
     (unsigned, unsigned, obj.get<2>(), /**/)
     (mapnik::vertex_vector2<mapnik::vertex2d>::value_type, mapnik::vertex_vector2<mapnik::vertex2d>::value_type, obj.get<0>(), /**/)
     (mapnik::vertex_vector2<mapnik::vertex2d>::value_type, mapnik::vertex_vector2<mapnik::vertex2d>::value_type, obj.get<1>(), /**/)
+    (mapnik::vertex_vector2<mapnik::vertex2d>::value_type, mapnik::vertex_vector2<mapnik::vertex2d>::value_type, obj.get<0>(), /**/)
+    (mapnik::vertex_vector2<mapnik::vertex2d>::value_type, mapnik::vertex_vector2<mapnik::vertex2d>::value_type, obj.get<1>(), /**/)
 )
 
 namespace boost { namespace spirit { namespace traits {
@@ -76,20 +80,82 @@ namespace boost { namespace spirit { namespace traits {
 namespace mapnik { namespace svg {
 
     using namespace boost::spirit;
+    using namespace boost::phoenix;
+
+    template <typename PathType>
+    struct path_coordinate_transformer
+    {
+	explicit path_coordinate_transformer(PathType const& path_type)
+	    : path_type_(path_type),
+	      current_x_(0.0),
+	      current_y_(0.0)
+	{}
+
+	void set_current_x(double& x)
+	{
+	    current_x_ = x;
+	}
+
+	void set_current_y(double& y)
+	{
+	    current_y_ = y;
+	    path_type_.vertex(&current_x_, &current_y_);
+	}
+
+	void current_x(double& x) const
+	{
+	    x = current_x_;
+	}
+
+	void current_y(double& y) const
+	{
+	    y = current_y_;
+	}
+
+	PathType const& path_type_;
+	double current_x_;
+	double current_y_;	
+    };
 
     template <typename OutputIterator, typename PathType>
     struct svg_generator_path_grammar : karma::grammar<OutputIterator, mapnik::geometry2d()>
     {
+	typedef path_coordinate_transformer<PathType> coordinate_transformer;
+	typedef mapnik::vertex_vector2<mapnik::vertex2d>::vertex_type vertex_type;
+	typedef mapnik::vertex_vector2<mapnik::vertex2d>::value_type vertex_component_type;
+
 	explicit svg_generator_path_grammar(PathType const& path_type)
 	    : svg_generator_path_grammar::base_type(svg_path),
-	      path_type_(path_type)
+	      path_type_(path_type),
+	      ct_(path_type)
 	{
-	    svg_path = *(karma::int_ << karma::lit(' ') <<  karma::double_ << karma::lit(' ') << karma::double_ << karma::eol);
+	    using karma::int_;
+	    using karma::double_;
+	    using karma::eol;
+	    using karma::omit;
+	    using karma::_1;
+	    using karma::_a;
+
+	    svg_path = *(path_vertex);
+	    path_vertex = int_ 
+		<< omit[path_vertex_component_x] << omit[path_vertex_component_y]
+		<< path_vertex_transformed_x
+		<< ' '
+		<< path_vertex_transformed_y
+		<< eol;
+	    path_vertex_component_x = double_[_1 = _a][bind(&coordinate_transformer::set_current_x, &ct_, _a)][_a = _val];
+	    path_vertex_component_y = double_[_1 = _a][bind(&coordinate_transformer::set_current_y, &ct_, _a)][_a = _val];
+	    path_vertex_transformed_x = double_[_1 = _a][bind(&coordinate_transformer::current_x, &ct_, _a)];
+	    path_vertex_transformed_y = double_[_1 = _a][bind(&coordinate_transformer::current_y, &ct_, _a)];
 	}
 
 	karma::rule<OutputIterator, mapnik::geometry2d()> svg_path;
+	karma::rule<OutputIterator, vertex_type()> path_vertex;
+	karma::rule<OutputIterator, vertex_component_type(), karma::locals<double> > path_vertex_component_x, path_vertex_component_y;
+	karma::rule<OutputIterator, vertex_component_type(), karma::locals<double> > path_vertex_transformed_x, path_vertex_transformed_y;
 
 	PathType const& path_type_;
+	coordinate_transformer ct_;
     };
 }}
 
diff --git a/src/SConscript b/src/SConscript
index 57277163d..32b5d4617 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -190,6 +190,7 @@ if env['SVG_RENDERER']: # svg backend
     source += Split(
         """
 	svg/svg_renderer.cpp
+	svg/svg_generator.cpp	
 	svg/process_building_symbolizer.cpp
 	svg/process_glyph_symbolizer.cpp
 	svg/process_line_pattern_symbolizer.cpp
@@ -201,7 +202,6 @@ if env['SVG_RENDERER']: # svg backend
 	svg/process_raster_symbolizer.cpp
 	svg/process_shield_symbolizer.cpp
 	svg/process_text_symbolizer.cpp	
-	svg/svg_generator.cpp	
 	""")
 
 mapnik = env.SharedLibrary('mapnik2', source, LIBS=libraries, LINKFLAGS=linkflags)