+ remove debug print

(FIXME: output proper geometry types - don't shortcut to Multi***)

SConstruct

@@ -102,6 +102,7 @@ PLUGINS = { # plugins with external dependencies
             'shape':   {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
             'csv':     {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
             'raster':  {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
+            'geojson': {'default':True,'path':None,'inc':None,'lib':None,'lang':'C++'},
             'kismet':  {'default':False,'path':None,'inc':None,'lib':None,'lang':'C++'},
             }
 

bindings/python/mapnik_map.cpp

@@ -150,16 +150,17 @@ bool has_metawriter(mapnik::Map const& m)
 
 // returns empty shared_ptr when the metawriter isn't found, or is
 // of the wrong type. empty pointers make it back to Python as a None.
-mapnik::metawriter_inmem_ptr find_inmem_metawriter(const mapnik::Map & m, std::string const& name) {
-    mapnik::metawriter_ptr metawriter = m.find_metawriter(name);
-    mapnik::metawriter_inmem_ptr inmem;
 
-    if (metawriter) {
+//mapnik::metawriter_inmem_ptr find_inmem_metawriter(const mapnik::Map & m, std::string const& name) {
-        inmem = boost::dynamic_pointer_cast<mapnik::metawriter_inmem>(metawriter);
+//    mapnik::metawriter_ptr metawriter = m.find_metawriter(name);
-    }
+///   mapnik::metawriter_inmem_ptr inmem;
 
-    return inmem;
+//    if (metawriter) {
-}
+//        inmem = boost::dynamic_pointer_cast<mapnik::metawriter_inmem>(metawriter);
+//    }
+//
+//    return inmem;
+//}
 
 // TODO - we likely should allow indexing by negative number from python
 // for now, protect against negative values and kindly throw
@@ -482,13 +483,14 @@ void export_map()
              "\n"
              "Use a path like \"[z]/[x]/[y].json\" to create filenames.\n"
             )
-        .def("find_inmem_metawriter", find_inmem_metawriter,
+
-             (arg("name")),
+//        .def("find_inmem_metawriter", find_inmem_metawriter,
-             "Gets an inmem metawriter, or None if no such metawriter "
+        //            (arg("name")),
-             "exists.\n"
+        //    "Gets an inmem metawriter, or None if no such metawriter "
-             "Use this after the map has been rendered to retrieve information "
+        //    "exists.\n"
-             "about the hit areas rendered on the map.\n"
+        //    "Use this after the map has been rendered to retrieve information "
-            )
+        //    "about the hit areas rendered on the map.\n"
+        //   )
 
         .def("__deepcopy__",&map_deepcopy)
         .add_property("parameters",make_function(params_nonconst,return_value_policy<reference_existing_object>()),"TODO")

demo/viewer/mainwindow.cpp

@@ -39,6 +39,12 @@
 #include <mapnik/config_error.hpp>
 #include <mapnik/load_map.hpp>
 #include <mapnik/save_map.hpp>
+#include <mapnik/metawriter_renderer.hpp>
+#ifdef HAVE_CAIRO
+// cairo
+#include <mapnik/cairo_renderer.hpp>
+#include <cairomm/surface.h>
+#endif
 #endif
 
 // qt
@@ -49,6 +55,8 @@
 #include "layerdelegate.hpp"
 #include "about_dialog.hpp"
 
+
+
 MainWindow::MainWindow()
     : filename_(),
       default_extent_(-20037508.3428,-20037508.3428,20037508.3428,20037508.3428)
@@ -256,6 +264,56 @@ void MainWindow::export_as()
     }
 }
 
+void MainWindow::export_as_pdf()
+{
+    QAction *action = qobject_cast<QAction *>(sender());
+    QString initialPath = QDir::currentPath() + "/mapnik-cairo.pdf";
+
+    QString fileName = QFileDialog::getSaveFileName(this, tr("Export As PDF"),
+                                                    initialPath,
+                                                    tr("%1 Files (*.%2);;All Files (*)")
+                                                    .arg(QString("PDF"))
+                                                    .arg(QString("pdf")));
+    if (!fileName.isEmpty())
+    {
+        std::cout << "FILE NAME:" << fileName.toStdString() << std::endl;
+#ifdef HAVE_CAIRO
+        boost::shared_ptr<mapnik::Map> map_ptr = mapWidget_->getMap();
+        if (map_ptr)
+        {
+            Cairo::RefPtr<Cairo::Surface> surface;
+            surface = Cairo::PdfSurface::create(fileName.toStdString().c_str(), map_ptr->width(),map_ptr->height());
+            mapnik::cairo_renderer<Cairo::Surface> pdf_render(*map_ptr, surface);
+            pdf_render.apply();
+        }
+#endif
+    }
+}
+
+void MainWindow::export_as_meta()
+{
+    QAction *action = qobject_cast<QAction *>(sender());
+    QString initialPath = QDir::currentPath() + "/mapnik-meta.json";
+
+    QString fileName = QFileDialog::getSaveFileName(this, tr("Export As Meta JSON"),
+                                                    initialPath,
+                                                    tr("%1 Files (*.%2);;All Files (*)")
+                                                    .arg(QString("META"))
+                                                    .arg(QString("json")));
+    if (!fileName.isEmpty())
+    {
+        std::cout << "FILE NAME:" << fileName.toStdString() << std::endl;
+#ifdef HAVE_CAIRO
+        boost::shared_ptr<mapnik::Map> map_ptr = mapWidget_->getMap();
+        if (map_ptr)
+        {
+            mapnik::metawriter_renderer ren(*map_ptr);
+            ren.apply();
+        }
+#endif
+    }
+}
+
 void MainWindow::print()
 {
 
@@ -328,6 +386,14 @@ void MainWindow::createActions()
         exportAsActs.append(action);
     }
 
+    // export PDF
+    exportPdfAction = new QAction(QString("PDF (cairo)"), this);
+    connect(exportPdfAction, SIGNAL(triggered()), this, SLOT(export_as_pdf()));
+    
+    // export META Json
+    exportMetaAction = new QAction(QString("META (json)"), this);
+    connect(exportMetaAction, SIGNAL(triggered()), this, SLOT(export_as_meta()));
+
     printAct = new QAction(QIcon(":/images/print.png"),tr("&Print ..."),this);
     printAct->setShortcut(tr("Ctrl+E"));
     connect(printAct, SIGNAL(triggered()), this, SLOT(print()));
@@ -349,6 +415,8 @@ void MainWindow::createMenus()
     fileMenu = new QMenu(tr("&File"),this);
     fileMenu->addAction(openAct);
     fileMenu->addAction(saveAct);
+    fileMenu->addAction(exportPdfAction);
+    fileMenu->addAction(exportMetaAction);
     fileMenu->addMenu(exportMenu);
     fileMenu->addAction(printAct);
     fileMenu->addSeparator();

demo/viewer/mainwindow.hpp

@@ -54,6 +54,8 @@ public slots:
     void pan();
     void info();
     void export_as();
+    void export_as_pdf();
+    void export_as_meta();
     void open(QString const&  path = QString());
     void reload();
     void save();
@@ -88,6 +90,8 @@ private:
     QAction *infoAct;
     QAction *openAct;
     QAction *saveAct;
+    QAction *exportPdfAction;
+    QAction *exportMetaAction;
     QAction *printAct;
     QAction *exitAct;
     QAction *aboutAct;

include/mapnik/json/feature_collection_grammar.hpp

@@ -87,7 +87,7 @@ struct feature_collection_grammar :
         features = lit("\"features\"")
             > lit(":")
             > lit('[')
-            > feature(_val) % lit(',')
+            > -(feature(_val) % lit(','))
             > lit(']')
             ;
         

include/mapnik/json/feature_grammar.hpp

@@ -162,7 +162,7 @@ struct feature_grammar :
         using qi::_pass;
         using qi::eps;
         using qi::raw;
-        
+
         using phoenix::new_;
         using phoenix::push_back;
         using phoenix::construct;
@@ -197,7 +197,7 @@ struct feature_grammar :
         unesc_char.add
             ("\\\"", '\"') // quotation mark
             ("\\\\", '\\') // reverse solidus
-            ("\\/", '/')   // solidus            
+            ("\\/", '/')   // solidus
             ("\\b", '\b')  // backspace
             ("\\f", '\f')  // formfeed
             ("\\n", '\n')  // newline
@@ -207,7 +207,7 @@ struct feature_grammar :
 
         string_ %= lit('"') >> *(unesc_char | "\\u" >> hex4 | (char_ - lit('"'))) >> lit('"')
             ;
-        
+
         // geojson types
 
         feature_type = lit("\"type\"")
@@ -244,17 +244,17 @@ struct feature_grammar :
         //    ;
         //////////////////////////////////////////////////////////////////
 
-        geometry = (lit('{')[_a = 0 ] 
+        geometry = (lit('{')[_a = 0 ]
                     >> lit("\"type\"") >> lit(':') >> geometry_dispatch[_a = _1] // <---- should be Nabialek trick!
-                    >> lit(',') 
+                    >> lit(',')
                     >> (lit("\"coordinates\"") > lit(':') > coordinates(_r1,_a)
-                        | 
+                        |
-                        lit("\"geometries\"") > lit(':') 
+                        lit("\"geometries\"") > lit(':')
                         >> lit('[') >> geometry_collection(_r1) >> lit(']'))
                     >> lit('}'))
             | lit("null")
             ;
-                
+
         geometry_dispatch.add
             ("\"Point\"",1)
             ("\"LineString\"",2)
@@ -265,7 +265,7 @@ struct feature_grammar :
             ("\"GeometryCollection\"",7)
             //
             ;
-        
+
         coordinates = (eps(_r2 == 1) > point_coordinates(extract_geometry_(_r1)))
             | (eps(_r2 == 2) > linestring_coordinates(extract_geometry_(_r1)))
             | (eps(_r2 == 3) > polygon_coordinates(extract_geometry_(_r1)))
@@ -273,46 +273,45 @@ struct feature_grammar :
             | (eps(_r2 == 5) > multilinestring_coordinates(extract_geometry_(_r1)))
             | (eps(_r2 == 6) > multipolygon_coordinates(extract_geometry_(_r1)))
             ;
-        
+
         point_coordinates =  eps[ _a = new_<geometry_type>(Point) ]
             > ( point(SEG_MOVETO,_a) [push_back(_r1,_a)] | eps[cleanup_(_a)][_pass = false] )
             ;
 
         linestring_coordinates = eps[ _a = new_<geometry_type>(LineString)]
-            > (points(_a) [push_back(_r1,_a)]
+            > -(points(_a) [push_back(_r1,_a)]
                | eps[cleanup_(_a)][_pass = false])
             ;
 
         polygon_coordinates = eps[ _a = new_<geometry_type>(Polygon) ]
             > ((lit('[')
-                > points(_a) % lit(',')
+                > -(points(_a) % lit(','))
                 > lit(']')) [push_back(_r1,_a)]
                | eps[cleanup_(_a)][_pass = false])
             ;
-        
+
-        multipoint_coordinates =  lit('[') 
+        multipoint_coordinates =  lit('[')
-            > (point_coordinates(_r1) % lit(',')) 
+            > -(point_coordinates(_r1) % lit(','))
             > lit(']')
             ;
-        
+
-        multilinestring_coordinates =  lit('[') 
+        multilinestring_coordinates =  lit('[')
-            > (linestring_coordinates(_r1) % lit(','))
+            > -(linestring_coordinates(_r1) % lit(','))
             > lit(']')
             ;
-        
+
-        multipolygon_coordinates =  lit('[') 
+        multipolygon_coordinates =  lit('[')
-            > (polygon_coordinates(_r1) % lit(','))
+            > -(polygon_coordinates(_r1) % lit(','))
             > lit(']')
             ;
 
         geometry_collection = *geometry(_r1) >> *(lit(',') >> geometry(_r1))
             ;
-        
-        // point
-        point = (lit('[') > double_ > lit(',') > double_ > lit(']')) [push_vertex_(_r1,_r2,_1,_2)];
-        // points
-        points = lit('[')[_a = SEG_MOVETO] > point (_a,_r1) % lit(',') [_a = SEG_LINETO] > lit(']');
 
+        // point
+        point = lit('[') > -((double_ > lit(',') > double_)[push_vertex_(_r1,_r2,_1,_2)]) > lit(']');
+        // points
+        points = lit('[')[_a = SEG_MOVETO] > -(point (_a,_r1) % lit(',')[_a = SEG_LINETO]) > lit(']');
         on_error<fail>
             (
                 feature
@@ -362,7 +361,7 @@ struct feature_grammar :
     qi::rule<Iterator,qi::locals<geometry_type*>,
              void(boost::ptr_vector<mapnik::geometry_type>& ),space_type> linestring_coordinates;
     qi::rule<Iterator,qi::locals<geometry_type*>,
-             void(boost::ptr_vector<mapnik::geometry_type>& ),space_type> polygon_coordinates;    
+             void(boost::ptr_vector<mapnik::geometry_type>& ),space_type> polygon_coordinates;
 
     qi::rule<Iterator,void(boost::ptr_vector<mapnik::geometry_type>& ),space_type> multipoint_coordinates;
     qi::rule<Iterator,void(boost::ptr_vector<mapnik::geometry_type>& ),space_type> multilinestring_coordinates;

include/mapnik/map.hpp

@@ -28,7 +28,7 @@
 #include <mapnik/feature_type_style.hpp>
 #include <mapnik/datasource.hpp>
 #include <mapnik/layer.hpp>
-#include <mapnik/metawriter.hpp>
+#include <mapnik/metawriter_factory.hpp>
 #include <mapnik/params.hpp>
 
 // boost
@@ -72,7 +72,7 @@ private:
     boost::optional<color> background_;
     boost::optional<std::string> background_image_;
     std::map<std::string,feature_type_style> styles_;
-    std::map<std::string,metawriter_ptr> metawriters_;
+    std::map<std::string,metawriter> metawriters_;
     std::map<std::string,font_set> fontsets_;
     std::vector<layer> layers_;
     aspect_fix_mode aspectFixMode_;
@@ -87,7 +87,7 @@ public:
     typedef std::map<std::string,feature_type_style>::iterator style_iterator;
     typedef std::map<std::string,font_set>::const_iterator const_fontset_iterator;
     typedef std::map<std::string,font_set>::iterator fontset_iterator;
-    typedef std::map<std::string,metawriter_ptr>::const_iterator const_metawriter_iterator;
+    typedef std::map<std::string,metawriter>::const_iterator const_metawriter_iterator;
 
     /*! \brief Default constructor.
      *
@@ -173,7 +173,7 @@ public:
      *  @return true If success.
      *  @return false If no success.
      */
-    bool insert_metawriter(std::string const& name, metawriter_ptr const& writer);
+    bool insert_metawriter(std::string const& name, metawriter const& writer);
 
     /*! \brief Remove a metawriter from the map.
      *  @param name The name of the writer.
@@ -184,12 +184,12 @@ public:
      *  @param name The name of the writer.
      *  @return The writer if found. If not found return 0.
      */
-    metawriter_ptr find_metawriter(std::string const& name) const;
+    metawriter find_metawriter(std::string const& name) const;
 
     /*! \brief Get all metawriters.
      *  @return Const reference to metawriters.
      */
-    std::map<std::string,metawriter_ptr> const& metawriters() const;
+    std::map<std::string,metawriter> const& metawriters() const;
 
     /*! \brief Get first iterator in metawriters.
      *  @return Constant metawriter iterator.

include/mapnik/metawriter.hpp

@@ -27,13 +27,12 @@
 #include <mapnik/feature.hpp>
 #include <mapnik/ctrans.hpp>
 #include <mapnik/projection.hpp>
-
 // boost
 #include <boost/utility.hpp>
 #include <boost/shared_ptr.hpp>
 #include <boost/optional.hpp>
 #include <boost/concept_check.hpp>
-
+#include <boost/variant.hpp>
 // stl
 #include <set>
 #include <string>
@@ -79,7 +78,7 @@ private:
 };
 
 
-/** All properties to be output by a metawriter. */
+// All properties to be output by a metawriter.
 class metawriter_properties : public std::set<std::string>
 {
 public:
@@ -90,76 +89,23 @@ public:
     std::string to_string() const;
 };
 
-/** Abstract baseclass for all metawriter classes. */
+// Abstract baseclass for all metawriter classes.
-class metawriter
+class metawriter_base
 {
-public:
+public:    
-    typedef coord_transform<CoordTransform,geometry_type> path_type;
+    explicit metawriter_base(metawriter_properties dflt_properties) :
-    metawriter(metawriter_properties dflt_properties) :
         dflt_properties_(dflt_properties),
         width_(0),
         height_(0) {}
-    virtual ~metawriter() {}
+    
-    /** Output a rectangular area.
+    void set_size(int width, int height) { width_ = width; height_ = height; }    
-     * \param box Area (in pixel coordinates)
-     * \param feature The feature being processed
-     * \param prj_trans Projection transformation
-     * \param t Coordinate transformation
-     * \param properties List of properties to output
-     */
-    virtual void add_box(box2d<double> const& box, Feature const& feature,
-                         CoordTransform const& t,
-                         metawriter_properties const& properties)=0;
-    virtual void add_text(boost::ptr_vector<text_path> &placements,
-                          box2d<double> const& extents,
-                          Feature const& feature,
-                          CoordTransform const& t,
-                          metawriter_properties const& properties)=0;
-    virtual void add_polygon(path_type & path,
-                             Feature const& feature,
-                             CoordTransform const& t,
-                             metawriter_properties const& properties)=0;
-    virtual void add_line(path_type & path,
-                          Feature const& feature,
-                          CoordTransform const& t,
-                          metawriter_properties const& properties)=0;
-
-    /** Start processing.
-     * Write file header, init database connection, ...
-     *
-     * \param properties metawriter_property_map object with userdefined values.
-     *        Useful for setting filename etc.
-     */
-    virtual void start(metawriter_property_map const& properties)
-    {
-        boost::ignore_unused_variable_warning(properties);
-    }
-
-    /** Stop processing.
-     * Write file footer, close database connection, ...
-     */
-    virtual void stop() {}
-    /** Set output size (pixels).
-     * All features that are completely outside this size are discarded.
-     */
-    void set_size(int width, int height) { width_ = width; height_ = height; }
-    /** Set Map object's srs. */
-    virtual void set_map_srs(projection const& proj) { /* Not required when working with image coordinates. */ }
-    /** Return the list of default properties. */
     metawriter_properties const& get_default_properties() const { return dflt_properties_;}
 protected:
     metawriter_properties dflt_properties_;
-    /** Output width (pixels). */
     int width_;
-    /** Output height (pixels). */
     int height_;
 };
 
-/** Shared pointer to metawriter object. */
-typedef boost::shared_ptr<metawriter> metawriter_ptr;
-/** Metawriter object + properties. */
-typedef std::pair<metawriter_ptr, metawriter_properties> metawriter_with_properties;
-
 }
 
 #endif // MAPNIK_METAWRITER_HPP

include/mapnik/metawriter_factory.hpp

@@ -25,28 +25,198 @@
 
 // mapnik
 #include <mapnik/metawriter.hpp>
-
+#include <mapnik/metawriter_json.hpp>
+#include <mapnik/metawriter_inmem.hpp>
 // boost
 #include <boost/property_tree/ptree.hpp>
 
 namespace mapnik {
+
+
 class xml_node;
 
+struct is_valid : boost::static_visitor<bool>
+{
+    template <typename T>
+    bool operator() (T const& writer_ptr) const
+    {
+        return (writer_ptr.get()!=0) ? true : false;
+    }
+};
+
+struct add_box_ : boost::static_visitor<>
+{
+    add_box_(box2d<double> const& box, Feature const& feature,
+            CoordTransform const& t,
+            metawriter_properties const& properties)
+        : box_(box),
+          feature_(feature),
+          t_(t),
+          properties_(properties)
+    {}
+    
+    template <typename T>
+    void operator() (T const& writer_ptr) const
+    {
+        return writer_ptr->add_box(box_,feature_,t_, properties_);
+    }
+    
+    box2d<double> const& box_;
+    Feature const& feature_;
+    CoordTransform const& t_;
+    metawriter_properties const& properties_;
+};
+
+
+template <typename T>
+struct add_line_ : boost::static_visitor<>
+{
+    typedef T path_type;
+    
+    add_line_(path_type & path, Feature const& feature,
+            CoordTransform const& t,
+            metawriter_properties const& properties)
+        : path_(path),
+          feature_(feature),
+          t_(t),
+          properties_(properties)
+    {}
+    
+    template <typename U>
+    void operator() (U const& writer_ptr) const
+    {
+        return writer_ptr->add_line(path_,feature_,t_, properties_);
+    }
+    
+    path_type & path_;
+    Feature const& feature_;
+    CoordTransform const& t_;
+    metawriter_properties const& properties_;
+};
+
+
+struct start_ : boost::static_visitor<>
+{    
+    start_(metawriter_property_map const& properties)
+        : properties_(properties) {}
+    
+    template <typename U>
+    void operator() (U const& writer_ptr) const
+    {
+        std::cout << typeid(*writer_ptr).name() << std::endl;
+        return writer_ptr->start(properties_);
+    }
+    metawriter_property_map const& properties_;
+};
+
+struct set_size_ : boost::static_visitor<>
+{    
+    set_size_(unsigned w, unsigned h)
+        : w_(w), h_(h) {}
+    
+    template <typename U>
+    void operator() (U const& writer_ptr) const
+    {
+        return writer_ptr->set_size(w_,h_);
+    }
+    
+    unsigned w_;
+    unsigned h_;
+};
+
+
+struct set_map_srs_ : boost::static_visitor<>
+{    
+    set_map_srs_(projection const& proj)
+       : proj_(proj) {}
+    
+    template <typename U>
+    void operator() (U const& writer_ptr) const
+    {
+        return writer_ptr->set_map_srs(proj_);
+    }
+    
+    projection const& proj_;
+};
+
+struct stop_ : boost::static_visitor<>
+{    
+    template <typename U>
+    void operator() (U const& writer_ptr) const
+    {
+        return writer_ptr->stop();
+    }
+};
+
+
+typedef boost::variant<metawriter_json_ptr, metawriter_inmem_ptr> metawriter;
+
+inline bool check_metawriter(metawriter const& m)
+{        
+    return boost::apply_visitor(is_valid(), m);
+}
+
+
+inline void add_box(metawriter const& m,
+                    box2d<double> const& box, Feature const& feature,
+                    CoordTransform const& t,
+                    metawriter_properties const& properties)
+{
+    add_box_ v(box,feature,t,properties);
+    boost::apply_visitor(v, m);
+}
+
+template <typename T>
+void add_line(metawriter const& m, 
+              T & path, 
+              Feature const& feature,
+              CoordTransform const& t,
+              metawriter_properties const& properties)
+{
+    add_line_<T> v(path,feature,t,properties);
+    boost::apply_visitor(v, m);
+}
+
+inline void start(metawriter const& m, metawriter_property_map const& properties )
+{
+    start_ v(properties);
+    boost::apply_visitor(v, m);
+}
+
+inline void stop(metawriter const& m)
+{
+    boost::apply_visitor(stop_(), m);
+}
+
+inline void set_size(metawriter const& m, unsigned w, unsigned h)
+{
+    set_size_ v(w,h);
+    boost::apply_visitor(v, m);    
+}
+
+inline void set_map_srs(metawriter const& m, projection const& proj)
+{
+    set_map_srs_ v(proj);
+    boost::apply_visitor(v, m);
+}
+
+typedef std::pair<metawriter, metawriter_properties> metawriter_with_properties;
+
 /**
  * Creates a metawriter with the properties specified in the property
  * tree argument. Currently, this is hard-coded to the JSON and inmem
  * metawriters, but should provide an easy point to make them a
  * proper factory method if this is wanted in the future.
  */
-metawriter_ptr metawriter_create(xml_node const& pt);
+metawriter metawriter_create(xml_node const& pt);
 
 /**
  * Writes properties into the given property tree representing the
  * metawriter argument, and which can be used to reconstruct it.
  */
 void metawriter_save(
-    const metawriter_ptr &m,
+    metawriter const& m,
-    boost::property_tree::ptree &pt,
+    boost::property_tree::ptree & pt,
     bool explicit_defaults);
 
 }

include/mapnik/metawriter_inmem.hpp

@@ -32,6 +32,8 @@
 
 // stl
 #include <list>
+#include <map>
+#include <string>
 
 namespace mapnik {
 
@@ -50,37 +52,76 @@ namespace mapnik {
  * very common in the rendered image will increase memory usage, especially if
  * many attributes are also kept.
  */
+
+
+namespace {
+
+using mapnik::value;
+using mapnik::Feature;
+using mapnik::metawriter_properties;
+
+// intersect a set of properties with those in the feature descriptor
+std::map<std::string,value> intersect_properties(Feature const& feature, metawriter_properties const& properties) 
+{
+
+    std::map<std::string,value> nprops;
+    BOOST_FOREACH(std::string p, properties)
+    {
+        if (feature.has_key(p))
+            nprops.insert(std::make_pair(p,feature.get(p)));
+    }
+
+    return nprops;
+}} // end anonymous namespace
+
 class MAPNIK_DECL metawriter_inmem
-    : public metawriter, private boost::noncopyable {
+    : public metawriter_base, private boost::noncopyable 
+{
 public:
-    /**
-     * Construct an in-memory writer which keeps properties specified by the
-     * dflt_properties argument. For example: if dflt_properties contains "name",
-     * then the name attribute of rendered features referencing this metawriter
-     * will be kept in memory.
-     */
     metawriter_inmem(metawriter_properties dflt_properties);
     ~metawriter_inmem();
 
-    virtual void add_box(box2d<double> const& box, Feature const& feature,
+    void add_box(box2d<double> const& box, Feature const& feature,
-                         CoordTransform const& t,
+                 CoordTransform const& t,
-                         metawriter_properties const& properties);
+                 metawriter_properties const& properties);
-    virtual void add_text(boost::ptr_vector<text_path> &placements,
+    void add_text(boost::ptr_vector<text_path> &placements,
-                          box2d<double> const& extents,
+             box2d<double> const& extents,
-                          Feature const& feature,
+             Feature const& feature,
-                          CoordTransform const& t,
+             CoordTransform const& t,
-                          metawriter_properties const& properties);
+             metawriter_properties const& properties);
-    virtual void add_polygon(path_type & path,
+    
-                             Feature const& feature,
+    template <typename T>
-                             CoordTransform const& t,
+    void add_polygon(T & path,
-                             metawriter_properties const& properties);
+                     Feature const& feature,
-    virtual void add_line(path_type & path,
+                     CoordTransform const& t,
-                          Feature const& feature,
+                     metawriter_properties const& properties);
-                          CoordTransform const& t,
+    
-                          metawriter_properties const& properties);
+    template <typename T>
-
+    void add_line(T & path,
-    virtual void start(metawriter_property_map const& properties);
+                  Feature const& feature,
-
+                  CoordTransform const& t,
+                  metawriter_properties const& properties)
+    {
+        box2d<double> box;
+        unsigned cmd;
+        double x = 0.0, y = 0.0;
+      
+        path.rewind(0);
+        while ((cmd = path.vertex(&x, &y)) != SEG_END) {
+            box.expand_to_include(x, y);
+        }
+      
+        if ((box.width() >= 0.0) && (box.height() >= 0.0)) {
+            meta_instance inst;
+            inst.properties = intersect_properties(feature, properties);
+            inst.box = box;
+            instances_.push_back(inst);
+        }   
+    }
+    
+    void start(metawriter_property_map const& properties);
+    void stop() {};
+    void set_map_srs(projection const& proj) {}
     /**
      * An instance of a rendered feature. The box represents the image
      * coordinates of a bounding box around the feature. The properties
@@ -105,7 +146,8 @@ private:
 
     std::list<meta_instance> instances_;
 
-    void add_vertices(path_type & path,
+    template <typename T>
+    void add_vertices(T & path,
                       Feature const& feature,
                       CoordTransform const& t,
                       metawriter_properties const& properties);

include/mapnik/metawriter_json.hpp

@@ -35,44 +35,68 @@
 
 namespace mapnik {
 
-
+class metawriter_json_stream : public metawriter_base, 
-/** Write JSON data to a stream object. */
+                               private boost::noncopyable
-class metawriter_json_stream : public metawriter, private boost::noncopyable
 {
 public:
-    metawriter_json_stream(metawriter_properties dflt_properties);
+    explicit metawriter_json_stream(metawriter_properties dflt_properties);
     ~metawriter_json_stream();
-    virtual void add_box(box2d<double> const& box, Feature const& feature,
+    void add_box(box2d<double> const& box, Feature const& feature,
-                         CoordTransform const& t,
+                 CoordTransform const& t,
-                         metawriter_properties const& properties);
+                 metawriter_properties const& properties);
-    virtual void add_text(boost::ptr_vector<text_path> &placements,
+    void add_text(boost::ptr_vector<text_path> &placements,
-                          box2d<double> const& extents,
+                  box2d<double> const& extents,
-                          Feature const& feature,
+                  Feature const& feature,
-                          CoordTransform const& t,
+                  CoordTransform const& t,
-                          metawriter_properties const& properties);
+                  metawriter_properties const& properties);
-    virtual void add_polygon(path_type & path,
+    template <typename T>
-                             Feature const& feature,
+    void add_polygon(T & path,
-                             CoordTransform const& t,
+                     Feature const& feature,
-                             metawriter_properties const& properties);
+                     CoordTransform const& t,
-    virtual void add_line(path_type & path,
+                     metawriter_properties const& properties);   
-                          Feature const& feature,
+    
-                          CoordTransform const& t,
+    template <typename T>
-                          metawriter_properties const& properties);
+    void add_line(T & path,
-
+                  Feature const& feature,
-    virtual void start(metawriter_property_map const& properties);
+                  CoordTransform const& t,
-    virtual void stop();
+                  metawriter_properties const& properties)
-    /** Set output stream. This function has to be called before the first output is made. */
+    {
-    void set_stream(std::ostream *f) { f_ = f; }
+        write_feature_header("MultiLineString");
-    /** Get output stream. */
+        *f_ << " [";
-    std::ostream *get_stream() const { return f_; }
+        
-    /** Only write header/footer to file with one or more features. */
+        path.rewind(0);    
-    void set_output_empty(bool output_empty) { output_empty_ = output_empty; }
+        double x, y;
-    /** See set_output_empty(). */
+        unsigned cmd;        
+        int ring_count = 0;
+        while ((cmd = path.vertex(&x, &y)) != SEG_END) 
+        {
+            if (cmd == SEG_MOVETO) 
+            {
+                if (ring_count++ != 0) *f_ << "], ";
+                *f_ << "[";
+                write_point(t, x, y, true);
+            }
+            else if (cmd == SEG_LINETO) 
+            {            
+                *f_ << ",";
+                write_point(t, x, y, true);
+            }
+        }
+        if (ring_count != 0) *f_ << "]";
+        *f_ << "]";
+            
+        write_properties(feature, properties);
+    }
+    
+    void start(metawriter_property_map const& properties);
+    void stop();    
+    void set_stream(std::ostream *f) { f_ = f; }    
+    std::ostream *get_stream() const { return f_; }    
+    void set_output_empty(bool output_empty) { output_empty_ = output_empty; }    
     bool get_output_empty() { return output_empty_; }
     void set_pixel_coordinates(bool on) { pixel_coordinates_ = on; }
     bool get_pixel_coordinates() { return pixel_coordinates_; }
-    virtual void set_map_srs(projection const& proj);
+    void set_map_srs(projection const& proj);
-
 protected:
     enum {
         HEADER_NOT_WRITTEN = -1,
@@ -87,10 +111,10 @@ protected:
     proj_transform *trans_;
     projection output_srs_;
     bool pixel_coordinates_;
-
+    
-    virtual void write_header();
+    void write_header();
-
+    inline void write_feature_header(std::string type) 
-    inline void write_feature_header(std::string type) {
+    {
         if (count_ == STOPPED)
         {
             MAPNIK_LOG_WARN(metawrite_json) << "Metawriter: instance not started before using it.";
@@ -116,43 +140,32 @@ protected:
             *f_ << ",";
         }
     }
-
+    
-    void write_line_polygon(path_type & path, CoordTransform const& t, bool polygon);
-
 private:
     std::ostream *f_;
 };
 
-/** Shared pointer to metawriter_json_stream object. */
+//typedef boost::shared_ptr<metawriter_json_stream> metawriter_json_stream_ptr;
-typedef boost::shared_ptr<metawriter_json_stream> metawriter_json_stream_ptr;
 
-/** JSON writer. */
+// JSON writer.
 class metawriter_json : public metawriter_json_stream
 {
 public:
     metawriter_json(metawriter_properties dflt_properties, path_expression_ptr fn);
-
+    void start(metawriter_property_map const& properties);
-    virtual void start(metawriter_property_map const& properties);
+    void stop();
-    virtual void stop();
-    /** Set filename template.
-     *
-     * This template is processed with values from Map's metawriter properties to
-     * create the actual filename during start() call.
-     */
     void set_filename(path_expression_ptr fn);
-    /** Get filename template. */
     path_expression_ptr get_filename() const;
-
+    
 private:
     path_expression_ptr fn_;
     std::fstream f_;
     std::string filename_;
 
 protected:
-    virtual void write_header();
+    void write_header();
 };
 
-/** Shared pointer to metawriter_json object. */
 typedef boost::shared_ptr<metawriter_json> metawriter_json_ptr;
 
 }

include/mapnik/metawriter_renderer.hpp

@@ -0,0 +1,83 @@
+/*****************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_METAWRITER_RENDERER_HPP
+#define MAPNIK_METAWRITER_RENDERER_HPP
+
+// mapnik
+#include <mapnik/config.hpp>
+#include <mapnik/feature_style_processor.hpp>
+#include <mapnik/font_engine_freetype.hpp>
+#include <mapnik/label_collision_detector.hpp>
+#include <mapnik/map.hpp>
+
+// boost
+#include <boost/utility.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/optional.hpp>
+
+namespace agg {
+struct trans_affine;
+}
+
+namespace mapnik {
+
+class MAPNIK_DECL metawriter_renderer : public feature_style_processor<metawriter_renderer>,
+                                        private boost::noncopyable
+{
+
+public:
+    typedef metawriter_renderer processor_impl_type;
+    metawriter_renderer(Map const& m, double scale_factor=1.0, unsigned offset_x=0, unsigned offset_y=0);
+    metawriter_renderer(Map const &m, boost::shared_ptr<label_collision_detector4> detector,
+                 double scale_factor=1.0, unsigned offset_x=0, unsigned offset_y=0);
+    ~metawriter_renderer();
+    void start_map_processing(Map const& map);
+    void end_map_processing(Map const& map);
+    void start_layer_processing(layer const& lay, box2d<double> const& query_extent);
+    void end_layer_processing(layer const& lay);
+
+    void start_style_processing(feature_type_style const& st);
+    void end_style_processing(feature_type_style const& st);
+       
+    void process(point_symbolizer const& sym,
+                 mapnik::feature_ptr const& feature,
+                 proj_transform const& prj_trans);    
+    void process(line_symbolizer const& sym,
+                 mapnik::feature_ptr const& feature,
+                 proj_transform const& prj_trans);
+    void painted(bool painted);
+private:
+    unsigned width_;
+    unsigned height_;
+    double scale_factor_;
+    CoordTransform t_;
+    freetype_engine font_engine_;
+    face_manager<freetype_engine> font_manager_;
+    boost::shared_ptr<label_collision_detector4> detector_;
+    box2d<double> query_extent_;
+    void setup(Map const &m);
+};
+}
+
+#endif // MAPNIK_METAWRITER_RENDERER_HPP

include/mapnik/symbolizer.hpp

@@ -26,7 +26,7 @@
 // mapnik
 #include <mapnik/config.hpp>
 #include <mapnik/parse_path.hpp>
-#include <mapnik/metawriter.hpp>
+#include <mapnik/metawriter_factory.hpp>
 #include <mapnik/image_compositing.hpp>
 #include <mapnik/transform_expression.hpp>
 
@@ -52,12 +52,8 @@ public:
     
     /** Add a metawriter to this symbolizer using a name. */
     void add_metawriter(std::string const& name, metawriter_properties const& properties);
-    /** Add a metawriter to this symbolizer using a pointer.
+    
-     * The name is only needed if you intend to call save_map() some time.
+    void add_metawriter(metawriter const& writer,
-     * You don't need to call cache_metawriters() when using this function.
-     * Call this function with an NULL writer_ptr to remove a metawriter.
-     */
-    void add_metawriter(metawriter_ptr writer_ptr,
                         metawriter_properties const& properties = metawriter_properties(),
                         std::string const& name = "");
     /** Cache metawriter objects to avoid repeated lookups while processing.
@@ -96,7 +92,7 @@ private:
     metawriter_properties properties_;
     metawriter_properties properties_complete_;
     std::string writer_name_;
-    metawriter_ptr writer_ptr_;
+    metawriter writer_;
     composite_mode_e comp_op_;
     transform_type affine_transform_;
     bool clip_;

plugins/input/geojson/build.py

@@ -0,0 +1,51 @@
+#
+# This file is part of Mapnik (c++ mapping toolkit)
+#
+# Copyright (C) 2012 Artem Pavlenko
+#
+# Mapnik 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
+#
+
+
+Import ('plugin_base')
+Import ('env')
+
+prefix = env['PREFIX']
+
+plugin_env = plugin_base.Clone()
+
+geojson_src = Split(
+  """
+  geojson_datasource.cpp
+  geojson_featureset.cpp      
+  """
+        )
+
+libraries = []
+# Link Library to Dependencies
+libraries.append('mapnik')
+libraries.append(env['ICU_LIB_NAME'])
+libraries.append('boost_system%s' % env['BOOST_APPEND'])
+if env['THREADING'] == 'multi':
+    libraries.append('boost_thread%s' % env['BOOST_APPEND'])
+
+input_plugin = plugin_env.SharedLibrary('../geojson', source=geojson_src, SHLIBPREFIX='', SHLIBSUFFIX='.input', LIBS=libraries, LINKFLAGS=env['CUSTOM_LDFLAGS'])
+
+# if the plugin links to libmapnik ensure it is built first
+Depends(input_plugin, env.subst('../../../src/%s' % env['MAPNIK_LIB_NAME']))
+
+if 'uninstall' not in COMMAND_LINE_TARGETS:
+    env.Install(env['MAPNIK_INPUT_PLUGINS_DEST'], input_plugin)
+    env.Alias('install', env['MAPNIK_INPUT_PLUGINS_DEST'])

plugins/input/geojson/geojson_datasource.cpp

@@ -0,0 +1,165 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2012 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
+ *
+ *****************************************************************************/
+
+#include "geojson_datasource.hpp"
+#include "geojson_featureset.hpp"
+
+#include <fstream>
+#include <iostream>
+// boost
+#include <boost/make_shared.hpp>
+#include <boost/algorithm/string.hpp>
+#include <boost/spirit/include/support_multi_pass.hpp>
+#include <boost/foreach.hpp>
+#include <boost/geometry/geometries/box.hpp>
+#include <boost/geometry/geometries/geometries.hpp>
+#include <boost/geometry.hpp>
+#include <boost/geometry/extensions/index/rtree/rtree.hpp>
+// mapnik
+#include <mapnik/box2d.hpp>
+#include <mapnik/proj_transform.hpp>
+#include <mapnik/projection.hpp>
+#include <mapnik/json/feature_collection_parser.hpp>
+
+using mapnik::datasource;
+using mapnik::parameters;
+
+DATASOURCE_PLUGIN(geojson_datasource)
+
+geojson_datasource::geojson_datasource(parameters const& params, bool bind)
+: datasource(params),
+    type_(datasource::Vector),
+    desc_(*params_.get<std::string>("type"),
+          *params_.get<std::string>("encoding","utf-8")),
+    file_(*params_.get<std::string>("file","")),
+    extent_(),
+    tr_(new mapnik::transcoder(*params_.get<std::string>("encoding","utf-8"))),
+    features_(),
+    tree_(16,1)
+{
+    if (file_.empty()) throw mapnik::datasource_exception("GeoJSON Plugin: missing <file> parameter");
+    if (bind)
+    {
+        this->bind();
+    }
+}
+
+void geojson_datasource::bind() const
+{
+    if (is_bound_) return;
+
+    typedef std::istreambuf_iterator<char> base_iterator_type;    
+    
+    std::ifstream is(file_.c_str());
+    boost::spirit::multi_pass<base_iterator_type> begin = 
+        boost::spirit::make_default_multi_pass(base_iterator_type(is));
+
+    boost::spirit::multi_pass<base_iterator_type> end = 
+        boost::spirit::make_default_multi_pass(base_iterator_type());
+    
+    mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
+    mapnik::json::feature_collection_parser<boost::spirit::multi_pass<base_iterator_type> > p(ctx,*tr_);
+    bool result = p.parse(begin,end, features_);
+    if (!result) 
+    {
+        MAPNIK_LOG_WARN(geojson) << "geojson_datasource: Failed parse GeoJSON file " << file_;
+        return;
+    }
+    
+    bool first = true;
+    std::size_t count=0;
+    BOOST_FOREACH (mapnik::feature_ptr f, features_)
+    {
+        mapnik::box2d<double> const& box = f->envelope();
+        if (first) 
+        {
+            extent_ = box;
+            first = false;
+        }
+        else
+        {
+            extent_.expand_to_include(box);
+        }       
+        tree_.insert(box_type(point_type(box.minx(),box.miny()),point_type(box.maxx(),box.maxy())), count++);
+    }
+    is_bound_ = true;
+}
+
+geojson_datasource::~geojson_datasource() { }
+
+std::string const geojson_datasource::name_="geojson";
+
+std::string geojson_datasource::name()
+{
+    return name_;
+}
+
+boost::optional<mapnik::datasource::geometry_t> geojson_datasource::get_geometry_type() const 
+{
+    return boost::optional<mapnik::datasource::geometry_t>();
+}
+
+mapnik::datasource::datasource_t geojson_datasource::type() const 
+{
+    return type_;
+}
+
+std::map<std::string, mapnik::parameters> geojson_datasource::get_statistics() const 
+{
+    return statistics_;
+}
+
+mapnik::box2d<double> geojson_datasource::envelope() const
+{
+    if (!is_bound_) bind();
+    return extent_;
+}
+
+mapnik::layer_descriptor geojson_datasource::get_descriptor() const
+{
+    if (!is_bound_) bind();
+
+    return desc_;
+}
+
+mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
+{
+    if (!is_bound_) bind();
+    
+    // if the query box intersects our world extent then query for features
+    mapnik::box2d<double> const& b = q.get_bbox();
+    if (extent_.intersects(b))
+    {
+        box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
+        index_array_ = tree_.find(box);
+        return boost::make_shared<geojson_featureset>(features_, index_array_.begin(), index_array_.end());
+    }    
+    // otherwise return an empty featureset pointer
+    return mapnik::featureset_ptr();
+}
+
+// FIXME
+mapnik::featureset_ptr geojson_datasource::features_at_point(mapnik::coord2d const& pt) const
+{
+    if (!is_bound_) bind();
+    return mapnik::featureset_ptr();
+}

plugins/input/geojson/geojson_datasource.hpp

@@ -0,0 +1,69 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2012 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
+ *
+ *****************************************************************************/
+
+#ifndef GEOJSON_DATASOURCE_HPP
+#define GEOJSON_DATASOURCE_HPP
+
+// mapnik
+#include <mapnik/datasource.hpp>
+// boost
+#include <boost/geometry/geometries/box.hpp>
+#include <boost/geometry/geometries/point_xy.hpp>
+#include <boost/geometry/algorithms/area.hpp>
+#include <boost/geometry/extensions/index/rtree/rtree.hpp>
+#include <boost/geometry/geometries/geometries.hpp>
+#include <boost/geometry/extensions/index/rtree/rtree.hpp>
+
+class geojson_datasource : public mapnik::datasource
+{
+public:
+    typedef boost::geometry::model::d2::point_xy<double> point_type;
+    typedef boost::geometry::model::box<point_type> box_type;
+    typedef boost::geometry::index::rtree<box_type,std::size_t> spatial_index_type;
+    
+    // constructor
+    geojson_datasource(mapnik::parameters const& params, bool bind=true);
+    virtual ~geojson_datasource ();
+    mapnik::datasource::datasource_t type() const;
+    static std::string name();
+    mapnik::featureset_ptr features(mapnik::query const& q) const;
+    mapnik::featureset_ptr features_at_point(mapnik::coord2d const& pt) const;
+    mapnik::box2d<double> envelope() const;
+    mapnik::layer_descriptor get_descriptor() const;
+    std::map<std::string, mapnik::parameters> get_statistics() const;
+    boost::optional<mapnik::datasource::geometry_t> get_geometry_type() const;
+    void bind() const;
+private:    
+    static const std::string name_;
+    mapnik::datasource::datasource_t type_;
+    mutable std::map<std::string, mapnik::parameters> statistics_;
+    mutable mapnik::layer_descriptor desc_;
+    mutable std::string file_;
+    mutable mapnik::box2d<double> extent_;
+    boost::shared_ptr<mapnik::transcoder> tr_;
+    mutable std::vector<mapnik::feature_ptr> features_;
+    mutable spatial_index_type tree_;
+    mutable std::deque<std::size_t> index_array_;
+};
+
+
+#endif // FILE_DATASOURCE_HPP

plugins/input/geojson/geojson_featureset.cpp

@@ -0,0 +1,52 @@
+/*****************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+// mapnik
+#include <mapnik/feature.hpp>
+// stl
+#include <string>
+#include <vector>
+#include <fstream>
+
+#include "geojson_featureset.hpp"
+
+geojson_featureset::geojson_featureset(std::vector<mapnik::feature_ptr> const& features, 
+                                       std::deque<std::size_t>::const_iterator index_itr,
+                                       std::deque<std::size_t>::const_iterator index_end)
+    : features_(features),
+      index_itr_(index_itr),
+      index_end_(index_end) {}
+
+geojson_featureset::~geojson_featureset() {}
+
+mapnik::feature_ptr geojson_featureset::next()
+{
+    if (index_itr_ != index_end_)
+    {
+        std::size_t index = *index_itr_++;        
+        if ( index < features_.size())
+        {
+            return features_.at(index);
+        }
+    }    
+    return mapnik::feature_ptr();
+}

plugins/input/geojson/geojson_featureset.hpp

@@ -0,0 +1,27 @@
+#ifndef GEOJSON_FEATURESET_HPP
+#define GEOJSON_FEATURESET_HPP
+
+#include <mapnik/datasource.hpp>
+#include "geojson_datasource.hpp"
+
+#include <vector>
+#include <deque>
+
+
+class geojson_featureset : public mapnik::Featureset
+{
+public:
+    geojson_featureset(std::vector<mapnik::feature_ptr> const& features,
+                       std::deque<std::size_t>::const_iterator index_itr,
+                       std::deque<std::size_t>::const_iterator index_end);
+    virtual ~geojson_featureset();
+    mapnik::feature_ptr next();
+
+private:
+    mapnik::box2d<double> box_;
+    std::vector<mapnik::feature_ptr> const& features_;
+    std::deque<std::size_t>::const_iterator index_itr_;
+    std::deque<std::size_t>::const_iterator index_end_;
+};
+
+#endif // GEOJSON_FEATURESET_HPP

src/agg/process_markers_symbolizer.cpp

@@ -135,8 +135,8 @@ void agg_renderer<T>::process(markers_symbolizer const& sym,
                         // TODO - impl this for markers?
                         //if (!sym.get_ignore_placement())
                         //    detector_->insert(label_ext);
-                        metawriter_with_properties writer = sym.get_metawriter();
+                        //metawriter_with_properties writer = sym.get_metawriter();
-                        if (writer.first) writer.first->add_box(extent, *feature, t_, writer.second);
+                        //if (writer.first) writer.first->add_box(extent, *feature, t_, writer.second);
                     }
                 }
                 else
@@ -168,12 +168,12 @@ void agg_renderer<T>::process(markers_symbolizer const& sym,
                             //      rotated itself
                         }
 
-                        if (writer.first)
+                        //if (writer.first)
-                        {
+                        //{
                             //writer.first->add_box(label_ext, feature, t_, writer.second);
 
-                            MAPNIK_LOG_DEBUG(agg_renderer) << "agg_renderer: metawriter do not yet supported for line placement";
+                        //  MAPNIK_LOG_DEBUG(agg_renderer) << "agg_renderer: metawriter do not yet supported for line placement";
-                        }
+                        //}
                     }
                 }
             }
@@ -274,7 +274,7 @@ void agg_renderer<T>::process(markers_symbolizer const& sym,
                     }
                     if (!sym.get_ignore_placement())
                         detector_->insert(label_ext);
-                    if (writer.first) writer.first->add_box(label_ext, *feature, t_, writer.second);
+                    //if (writer.first) writer.first->add_box(label_ext, *feature, t_, writer.second);
                 }
             }
             else
@@ -315,12 +315,12 @@ void agg_renderer<T>::process(markers_symbolizer const& sym,
 
 
                     // TODO
-                    if (writer.first)
+                    //if (writer.first)
-                    {
+                    //{
                         //writer.first->add_box(label_ext, feature, t_, writer.second);
 
-                        MAPNIK_LOG_DEBUG(agg_renderer) << "agg_renderer: metawriter do not yet supported for line placement";
+//                        MAPNIK_LOG_DEBUG(agg_renderer) << "agg_renderer: metawriter do not yet supported for line placement";
-                    }
+                        //}
 
                     agg::conv_transform<agg::path_storage, agg::trans_affine> trans(marker, matrix);
                     ras_ptr->add_path(trans);

src/agg/process_point_symbolizer.cpp

@@ -100,8 +100,8 @@ void agg_renderer<T>::process(point_symbolizer const& sym,
 
                 if (!sym.get_ignore_placement())
                     detector_->insert(label_ext);
-                metawriter_with_properties writer = sym.get_metawriter();
+                //metawriter_with_properties writer = sym.get_metawriter();
-                if (writer.first) writer.first->add_box(label_ext, *feature, t_, writer.second);
+                //if (writer.first) writer.first->add_box(label_ext, *feature, t_, writer.second);
             }
         }
     }

src/build.py

@@ -273,6 +273,15 @@ source += Split(
     grid/process_text_symbolizer.cpp
     """)
 
+# metawriter backend
+# grid backend
+source += Split(
+    """
+    metawriter/metawriter_renderer.cpp
+    metawriter/process_line_symbolizer.cpp
+    metawriter/process_point_symbolizer.cpp
+    """)
+
 if env['SVG_RENDERER']: # svg backend
     source += Split(
               """

src/cairo_renderer.cpp

@@ -1172,9 +1172,10 @@ void cairo_renderer_base::start_map_processing(Map const& map)
                     if (!sym.get_ignore_placement())
                         detector_.insert(label_ext);
                     metawriter_with_properties writer = sym.get_metawriter();
-                    if (writer.first)
+                    if (check_metawriter(writer.first))
                     {
-                        writer.first->add_box(label_ext, *feature, t_, writer.second);
+                        //writer.first->add_box(label_ext, *feature, t_, writer.second);
+                        add_box(writer.first, label_ext,*feature, t_, writer.second);
                     }
                 }
             }
@@ -1439,7 +1440,11 @@ void cairo_renderer_base::start_map_processing(Map const& map)
                             //if (!sym.get_ignore_placement())
                             //    detector_.insert(label_ext);
                             metawriter_with_properties writer = sym.get_metawriter();
-                            if (writer.first) writer.first->add_box(extent, *feature, t_, writer.second);
+                            if (check_metawriter(writer.first)) 
+                            {
+                                add_box(writer.first, extent,*feature, t_, writer.second);
+                                //                               writer.first->add_box(extent, *feature, t_, writer.second);
+                            }
                         }
                     }
                     else
@@ -1458,7 +1463,7 @@ void cairo_renderer_base::start_map_processing(Map const& map)
                             agg::trans_affine matrix = recenter * tr * agg::trans_affine_rotation(angle) * agg::trans_affine_translation(x, y);
                             render_marker(pixel_position(x - 0.5 * w, y - 0.5 * h), **mark, matrix, sym.get_opacity(),false);
 
-                            if (writer.first)
+                            if (check_metawriter(writer.first))
                             {
                                 //writer.first->add_box(label_ext, feature, t_, writer.second);
                                 MAPNIK_LOG_WARN(cairo_renderer) << "metawriter not yet supported for LINE placement";
@@ -1548,7 +1553,11 @@ void cairo_renderer_base::start_map_processing(Map const& map)
                         }
                         if (!sym.get_ignore_placement())
                             detector_.insert(label_ext);
-                        if (writer.first) writer.first->add_box(label_ext, *feature, t_, writer.second);
+                        if (check_metawriter(writer.first))
+                        {
+                            add_box(writer.first, label_ext,*feature, t_, writer.second);
+                            //                           writer.first->add_box(label_ext, *feature, t_, writer.second);
+                        }
                     }
                 }
                 else
@@ -1585,7 +1594,7 @@ void cairo_renderer_base::start_map_processing(Map const& map)
                         }
 
                         // TODO
-                        if (writer.first)
+                        if (check_metawriter(writer.first))
                         {
                             //writer.first->add_box(label_ext, feature, t_, writer.second);
                             MAPNIK_LOG_WARN(cairo_renderer) << "metawriter not yet supported for LINE placement";

src/feature_style_processor.cpp

@@ -32,7 +32,7 @@
 #include <mapnik/scale_denominator.hpp>
 #include <mapnik/agg_renderer.hpp>
 #include <mapnik/grid/grid_renderer.hpp>
-
+#include <mapnik/metawriter_renderer.hpp>
 // boost
 #include <boost/foreach.hpp>
 #include <boost/concept_check.hpp>
@@ -78,7 +78,7 @@ struct process_impl<false>
         boost::ignore_unused_variable_warning(f);
         boost::ignore_unused_variable_warning(tr);
 #ifdef MAPNIK_DEBUG
-        std::clog << "NO-OP ...\n";
+        std::clog << "NO-OP " << typeid(sym).name() << std::endl;
 #endif
     }
 };
@@ -98,35 +98,35 @@ struct feature_style_processor<Processor>::symbol_dispatch : public boost::stati
         : output_(output),
           f_(f),
           prj_trans_(prj_trans)  {}
-    
+
     template <typename T>
     void operator () (T const& sym) const
     {
         process_impl<has_process<Processor,T>::value>::process(output_,sym,f_,prj_trans_);
     }
-    
+
     Processor & output_;
     mapnik::feature_ptr const& f_;
     proj_transform const& prj_trans_;
 };
 
-typedef char (&no_tag)[1]; 
+typedef char (&no_tag)[1];
-typedef char (&yes_tag)[2]; 
+typedef char (&yes_tag)[2];
 
-template <typename T0, typename T1, void (T0::*)(T1 const&, mapnik::feature_ptr const&, proj_transform const&) > 
+template <typename T0, typename T1, void (T0::*)(T1 const&, mapnik::feature_ptr const&, proj_transform const&) >
-struct process_memfun_helper {}; 
+struct process_memfun_helper {};
-    
+
-template <typename T0, typename T1> no_tag  has_process_helper(...); 
+template <typename T0, typename T1> no_tag  has_process_helper(...);
 template <typename T0, typename T1> yes_tag has_process_helper(process_memfun_helper<T0, T1, &T0::process>* p);
-    
+
-template<typename T0,typename T1> 
+template<typename T0,typename T1>
 struct has_process
-{      
+{
     typedef typename T0::processor_impl_type processor_impl_type;
-    BOOST_STATIC_CONSTANT(bool 
+    BOOST_STATIC_CONSTANT(bool
-                          , value = sizeof(has_process_helper<processor_impl_type,T1>(0)) == sizeof(yes_tag) 
+                          , value = sizeof(has_process_helper<processor_impl_type,T1>(0)) == sizeof(yes_tag)
-        ); 
+        );
-}; 
+};
 
 
 template <typename Processor>
@@ -149,9 +149,6 @@ void feature_style_processor<Processor>::apply()
     try
     {
         projection proj(m_.srs());
-
-        start_metawriters(m_,proj);
-
         double scale_denom = mapnik::scale_denominator(m_,proj.is_geographic());
         scale_denom *= scale_factor_;
 
@@ -163,8 +160,6 @@ void feature_style_processor<Processor>::apply()
                 apply_to_layer(lyr, p, proj, scale_denom, names);
             }
         }
-
-        stop_metawriters(m_);
     }
     catch (proj_init_error& ex)
     {
@@ -203,30 +198,6 @@ void feature_style_processor<Processor>::apply(mapnik::layer const& lyr, std::se
     p.end_map_processing(m_);
 }
 
-template <typename Processor>
-void feature_style_processor<Processor>::start_metawriters(Map const& m_, projection const& proj)
-{
-    Map::const_metawriter_iterator metaItr = m_.begin_metawriters();
-    Map::const_metawriter_iterator metaItrEnd = m_.end_metawriters();
-    for (;metaItr!=metaItrEnd; ++metaItr)
-    {
-        metaItr->second->set_size(m_.width(), m_.height());
-        metaItr->second->set_map_srs(proj);
-        metaItr->second->start(m_.metawriter_output_properties);
-    }
-}
-
-template <typename Processor>
-void feature_style_processor<Processor>::stop_metawriters(Map const& m_)
-{
-    Map::const_metawriter_iterator metaItr = m_.begin_metawriters();
-    Map::const_metawriter_iterator metaItrEnd = m_.end_metawriters();
-    for (;metaItr!=metaItrEnd; ++metaItr)
-    {
-        metaItr->second->stop();
-    }
-}
-
 template <typename Processor>
 void feature_style_processor<Processor>::apply_to_layer(layer const& lay, Processor & p,
                                                         projection const& proj0,
@@ -516,7 +487,7 @@ void feature_style_processor<Processor>::render_style(
 {
 
     p.start_style_processing(*style);
-    
+
 #if defined(RENDERING_STATS)
     std::ostringstream s1;
     s1 << "rendering style for layer: '" << lay.name()
@@ -552,18 +523,13 @@ void feature_style_processor<Processor>::render_style(
 
                 do_else=false;
                 do_also=true;
+
                 rule::symbolizers const& symbols = r->get_symbolizers();
-
+                BOOST_FOREACH (symbolizer const& sym, symbols)
-                // if the underlying renderer is not able to process the complete set of symbolizers,
-                // process one by one.
-                if(!p.process(symbols,feature,prj_trans))
                 {
-
+                    boost::apply_visitor(symbol_dispatch(p,feature,prj_trans),sym);
-                    BOOST_FOREACH (symbolizer const& sym, symbols)
-                    {
-                        boost::apply_visitor(symbol_dispatch(p,feature,prj_trans),sym);
-                    }
                 }
+
                 if (style->get_filter_mode() == FILTER_FIRST)
                 {
                     // Stop iterating over rules and proceed with next feature.
@@ -582,14 +548,9 @@ void feature_style_processor<Processor>::render_style(
                 p.painted(true);
 
                 rule::symbolizers const& symbols = r->get_symbolizers();
-                // if the underlying renderer is not able to process the complete set of symbolizers,
+                BOOST_FOREACH (symbolizer const& sym, symbols)
-                // process one by one.
-                if(!p.process(symbols,feature,prj_trans))
                 {
-                    BOOST_FOREACH (symbolizer const& sym, symbols)
+                    boost::apply_visitor(symbol_dispatch(p,feature,prj_trans),sym);
-                    {
-                        boost::apply_visitor(symbol_dispatch(p,feature,prj_trans),sym);
-                    }
                 }
             }
         }
@@ -604,14 +565,10 @@ void feature_style_processor<Processor>::render_style(
                 p.painted(true);
 
                 rule::symbolizers const& symbols = r->get_symbolizers();
-                // if the underlying renderer is not able to process the complete set of symbolizers,
+
-                // process one by one.
+                BOOST_FOREACH (symbolizer const& sym, symbols)
-                if(!p.process(symbols,feature,prj_trans))
                 {
-                    BOOST_FOREACH (symbolizer const& sym, symbols)
+                    boost::apply_visitor(symbol_dispatch(p,feature,prj_trans),sym);
-                    {
-                        boost::apply_visitor(symbol_dispatch(p,feature,prj_trans),sym);
-                    }
                 }
             }
         }
@@ -656,6 +613,6 @@ template class feature_style_processor<svg_renderer<std::ostream_iterator<char>
 
 template class feature_style_processor<grid_renderer<grid> >;
 template class feature_style_processor<agg_renderer<image_32> >;
+template class feature_style_processor<metawriter_renderer>;
 
 }
-

src/load_map.cpp

@@ -498,7 +498,7 @@ void map_parser::parse_style(Map & map, xml_node const& sty)
 void map_parser::parse_metawriter(Map & map, xml_node const& pt)
 {
     std::string name("<missing name>");
-    metawriter_ptr writer;
+    metawriter writer;
     try
     {
         name = pt.get_attr<std::string>("name");

src/map.cpp

@@ -169,7 +169,7 @@ boost::optional<feature_type_style const&> Map::find_style(std::string const& na
         return boost::optional<feature_type_style const&>() ;
 }
 
-bool Map::insert_metawriter(std::string const& name, metawriter_ptr const& writer)
+bool Map::insert_metawriter(std::string const& name, metawriter const& writer)
 {
     return metawriters_.insert(make_pair(name, writer)).second;
 }
@@ -179,16 +179,16 @@ void Map::remove_metawriter(std::string const& name)
     metawriters_.erase(name);
 }
 
-metawriter_ptr Map::find_metawriter(std::string const& name) const
+metawriter Map::find_metawriter(std::string const& name) const
 {
-    std::map<std::string, metawriter_ptr>::const_iterator itr = metawriters_.find(name);
+    std::map<std::string, metawriter>::const_iterator itr = metawriters_.find(name);
     if (itr != metawriters_.end())
         return itr->second;
     else
-        return metawriter_ptr();
+        return metawriter();
 }
 
-std::map<std::string,metawriter_ptr> const& Map::metawriters() const
+std::map<std::string,metawriter> const& Map::metawriters() const
 {
     return metawriters_;
 }

src/metawriter.cpp

@@ -97,7 +97,7 @@ metawriter_json_stream::~metawriter_json_stream()
 
 
 metawriter_json_stream::metawriter_json_stream(metawriter_properties dflt_properties)
-    : metawriter(dflt_properties), count_(-1), output_empty_(true),
+    : metawriter_base(dflt_properties), count_(-1), output_empty_(true),
       trans_(0), output_srs_("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"),
       pixel_coordinates_(false), f_(0)
 {
@@ -170,7 +170,8 @@ void metawriter_json_stream::add_box(box2d<double> const &box, Feature const& fe
         minx << ", " << miny << "], [" <<
         maxx << ", " << miny << "], [" <<
         maxx << ", " << maxy << "], [" <<
-        minx << ", " << maxy << "] ] ]";
+        minx << ", " << maxy << "], [" <<
+        minx << ", " << miny << "] ] ]";
 
     write_properties(feature, properties);
 
@@ -262,7 +263,8 @@ void metawriter_json_stream::add_text(
     }
 }
 
-void metawriter_json_stream::add_polygon(path_type & path,
+template <typename T>
+void metawriter_json_stream::add_polygon(T & path,
                                          Feature const& feature,
                                          CoordTransform const& t,
                                          metawriter_properties const& properties)
@@ -272,42 +274,6 @@ void metawriter_json_stream::add_polygon(path_type & path,
     write_properties(feature, properties);
 }
 
-void metawriter_json_stream::add_line(path_type & path,
-                                      Feature const& feature,
-                                      CoordTransform const& t,
-                                      metawriter_properties const& properties)
-{
-    write_feature_header("MultiLineString");
-    write_line_polygon(path, t, false);
-    write_properties(feature, properties);
-}
-
-void metawriter_json_stream::write_line_polygon(path_type & path, CoordTransform const& t, bool /*polygon*/){
-    *f_ << " [";
-    double x, y, last_x=0.0, last_y=0.0;
-    unsigned cmd, last_cmd = SEG_END;
-    path.rewind(0);
-
-    int polygon_count = 0;
-    while ((cmd = path.vertex(&x, &y)) != SEG_END) {
-        if (cmd == SEG_LINETO) {
-            if (last_cmd == SEG_MOVETO) {
-                //Start new polygon/line
-                if (polygon_count++) *f_ << "], ";
-                *f_ << "[";
-                write_point(t, last_x, last_y, true);
-            }
-            *f_ << ",";
-            write_point(t, x, y, true);
-        }
-        last_x = x;
-        last_y = y;
-        last_cmd = cmd;
-    }
-    *f_ << "]]";
-}
-
-
 void metawriter_json_stream::set_map_srs(projection const& input_srs_)
 {
     if (trans_) delete trans_;
@@ -327,7 +293,15 @@ void metawriter_json::start(metawriter_property_map const& properties)
 
     MAPNIK_LOG_DEBUG(metawriter) << "metawriter_json: Filename=" << filename_;
 
-    metawriter_json_stream::start(properties);
+
+    assert(trans_);
+    if (output_empty_) {
+        write_header();
+    } else {
+        count_ = HEADER_NOT_WRITTEN;
+    }
+    
+    //metawriter_json_stream::start(properties);
 }
 
 void metawriter_json::write_header()
@@ -337,7 +311,7 @@ void metawriter_json::write_header()
     {
         MAPNIK_LOG_DEBUG(metawriter) << "metawriter_json: Failed to open file " << filename_;
     }
-    set_stream(&f_);
+    metawriter_json_stream::set_stream(&f_);
     metawriter_json_stream::write_header();
 }
 

src/metawriter/metawriter_renderer.cpp

@@ -0,0 +1,138 @@
+/*****************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+// mapnik
+#include <mapnik/graphics.hpp>
+#include <mapnik/metawriter_renderer.hpp>
+#include <mapnik/marker.hpp>
+#include <mapnik/marker_cache.hpp>
+#include <mapnik/unicode.hpp>
+#include <mapnik/font_set.hpp>
+#include <mapnik/parse_path.hpp>
+#include <mapnik/map.hpp>
+
+// boost
+#include <boost/utility.hpp>
+#include <boost/make_shared.hpp>
+#include <boost/math/special_functions/round.hpp>
+
+// stl
+#include <cmath>
+
+namespace mapnik
+{
+
+metawriter_renderer::metawriter_renderer(Map const& m,double scale_factor, unsigned offset_x, unsigned offset_y)
+    : feature_style_processor<metawriter_renderer>(m, scale_factor),
+      width_(m.width()),
+      height_(m.height()),
+      scale_factor_(scale_factor),
+      t_(m.width(),m.height(),m.get_current_extent(),offset_x,offset_y),
+      font_engine_(),
+      font_manager_(font_engine_),
+      detector_(boost::make_shared<label_collision_detector4>(box2d<double>(-m.buffer_size(), -m.buffer_size(), m.width() + m.buffer_size() ,m.height() + m.buffer_size())))
+{
+    setup(m);
+}
+
+metawriter_renderer::metawriter_renderer(Map const& m, boost::shared_ptr<label_collision_detector4> detector,
+                              double scale_factor, unsigned offset_x, unsigned offset_y)
+    : feature_style_processor<metawriter_renderer>(m, scale_factor),
+      width_(m.width()),
+      height_(m.height()),
+      scale_factor_(scale_factor),
+      t_(m.width(),m.height(),m.get_current_extent(),offset_x,offset_y),
+      font_engine_(),
+      font_manager_(font_engine_),
+      detector_(detector)
+{
+    setup(m);
+}
+
+void metawriter_renderer::setup(Map const &m)
+{
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: Scale=" << m.scale();
+}
+
+metawriter_renderer::~metawriter_renderer() {}
+
+void metawriter_renderer::start_map_processing(Map const& m)
+{
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: Start map processing bbox=" << m.get_current_extent();
+
+    projection proj(m.srs());
+    Map::const_metawriter_iterator metaItr = m.begin_metawriters();
+    Map::const_metawriter_iterator metaItrEnd = m.end_metawriters();
+    for (;metaItr!=metaItrEnd; ++metaItr)
+    {
+        set_size(metaItr->second, m.width(), m.height());
+        set_map_srs(metaItr->second, proj);
+        start(metaItr->second, m.metawriter_output_properties);
+    }
+}
+
+void metawriter_renderer::end_map_processing(Map const& m)
+{
+    Map::const_metawriter_iterator metaItr = m.begin_metawriters();
+    Map::const_metawriter_iterator metaItrEnd = m.end_metawriters();
+    for (;metaItr!=metaItrEnd; ++metaItr)
+    {
+        stop(metaItr->second);
+    }
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: End map processing";
+}
+
+void metawriter_renderer::start_layer_processing(layer const& lay, box2d<double> const& query_extent)
+{
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: Start processing layer=" << lay.name();
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: -- datasource=" << lay.datasource().get();
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: -- query_extent=" << query_extent;
+
+    if (lay.clear_label_cache())
+    {
+        detector_->clear();
+    }
+    query_extent_ = query_extent;
+}
+
+void metawriter_renderer::end_layer_processing(layer const&)
+{
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: End layer processing";
+}
+
+void metawriter_renderer::start_style_processing(feature_type_style const& st)
+{
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: Start processing style";
+}
+
+void metawriter_renderer::end_style_processing(feature_type_style const& st)
+{
+    MAPNIK_LOG_DEBUG(metawriter_renderer) << "metawriter_renderer: End processing style";
+}
+
+void metawriter_renderer::painted(bool painted)
+{
+    //
+}
+
+
+}

src/metawriter/process_line_symbolizer.cpp

@@ -0,0 +1,92 @@
+/*****************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+// boost
+#include <boost/foreach.hpp>
+// mapnik
+#include <mapnik/metawriter_renderer.hpp>
+#include <mapnik/metawriter_factory.hpp>
+#include <mapnik/line_symbolizer.hpp>
+#include <mapnik/vertex_converters.hpp>
+
+// stl
+#include <string>
+#include <cmath>
+
+namespace mapnik {
+
+struct metawriter_wrap
+{
+    metawriter_wrap(metawriter_with_properties const& w, feature_impl const& f, CoordTransform const& t)
+        : writer(w),
+          feature(f),
+          tr(t) 
+    {}
+    
+    template <typename T>
+    void add_path(T & path)
+    {        
+        if (check_metawriter(writer.first)) 
+        {
+            add_line(writer.first, path, feature, tr, writer.second);
+        }
+    }
+    
+    metawriter_with_properties const& writer;  
+    feature_impl const& feature;
+    CoordTransform const& tr;
+};
+
+void metawriter_renderer::process(line_symbolizer const& sym,
+                                  mapnik::feature_ptr const& feature,
+                                  proj_transform const& prj_trans)
+
+{
+    agg::trans_affine tr;
+    evaluate_transform(tr, *feature, sym.get_transform());
+    metawriter_with_properties writer = sym.get_metawriter();
+    metawriter_wrap wrap(writer,*feature,t_);
+    
+    typedef boost::mpl::vector<clip_line_tag,
+                               transform_tag,
+                               offset_transform_tag, 
+                               affine_transform_tag, 
+                               smooth_tag, 
+                               dash_tag, 
+                               stroke_tag> conv_types;
+    
+    vertex_converter<box2d<double>,metawriter_wrap,line_symbolizer,CoordTransform, proj_transform, agg::trans_affine, conv_types>
+        converter(query_extent_,wrap,sym,t_,prj_trans,tr,scale_factor_);
+    
+    if (sym.clip()) converter.set<clip_line_tag>(); // optional clip (default: true)
+    converter.set<transform_tag>(); // always transform
+    
+    BOOST_FOREACH( geometry_type & geom, feature->paths())
+    {
+        if (geom.num_points() > 1)
+        {
+            converter.apply(geom);            
+        }
+    }
+}
+
+}

src/metawriter/process_point_symbolizer.cpp

@@ -0,0 +1,95 @@
+/*****************************************************************************
+ *
+ * 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
+ *
+ *****************************************************************************/
+
+// mapnik
+#include <mapnik/image_util.hpp>
+#include <mapnik/marker.hpp>
+#include <mapnik/marker_cache.hpp>
+#include <mapnik/point_symbolizer.hpp>
+#include <mapnik/metawriter_renderer.hpp>
+#include <mapnik/metawriter_factory.hpp>
+
+// stl
+#include <string>
+
+// boost
+#include <boost/make_shared.hpp>
+
+namespace mapnik {
+
+void metawriter_renderer::process(point_symbolizer const& sym,
+                              mapnik::feature_ptr const& feature,
+                              proj_transform const& prj_trans)
+{
+    std::string filename = path_processor_type::evaluate(*sym.get_filename(), *feature);
+
+    boost::optional<mapnik::marker_ptr> marker;
+    if ( !filename.empty() )
+    {
+        marker = marker_cache::instance()->find(filename, true);
+    }
+    else
+    {
+        marker.reset(boost::make_shared<mapnik::marker>());
+    }
+
+    if (marker)
+    {
+        box2d<double> const& bbox = (*marker)->bounding_box();
+        coord2d const center = bbox.center();
+
+        agg::trans_affine tr;
+        evaluate_transform(tr, *feature, sym.get_image_transform());
+
+        agg::trans_affine_translation const recenter(-center.x, -center.y);
+        agg::trans_affine const recenter_tr = recenter * tr;
+        box2d<double> label_ext = bbox * recenter_tr;
+
+        for (unsigned i=0; i<feature->num_geometries(); ++i)
+        {
+            geometry_type const& geom = feature->get_geometry(i);
+            double x;
+            double y;
+            double z=0;
+            if (sym.get_point_placement() == CENTROID_POINT_PLACEMENT)
+                geom.label_position(&x, &y);
+            else
+                geom.label_interior_position(&x, &y);
+
+            prj_trans.backward(x,y,z);
+            t_.forward(&x,&y);
+            label_ext.re_center(x,y);
+
+            if (sym.get_allow_overlap() ||
+                detector_->has_placement(label_ext))
+            {                
+                if (!sym.get_ignore_placement())
+                    detector_->insert(label_ext);
+                metawriter_with_properties writer = sym.get_metawriter();
+                add_box(writer.first, label_ext,*feature, t_, writer.second);
+            }
+        }
+    }
+}
+}
+
+

src/metawriter_factory.cpp

@@ -38,42 +38,49 @@ using std::string;
 namespace mapnik
 {
 
-metawriter_ptr
+metawriter metawriter_create(xml_node const& pt)
-metawriter_create(xml_node const& pt)
 {
-    metawriter_ptr writer;
+    metawriter writer;
     string type = pt.get_attr<string>("type");
-
+    
     optional<string> properties = pt.get_opt_attr<string>("default-output");
-    if (type == "json") {
+    if (type == "json") 
+    {
         string file = pt.get_attr<string>("file");
         metawriter_json_ptr json = boost::make_shared<metawriter_json>(properties, parse_path(file));
         optional<boolean> output_empty = pt.get_opt_attr<boolean>("output-empty");
-        if (output_empty) {
+        if (output_empty) 
+        {
             json->set_output_empty(*output_empty);
         }
-
+        
         optional<boolean> pixel_coordinates = pt.get_opt_attr<boolean>("pixel-coordinates");
-        if (pixel_coordinates) {
+        if (pixel_coordinates) 
+        {
             json->set_pixel_coordinates(*pixel_coordinates);
         }
         writer = json;
 
-    } else if (type == "inmem") {
+    } 
+    else if (type == "inmem") 
+    {
         metawriter_inmem_ptr inmem = boost::make_shared<metawriter_inmem>(properties);
         writer = inmem;
-    } else {
+    } 
+    else 
+    {
         throw config_error(string("Unknown type '") + type + "'", pt);
     }
-
+    
     return writer;
 }
 
-void
+void metawriter_save(metawriter const& writer,
-metawriter_save(const metawriter_ptr &metawriter,
+                     boost::property_tree::ptree & metawriter_node, 
-                boost::property_tree::ptree &metawriter_node, bool explicit_defaults)
+                     bool explicit_defaults)
 {
-
+    // FIXME
+    /*
     metawriter_json *json = dynamic_cast<metawriter_json *>(metawriter.get());
     if (json) {
         set_attr(metawriter_node, "type", "json");
@@ -91,6 +98,7 @@ metawriter_save(const metawriter_ptr &metawriter,
     if (!metawriter->get_default_properties().empty() || explicit_defaults) {
         set_attr(metawriter_node, "default-output", metawriter->get_default_properties().to_string());
     }
+    */
 }
 
 } // namespace mapnik

src/metawriter_inmem.cpp

@@ -28,49 +28,27 @@
 // Boost
 #include <boost/foreach.hpp>
 
-using std::map;
-using std::string;
-
-namespace {
-
-using mapnik::value;
-using mapnik::Feature;
-using mapnik::metawriter_properties;
-
-// intersect a set of properties with those in the feature descriptor
-map<string,value> intersect_properties(Feature const& feature, metawriter_properties const& properties) {
-
-    map<string,value> nprops;
-    BOOST_FOREACH(string p, properties)
-    {
-        if (feature.has_key(p))
-            nprops.insert(std::make_pair(p,feature.get(p)));
-    }
-
-    return nprops;
-}} // end anonymous namespace
 
 namespace mapnik {
 
 metawriter_inmem::metawriter_inmem(metawriter_properties dflt_properties)
-    : metawriter(dflt_properties) {
+    : metawriter_base(dflt_properties) {
 }
 
 metawriter_inmem::~metawriter_inmem() {
 }
 
-void
+void metawriter_inmem::add_box(box2d<double> const& box, Feature const& feature,
-metawriter_inmem::add_box(box2d<double> const& box, Feature const& feature,
                           CoordTransform const& /*t*/,
-                          metawriter_properties const& properties) {
+                          metawriter_properties const& properties) 
+{
     meta_instance inst;
     inst.box = box;
     inst.properties = intersect_properties(feature, properties);
     instances_.push_back(inst);
 }
 
-void
+void metawriter_inmem::add_text(
-metawriter_inmem::add_text(
     boost::ptr_vector<text_path> & /*text*/,
     box2d<double> const& extents,
     Feature const& feature,
@@ -86,27 +64,21 @@ metawriter_inmem::add_text(
     }
 }
 
-void
+template <typename T>
-metawriter_inmem::add_polygon(path_type & path,
+void metawriter_inmem::add_polygon(T & path,
-                              Feature const& feature,
+                                   Feature const& feature,
-                              CoordTransform const& t,
+                                   CoordTransform const& t,
-                              metawriter_properties const& properties) {
+                                   metawriter_properties const& properties) 
+{
     add_vertices(path, feature, t, properties);
 }
 
-void
-metawriter_inmem::add_line(path_type & path,
-                           Feature const& feature,
-                           CoordTransform const& t,
-                           metawriter_properties const& properties) {
-    add_vertices(path, feature, t, properties);
-}
 
-void
+template <typename T>
-metawriter_inmem::add_vertices(path_type & path,
+void metawriter_inmem::add_vertices(T & path,
-                               Feature const& feature,
+                                    Feature const& feature,
-                               CoordTransform const& /*t*/,
+                                    CoordTransform const& /*t*/,
-                               metawriter_properties const& properties) {
+                                    metawriter_properties const& properties) {
     box2d<double> box;
     unsigned cmd;
     double x = 0.0, y = 0.0;

src/save_map.cpp

@@ -698,8 +698,8 @@ void serialize_layer( ptree & map_node, const layer & layer, bool explicit_defau
 void serialize_metawriter(ptree & map_node, Map::const_metawriter_iterator metawriter_it, bool explicit_defaults)
 {
     std::string const& name = metawriter_it->first;
-    metawriter_ptr const& metawriter = metawriter_it->second;
+    metawriter const& metawriter = metawriter_it->second;
-
+    
     ptree & metawriter_node = map_node.push_back(
         ptree::value_type("MetaWriter", ptree()))->second;
 

src/symbolizer.cpp

@@ -48,7 +48,7 @@ symbolizer_base::symbolizer_base()
     : properties_(),
       properties_complete_(),
       writer_name_(),
-      writer_ptr_(),
+      writer_(),
       comp_op_(src_over),
       clip_(true),
       smooth_value_(0.0)
@@ -57,7 +57,11 @@ symbolizer_base::symbolizer_base()
 
 // copy ctor
 symbolizer_base::symbolizer_base(symbolizer_base const& other)
-    : comp_op_(other.comp_op_),
+    : properties_(other.properties_),
+      properties_complete_(other.properties_complete_),
+      writer_name_(other.writer_name_),
+      writer_(other.writer_),
+      comp_op_(other.comp_op_),
       affine_transform_(other.affine_transform_),
       clip_(other.clip_),
       smooth_value_(other.smooth_value_) {}
@@ -68,16 +72,19 @@ void symbolizer_base::add_metawriter(std::string const& name, metawriter_propert
     properties_ = properties;
 }
 
-void symbolizer_base::add_metawriter(metawriter_ptr writer_ptr, metawriter_properties const& properties,
+void symbolizer_base::add_metawriter(metawriter const& writer, metawriter_properties const& properties,
                                      std::string const& name)
 {
-    writer_ptr_ = writer_ptr;
+    writer_ = writer;
     properties_ = properties;
     writer_name_ = name;
-    if (writer_ptr) {
+    if (check_metawriter(writer)) 
-        properties_complete_ = writer_ptr->get_default_properties();
+    {
+        //properties_complete_ = writer_->get_default_properties(); FIXME
         properties_complete_.insert(properties_.begin(), properties_.end());
-    } else {
+    } 
+    else 
+    {
         properties_complete_.clear();
     }
 }
@@ -86,15 +93,17 @@ void symbolizer_base::cache_metawriters(Map const &m)
 {
     if (writer_name_.empty()) {
         properties_complete_.clear();
-        writer_ptr_ = metawriter_ptr();
         return; // No metawriter
     }
-
+    
-    writer_ptr_ = m.find_metawriter(writer_name_);
+    writer_ = m.find_metawriter(writer_name_);
-    if (writer_ptr_) {
+    if (check_metawriter(writer_)) 
-        properties_complete_ = writer_ptr_->get_default_properties();
+    {
+        // properties_complete_ = writer_->get_default_properties(); FIXME
         properties_complete_.insert(properties_.begin(), properties_.end());
-    } else {
+    } 
+    else 
+    {
         properties_complete_.clear();
         MAPNIK_LOG_WARN(symbolizer) << "Metawriter '" << writer_name_ << "' used but not defined.";
     }
@@ -102,7 +111,7 @@ void symbolizer_base::cache_metawriters(Map const &m)
 
 metawriter_with_properties symbolizer_base::get_metawriter() const
 {
-    return metawriter_with_properties(writer_ptr_, properties_complete_);
+    return metawriter_with_properties(writer_, properties_complete_);
 }
 
 void symbolizer_base::set_comp_op(composite_mode_e comp_op)

src/symbolizer_helpers.cpp

@@ -71,9 +71,9 @@ bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_line_placement()
                 finder_->update_detector();
             }
             geo_itr_ = geometries_to_process_.erase(geo_itr_);
-            if (writer_.first) writer_.first->add_text(
+            //if (writer_.first) writer_.first->add_text(
-                finder_->get_results(), finder_->get_extents(),
+            //    finder_->get_results(), finder_->get_extents(),
-                feature_, t_, writer_.second);
+            //    feature_, t_, writer_.second);
             return true;
         }
         //No placement for this geometry. Keep it in geometries_to_process_ for next try.
@@ -101,9 +101,9 @@ bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
         {
             //Found a placement
             point_itr_ = points_.erase(point_itr_);
-            if (writer_.first) writer_.first->add_text(
+//            if (writer_.first) writer_.first->add_text(
-                finder_->get_results(), finder_->get_extents(),
+//                finder_->get_results(), finder_->get_extents(),
-                feature_, t_, writer_.second);
+//                feature_, t_, writer_.second);
             finder_->update_detector();
             return true;
         }
@@ -240,7 +240,7 @@ bool text_symbolizer_helper<FaceManagerT, DetectorT>::next_placement()
     finder_ = boost::shared_ptr<placement_finder<DetectorT> >(new placement_finder<DetectorT>(feature_, *placement_, *info_, detector_, dims_));
 //    boost::make_shared<placement_finder<DetectorT> >(feature_, *placement_, *info_, detector_, dims_);
 
-    if (writer_.first) finder_->set_collect_extents(true);
+    if (check_metawriter(writer_.first)) finder_->set_collect_extents(true);
 
     placement_valid_ = true;
     return true;
@@ -316,11 +316,11 @@ bool shield_symbolizer_helper<FaceManagerT, DetectorT>::next_point_placement()
         {
             detector_.insert(marker_ext_);
             finder_->update_detector();
-            if (writer_.first) {
+            //if (writer_.first) {
-                writer_.first->add_box(marker_ext_, feature_, t_, writer_.second);
+            //    writer_.first->add_box(marker_ext_, feature_, t_, writer_.second);
-                writer_.first->add_text(finder_->get_results(), finder_->get_extents(),
+            //    writer_.first->add_text(finder_->get_results(), finder_->get_extents(),
-                                        feature_, t_, writer_.second);
+            //                            feature_, t_, writer_.second);
-            }
+            //}
             point_itr_ = points_.erase(point_itr_);
             return true;
         }
@@ -393,7 +393,7 @@ pixel_position shield_symbolizer_helper<FaceManagerT, DetectorT>::get_marker_pos
         marker_ext_.re_center(lx, ly);
         //label is added to detector by get_line_placement(), but marker isn't
         detector_.insert(marker_ext_);
-        if (writer_.first) writer_.first->add_box(marker_ext_, feature_, t_, writer_.second);
+        //if (writer_.first) writer_.first->add_box(marker_ext_, feature_, t_, writer_.second); // FIXME
         return pixel_position(px, py);
     } else {
         //collision_detector is already updated for point placement in get_point_placement()