+ add 'clip' property

include/mapnik/polygon_symbolizer.hpp

@@ -46,12 +46,15 @@ struct MAPNIK_DECL polygon_symbolizer : public symbolizer_base
     gamma_method_e get_gamma_method() const;
     void set_smooth(double smooth);
     double smooth() const;
+    void set_clip(bool clip);
+    bool clip() const;
 private:
     color fill_;
     double opacity_;
     double gamma_;
     gamma_method_e gamma_method_;
     double smooth_;
+    bool clip_;
 };
 
 }

src/load_map.cpp

@@ -1325,6 +1325,10 @@ void map_parser::parse_polygon_symbolizer(rule & rule, xml_node const & sym)
         optional<double> smooth = sym.get_opt_attr<double>("smooth");
         if (smooth) poly_sym.set_smooth(*smooth);
 
+        // to clip or not to clip value
+        optional<bool> clip = sym.get_opt_attr<bool>("clip");
+        if (clip) poly_sym.set_clip(*clip);
+        
         parse_metawriter_in_symbolizer(poly_sym, sym);
         rule.append(poly_sym);
     }

src/polygon_symbolizer.cpp

@@ -33,7 +33,8 @@ polygon_symbolizer::polygon_symbolizer()
       opacity_(1.0),
       gamma_(1.0),
       gamma_method_(GAMMA_POWER),
-      smooth_(0.0) {}
+      smooth_(0.0),
+      clip_(true) {}
 
 polygon_symbolizer::polygon_symbolizer(color const& fill)
     : symbolizer_base(),
@@ -41,7 +42,8 @@ polygon_symbolizer::polygon_symbolizer(color const& fill)
       opacity_(1.0),
       gamma_(1.0),
       gamma_method_(GAMMA_POWER),
-      smooth_(0.0) {}
+      smooth_(0.0),
+      clip_(true) {}
 
 color const& polygon_symbolizer::get_fill() const
 {
@@ -93,4 +95,13 @@ double polygon_symbolizer::smooth() const
     return smooth_;
 }
 
+void polygon_symbolizer::set_clip(bool clip)
+{
+    clip_ = clip;
+}
+
+bool polygon_symbolizer::clip() const
+{
+    return clip_;
+}
 }