From 5eb406c7df950acd4c4430c77899ea89390a2020 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Wed, 20 Nov 2013 15:12:11 +0000
Subject: [PATCH] geojson parser : only close path if we have at least 3
 vertices

---
 include/mapnik/json/geometry_grammar.hpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/mapnik/json/geometry_grammar.hpp b/include/mapnik/json/geometry_grammar.hpp
index 821ab9646..416442161 100644
--- a/include/mapnik/json/geometry_grammar.hpp
+++ b/include/mapnik/json/geometry_grammar.hpp
@@ -58,7 +58,10 @@ struct close_path
     result_type operator() (T path) const
     {
         BOOST_ASSERT( path!=0 );
-        path->close_path();
+        if (path->size() > 2u) // to form a polygon ring we need at least 3 vertices
+        {
+            path->close_path();
+        }
     }
 };