lib/terraformer/polygon.rb in terraformer-0.0.9 vs lib/terraformer/polygon.rb in terraformer-0.1.0

@@ -108,10 +108,10 @@
         raise ArgumentError.new "unsupported type: #{obj.type rescue obj.class}"
       end
     end
 
     def add_vertex p
-      insert_vertex coordinates[0].length - 2, p
+      insert_vertex -2, p
     end
     alias_method :<<, :add_vertex
 
     def insert_vertex idx, p
       p = p.coordinates if Point === p