From dd104b0b1b7ce081339718c192deff3c196217c1 Mon Sep 17 00:00:00 2001
From: Blake Thompson <flippmoke@gmail.com>
Date: Tue, 9 Jun 2015 11:31:50 -0500
Subject: [PATCH] Updated offset converter to remove large spikes

---
 include/mapnik/offset_converter.hpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/mapnik/offset_converter.hpp b/include/mapnik/offset_converter.hpp
index b32d8170c..ea0d5f069 100644
--- a/include/mapnik/offset_converter.hpp
+++ b/include/mapnik/offset_converter.hpp
@@ -47,7 +47,7 @@ struct MAPNIK_DECL offset_converter
     offset_converter(Geometry & geom)
         : geom_(geom)
         , offset_(0.0)
-        , threshold_(5.0)
+        , threshold_(8.0)
         , half_turn_segments_(16)
         , status_(initial)
         , pre_first_(vertex2d::no_init)
@@ -266,6 +266,14 @@ private:
         double sa = offset_ * std::sin(a);
         double ca = offset_ * std::cos(a);
         double h = std::tan(0.5 * (b - a));
+        if (h > 3.0)
+        {
+            h = 3.0;
+        }
+        else if (h < -3.0)
+        {
+            h = -3.0;
+        }
         v.x = v.x + sa + h * ca;
         v.y = v.y - ca + h * sa;
     }