From 7b2a4cb5896ae7fbaa8cd7a6b93e239859605caa Mon Sep 17 00:00:00 2001
From: Barend Gehrels <barend@xs4all.nl>
Date: Sat, 3 May 2014 14:41:33 +0200
Subject: [PATCH] [intersection] fix segments_intersection_ratios adding the
 new one_degenerate method

---
 .../policies/relate/intersection_ratios.hpp    | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/boost/geometry/policies/relate/intersection_ratios.hpp b/include/boost/geometry/policies/relate/intersection_ratios.hpp
index 0e4506eda..81ecba0b5 100644
--- a/include/boost/geometry/policies/relate/intersection_ratios.hpp
+++ b/include/boost/geometry/policies/relate/intersection_ratios.hpp
@@ -99,6 +99,24 @@ struct segments_intersection_ratios
     {
         return return_type();
     }
+
+    template <typename Segment, typename Ratio>
+    static inline return_type one_degenerate(Segment const& ,
+            Ratio const& ratio, bool a_degenerate)
+    {
+        return_type result;
+        if (a_degenerate)
+        {
+            // IP lies on ratio w.r.t. segment b
+            result.assign(Ratio::zero(), ratio);
+        }
+        else
+        {
+            result.assign(ratio, Ratio::zero());
+        }
+        return result;
+    }
+
 };