From a5dd351b41cb88e8180db429f72e5f8b17345b0a Mon Sep 17 00:00:00 2001
From: Daria Volvenkova <d.volvenkova@corp.mail.ru>
Date: Fri, 2 Dec 2016 19:40:08 +0300
Subject: [PATCH] Fixed crash on segment vector normalization.

---
 drape_frontend/rule_drawer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drape_frontend/rule_drawer.cpp b/drape_frontend/rule_drawer.cpp
index fcddf690cf..548cc08efe 100644
--- a/drape_frontend/rule_drawer.cpp
+++ b/drape_frontend/rule_drawer.cpp
@@ -80,7 +80,8 @@ void ExtractTrafficGeometry(FeatureType const & f, df::RoadClass const & roadCla
 
       auto const segment = polyline.ExtractSegment(segIndex, isReversed);
       ASSERT_EQUAL(segment.size(), 2, ());
-      if (needTwoWayOffset)
+      double const kEps = 1e-5;
+      if (needTwoWayOffset && !segment[0].EqualDxDy(segment[1], kEps))
       {
         m2::PointD const tangent = (segment[1] - segment[0]).Normalize();
         m2::PointD const normal = isLeftHandTraffic ? m2::PointD(-tangent.y, tangent.x) :