From 72283f867da7cb3cb47ff51fa92f1a84a2f5ee0f Mon Sep 17 00:00:00 2001
From: Adam Reichold <adam.reichold@t-online.de>
Date: Wed, 2 Mar 2016 22:04:48 +0100
Subject: [PATCH] Fix #3191 which was due to a typo when calling atan2 during
 polar coordinate conversion.

---
 rtengine/coord.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rtengine/coord.cc b/rtengine/coord.cc
index 4b5dcf40b..8a3d7d080 100644
--- a/rtengine/coord.cc
+++ b/rtengine/coord.cc
@@ -41,7 +41,7 @@ PolarCoord& PolarCoord::operator= (const Coord& other)
     const double y = other.y;
 
     radius = rtengine::norm2 (x, y);
-    angle = std::atan2 (x, y) * 180.0 / M_PI;
+    angle = std::atan2 (y, x) * 180.0 / M_PI;
 
     return *this;
 }