X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=flower%2Foffset.cc;h=7cb267748190bf372c91a4ae08c122df676144a0;hb=3af0951f9a11677240efa6228683dd4fcea13eaf;hp=180f8acc61c102d0e8f5bee99bc82b0e8bc86c32;hpb=652ed35a2013489d0a14fede6307cd2595abb2c4;p=lilypond.git

diff --git a/flower/offset.cc b/flower/offset.cc
index 180f8acc61..7cb2677481 100644
--- a/flower/offset.cc
+++ b/flower/offset.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -90,8 +90,7 @@ Offset::angle_degrees () const
 Real
 Offset::length () const
 {
-  return sqrt (sqr (coordinate_a_[X_AXIS])
-               + sqr (coordinate_a_[Y_AXIS]));
+  return hypot (coordinate_a_[X_AXIS], coordinate_a_[Y_AXIS]);
 }
 
 bool
@@ -107,6 +106,17 @@ Offset
 Offset::direction () const
 {
   Offset d = *this;
+  if (isinf (d[X_AXIS]))
+    {
+      if (!isinf (d[Y_AXIS]))
+        return Offset ((d[X_AXIS] > 0.0 ? 1.0 : -1.0), 0.0);
+    }
+  else if (isinf (d[Y_AXIS]))
+    return Offset (0.0, (d[Y_AXIS] > 0.0 ? 1.0 : -1.0));
+  else if (d[X_AXIS] == 0.0 && d[Y_AXIS] == 0.0)
+    return d;
+  // The other cases propagate or produce NaN as appropriate.
+
   d /= length ();
   return d;
 }