X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=flower%2Foffset.cc;h=7cb267748190bf372c91a4ae08c122df676144a0;hb=f31fa9710b9d7e7ba1fb3c272e19c2bd5c78eb0c;hp=67b97865e55ebe5f723fd2f717616257b72f9d48;hpb=0387f04497978e37b335a8b99eec905499d6ad0f;p=lilypond.git

diff --git a/flower/offset.cc b/flower/offset.cc
index 67b97865e5..7cb2677481 100644
--- a/flower/offset.cc
+++ b/flower/offset.cc
@@ -1,9 +1,20 @@
 /*
-  offset.cc -- implement Offset
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 1997--2008 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
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "offset.hh"
@@ -14,7 +25,7 @@ Offset::to_string () const
 {
   string s;
   s = string (" (") + ::to_string (coordinate_a_[X_AXIS]) + ", "
-    + ::to_string (coordinate_a_[Y_AXIS]) + ")";
+      + ::to_string (coordinate_a_[Y_AXIS]) + ")";
   return s;
 }
 #endif
@@ -79,24 +90,34 @@ 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
 Offset::is_sane () const
 {
   return !isnan (coordinate_a_[X_AXIS])
-    && !isnan (coordinate_a_ [Y_AXIS])
-    && !isinf (coordinate_a_[X_AXIS]) 
-    && !isinf (coordinate_a_[Y_AXIS]);
+         && !isnan (coordinate_a_ [Y_AXIS])
+         && !isinf (coordinate_a_[X_AXIS])
+         && !isinf (coordinate_a_[Y_AXIS]);
 }
 
 Offset
 Offset::direction () const
 {
   Offset d = *this;
-  d /= length (); 
+  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;
 }