Doc: ensure all level 3 and 4 headings have nodes (2967)

[lilypond.git] / lily / box.cc

diff --git a/lily/box.cc b/lily/box.cc
index 6b12eba7007ba41bd9d29c2e9700aac2cd5b5059..52af33a142362dc26bcf3f9c94727d7e930d1f3c 100644 (file)
--- a/lily/box.cc
+++ b/lily/box.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1996--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1996--2012 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
@@ -33,6 +33,13 @@ Box::unite (Box b)
     interval_a_[i].unite (b[i]);
 }
 
+Real
+Box::area () const
+{
+  return interval_a_[X_AXIS].length ()
+         * interval_a_[Y_AXIS].length ();
+}
+
 Box::Box ()
 {
 }