X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fsemi-tie-column.cc;h=f31e23050a1baef803339a827440d473fda9abdb;hb=eaa41b4e4dc1d3b893c5a75711f26db6a7f5fa18;hp=70d431f10591237996c81dd50bdac51b8824dae2;hpb=cbb205d40a19c0d2d9801031a63607e108a18038;p=lilypond.git

diff --git a/lily/semi-tie-column.cc b/lily/semi-tie-column.cc
index 70d431f105..f31e23050a 100644
--- a/lily/semi-tie-column.cc
+++ b/lily/semi-tie-column.cc
@@ -1,10 +1,21 @@
 /*
-  semi-tie-column.cc -- implement Semi_tie_column
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 2005--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 2005--2007 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 "semi-tie-column.hh"
@@ -21,7 +32,7 @@
 
 
 ADD_INTERFACE (Semi_tie_column,
-	      "The interface for a column of l.v. ties.",
+	      "The interface for a column of l.v. (laissez vibrer) ties.",
 
 	      /* properties */
 	      "positioning-done "
@@ -72,4 +83,23 @@ Semi_tie_column::calc_positioning_done (SCM smob)
   return SCM_BOOL_T;
 }
   
+MAKE_SCHEME_CALLBACK (Semi_tie_column, calc_head_direction, 1);
+SCM
+Semi_tie_column::calc_head_direction (SCM smob)
+{
+  Grob *me = unsmob_grob (smob);
 
+  extract_grob_set (me, "ties", ties);
+  Direction d = LEFT;
+  for (vsize i = 0; i < ties.size (); i++)
+    {
+      Direction this_d = to_dir (ties[i]->get_property ("head-direction"));
+      if (i > 0 && d != this_d)
+	{
+	  programming_error ("all semi-ties in a semi-tie-column should have the same head-direction");
+	  return scm_from_int (d);
+	}
+      d = this_d;
+    }
+  return scm_from_int (d);
+}