X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstaff-symbol.cc;h=599ab6eccaf3833987e384d8eecbaf715dd69187;hb=baac78132b2dc92516934b3c9e35dbfa575dec84;hp=a6ab40d9093fcc1f58d4120be8a2f92da0a12783;hpb=570d70e5094bbc73de291d1016394ef70b1d96fb;p=lilypond.git

diff --git a/lily/staff-symbol.cc b/lily/staff-symbol.cc
index a6ab40d909..599ab6ecca 100644
--- a/lily/staff-symbol.cc
+++ b/lily/staff-symbol.cc
@@ -1,9 +1,20 @@
 /*
-  staff-symbol.cc -- implement Staff_symbol
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 1997--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 "staff-symbol.hh"
@@ -167,17 +178,43 @@ Staff_symbol::height  (SCM smob)
   return ly_interval2scm (y_ext);
 }
 
+bool
+Staff_symbol::on_line (Grob *me, int pos)
+{
+  SCM line_positions = me->get_property ("line-positions");
+  if (scm_is_pair (line_positions))
+    {
+      Real min_line = HUGE_VAL;
+      Real max_line = -HUGE_VAL;
+      for (SCM s = line_positions; scm_is_pair (s); s = scm_cdr (s))
+	{
+	  Real current_line = scm_to_double (scm_car (s));
+	  if (pos == current_line)
+	    return true;
+	  if (current_line > max_line)
+	    max_line = current_line;
+	  if (current_line < min_line)
+	    min_line = current_line;
+	
+	}
+      if (pos < min_line)
+	return (( (int) (rint (pos - min_line)) % 2) == 0);
+      if (pos > max_line)
+	return (( (int) (rint (pos - max_line)) % 2) == 0);
 
-
+      return false;
+    }
+  else
+    return ((abs (pos + line_count (me)) % 2) == 1);
+}
 
 ADD_INTERFACE (Staff_symbol,
-	       "This spanner draws the lines of a staff. "
-	       "A staff symbol definines a vertical unit, the staff space. "
-	       "Quantities that go by a half staff space are called positions "
-	       "The center (i.e. middle line "
-	       "or space) is position 0. The length of the symbol may be set by hand "
-	       "through the @code{width} property. ",
-
+	       "This spanner draws the lines of a staff.  A staff symbol"
+	       " defines a vertical unit, the @emph{staff space}.  Quantities"
+	       " that go by a half staff space are called @emph{positions}."
+	       "  The center (i.e., middle line or space) is position@tie{}0."
+	       " The length of the symbol may be set by hand through the"
+	       " @code{width} property.",
 
 	       /* properties */
 	       "ledger-line-thickness "