X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fmelody-spanner.cc;h=2dbcd56cabc5eba65d7d1a389ff39ffc2a9b9127;hb=4bfe4d8c7247fe6c3271d65e6f023ba90a28cf46;hp=d5cb6007ffedc382faa8d4694f9c095e2e0ff314;hpb=7600f31342bd7b7f7b1a3d56cd6ed61dc0ebdda4;p=lilypond.git

diff --git a/lily/melody-spanner.cc b/lily/melody-spanner.cc
index d5cb6007ff..2dbcd56cab 100644
--- a/lily/melody-spanner.cc
+++ b/lily/melody-spanner.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
 */
 
@@ -20,31 +20,33 @@
 /*
   Interpolate stem directions for neutral stems.
  */
-MAKE_SCHEME_CALLBACK(Melody_spanner,calc_neutral_stem_direction, 1);
+MAKE_SCHEME_CALLBACK (Melody_spanner, calc_neutral_stem_direction, 1);
 SCM
 Melody_spanner::calc_neutral_stem_direction (SCM smob)
 {
   Grob *stem = unsmob_grob (smob);
   Grob *me =  unsmob_grob (stem->get_object ("melody-spanner"));
-
+  if (!me || !me->is_live ())
+    return scm_from_int (DOWN);
+  
   extract_grob_set (me, "stems", stems);
 
-  Array<Direction> dirs;
-  for (int i = 0; i < stems.size (); i++)
-    {
-      dirs.push (to_dir (stems[i]->get_property ("default-direction")));
-    }
+  vector<Direction> dirs;
+  for (vsize i = 0; i < stems.size (); i++)
+    dirs.push_back (to_dir (stems[i]->get_property ("default-direction")));
 
-  int last_nonneutral = -1;
-  int next_nonneutral = 0;
-  while (next_nonneutral < dirs.size() &&  !dirs[next_nonneutral])
-    next_nonneutral ++;
+  vsize last_nonneutral = VPOS;
+  vsize next_nonneutral = 0;
+  while (next_nonneutral != VPOS && next_nonneutral < dirs.size ()
+	 &&  !dirs[next_nonneutral])
+    next_nonneutral++;
 
-  while (last_nonneutral < dirs.size () - 1) 
+  SCM retval = SCM_EOL;
+  while (last_nonneutral == VPOS || last_nonneutral + 1 < dirs.size ()) 
     {
       Direction d1 = CENTER;
       Direction d2 = CENTER;
-      if (last_nonneutral >= 0)
+      if (last_nonneutral != VPOS)
 	d1 = dirs[last_nonneutral];
       if (next_nonneutral < dirs.size ())
 	d2 = dirs[next_nonneutral];
@@ -59,24 +61,27 @@ Melody_spanner::calc_neutral_stem_direction (SCM smob)
       else
 	total = to_dir (me->get_property ("neutral-direction"));
       
-      for (int i = last_nonneutral + 1; i <  next_nonneutral; i++)
-	stems[i]->set_property ("neutral-direction", scm_from_int (total));
-
+      for (vsize i = last_nonneutral + 1; i <  next_nonneutral; i++)
+	{
+	  if (stems[i] == stem)
+	    retval = scm_from_int (total);
+	  else
+	    stems[i]->set_property ("neutral-direction", scm_from_int (total));
+	}
 
       last_nonneutral = next_nonneutral;
       while (last_nonneutral < dirs.size ()
 	     && dirs[last_nonneutral])
-	last_nonneutral ++;
+	last_nonneutral++;
       next_nonneutral = last_nonneutral;
-      last_nonneutral --;
+      last_nonneutral--;
 
       while (next_nonneutral < dirs.size ()
 	     && !dirs[next_nonneutral])
-	next_nonneutral ++;
+	next_nonneutral++;
     }
 
-  me->suicide ();
-  return SCM_UNSPECIFIED;
+  return retval;
 }
 
 void
@@ -87,10 +92,12 @@ Melody_spanner::add_stem (Grob *me, Grob *stem)
   stem->set_property ("neutral-direction", Melody_spanner::calc_neutral_stem_direction_proc);
 }
 
-ADD_INTERFACE (Melody_spanner, "melody-spanner-interface",
+ADD_INTERFACE (Melody_spanner,
 	       "Context dependent typesetting decisions.",
 
+	       /* properties */
 	       "stems "
-	       "neutral-direction ");
+	       "neutral-direction "
+	       );