X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fbeam-concave.cc;h=e703f9e9f796c62a837fe36843584c32fe70c461;hb=7802d89e1fbb1310b2801502293ece228b5dda66;hp=ee351d0a26739d2fba275b4615cd108b3bfad33b;hpb=d8082113a0df616e7beabc0417c3590a3fac7320;p=lilypond.git

diff --git a/lily/beam-concave.cc b/lily/beam-concave.cc
index ee351d0a26..e703f9e9f7 100644
--- a/lily/beam-concave.cc
+++ b/lily/beam-concave.cc
@@ -23,7 +23,7 @@ is_concave_single_notes (vector<int> const &positions, Direction beam_dir)
   /*
     notes above and below the interval covered by 1st and last note.
   */
-  for (vsize i = 1; i < positions.size () - 1; i++)
+  for (vsize i = 1; i + 1 < positions.size (); i++)
     {
       above = above || (positions[i] > covering[UP]);
       below = below || (positions[i] < covering[DOWN]);
@@ -36,7 +36,7 @@ is_concave_single_notes (vector<int> const &positions, Direction beam_dir)
   */
   int dy = positions.back () - positions[0];
   int closest = max (beam_dir * positions.back (), beam_dir * positions[0]);
-  for (vsize i = 2; !concave && i < positions.size () - 1; i++)
+  for (vsize i = 2; !concave && i + 1 < positions.size (); i++)
     {
       int inner_dy = positions[i] - positions[i - 1];
       if (sign (inner_dy) != sign (dy)
@@ -46,7 +46,7 @@ is_concave_single_notes (vector<int> const &positions, Direction beam_dir)
     }
 
   bool all_closer = true;
-  for (vsize i = 1; all_closer && i < positions.size () - 1; i++)
+  for (vsize i = 1; all_closer && i + 1 < positions.size (); i++)
     {
       all_closer = all_closer
 	&& (beam_dir * positions[i] > closest);
@@ -62,7 +62,7 @@ calc_positions_concaveness (vector<int> const &positions, Direction beam_dir)
   Real dy = positions.back () - positions[0];
   Real slope = dy / Real (positions.size () - 1);
   Real concaveness = 0.0;
-  for (vsize i = 1; i < positions.size () - 1; i++)
+  for (vsize i = 1; i + 1 < positions.size (); i++)
     {
       Real line_y = slope * i + positions[0];
 
@@ -96,17 +96,17 @@ Beam::calc_concaveness (SCM smob)
   Direction beam_dir = CENTER;
   for (vsize i = stems.size (); i--;)
     {
-      if (Stem::is_invisible (stems[i]))
-	stems.erase (stems.begin () + i);
-      else
+      if (Stem::is_normal_stem (stems[i]))
 	{
 	  if (Direction dir = get_grob_direction (stems[i]))
 	    beam_dir = dir;
 	}
+      else
+	stems.erase (stems.begin () + i);
     }
 
   if (stems.size () <= 2)
-    return SCM_UNSPECIFIED;
+    return scm_from_int (0);
 
   vector<int> close_positions;
   vector<int> far_positions;