* lily/include/scm-hash.hh (class Scheme_hash_table): idem.

[lilypond.git] / lily / stem.cc

diff --git a/lily/stem.cc b/lily/stem.cc
index c9deff1dc9c019a8e72b2ea6cbb7e3fa7ce2c7d8..ce268868663a9d1ce443bc432d65fed81c50b1d2 100644 (file)
--- a/lily/stem.cc
+++ b/lily/stem.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
 
   source file of the GNU LilyPond music typesetter
 

-  (c) 1996--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1996--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>

     Jan Nieuwenhuizen <janneke@gnu.org>
 
   TODO: This is way too hairy
     Jan Nieuwenhuizen <janneke@gnu.org>
 
   TODO: This is way too hairy


@@ -33,6 +33,7 @@
 #include "spanner.hh"
 #include "side-position-interface.hh"
 #include "dot-column.hh"
 #include "spanner.hh"
 #include "side-position-interface.hh"
 #include "dot-column.hh"

+#include "stem-tremolo.hh"

 
 void
 Stem::set_beaming (Grob*me, int beam_count,  Direction d)
 
 void
 Stem::set_beaming (Grob*me, int beam_count,  Direction d)


@@ -96,13 +97,13 @@ Stem::stem_end_position (Grob*me)
 Direction
 Stem::get_direction (Grob*me)
 {
 Direction
 Stem::get_direction (Grob*me)
 {

-  Direction d = Directional_element_interface::get (me);
+  Direction d = get_grob_direction (me);

 
   if (!d)
     {
        d = get_default_dir (me);
        // urg, AAARGH!
 
   if (!d)
     {
        d = get_default_dir (me);
        // urg, AAARGH!

-       Directional_element_interface::set (me, d);
+       set_grob_direction (me, d);

     }
   return d ;
 }
     }
   return d ;
 }


@@ -129,11 +130,7 @@ Stem::set_stemend (Grob*me, Real se)
 Grob*
 Stem::support_head (Grob*me)
 {
 Grob*
 Stem::support_head (Grob*me)
 {

-  SCM h = me->get_grob_property ("support-head");
-  Grob * nh = unsmob_grob (h);
-  if (nh)
-    return nh;
-  else if (head_count (me) == 1)
+  if (head_count (me) == 1)

     {
       /*
        UGH.
     {
       /*
        UGH.


@@ -229,7 +226,7 @@ Stem::note_head_positions (Grob *me)
 
       ps.push (p);
     }
 
       ps.push (p);
     }

-
+  

   ps.sort (icmp);
   return ps; 
 }
   ps.sort (icmp);
   return ps; 
 }


@@ -241,6 +238,9 @@ Stem::add_head (Grob*me, Grob *n)
   n->set_grob_property ("stem", me->self_scm ());
   n->add_dependency (me);
 
   n->set_grob_property ("stem", me->self_scm ());
   n->add_dependency (me);
 

+  /*
+    TODO: why not store Rest pointers? 
+  */

   if (Note_head::has_interface (n))
     {
       Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-heads"), n);
   if (Note_head::has_interface (n))
     {
       Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-heads"), n);


@@ -259,7 +259,7 @@ Stem::get_default_dir (Grob*me)
 {
   int staff_center = 0;
   Interval hp = head_positions (me);
 {
   int staff_center = 0;
   Interval hp = head_positions (me);

-  if (hp.empty_b())
+  if (hp.is_empty ())

     {
       return CENTER;
     }
     {
       return CENTER;
     }


@@ -276,45 +276,30 @@ Stem::get_default_dir (Grob*me)
 Real
 Stem::get_default_stem_end_position (Grob*me) 
 {
 Real
 Stem::get_default_stem_end_position (Grob*me) 
 {

-  /* Tab notation feature: make stem end extend out of staff. */
-  SCM up_to_staff = me->get_grob_property ("up-to-staff");
-  if (to_boolean (up_to_staff))
-    {
-      int line_count = Staff_symbol_referencer::line_count (me);
-      Direction dir = get_direction (me);
-      return dir * (line_count + 3.5);
-    }
-  
-  bool grace_b = to_boolean (me->get_grob_property ("grace"));
+  Real ss = Staff_symbol_referencer::staff_space (me); 
+
+  int durlog = duration_log (me);
+    

   SCM s;
   Array<Real> a;
 
   SCM s;
   Array<Real> a;
 

-  Real length_f = 3.5;
+  
+  Real length = 7;             // WARNING: IN HALF SPACES

   SCM scm_len = me->get_grob_property ("length");
   if (gh_number_p (scm_len))
     {
   SCM scm_len = me->get_grob_property ("length");
   if (gh_number_p (scm_len))
     {

-      length_f = gh_scm2double (scm_len);
+      length = gh_scm2double (scm_len);

     }
   else
     {
       s = me->get_grob_property ("lengths");
       if (gh_pair_p (s))
        {
     }
   else
     {
       s = me->get_grob_property ("lengths");
       if (gh_pair_p (s))
        {

-         length_f = 2* gh_scm2double (robust_list_ref (duration_log(me) -2, s));
+         length = 2* gh_scm2double (robust_list_ref (durlog -2, s));

        }
     }
 
        }
     }
 

-  Real shorten_f = 0.0;
-  
-  SCM sshorten = me->get_grob_property ("stem-shorten");
-  if (gh_pair_p (sshorten))
-    {
-      shorten_f = 2* gh_scm2double (robust_list_ref ((duration_log (me) - 2) >? 0, sshorten));
-    }

 
 

-  /* On boundary: shorten only half */
-  if (abs (chord_start_y (me)) == 0.5)
-    shorten_f *= 0.5;

 
   /* URGURGURG
      'set-default-stemlen' sets direction too
 
   /* URGURGURG
      'set-default-stemlen' sets direction too


@@ -323,24 +308,76 @@ Stem::get_default_stem_end_position (Grob*me)
   if (!dir)
     {
       dir = get_default_dir (me);
   if (!dir)
     {
       dir = get_default_dir (me);

-      Directional_element_interface::set (me, dir);
+      set_grob_direction (me, dir);

     }
     }

-  
+
+

   /* stems in unnatural (forced) direction should be shortened, 
     according to [Roush & Gourlay] */
   /* stems in unnatural (forced) direction should be shortened, 
     according to [Roush & Gourlay] */

-  if (chord_start_y (me)
-      && (get_direction (me) != get_default_dir (me)))
-    length_f -= shorten_f;
+  if (!chord_start_y (me)
+      || (get_direction (me) != get_default_dir (me)))
+    {
+      
+      Real shorten = 0.0;
+  
+      SCM sshorten = me->get_grob_property ("stem-shorten");
+      SCM scm_shorten = gh_pair_p (sshorten) ?
+       robust_list_ref ((duration_log (me) - 2) >? 0, sshorten): SCM_EOL;
+      if (gh_number_p (scm_shorten))
+       {
+         shorten = 2* gh_scm2double (scm_shorten);
+       }
+  
+      /* On boundary: shorten only half */
+      if (abs (head_positions (me)[get_direction (me)]) <= 1)
+       shorten *= 0.5;
+  
+      length -= shorten;
+    }

 
 

-  Interval hp = head_positions (me);  
-  Real st = hp[dir] + dir * length_f;
+  /*
+    Tremolo stuff: 
+  */
+  Grob * trem = unsmob_grob (me->get_grob_property ("tremolo-flag"));
+  if (trem &&  !unsmob_grob (me->get_grob_property ("beam")))
+    {
+      /*
+       Crude hack: add extra space if tremolo flag is there.

 
 

+       We can't do this for the beam, since we get into a loop
+       (Stem_tremolo::raw_molecule() looks at the beam.)
+       
+        --hwn 
+      */
+      
+      Real minlen =
+       1.0 + 2 * Stem_tremolo::raw_molecule (trem).extent (Y_AXIS).length  () / ss;
+      
+      if (durlog >= 3)
+       {
+         Interval flag_ext = flag (me).extent (Y_AXIS) ;
+         if (!flag_ext.is_empty ())
+           minlen += 2 * flag_ext.length () / ss ;
+
+         /*
+           The clash is smaller for down stems (since the tremolo is
+           angled up.)
+          */
+         if (dir == DOWN)
+           minlen -= 1.0;
+       }
+      
+      length = length >? (minlen + 1.0);
+    }
+   
+  Interval hp = head_positions (me);  
+  Real st = hp[dir] + dir * length;

 
   /*
     TODO: change name  to extend-stems to staff/center/'()
   */
   bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));
 
   /*
     TODO: change name  to extend-stems to staff/center/'()
   */
   bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));

-  if (!grace_b && !no_extend_b && dir * st < 0) // junkme?
+  if (!no_extend_b && dir * st < 0) // junkme?

     st = 0.0;
 
   /*
     st = 0.0;
 
   /*


@@ -350,7 +387,7 @@ Stem::get_default_stem_end_position (Grob*me)
     
   */
   if (!get_beam (me) && dir == UP
     
   */
   if (!get_beam (me) && dir == UP

-      && duration_log (me) > 2)
+      && durlog > 2)

     {
       Grob * closest_to_flag = extremal_heads (me)[dir];
       Grob * dots = closest_to_flag
     {
       Grob * closest_to_flag = extremal_heads (me)[dir];
       Grob * dots = closest_to_flag


@@ -360,7 +397,7 @@ Stem::get_default_stem_end_position (Grob*me)
        {
          Real dp = Staff_symbol_referencer::get_position (dots);
          Real flagy =  flag (me).extent (Y_AXIS)[-dir] * 2
        {
          Real dp = Staff_symbol_referencer::get_position (dots);
          Real flagy =  flag (me).extent (Y_AXIS)[-dir] * 2

-           / Staff_symbol_referencer::staff_space (me); 
+           / ss;

 
          /*
            Very gory: add myself to the X-support of the parent,
 
          /*
            Very gory: add myself to the X-support of the parent,


@@ -417,13 +454,9 @@ Stem::position_noteheads (Grob*me)
     heads.reverse ();
 
 
     heads.reverse ();
 
 

-  bool invisible = invisible_b (me);
-  Real thick = 0.0;
-  if (invisible)
-        thick = gh_scm2double (me->get_grob_property ("thickness"))
-         * me->get_paper ()->get_var ("linethickness");
+  Real thick = gh_scm2double (me->get_grob_property ("thickness"))
+     * me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));

       
       

-

   Grob *hed = support_head (me);
   Real w = Note_head::head_extent (hed,X_AXIS)[dir];
   for (int i=0; i < heads.size (); i++)
   Grob *hed = support_head (me);
   Real w = Note_head::head_extent (hed,X_AXIS)[dir];
   for (int i=0; i < heads.size (); i++)


@@ -432,7 +465,7 @@ Stem::position_noteheads (Grob*me)
                                X_AXIS);
     }
   
                                X_AXIS);
     }
   

-  bool parity= true;           // todo: make me settable.
+  bool parity= true;

   int lastpos = int (Staff_symbol_referencer::get_position (heads[0]));
   for (int i=1; i < heads.size (); i ++)
     {
   int lastpos = int (Staff_symbol_referencer::get_position (heads[0]));
   for (int i=1; i < heads.size (); i ++)
     {


@@ -446,10 +479,21 @@ Stem::position_noteheads (Grob*me)
              Real l = Note_head::head_extent (heads[i], X_AXIS).length ();
 
              Direction d = get_direction (me);
              Real l = Note_head::head_extent (heads[i], X_AXIS).length ();
 
              Direction d = get_direction (me);

-             heads[i]->translate_axis (l * d, X_AXIS);
+             /*
+               Reversed head should be shifted l-thickness, but this
+               looks too crowded, so we only shift l-0.5*thickness.
+
+               This leads to assymetry: Normal heads overlap the
+               stem 100% whereas reversed heads only overlaps the
+               stem 50%
+
+             */
+
+             Real reverse_overlap =0.5;
+             heads[i]->translate_axis ((l-thick*reverse_overlap) * d, X_AXIS);

 
              if (invisible_b(me))
 
              if (invisible_b(me))

-               heads[i]->translate_axis (-thick *2* d , X_AXIS);
+               heads[i]->translate_axis (-thick*(2 - reverse_overlap) * d , X_AXIS);

 
              
             /* TODO:
 
              
             /* TODO:


@@ -529,24 +573,26 @@ Stem::height (SCM smob, SCM ax)
 Molecule
 Stem::flag (Grob*me)
 {
 Molecule
 Stem::flag (Grob*me)
 {

-  /* TODO: rename flag-style into something more appropriate,
-   e.g. "stroke-style", maybe with values "" (i.e. no stroke),
-   "single" and "double".  Needs more discussion.
-  */
-  String style, staffline_offs;
-
-  SCM style_scm = me->get_grob_property ("style");
-  if (gh_symbol_p (style_scm))
+  /* TODO: maybe property stroke-style should take different values,
+     e.g. "" (i.e. no stroke), "single" and "double" (currently, it's
+     '() or "grace").  */
+  String flag_style;
+  
+  SCM flag_style_scm = me->get_grob_property ("flag-style");
+  if (gh_symbol_p (flag_style_scm))

     {
     {

-      style = (ly_scm2string (scm_symbol_to_string (style_scm)));
+      flag_style = ly_symbol2string (flag_style_scm);

     }
     }

-  else
+
+  if (flag_style == "no-flag")

     {
     {

-      style = "";
+      return Molecule ();

     }
     }

+

   bool adjust = to_boolean (me->get_grob_property ("adjust-if-on-staffline"));
 
   bool adjust = to_boolean (me->get_grob_property ("adjust-if-on-staffline"));
 

-  if (String::compare (style, "mensural") == 0)
+  String staffline_offs;
+  if (String::compare (flag_style, "mensural") == 0)

     /* Mensural notation: For notes on staff lines, use different
        flags than for notes between staff lines.  The idea is that
        flags are always vertically aligned with the staff lines,
     /* Mensural notation: For notes on staff lines, use different
        flags than for notes between staff lines.  The idea is that
        flags are always vertically aligned with the staff lines,


@@ -572,7 +618,8 @@ Stem::flag (Grob*me)
             flag's shape accordingly.  In the worst case, the shape
             looks slightly misplaced, but that will usually be the
             programmer's fault (e.g. when trying to attach multiple
             flag's shape accordingly.  In the worst case, the shape
             looks slightly misplaced, but that will usually be the
             programmer's fault (e.g. when trying to attach multiple

-            note heads to a single stem in mensural notation).  */
+            note heads to a single stem in mensural notation).
+         */

 
          /*
            perhaps the detection whether this correction is needed should
 
          /*
            perhaps the detection whether this correction is needed should


@@ -593,25 +640,26 @@ Stem::flag (Grob*me)
     {
       staffline_offs = "";
     }
     {
       staffline_offs = "";
     }

+

   char dir = (get_direction (me) == UP) ? 'u' : 'd';
   String font_char =
   char dir = (get_direction (me) == UP) ? 'u' : 'd';
   String font_char =

-    style + to_string (dir) + staffline_offs + to_string (duration_log (me));
+    flag_style + to_string (dir) + staffline_offs + to_string (duration_log (me));

   Font_metric *fm = Font_interface::get_default_font (me);
   Molecule flag = fm->find_by_name ("flags-" + font_char);
   Font_metric *fm = Font_interface::get_default_font (me);
   Molecule flag = fm->find_by_name ("flags-" + font_char);

-  if (flag.empty_b ())
+  if (flag.is_empty ())

     {
       me->warning (_f ("flag `%s' not found", font_char));
     }
 
     {
       me->warning (_f ("flag `%s' not found", font_char));
     }
 

-  SCM stroke_scm = me->get_grob_property ("flag-style");
-  if (gh_string_p (stroke_scm))
+  SCM stroke_style_scm = me->get_grob_property ("stroke-style");
+  if (gh_string_p (stroke_style_scm))

     {
     {

-      String stroke = ly_scm2string (stroke_scm);
-      if (!stroke.empty_b ())
+      String stroke_style = ly_scm2string (stroke_style_scm);
+      if (!stroke_style.is_empty ())

        {
        {

-         String font_char = to_string (dir) + stroke;
+         String font_char = to_string (dir) + stroke_style;

          Molecule stroke = fm->find_by_name ("flags-" + font_char);
          Molecule stroke = fm->find_by_name ("flags-" + font_char);

-         if (stroke.empty_b ())
+         if (stroke.is_empty ())

            {
              me->warning (_f ("flag stroke `%s' not found", font_char));
            }
            {
              me->warning (_f ("flag stroke `%s' not found", font_char));
            }


@@ -631,13 +679,16 @@ Stem::dim_callback (SCM e, SCM ax)
 {
   Axis a = (Axis) gh_scm2int (ax);
   assert (a == X_AXIS);
 {
   Axis a = (Axis) gh_scm2int (ax);
   assert (a == X_AXIS);

-  Grob *se = unsmob_grob (e);
+  Grob *me = unsmob_grob (e);

   Interval r (0, 0);
   Interval r (0, 0);

-  if (unsmob_grob (se->get_grob_property ("beam")) || abs (duration_log (se)) <= 2)
+  if (unsmob_grob (me->get_grob_property ("beam")) || abs (duration_log (me)) <= 2)

     ;  // TODO!
   else
     {
     ;  // TODO!
   else
     {

-      r = flag (se).extent (X_AXIS);
+      r = flag (me).extent (X_AXIS)
+       +
+        gh_scm2double (me->get_grob_property ("thickness"))
+       * me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"))/2;

     }
   return ly_interval2scm (r);
 }
     }
   return ly_interval2scm (r);
 }


@@ -655,38 +706,27 @@ Stem::brew_molecule (SCM smob)
   
   
      
   
   
      

-  Real y1;
-
-  /*
-    This is required to avoid stems passing in tablature chords...
-   */
-
-

   /*
     TODO: make  the stem start a direction ?
   /*
     TODO: make  the stem start a direction ?

+
+    This is required to avoid stems passing in tablature chords...

   */
   */

-  
+  Grob *lh = to_boolean (me->get_grob_property ("avoid-note-head")) 
+    ? last_head (me) :  lh = first_head (me);

 
 

-  
-  if (to_boolean (me->get_grob_property ("avoid-note-head")))
-    {
-      Grob * lh = last_head (me);
-      if (!lh)
-       return SCM_EOL;
-      y1 = Staff_symbol_referencer::get_position (lh);
-    }
-  else
+  if (!lh)
+    return SCM_EOL;
+
+  if (invisible_b (me))

     {
     {

-      Grob * lh = first_head (me);
-      if (!lh)
-       return SCM_EOL;
-      y1 = Staff_symbol_referencer::get_position (lh);
+      return SCM_EOL;

     }
   
     }
   

+  Real y1 = Staff_symbol_referencer::get_position (lh);

   Real y2 = stem_end_position (me);
   
   Interval stem_y (y1 <? y2,y2 >? y1);
   Real y2 = stem_end_position (me);
   
   Interval stem_y (y1 <? y2,y2 >? y1);

-
+ 

 
   // dy?
   Real dy = Staff_symbol_referencer::staff_space (me) * 0.5;
 
   // dy?
   Real dy = Staff_symbol_referencer::staff_space (me) * 0.5;


@@ -697,27 +737,30 @@ Stem::brew_molecule (SCM smob)
        must not take ledgers into account.
        */
       Interval head_height = Note_head::head_extent (hed,Y_AXIS);
        must not take ledgers into account.
        */
       Interval head_height = Note_head::head_extent (hed,Y_AXIS);

-      Real y_attach = Note_head::stem_attachment_coordinate ( hed, Y_AXIS);
+      Real y_attach = Note_head::stem_attachment_coordinate (hed, Y_AXIS);

 
       y_attach = head_height.linear_combination (y_attach);
       stem_y[Direction (-d)] += d * y_attach/dy;
     }
 
       y_attach = head_height.linear_combination (y_attach);
       stem_y[Direction (-d)] += d * y_attach/dy;
     }

+

   
   

-  if (!invisible_b (me))
-    {
-      Real stem_width = gh_scm2double (me->get_grob_property ("thickness"))
-       // URG
-       * me->get_paper ()->get_var ("linethickness");
-      
-      Molecule ss =Lookup::filledbox (Box (Interval (-stem_width/2, stem_width/2),
-                                          Interval (stem_y[DOWN]*dy, stem_y[UP]*dy)));
-      mol.add_molecule (ss);
-    }
+  // URG
+  Real stem_width = gh_scm2double (me->get_grob_property ("thickness"))
+    * me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
+  Real blot = 
+       me->get_paper ()->get_realvar (ly_symbol2scm ("blotdiameter"));
+  
+  Box b = Box (Interval (-stem_width/2, stem_width/2),
+              Interval (stem_y[DOWN]*dy, stem_y[UP]*dy));
+
+  Molecule ss = Lookup::round_filled_box (b, blot);
+  mol.add_molecule (ss);

 
   if (!get_beam (me) && abs (duration_log (me)) > 2)
     {
       Molecule fl = flag (me);
 
   if (!get_beam (me) && abs (duration_log (me)) > 2)
     {
       Molecule fl = flag (me);

-      fl.translate_axis (stem_y[d]*dy, Y_AXIS);
+      fl.translate_axis (stem_y[d]*dy - d * blot/2, Y_AXIS);
+      fl.translate_axis (stem_width/2, X_AXIS);

       mol.add_molecule (fl);
     }
 
       mol.add_molecule (fl);
     }
 


@@ -743,7 +786,6 @@ Stem::off_callback (SCM element_smob, SCM)
   if (Grob * f = first_head (me))
     {
       Interval head_wid = Note_head::head_extent(f, X_AXIS);
   if (Grob * f = first_head (me))
     {
       Interval head_wid = Note_head::head_extent(f, X_AXIS);

-

       
       Real attach =0.0;
 
       
       Real attach =0.0;
 


@@ -767,8 +809,7 @@ Stem::off_callback (SCM element_smob, SCM)
        {
          Real rule_thick
            = gh_scm2double (me->get_grob_property ("thickness"))
        {
          Real rule_thick
            = gh_scm2double (me->get_grob_property ("thickness"))

-           * me->get_paper ()->get_var ("linethickness");
-
+           * me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));

          
          r += - d * rule_thick * 0.5;
        }
          
          r += - d * rule_thick * 0.5;
        }


@@ -776,6 +817,7 @@ Stem::off_callback (SCM element_smob, SCM)
   return gh_double2scm (r);
 }
 
   return gh_double2scm (r);
 }
 

+

 Grob*
 Stem::get_beam (Grob*me)
 {
 Grob*
 Stem::get_beam (Grob*me)
 {


@@ -795,32 +837,20 @@ Stem::get_stem_info (Grob *me)
     }
   
   Stem_info si;
     }
   
   Stem_info si;

-  si.dir_ = Directional_element_interface::get (me); 
+  si.dir_ = get_grob_direction (me); 

   si.ideal_y_ = gh_scm2double (gh_car (scm_info)); 
   si.shortest_y_ = gh_scm2double (gh_cadr (scm_info));
   return si;
 }
 
   si.ideal_y_ = gh_scm2double (gh_car (scm_info)); 
   si.shortest_y_ = gh_scm2double (gh_cadr (scm_info));
   return si;
 }
 

+
+/*
+  TODO: add extra space for tremolos!
+ */

 void
 Stem::calc_stem_info (Grob *me)
 {
 void
 Stem::calc_stem_info (Grob *me)
 {

-  /* Tab notation feature: make stem end extend out of staff. */
-  SCM up_to_staff = me->get_grob_property ("up-to-staff");
-  if (to_boolean (up_to_staff))
-    {
-      int line_count = Staff_symbol_referencer::line_count (me);
-      Direction dir = get_direction (me);
-      Real ideal_y = dir * (line_count + 1.5);
-      Real shortest_y = ideal_y;
-      
-      me->set_grob_property ("stem-info",
-                            scm_list_n (gh_double2scm (ideal_y),
-                                        gh_double2scm (shortest_y),
-                                        SCM_UNDEFINED));
-      return;
-    }
-
-  Direction my_dir = Directional_element_interface::get (me);
+  Direction my_dir = get_grob_direction (me);

   Real staff_space = Staff_symbol_referencer::staff_space (me);
   Grob *beam = get_beam (me);
   Real beam_translation = Beam::get_beam_translation (beam);
   Real staff_space = Staff_symbol_referencer::staff_space (me);
   Grob *beam = get_beam (me);
   Real beam_translation = Beam::get_beam_translation (beam);


@@ -829,20 +859,18 @@ Stem::calc_stem_info (Grob *me)
 
 
   /* Simple standard stem length */
 
 
   /* Simple standard stem length */

+  SCM lengths = me->get_grob_property ("beamed-lengths");

   Real ideal_length =
   Real ideal_length =

-    gh_scm2double (robust_list_ref
-                  (beam_count - 1,
-                   me->get_grob_property ("beamed-lengths")))
+    gh_scm2double (robust_list_ref (beam_count - 1,lengths))
+               

     * staff_space
     /* stem only extends to center of beam */
     - 0.5 * beam_thickness;
     * staff_space
     /* stem only extends to center of beam */
     - 0.5 * beam_thickness;

-

   
   /* Condition: sane minimum free stem length (chord to beams) */
   
   /* Condition: sane minimum free stem length (chord to beams) */

+  lengths = me->get_grob_property ("beamed-minimum-free-lengths");

   Real ideal_minimum_free =
   Real ideal_minimum_free =

-    gh_scm2double (robust_list_ref
-                  (beam_count - 1,
-                   me->get_grob_property ("beamed-minimum-free-lengths")))
+    gh_scm2double (robust_list_ref (beam_count - 1, lengths))

     * staff_space;
   
 
     * staff_space;
   
 


@@ -887,11 +915,9 @@ Stem::calc_stem_info (Grob *me)
      Obviously not for grace beams.
      
      Also, not for knees.  Seems to be a good thing. */
      Obviously not for grace beams.
      
      Also, not for knees.  Seems to be a good thing. */

-  SCM grace = me->get_grob_property ("grace");
-  bool grace_b = to_boolean (grace);

   bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));
   bool knee_b = to_boolean (beam->get_grob_property ("knee"));
   bool no_extend_b = to_boolean (me->get_grob_property ("no-stem-extend"));
   bool knee_b = to_boolean (beam->get_grob_property ("knee"));

-  if (!grace_b && !no_extend_b && !knee_b)
+  if (!no_extend_b && !knee_b)

     {
       /* Highest beam of (UP) beam must never be lower than middle
         staffline */
     {
       /* Highest beam of (UP) beam must never be lower than middle
         staffline */


@@ -906,7 +932,6 @@ Stem::calc_stem_info (Grob *me)
   if (gh_number_p (shorten))
     ideal_y -= gh_scm2double (shorten);
 
   if (gh_number_p (shorten))
     ideal_y -= gh_scm2double (shorten);
 

-

   Real minimum_free =
     gh_scm2double (robust_list_ref
                   (beam_count - 1,
   Real minimum_free =
     gh_scm2double (robust_list_ref
                   (beam_count - 1,


@@ -943,8 +968,17 @@ Stem::beam_multiplicity (Grob *stem)
 }
 
 
 }
 
 

+/*
+  these are too many props.
+ */

 ADD_INTERFACE (Stem,"stem-interface",
 ADD_INTERFACE (Stem,"stem-interface",

-  "A stem",
-  "up-to-staff avoid-note-head adjust-if-on-staffline thickness stem-info beamed-lengths beamed-minimum-free-lengths beamed-extreme-minimum-free-lengths lengths beam stem-shorten duration-log beaming neutral-direction stem-end-position support-head note-heads direction length style no-stem-extend flag-style");
+              "A stem",
+              "tremolo-flag french-beaming "
+              "avoid-note-head adjust-if-on-staffline thickness "
+              "stem-info beamed-lengths beamed-minimum-free-lengths "
+              "beamed-extreme-minimum-free-lengths lengths beam stem-shorten "
+              "duration-log beaming neutral-direction stem-end-position "
+              "note-heads direction length flag-style "
+              "no-stem-extend stroke-style");