release: 1.1.36

[lilypond.git] / lily / stem.cc

diff --git a/lily/stem.cc b/lily/stem.cc
index 90a12ae5555f998fca08951f9aebcd5ed44df793..c0221c73fde68c47ae737f5d1be8a7becaa79a4f 100644 (file)
--- a/lily/stem.cc
+++ b/lily/stem.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1996, 1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1996, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 
   TODO: This is way too hairy
 */
@@ -19,28 +19,19 @@
 #include "beam.hh"
 #include "rest.hh"
 
-
-
-
 Stem::~Stem ()
 {
 }
 
 Stem::Stem ()
 {
-  /*
-    TODO: staff-size
-    */
   beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1;
   mult_i_ = 0;
 
   yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
   flag_i_ = 2;
   dir_ = CENTER;
-  beam_dir_ = CENTER;
-  dir_forced_b_ = false;
   stem_xdir_ = LEFT;
-  staff_size_i_ = 8;
 
   beam_gap_i_ = 0;
   beam_l_ = 0;
@@ -49,6 +40,16 @@ Stem::Stem ()
 Interval_t<int>
 Stem::head_positions () const
 {
+  /* 
+    Mysterious FreeBSD fix by John Galbraith.  Somehow, the empty intervals 
+    trigger FP exceptions on FreeBSD.  Fix: do not return infinity 
+
+   */
+  if (!head_l_arr_.size ())
+    {
+      return Interval_t<int> (100,-100);       
+    }
+
   Interval_t<int> r;
   for (int i =0; i < head_l_arr_.size (); i++)
     {
@@ -84,7 +85,7 @@ Stem::stem_begin_f () const
 Real
 Stem::chord_start_f () const
 {
-  return head_positions()[dir_] * paper ()->internote_f ();
+  return head_positions()[dir_] * staff_line_leading_f ()/2.0;
 }
 
 Real
@@ -115,13 +116,13 @@ void
 Stem::add_head (Rhythmic_head *n)
 {
   n->add_dependency (this);    // ?
-  if (dynamic_cast<Note_head *> (n))
+  if (Note_head *nh = dynamic_cast<Note_head *> (n))
     {
-      head_l_arr_.push ((Note_head*)n);
+      head_l_arr_.push (nh);
     }
-  else if (dynamic_cast<Rest *> (n))
+  else if (Rest *r = dynamic_cast<Rest *> (n))
     {
-      rest_l_arr_.push ((Rest*)n);
+      rest_l_arr_.push (r);
     }
 }
 
@@ -164,41 +165,32 @@ Stem::set_default_dir ()
 void
 Stem::set_default_stemlen ()
 {
-  /*
-   TODO
-   urg; this should be handled by Stem_info
-   */
-
-  Real length_f = paper ()->get_var ("stem_length");
-  Real shorten_f = paper ()->get_var ("forced_stem_shorten");
+  Real internote_f = staff_line_leading_f ()/2.0;
+  Real length_f = paper_l ()->get_var ("stem_length0") / internote_f;
+  Real shorten_f = paper_l ()->get_var ("forced_stem_shorten0") / internote_f;
 
-  Real internote_f = paper ()->internote_f ();
-  length_f /= internote_f;
-  shorten_f /= internote_f;
-
-  Real len = length_f;
   if (!dir_)
     set_default_dir ();
   /* 
     stems in unnatural (forced) direction should be shortened, 
     accoding to [Roush & Gourlay]
    */
-  else if (dir_ != get_default_dir ())
-    len -= shorten_f / internote_f;
+  if (((int)chord_start_f ())
+      && (dir_ != get_default_dir ()))
+    length_f -= shorten_f;
 
   if (flag_i_ >= 5)
-    len += 2.0;
+    length_f += 2.0;
   if (flag_i_ >= 6)
-    len += 1.0;
+    length_f += 1.0;
   
-  set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + len :
-              head_positions()[SMALLER] - len);
+  set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + length_f:
+              head_positions()[SMALLER] - length_f);
 
   if (dir_ * stem_end_f () < 0)
-    {
-      set_stemend (0);
-    }
+    set_stemend (0);
 }
+
 //xxx
 void
 Stem::set_default_extents ()
@@ -255,7 +247,10 @@ Stem::do_pre_processing ()
     set_default_extents ();
   set_noteheads ();
   flag_i_ = flag_i_;
-  transparent_b_ = invisible_b ();
+  if (invisible_b ())
+    {
+      set_elt_property (transparent_scm_sym, SCM_BOOL_T);
+    }
   set_empty (invisible_b ());
 }
 
@@ -284,7 +279,7 @@ Stem::do_brew_molecule_p () const
 {
   Molecule *mol_p =new Molecule;
   Drul_array<Real> stem_y = yextent_drul_;
-  Real dy = paper ()->internote_f ();
+  Real dy = staff_line_leading_f ()/2.0;
 
   Real head_wid = 0;
   if (head_l_arr_.size ())
@@ -293,16 +288,16 @@ Stem::do_brew_molecule_p () const
   
   if (!invisible_b ())
     {
-      Atom ss =lookup_l ()->stem (stem_y[DOWN]*dy,
+      Molecule ss =lookup_l ()->stem (stem_y[DOWN]*dy,
                                     stem_y[UP]*dy);
-      mol_p->add_atom (ss);
+      mol_p->add_molecule (ss);
     }
 
   if (!beam_l_ && abs (flag_i_) > 2)
     {
-      Atom fl = lookup_l ()->flag (flag_i_, dir_);
+      Molecule fl = lookup_l ()->flag (flag_i_, dir_);
       fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
-      mol_p->add_atom (fl);
+      mol_p->add_molecule (fl);
     }
 
   if (head_l_arr_.size())
@@ -319,7 +314,7 @@ Stem::note_delta_f () const
   if (head_l_arr_.size())
     {
       Interval head_wid(0,  head_l_arr_[0]->extent (X_AXIS).length ());
-      Real rule_thick(paper ()->rule_thickness ());
+      Real rule_thick(paper_l ()->rule_thickness ());
       Interval stem_wid(-rule_thick/2, rule_thick/2);
       if (stem_xdir_ == CENTER)
        r = head_wid.center ();
@@ -336,13 +331,28 @@ Stem::hpos_f () const
 }
 
 /*
-  TODO:  head_l_arr_/rest_l_arr_ in  do_substitute_dependent ()
+  TODO:  head_l_arr_/rest_l_arr_ in  
  */
 void
-Stem::do_substitute_dependency (Score_element*o,Score_element*n)
+Stem::do_substitute_element_pointer (Score_element*o,Score_element*n)
 {
   if (Note_head*h=dynamic_cast<Note_head*> (o))
   head_l_arr_.substitute (h, dynamic_cast<Note_head*>(n));
   if (Rest *r=dynamic_cast<Rest*> (o))
     rest_l_arr_.substitute (r, dynamic_cast<Rest*>(n));
+  if (Beam* b = dynamic_cast<Beam*> (o))
+    {
+      if (b == beam_l_) 
+       {
+         beam_l_ = dynamic_cast<Beam*> (n);
+         if (!beam_l_)
+           {
+             beams_i_drul_[LEFT] = 0;
+             beams_i_drul_[RIGHT] = 0;
+             mult_i_ = 0;
+           }
+       }
+    }
+  Staff_symbol_referencer::do_substitute_element_pointer (o,n);
+      
 }