X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstem.cc;h=55b2036269b12ddfb95110d1d3709e0cef11c521;hb=1b071315c1d318e46035ec8bc0b73da55a025ae8;hp=74ea4b57fcf0f500e46353139a5b356357bd30c3;hpb=daee8243ff1c66bc714455a2d265ab02f03546ec;p=lilypond.git

diff --git a/lily/stem.cc b/lily/stem.cc
index 74ea4b57fc..55b2036269 100644
--- a/lily/stem.cc
+++ b/lily/stem.cc
@@ -1,200 +1,338 @@
+/*
+  stem.cc -- implement Stem
+
+  source file of the GNU LilyPond music typesetter
+
+  (c) 1996, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+
+  TODO: This is way too hairy
+*/
+
 #include "stem.hh"
-#include "dimen.hh" 
 #include "debug.hh"
 #include "paper-def.hh"
-#include "notehead.hh"
+#include "note-head.hh"
 #include "lookup.hh"
 #include "molecule.hh"
-#include "pcol.hh"
+#include "p-col.hh"
 #include "misc.hh"
+#include "beam.hh"
+#include "rest.hh"
+
+void
+Stem::set_direction (Direction d)
+{
+  if  (!dir_)
+    warning ("Stem direction set already!");
 
-const int STEMLEN=7;
+  dir_ = d;
 
+  /*
+    todo
+  */
+}
 
-Stem::Stem(int c) //, Moment len)
+Stem::Stem ()
 {
-    beams_left = 0;
-    beams_right = 0;
-    minnote = 1000;		// invalid values
-    maxnote = -1000;
-    bot = top = 0;
-    flag = 4;
-    dir =0;
-    staff_center=c;
-    stemlen=0;
-    print_flag=true;
-    stem_xoffset=0;
+  beams_i_drul_[LEFT] = beams_i_drul_[RIGHT] = -1;
+  yextent_drul_[DOWN] = yextent_drul_[UP] = 0;
+  flag_i_ = 2;
+  dir_ = CENTER;
+  beam_l_ = 0;
+}
+
+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++)
+    {
+      int p = head_l_arr_[i]->position_i_;
+      r[BIGGER] = r[BIGGER] >? p;
+      r[SMALLER] = r[SMALLER] <? p;
+    }
+  return r;
 }
 
 void
-Stem::do_print() const
+Stem::do_print () const
 {
 #ifndef NPRINT
-    mtor << "flag "<< flag << " print_flag " << print_flag
-	 << "min,max [" << minnote << ", " << maxnote << "]";
+  DOUT << "flag "<< flag_i_;
+  if (beam_l_)
+    DOUT << "beamed";
 #endif
 }
-void
-Stem::set_stemend(Real se)
-{
 
-    // todo: margins
-    if (!  ((dir > 0 && se >= maxnote) || (se <= minnote && dir <0))  )	
- 	warning("Weird stem size; check for narrow beams",0);
-    
-    top = (dir < 0) ? maxnote           : se;
-    bot = (dir < 0) ? se  : minnote;
-    flag = dir*abs(flag);
+Real
+Stem::stem_length_f () const
+{
+  return yextent_drul_[UP]-yextent_drul_[DOWN] ;
 }
 
-void
-Stem::add(Notehead *n)
+Real
+Stem::stem_begin_f () const
 {
-    assert(status < PRECALCED);
-    
-    if (n->balltype == 1)
-	return;
-    int p = n->position;
-    if (p < minnote)
-	minnote = p;
-    if (p > maxnote)
-	maxnote = p;
-    heads.push(n);
-    n->add_dependency(this);
+  return yextent_drul_[Direction(-dir_)];
 }
 
+Real
+Stem::chord_start_f () const
+{
+  return head_positions()[dir_] * staff_line_leading_f ()/2.0;
+}
 
-int
-Stem::get_default_dir()
+Real
+Stem::stem_end_f () const
 {
-    if (dir)
-	return dir;
-    Real mean = (minnote+maxnote)/2;
-    return (mean > staff_center) ? -1: 1;
+  return yextent_drul_[dir_];
 }
 
 void
-Stem::set_default_dir()
+Stem::set_stemend (Real se)
 {
-    dir = get_default_dir();
+  // todo: margins
+  if (dir_ && dir_ * head_positions()[dir_] >= se*dir_)
+    warning (_ ("weird stem size; check for narrow beams"));
+
+  
+  yextent_drul_[dir_]  =  se;
+  yextent_drul_[Direction(-dir_)] = head_positions()[-dir_];
+}
+
+int
+Stem::type_i () const
+{
+  return head_l_arr_[0]->balltype_i_;
 }
 
 void
-Stem::set_default_stemlen()
-{
-    if (!dir)
-	set_default_dir();
-
-    int stafftop = 2*staff_center;
-    stemlen = STEMLEN  + (maxnote - minnote);
-    
-    // uhh... how about non 5-line staffs?
-    if (maxnote < -2 && dir == 1){
-	int t = staff_center - staff_center/2; 
-	stemlen = t - minnote +2;
-    } else if (minnote > stafftop + 2 && dir == -1) {
-	int t = staff_center + staff_center/2;
-	stemlen = maxnote -t +2;
+Stem::add_head (Rhythmic_head *n)
+{
+  n->add_dependency (this);	// ?
+  if (Note_head *nh = dynamic_cast<Note_head *> (n))
+    {
+      head_l_arr_.push (nh);
     }
+  else if (Rest *r = dynamic_cast<Rest *> (n))
+    {
+      rest_l_arr_.push (r);
+    }
+}
+
+bool
+Stem::invisible_b () const
+{
+  return (!head_l_arr_.size () ||
+    head_l_arr_[0]->balltype_i_ <= 0);
+}
+
+int
+Stem::get_center_distance (Direction d) const
+{
+  int staff_center = 0;
+  int distance = d*(head_positions()[d] - staff_center);
+  return distance >? 0;
+}
+
+Direction
+Stem::get_default_dir () const
+{
+  return (get_center_distance (UP) >
+	  get_center_distance (DOWN)) 
+    ? DOWN 
+    : UP;
+}
 
-    assert(stemlen);
+Direction
+Stem::get_dir () const
+{
+  return dir_;
 }
 
 
 void
-Stem::set_default_extents()
+Stem::set_default_stemlen ()
 {
-    if (minnote > maxnote) {
-	warning("Empty stem. Ugh!", 0);
-	minnote = -10;
-	maxnote = 20;
-    }
+  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;
+
+  if (!dir_)
+    dir_ = get_default_dir ();
+
+  /* 
+    stems in unnatural (forced) direction should be shortened, 
+    according to [Roush & Gourlay]
+   */
+  if (((int)chord_start_f ())
+      && (dir_ != get_default_dir ()))
+    length_f -= shorten_f;
 
-    if (!stemlen)
-	set_default_stemlen();
+  if (flag_i_ >= 5)
+    length_f += 2.0;
+  if (flag_i_ >= 6)
+    length_f += 1.0;
+  
+  set_stemend ((dir_ > 0) ? head_positions()[BIGGER] + length_f:
+	       head_positions()[SMALLER] - length_f);
 
-    set_stemend((dir< 0) ? maxnote-stemlen: minnote +stemlen);
-    if (dir > 0){	
-	stem_xoffset = paper()->note_width()-paper()->rule_thickness();
-    } else
-	stem_xoffset = 0;
+  if (dir_ * stem_end_f () < 0)
+    set_stemend (0);
 }
 
+//xxx
 void
-Stem::set_noteheads()
-{
-    if(!heads.size())
-	return;
-    heads.sort(Notehead::compare);
-    heads[0]->extremal = -1;
-    heads.top()->extremal = 1;
-    int parity=1;
-    int lastpos = heads[0]->position;
-    for (int i=1; i < heads.size(); i ++) {
-	int dy =abs(lastpos- heads[i]->position);
-	
-	if (dy <= 1) {
-	    if (parity)
-		heads[i]->x_dir = (stem_xoffset>0) ? 1:-1;
-	    parity = !parity;
-	} else
-	    parity = 0;
-	lastpos = heads[i]->position;
+Stem::set_default_extents ()
+{
+  if (!stem_length_f ())
+    set_default_stemlen ();
+
+}
+
+void
+Stem::set_noteheads ()
+{
+  if (!head_l_arr_.size ())
+    return;
+  head_l_arr_.sort (Note_head::compare);
+  if (dir_ < 0)
+    head_l_arr_.reverse ();
+
+  Note_head * beginhead =   head_l_arr_[0];
+  beginhead->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
+  if  (beginhead !=   head_l_arr_.top ())
+    head_l_arr_.top ()->set_elt_property (extremal_scm_sym, SCM_BOOL_T);
+  
+  int parity=1;
+  int lastpos = beginhead->position_i_;
+  for (int i=1; i < head_l_arr_.size (); i ++)
+    {
+      int dy =abs (lastpos- head_l_arr_[i]->position_i_);
+
+      if (dy <= 1)
+	{
+	  if (parity)
+	    head_l_arr_[i]->flip_around_stem (dir_);
+	  parity = !parity;
+	}
+      else
+	parity = 1;
+      lastpos = head_l_arr_[i]->position_i_;
     }
 }
 
 void
-Stem::do_pre_processing()
+Stem::do_pre_processing ()
 {
-    if (bot == top)
-	set_default_extents();
-    set_noteheads();
+  if (yextent_drul_[DOWN]== yextent_drul_[UP])
+    set_default_extents ();
+  set_noteheads ();
+
+  if (invisible_b ())
+    {
+      set_elt_property (transparent_scm_sym, SCM_BOOL_T);
+    }
+  set_empty (invisible_b ());
 }
 
 
 Interval
-Stem::width()const
+Stem::do_width () const
 {
-    if (!print_flag || abs(flag) <= 4)
-	return Interval(0,0);	// TODO!
-    Paper_def*p= paper();
-    Interval r(p->lookup_p_->flag(flag).dim.x);
-    r+= stem_xoffset;
-    return r;
+  Interval r (0, 0);
+  if (beam_l_ || abs (flag_i_) <= 2)
+    ;	// TODO!
+  else
+    {
+      r = lookup_l ()->flag (flag_i_, dir_).dim_.x ();
+      r += note_delta_f ();
+    }
+  return r;
 }
 
+
+
+
+const Real ANGLE = 20* (2.0*M_PI/360.0); // ugh!
+
 Molecule*
-Stem::brew_molecule_p()const return out;
-{
-    assert(bot!=top);
- 
-    
-    Paper_def *p =paper();
-
-    Real dy = p->internote();
-    Symbol ss =p->lookup_p_->stem(bot*dy,top*dy);
-
-    
-    out = new Molecule(Atom(ss));
-
-    if (print_flag&&abs(flag) > 4){
-	Symbol fl = p->lookup_p_->flag(flag);
-	Molecule m(fl);
-	if (flag < -4){		
-	    out->add_bottom(m);
-	} else if (flag > 4) {
-	    out->add_top(m);
-	} else
-	    assert(false); 
+Stem::do_brew_molecule_p () const
+{
+  Molecule *mol_p =new Molecule;
+  Drul_array<Real> stem_y = yextent_drul_;
+  Real dy = staff_line_leading_f ()/2.0;
+
+  Real head_wid = 0;
+  if (head_l_arr_.size ())
+    head_wid = head_l_arr_[0]->extent (X_AXIS).length ();
+  stem_y[Direction(-dir_)] += dir_ * head_wid * tan(ANGLE)/(2*dy);
+  
+  if (!invisible_b ())
+    {
+      Molecule ss =lookup_l ()->stem (stem_y[DOWN]*dy,
+				     stem_y[UP]*dy);
+      mol_p->add_molecule (ss);
+    }
+
+  if (!beam_l_ && abs (flag_i_) > 2)
+    {
+      Molecule fl = lookup_l ()->flag (flag_i_, dir_);
+      fl.translate_axis(stem_y[dir_]*dy, Y_AXIS);
+      mol_p->add_molecule (fl);
     }
 
-    out->translate(Offset(stem_xoffset,0));
+  if (head_l_arr_.size())
+    {
+      mol_p->translate_axis (note_delta_f (), X_AXIS);
+    }
+  return mol_p;
 }
 
 Real
-Stem::hindex()const
+Stem::note_delta_f () const
 {
-    return pcol_l_->hpos + stem_xoffset; // hmm.  + offset_.x;
+  Real r=0;
+  if (head_l_arr_.size())
+    {
+      Interval head_wid(0,  head_l_arr_[0]->extent (X_AXIS).length ());
+      Real rule_thick(paper_l ()->rule_thickness ());
+      Interval stem_wid(-rule_thick/2, rule_thick/2);
+      if (dir_ == CENTER)
+	r = head_wid.center ();
+      else
+	r = head_wid[dir_] - stem_wid[dir_];
+    }
+  return r;
 }
 
+Real
+Stem::hpos_f () const
+{
+  return note_delta_f () + Item::hpos_f ();
+}
 
+void
+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);
+    }
+  Staff_symbol_referencer::do_substitute_element_pointer (o,n);
+}