lily/tie-engraver.cc

   1 /*
   2   tie-engraver.cc -- implement Tie_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "engraver.hh"
  10
  11 #include "context.hh"
  12 #include "international.hh"
  13 #include "item.hh"
  14 #include "note-head.hh"
  15 #include "protected-scm.hh"
  16 #include "spanner.hh"
  17 #include "staff-symbol-referencer.hh"
  18 #include "stream-event.hh"
  19 #include "tie-column.hh"
  20 #include "tie.hh"
  21 #include "warn.hh"
  22
  23 #include "translator.icc"
  24
  25 /**
  26    Manufacture ties.  Acknowledge noteheads, and put them into a
  27    priority queue. If we have a TieEvent, connect the notes that finish
  28    just at this time, and note that start at this time.
  29
  30    TODO: Remove the dependency on musical info. We should tie on the
  31    basis of position and duration-log of the heads (not of the events).
  32 */
  33
  34 struct Head_event_tuple
  35 {
  36   Grob *head_;
  37   Moment end_moment_;
  38   SCM tie_definition_;
  39   Stream_event *tie_stream_event_;
  40   Stream_event *tie_event_;
  41
  42   Head_event_tuple ()
  43   {
  44     head_ = 0;
  45     tie_definition_ = SCM_EOL;
  46     tie_event_ = 0;
  47     tie_stream_event_ = 0;
  48   }
  49 };
  50
  51 class Tie_engraver : public Engraver
  52 {
  53   Stream_event *event_;
  54   vector<Grob*> now_heads_;
  55   vector<Head_event_tuple> heads_to_tie_;
  56   vector<Grob*> ties_;
  57
  58   Spanner *tie_column_;
  59
  60 protected:
  61   void stop_translation_timestep ();
  62   virtual void derived_mark () const;
  63   void start_translation_timestep ();
  64   DECLARE_ACKNOWLEDGER (note_head);
  65   DECLARE_TRANSLATOR_LISTENER (tie);
  66   void process_music ();
  67   void typeset_tie (Grob *);
  68 public:
  69   TRANSLATOR_DECLARATIONS (Tie_engraver);
  70 };
  71
  72 void
  73 Tie_engraver::derived_mark () const
  74 {
  75   Engraver::derived_mark ();
  76   for (vsize i = 0; i < heads_to_tie_.size (); i++)
  77     scm_gc_mark (heads_to_tie_[i].tie_definition_);
  78 }
  79
  80 Tie_engraver::Tie_engraver ()
  81 {
  82   event_ = 0;
  83   tie_column_ = 0;
  84 }
  85
  86 IMPLEMENT_TRANSLATOR_LISTENER (Tie_engraver, tie);
  87 void
  88 Tie_engraver::listen_tie (Stream_event *ev)
  89 {
  90   ASSIGN_EVENT_ONCE (event_, ev);
  91 }
  92
  93 void
  94 Tie_engraver::process_music ()
  95 {
  96   bool busy = event_;
  97   for (vsize i = 0; !busy && i < heads_to_tie_.size (); i++)
  98     busy |=  (heads_to_tie_[i].tie_event_
  99               || heads_to_tie_[i].tie_stream_event_);
 100
 101   if (busy)
 102     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
 103 }
 104
 105 void
 106 Tie_engraver::acknowledge_note_head (Grob_info i)
 107 {
 108   Grob *h = i.grob ();
 109
 110   now_heads_.push_back (h);
 111   for (vsize i = heads_to_tie_.size (); i--;)
 112     {
 113       Grob *th = heads_to_tie_[i].head_;
 114       Stream_event *right_ev = unsmob_stream_event (h->get_property ("cause"));
 115       Stream_event *left_ev = unsmob_stream_event (th->get_property ("cause"));
 116
 117       /*
 118         maybe should check positions too.
 119       */
 120       if (!right_ev || !left_ev)
 121         continue;
 122
 123       if (ly_is_equal (right_ev->get_property ("pitch"),
 124                        left_ev->get_property ("pitch")))
 125         {
 126           Grob *p = new Spanner (heads_to_tie_[i].tie_definition_);
 127
 128           SCM cause = heads_to_tie_[i].tie_event_
 129             ? heads_to_tie_[i].tie_event_->self_scm ()
 130             : heads_to_tie_[i].tie_stream_event_->self_scm ();
 131
 132           announce_grob (p, cause);
 133           Tie::set_head (p, LEFT, th);
 134           Tie::set_head (p, RIGHT, h);
 135
 136
 137           if (is_direction (unsmob_stream_event (cause)->get_property ("direction")))
 138             {
 139               Direction d = to_dir (unsmob_stream_event (cause)->get_property ("direction"));
 140               p->set_property ("direction", scm_from_int (d));
 141             }
 142
 143           ties_.push_back (p);
 144           heads_to_tie_.erase (heads_to_tie_.begin () + i);
 145         }
 146     }
 147
 148   if (ties_.size () && ! tie_column_)
 149     tie_column_ = make_spanner ("TieColumn", ties_[0]->self_scm ());
 150
 151   if (tie_column_)
 152     for (vsize i = ties_.size (); i--;)
 153       Tie_column::add_tie (tie_column_, ties_[i]);
 154 }
 155
 156 void
 157 Tie_engraver::start_translation_timestep ()
 158 {
 159   context ()->set_property ("tieMelismaBusy",
 160                             ly_bool2scm (heads_to_tie_.size ()));
 161
 162   if (heads_to_tie_.size () && !to_boolean (get_property ("tieWaitForNote")))
 163     {
 164       Moment now = now_mom ();
 165       for (vsize i = heads_to_tie_.size ();  i--; )
 166         {
 167           if (now > heads_to_tie_[i].end_moment_)
 168             heads_to_tie_.erase (heads_to_tie_.begin () + i);
 169         }
 170     }
 171 }
 172
 173 void
 174 Tie_engraver::stop_translation_timestep ()
 175 {
 176   bool wait = to_boolean (get_property ("tieWaitForNote"));
 177   if (ties_.size ())
 178     {
 179       if (!wait)
 180         heads_to_tie_.clear ();
 181
 182       for (vsize i = 0; i < ties_.size (); i++)
 183           typeset_tie (ties_[i]);
 184
 185       ties_.clear ();
 186       tie_column_ = 0;
 187     }
 188
 189   vector<Head_event_tuple> new_heads_to_tie;
 190
 191   for (vsize i = 0; i < now_heads_.size (); i++)
 192     {
 193       Grob *head = now_heads_[i];
 194       Stream_event *left_ev
 195         = unsmob_stream_event (head->get_property ("cause"));
 196
 197       if (!left_ev)
 198         {
 199           // may happen for ambituses
 200           continue;
 201         }
 202
 203
 204       SCM left_articulations = left_ev->get_property ("articulations");
 205
 206       Stream_event *tie_event = 0;
 207       Stream_event *tie_stream_event = event_;
 208       for (SCM s = left_articulations;
 209            !tie_event && !tie_stream_event && scm_is_pair (s);
 210            s = scm_cdr (s))
 211         {
 212           Stream_event *ev = unsmob_stream_event (scm_car (s));
 213           if (!ev)
 214             continue;
 215
 216           if (ev->in_event_class ("tie-event"))
 217             tie_event = ev;
 218         }
 219
 220       if (left_ev && (tie_event || tie_stream_event))
 221         {
 222           Head_event_tuple event_tup;
 223
 224           SCM start_definition
 225             = updated_grob_properties (context (), ly_symbol2scm ("Tie"));
 226
 227           event_tup.head_ = head;
 228           event_tup.tie_definition_ = start_definition;
 229           event_tup.tie_event_ = tie_event;
 230           event_tup.tie_stream_event_ = tie_stream_event;
 231
 232           Moment end = now_mom ();
 233           if (end.grace_part_)
 234             {
 235               end.grace_part_ += get_event_length (left_ev).main_part_;
 236             }
 237           else
 238             {
 239               end += get_event_length (left_ev);
 240             }
 241           event_tup.end_moment_ = end;
 242
 243           new_heads_to_tie.push_back (event_tup);
 244         }
 245     }
 246
 247   if (!wait && new_heads_to_tie.size ())
 248     heads_to_tie_.clear ();
 249
 250   // hmmm, how to do with copy () ?
 251   for (vsize i = 0; i < new_heads_to_tie.size (); i++)
 252     heads_to_tie_.push_back (new_heads_to_tie[i]);
 253
 254   event_ = 0;
 255   now_heads_.clear ();
 256 }
 257
 258 void
 259 Tie_engraver::typeset_tie (Grob *her)
 260 {
 261   if (! (Tie::head (her, LEFT) && Tie::head (her, RIGHT)))
 262     warning (_ ("lonely tie"));
 263
 264   Direction d = LEFT;
 265   Drul_array<Grob *> new_head_drul;
 266   new_head_drul[LEFT] = Tie::head (her, LEFT);
 267   new_head_drul[RIGHT] = Tie::head (her, RIGHT);
 268   do
 269     {
 270       if (!Tie::head (her, d))
 271         new_head_drul[d] = Tie::head (her, (Direction) - d);
 272     }
 273   while (flip (&d) != LEFT);
 274
 275   Spanner *sp = dynamic_cast<Spanner*> (her);
 276   sp->set_bound (LEFT, new_head_drul[LEFT]);
 277   sp->set_bound (RIGHT, new_head_drul[RIGHT]);
 278 }
 279
 280 ADD_ACKNOWLEDGER (Tie_engraver, note_head);
 281 ADD_TRANSLATOR (Tie_engraver,
 282                 /* doc */
 283                 "Generate ties between note heads of equal pitch.",
 284
 285                 /* create */
 286                 "Tie "
 287                 "TieColumn ",
 288
 289                 /* read */
 290                 "tieWaitForNote ",
 291
 292                 /* write */
 293                 "tieMelismaBusy "
 294                 );