lily/tie-engraver.cc

   1 /*
   2   new-tie-engraver.cc --  implement Tie_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "event.hh"
  11 #include "tie.hh"
  12 #include "translator-group.hh"
  13 #include "spanner.hh"
  14 #include "tie-column.hh"
  15 #include "engraver.hh"
  16 #include "item.hh"
  17 #include "grob-pitch-tuple.hh"
  18 #include "warn.hh"
  19 #include "note-head.hh"
  20
  21 /**
  22    Manufacture ties.  Acknowledge noteheads, and put them into a
  23    priority queue. If we have a TieEvent, connect the notes that finish
  24    just at this time, and note that start at this time.
  25
  26    TODO: Remove the dependency on musical info. We should tie on the
  27    basis of position and duration-log of the heads (not of the events).
  28
  29    TODO: support sparseTies.
  30
  31    TODO: melismata will fuck up now:
  32
  33    < { c8 ~ c8 }
  34      { c16 c c c  } >
  35
  36    melisma is after the 2nd 8th note, but will now be signaled as
  37    lasting till the 3rd 16th.
  38 */
  39 class Tie_engraver : public Engraver
  40 {
  41   Music *event_;
  42   Music *last_event_;
  43   Link_array<Grob> now_heads_;
  44   Link_array<Grob> heads_to_tie_;
  45   Link_array<Grob> ties_;
  46
  47   Spanner * tie_column_;
  48
  49
  50 protected:
  51   virtual void stop_translation_timestep ();
  52   virtual void acknowledge_grob (Grob_info);
  53   virtual bool try_music (Music*);
  54   virtual void process_acknowledged_grobs ();
  55   void typeset_tie (Grob*);
  56 public:
  57   TRANSLATOR_DECLARATIONS(Tie_engraver);
  58 };
  59
  60
  61
  62 Tie_engraver::Tie_engraver ()
  63 {
  64   event_ = 0;
  65   last_event_  = 0;
  66   tie_column_ = 0;
  67 }
  68
  69
  70 bool
  71 Tie_engraver::try_music (Music *mus)
  72 {
  73   if (mus->is_mus_type ("tie-event"))
  74     {
  75       event_ = mus;
  76     }
  77
  78   if (event_)
  79     {
  80       SCM m = get_property ("automaticMelismata");
  81       bool am = gh_boolean_p (m) &&gh_scm2bool (m);
  82       if (am)
  83         {
  84   daddy_trans_->set_property ("tieMelismaBusy", m ? SCM_BOOL_T : SCM_BOOL_F);
  85         }
  86     }
  87   return true;
  88 }
  89
  90 void
  91 Tie_engraver::acknowledge_grob (Grob_info i)
  92 {
  93   if (Note_head::has_interface (i.grob_))
  94     {
  95       Grob * h  = i.grob_;
  96       now_heads_.push (h);
  97       for  (int i = heads_to_tie_.size (); i--;)
  98         {
  99           Grob *th =  heads_to_tie_[i];
 100           int staff_pos = gh_scm2int (h->get_grob_property ("staff-position"));
 101           int left_staff_pos = gh_scm2int (th->get_grob_property ("staff-position"));
 102           if (staff_pos == left_staff_pos)
 103             {
 104               Grob * p = new Spanner (get_property ("Tie"));
 105               Tie::set_interface (p); // cannot remove yet!
 106
 107               Tie::set_head (p, LEFT, th);
 108               Tie::set_head (p, RIGHT, h);
 109
 110               ties_.push (p);
 111               announce_grob(p, last_event_->self_scm());
 112             }
 113         }
 114     }
 115 }
 116
 117 void
 118 Tie_engraver::process_acknowledged_grobs ()
 119 {
 120   if (ties_.size () > 1 && !tie_column_)
 121     {
 122       tie_column_ = new Spanner (get_property ("TieColumn"));
 123
 124       for (int i = ties_.size (); i--;)
 125         Tie_column::add_tie (tie_column_,ties_ [i]);
 126
 127       announce_grob(tie_column_, SCM_EOL);
 128     }
 129 }
 130
 131
 132 void
 133 Tie_engraver::stop_translation_timestep ()
 134 {
 135   if (ties_.size ())
 136     {
 137       heads_to_tie_.clear ();
 138       for (int i=0; i<  ties_.size (); i++)
 139         {
 140           typeset_tie (ties_[i]);
 141         }
 142
 143       ties_.clear();
 144       last_event_ = 0;
 145       if (tie_column_)
 146         {
 147           typeset_grob (tie_column_);
 148           tie_column_ =0;
 149         }
 150     }
 151
 152   if (event_)
 153     {
 154       heads_to_tie_ = now_heads_;
 155       last_event_ = event_;
 156     }
 157   event_ = 0;
 158   now_heads_.clear ();
 159 }
 160
 161 void
 162 Tie_engraver::typeset_tie (Grob *her)
 163 {
 164   if (! (Tie::head (her,LEFT) && Tie::head (her,RIGHT)))
 165     warning (_ ("lonely tie"));
 166
 167   Direction d = LEFT;
 168   Drul_array<Grob *> new_head_drul;
 169   new_head_drul[LEFT] = Tie::head (her,LEFT);
 170   new_head_drul[RIGHT] = Tie::head (her,RIGHT);
 171   do {
 172     if (!Tie::head (her,d))
 173       new_head_drul[d] = Tie::head (her, (Direction)-d);
 174   } while (flip (&d) != LEFT);
 175
 176   index_set_cell (her->get_grob_property ("heads"), LEFT, new_head_drul[LEFT]->self_scm ());
 177   index_set_cell (her->get_grob_property ("heads"), RIGHT, new_head_drul[RIGHT]->self_scm ());
 178
 179   typeset_grob (her);
 180 }
 181
 182
 183 ENTER_DESCRIPTION(Tie_engraver,
 184 /* descr */       "Generate ties between noteheads of equal pitch.",
 185 /* creats*/       "Tie TieColumn",
 186 /* accepts */     "tie-event",
 187 /* acks  */      "rhythmic-head-interface",
 188 /* reads */       "tieMelismaBusy",
 189 /* write */       "");