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 start_translation_timestep ();
  53   virtual void acknowledge_grob (Grob_info);
  54   virtual bool try_music (Music*);
  55   virtual void process_acknowledged_grobs ();
  56   void typeset_tie (Grob*);
  57 public:
  58   TRANSLATOR_DECLARATIONS(Tie_engraver);
  59 };
  60
  61
  62
  63 Tie_engraver::Tie_engraver ()
  64 {
  65   event_ = 0;
  66   last_event_  = 0;
  67   tie_column_ = 0;
  68 }
  69
  70
  71 bool
  72 Tie_engraver::try_music (Music *mus)
  73 {
  74   if (mus->is_mus_type ("tie-event"))
  75     {
  76       event_ = mus;
  77     }
  78
  79   return true;
  80 }
  81
  82 void
  83 Tie_engraver::acknowledge_grob (Grob_info i)
  84 {
  85   if (Note_head::has_interface (i.grob_))
  86     {
  87       Grob * h  = i.grob_;
  88       now_heads_.push (h);
  89       for  (int i = heads_to_tie_.size (); i--;)
  90         {
  91           Grob *th =  heads_to_tie_[i];
  92           int staff_pos = gh_scm2int (h->get_grob_property ("staff-position"));
  93           int left_staff_pos = gh_scm2int (th->get_grob_property ("staff-position"));
  94           if (staff_pos == left_staff_pos)
  95             {
  96               Grob * p = new Spanner (get_property ("Tie"));
  97               Tie::set_interface (p); // cannot remove yet!
  98
  99               Tie::set_head (p, LEFT, th);
 100               Tie::set_head (p, RIGHT, h);
 101
 102               ties_.push (p);
 103               announce_grob(p, last_event_->self_scm());
 104             }
 105         }
 106     }
 107 }
 108
 109 void
 110 Tie_engraver::process_acknowledged_grobs ()
 111 {
 112   if (ties_.size () > 1 && !tie_column_)
 113     {
 114       tie_column_ = new Spanner (get_property ("TieColumn"));
 115
 116       for (int i = ties_.size (); i--;)
 117         Tie_column::add_tie (tie_column_,ties_ [i]);
 118
 119       announce_grob(tie_column_, SCM_EOL);
 120     }
 121 }
 122
 123 void
 124 Tie_engraver::start_translation_timestep ()
 125 {
 126   if (to_boolean (get_property ("automaticMelismata")))
 127       daddy_trans_->set_property ("tieMelismaBusy",
 128                                   gh_bool2scm (heads_to_tie_.size ()));
 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 */       "");