lily/tie-performer.cc

   1 /*
   2   tie-performer.cc -- implement Tie_performer
   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 "performer.hh"
  10
  11 #include "audio-item.hh"
  12 #include "context.hh"
  13 #include "stream-event.hh"
  14 #include "translator.icc"
  15
  16 class Tie_performer : public Performer
  17 {
  18   Stream_event *event_;
  19   vector<Audio_element_info> now_heads_;
  20   vector<Audio_element_info> now_tied_heads_;
  21   vector<Audio_element_info> heads_to_tie_;
  22
  23 protected:
  24   void stop_translation_timestep ();
  25   void start_translation_timestep ();
  26   virtual void acknowledge_audio_element (Audio_element_info);
  27   void process_music ();
  28   DECLARE_TRANSLATOR_LISTENER (tie);
  29 public:
  30   TRANSLATOR_DECLARATIONS (Tie_performer);
  31 };
  32
  33 Tie_performer::Tie_performer ()
  34 {
  35   event_ = 0;
  36 }
  37
  38 IMPLEMENT_TRANSLATOR_LISTENER (Tie_performer, tie);
  39 void
  40 Tie_performer::listen_tie (Stream_event *ev)
  41 {
  42   event_ = ev;
  43 }
  44
  45 void
  46 Tie_performer::process_music ()
  47 {
  48   if (event_)
  49     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  50 }
  51
  52 void
  53 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  54 {
  55   if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
  56     {
  57       if (an->tie_event_)
  58         now_tied_heads_.push_back (inf);
  59       else
  60         now_heads_.push_back (inf);
  61
  62       // Find a previous note that ties to the current note. If it exists,
  63       // remove it from the heads_to_tie vector and create the tie
  64       vector<Audio_element_info>::iterator it;
  65       bool found = false;
  66       Stream_event *right_mus = inf.event_;
  67       for ( it = heads_to_tie_.begin() ; (!found) && (it < heads_to_tie_.end()); it++ )
  68         {
  69           Audio_element_info et = *it;
  70           Audio_note *th = dynamic_cast<Audio_note *> (et.elem_);
  71           Stream_event *left_mus = et.event_;
  72
  73           if (th && right_mus && left_mus
  74               && ly_is_equal (right_mus->get_property ("pitch"),
  75                               left_mus->get_property ("pitch")))
  76             {
  77               found = true;
  78               an->tie_to (th);
  79               // this invalidates the iterator, we are leaving the loop anyway
  80               heads_to_tie_.erase (it);
  81             }
  82         }
  83     }
  84 }
  85
  86 void
  87 Tie_performer::start_translation_timestep ()
  88 {
  89   context ()->set_property ("tieMelismaBusy",
  90                             ly_bool2scm (heads_to_tie_.size ()));
  91 }
  92
  93 void
  94 Tie_performer::stop_translation_timestep ()
  95 {
  96   // We might have dangling open ties like c~ d. Close them, unless we have
  97   // tieWaitForNote set...
  98   if (!to_boolean (get_property ("tieWaitForNote")))
  99     {
 100       heads_to_tie_.clear ();
 101     }
 102
 103   if (event_)
 104     {
 105       heads_to_tie_ = now_heads_;
 106     }
 107
 108   for (vsize i = now_tied_heads_.size (); i--;)
 109     heads_to_tie_.push_back (now_tied_heads_[i]);
 110
 111   event_ = 0;
 112   now_heads_.clear ();
 113   now_tied_heads_.clear ();
 114 }
 115
 116 ADD_TRANSLATOR (Tie_performer,
 117                 /* doc */
 118                 "Generate ties between note heads of equal pitch.",
 119
 120                 /* create */
 121                 "",
 122
 123                 /* read */
 124                 "tieWaitForNote",
 125
 126                 /* write */
 127                 "tieMelismaBusy"
 128                 );