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   bool ties_created_;
  24
  25 protected:
  26   void stop_translation_timestep ();
  27   void start_translation_timestep ();
  28   virtual void acknowledge_audio_element (Audio_element_info);
  29   void process_music ();
  30   DECLARE_TRANSLATOR_LISTENER (tie);
  31 public:
  32   TRANSLATOR_DECLARATIONS (Tie_performer);
  33 };
  34
  35 Tie_performer::Tie_performer ()
  36 {
  37   event_ = 0;
  38   ties_created_ = false;
  39 }
  40
  41 IMPLEMENT_TRANSLATOR_LISTENER (Tie_performer, tie);
  42 void
  43 Tie_performer::listen_tie (Stream_event *ev)
  44 {
  45   event_ = ev;
  46 }
  47
  48 void
  49 Tie_performer::process_music ()
  50 {
  51   if (event_)
  52     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  53 }
  54
  55 void
  56 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  57 {
  58   if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
  59     {
  60       if (an->tie_event_)
  61         now_tied_heads_.push_back (inf);
  62       else
  63         now_heads_.push_back (inf);
  64
  65       // Find a previous note that ties to the current note. If it exists,
  66       // remove it from the heads_to_tie vector and create the tie
  67       vector<Audio_element_info>::iterator it;
  68       bool found = false;
  69       Stream_event *right_mus = inf.event_;
  70       for ( it = heads_to_tie_.begin() ; (!found) && (it < heads_to_tie_.end()); it++ )
  71         {
  72           Audio_element_info et = *it;
  73           Audio_note *th = dynamic_cast<Audio_note *> (et.elem_);
  74           Stream_event *left_mus = et.event_;
  75
  76           if (th && right_mus && left_mus
  77               && ly_is_equal (right_mus->get_property ("pitch"),
  78                               left_mus->get_property ("pitch")))
  79             {
  80               found = true;
  81               an->tie_to (th);
  82               ties_created_ = true;
  83               // this invalidates the iterator, we are leaving the loop anyway
  84               heads_to_tie_.erase (it);
  85             }
  86         }
  87     }
  88 }
  89
  90 void
  91 Tie_performer::start_translation_timestep ()
  92 {
  93   context ()->set_property ("tieMelismaBusy",
  94                             ly_bool2scm (heads_to_tie_.size ()));
  95 }
  96
  97 void
  98 Tie_performer::stop_translation_timestep ()
  99 {
 100   // We might have dangling open ties like c~ d. Close them, unless we have
 101   // tieWaitForNote set...
 102   if (!to_boolean (get_property ("tieWaitForNote")))
 103     {
 104       heads_to_tie_.clear ();
 105       ties_created_ = false;
 106     }
 107
 108   if (event_)
 109     {
 110       heads_to_tie_ = now_heads_;
 111     }
 112
 113   for (vsize i = now_tied_heads_.size (); i--;)
 114     heads_to_tie_.push_back (now_tied_heads_[i]);
 115
 116   event_ = 0;
 117   now_heads_.clear ();
 118   now_tied_heads_.clear ();
 119 }
 120
 121 ADD_TRANSLATOR (Tie_performer,
 122                 /* doc */
 123                 "Generate ties between note heads of equal pitch.",
 124
 125                 /* create */
 126                 "",
 127
 128                 /* read */
 129                 "tieWaitForNote",
 130
 131                 /* write */
 132                 "tieMelismaBusy"
 133                 );