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--2008 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       for (vsize i = heads_to_tie_.size (); i--;)
  66         {
  67           Stream_event *right_mus = inf.event_;
  68
  69           Audio_note *th = dynamic_cast<Audio_note *> (heads_to_tie_[i].elem_);
  70           Stream_event *left_mus = heads_to_tie_[i].event_;
  71
  72           if (right_mus && left_mus
  73               && ly_is_equal (right_mus->get_property ("pitch"),
  74                               left_mus->get_property ("pitch")))
  75             {
  76               an->tie_to (th);
  77               ties_created_ = true;
  78             }
  79         }
  80     }
  81 }
  82
  83 void
  84 Tie_performer::start_translation_timestep ()
  85 {
  86   context ()->set_property ("tieMelismaBusy",
  87                             ly_bool2scm (heads_to_tie_.size ()));
  88 }
  89
  90 void
  91 Tie_performer::stop_translation_timestep ()
  92 {
  93   if (ties_created_)
  94     {
  95       heads_to_tie_.clear ();
  96       ties_created_ = false;
  97     }
  98
  99   if (event_)
 100     {
 101       heads_to_tie_ = now_heads_;
 102     }
 103
 104   for (vsize i = now_tied_heads_.size (); i--;)
 105     heads_to_tie_.push_back (now_tied_heads_[i]);
 106
 107   event_ = 0;
 108   now_heads_.clear ();
 109   now_tied_heads_.clear ();
 110 }
 111
 112 ADD_TRANSLATOR (Tie_performer,
 113                 /* doc */
 114                 "Generate ties between note heads of equal pitch.",
 115
 116                 /* create */
 117                 "",
 118
 119                 /* read */
 120                 "tieMelismaBusy",
 121
 122                 /* write */
 123                 ""
 124                 );