lily/tie-performer.cc

   1 /*
   2   new-tie-engraver.cc --  implement Tie_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "context.hh"
  11 #include "audio-item.hh"
  12 #include "event.hh"
  13 #include "pqueue.hh"
  14 #include "performer.hh"
  15
  16 class Tie_performer : public Performer
  17 {
  18   Music *event_;
  19   Music *last_event_;
  20   Array<Audio_element_info> now_heads_;
  21   Array<Audio_element_info> heads_to_tie_;
  22
  23   bool ties_created_;
  24
  25 protected:
  26   virtual void stop_translation_timestep ();
  27   virtual void start_translation_timestep ();
  28   virtual void acknowledge_audio_element (Audio_element_info);
  29   virtual bool try_music (Music*);
  30   virtual void process_music ();
  31 public:
  32   TRANSLATOR_DECLARATIONS (Tie_performer);
  33 };
  34
  35 Tie_performer::Tie_performer ()
  36 {
  37   event_ = 0;
  38   last_event_  = 0;
  39   ties_created_ = false;
  40 }
  41
  42 bool
  43 Tie_performer::try_music (Music *mus)
  44 {
  45   if (mus->is_mus_type ("tie-event"))
  46     {
  47       event_ = mus;
  48     }
  49
  50   return true;
  51 }
  52
  53 void
  54 Tie_performer::process_music ()
  55 {
  56   if (event_)
  57     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  58 }
  59
  60 void
  61 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  62 {
  63   if (Audio_note * an = dynamic_cast<Audio_note *> (inf.elem_))
  64     {
  65       now_heads_.push (inf);
  66       for  (int i = heads_to_tie_.size (); i--;)
  67         {
  68           Music * right_mus = inf.event_;
  69
  70           Audio_note *th =  dynamic_cast<Audio_note*> (heads_to_tie_[i].elem_);
  71           Music * left_mus = heads_to_tie_[i].event_;
  72
  73           if (right_mus && left_mus
  74               && ly_c_equal_p (right_mus->get_property ("pitch"),
  75                                left_mus->get_property ("pitch")))
  76             {
  77               an->tie_to (th);
  78               ties_created_ = true;
  79             }
  80         }
  81     }
  82 }
  83
  84 void
  85 Tie_performer::start_translation_timestep ()
  86 {
  87   context ()->set_property ("tieMelismaBusy",
  88                             ly_bool2scm (heads_to_tie_.size ()));
  89
  90 }
  91
  92 void
  93 Tie_performer::stop_translation_timestep ()
  94 {
  95   if (ties_created_)
  96     {
  97       heads_to_tie_.clear ();
  98       last_event_ = 0;
  99       ties_created_ = false;
 100     }
 101
 102   if (event_)
 103     {
 104       heads_to_tie_ = now_heads_;
 105       last_event_ = event_;
 106     }
 107   event_ = 0;
 108   now_heads_.clear ();
 109 }
 110
 111 ENTER_DESCRIPTION (Tie_performer,
 112 /* descr */       "Generate ties between noteheads of equal pitch.",
 113 /* creats*/       "",
 114 /* accepts */     "tie-event",
 115 /* acks  */       "",
 116 /* reads */       "tieMelismaBusy",
 117 /* write */       "");