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_grob (Audio_element_info);
  29   virtual bool try_music (Music*);
  30   virtual void process_music ();
  31 public:
  32   TRANSLATOR_DECLARATIONS(Tie_performer);
  33 };
  34
  35
  36
  37 Tie_performer::Tie_performer ()
  38 {
  39   event_ = 0;
  40   last_event_  = 0;
  41 }
  42
  43
  44 bool
  45 Tie_performer::try_music (Music *mus)
  46 {
  47   if (mus->is_mus_type ("tie-event"))
  48     {
  49       event_ = mus;
  50     }
  51
  52   return true;
  53 }
  54
  55 void
  56 Tie_performer::process_music ()
  57 {
  58   if (event_)
  59     daddy_context_->set_property ("tieMelismaBusy", SCM_BOOL_T);
  60 }
  61
  62 void
  63 Tie_performer::acknowledge_grob (Audio_element_info inf)
  64 {
  65   if (Audio_note * an = dynamic_cast<Audio_note *> (inf.elem_))
  66     {
  67       now_heads_.push (inf);
  68       for  (int i = heads_to_tie_.size (); i--;)
  69         {
  70           Music * right_mus = inf.event_;
  71
  72           Audio_note *th =  dynamic_cast<Audio_note*> (heads_to_tie_[i].elem_);
  73           Music * left_mus = heads_to_tie_[i].event_;
  74
  75           if (right_mus && left_mus
  76               && gh_equal_p (right_mus->get_property ("pitch"),
  77                              left_mus->get_property ("pitch")))
  78             {
  79               an->tie_to (th);
  80             }
  81         }
  82     }
  83 }
  84
  85 void
  86 Tie_performer::start_translation_timestep ()
  87 {
  88   daddy_context_->set_property ("tieMelismaBusy",
  89                               gh_bool2scm (heads_to_tie_.size ()));
  90
  91 }
  92
  93 void
  94 Tie_performer::stop_translation_timestep ()
  95 {
  96   if (ties_created_)
  97     {
  98       heads_to_tie_.clear ();
  99       last_event_ = 0;
 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 */       "");