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--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "performer.hh"
  10
  11 #include "audio-item.hh"
  12 #include "context.hh"
  13 #include "pqueue.hh"
  14 #include "stream-event.hh"
  15 #include "translator.icc"
  16
  17 class Tie_performer : public Performer
  18 {
  19   Stream_event *event_;
  20   vector<Audio_element_info> now_heads_;
  21   vector<Audio_element_info> now_tied_heads_;
  22   vector<Audio_element_info> heads_to_tie_;
  23
  24   bool ties_created_;
  25
  26 protected:
  27   void stop_translation_timestep ();
  28   void start_translation_timestep ();
  29   virtual void acknowledge_audio_element (Audio_element_info);
  30   void process_music ();
  31   DECLARE_TRANSLATOR_LISTENER (tie);
  32 public:
  33   TRANSLATOR_DECLARATIONS (Tie_performer);
  34 };
  35
  36 Tie_performer::Tie_performer ()
  37 {
  38   event_ = 0;
  39   ties_created_ = false;
  40 }
  41
  42 IMPLEMENT_TRANSLATOR_LISTENER (Tie_performer, tie);
  43 void
  44 Tie_performer::listen_tie (Stream_event *ev)
  45 {
  46   event_ = ev;
  47 }
  48
  49 void
  50 Tie_performer::process_music ()
  51 {
  52   if (event_)
  53     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  54 }
  55
  56 void
  57 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  58 {
  59   if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
  60     {
  61       if (an->tie_event_)
  62         now_tied_heads_.push_back (inf);
  63       else
  64         now_heads_.push_back (inf);
  65
  66       for (vsize i = heads_to_tie_.size (); i--;)
  67         {
  68           Stream_event *right_mus = inf.event_;
  69
  70           Audio_note *th = dynamic_cast<Audio_note *> (heads_to_tie_[i].elem_);
  71           Stream_event *left_mus = heads_to_tie_[i].event_;
  72
  73           if (right_mus && left_mus
  74               && ly_is_equal (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 void
  92 Tie_performer::stop_translation_timestep ()
  93 {
  94   if (ties_created_)
  95     {
  96       heads_to_tie_.clear ();
  97       ties_created_ = false;
  98     }
  99
 100   if (event_)
 101     {
 102       heads_to_tie_ = now_heads_;
 103     }
 104
 105   for (vsize i = now_tied_heads_.size(); i--;)
 106     heads_to_tie_.push_back (now_tied_heads_[i]);
 107
 108   event_ = 0;
 109   now_heads_.clear ();
 110   now_tied_heads_.clear ();
 111 }
 112
 113 ADD_TRANSLATOR (Tie_performer,
 114                 /* doc */ "Generate ties between noteheads of equal pitch.",
 115                 /* create */ "",
 116                 /* accept */ "tie-event",
 117                 /* read */ "tieMelismaBusy",
 118                 /* write */ "");