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--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "performer.hh"
  10
  11 #include "music.hh"
  12 #include "context.hh"
  13 #include "audio-item.hh"
  14 #include "pqueue.hh"
  15
  16
  17 class Tie_performer : public Performer
  18 {
  19   Music *event_;
  20   Music *last_event_;
  21   Array<Audio_element_info> now_heads_;
  22   Array<Audio_element_info> heads_to_tie_;
  23
  24   bool ties_created_;
  25
  26 protected:
  27   PRECOMPUTED_VIRTUAL void stop_translation_timestep ();
  28   PRECOMPUTED_VIRTUAL void start_translation_timestep ();
  29   virtual void acknowledge_audio_element (Audio_element_info);
  30   virtual bool try_music (Music *);
  31   PRECOMPUTED_VIRTUAL void process_music ();
  32 public:
  33   TRANSLATOR_DECLARATIONS (Tie_performer);
  34 };
  35
  36 Tie_performer::Tie_performer ()
  37 {
  38   event_ = 0;
  39   last_event_ = 0;
  40   ties_created_ = false;
  41 }
  42
  43 bool
  44 Tie_performer::try_music (Music *mus)
  45 {
  46   if (mus->is_mus_type ("tie-event"))
  47     {
  48       event_ = mus;
  49     }
  50
  51   return true;
  52 }
  53
  54 void
  55 Tie_performer::process_music ()
  56 {
  57   if (event_)
  58     context ()->set_property ("tieMelismaBusy", SCM_BOOL_T);
  59 }
  60
  61 void
  62 Tie_performer::acknowledge_audio_element (Audio_element_info inf)
  63 {
  64   if (Audio_note *an = dynamic_cast<Audio_note *> (inf.elem_))
  65     {
  66       now_heads_.push (inf);
  67       for (int i = heads_to_tie_.size (); i--;)
  68         {
  69           Music *right_mus = inf.event_;
  70
  71           Audio_note *th = dynamic_cast<Audio_note *> (heads_to_tie_[i].elem_);
  72           Music *left_mus = heads_to_tie_[i].event_;
  73
  74           if (right_mus && left_mus
  75               && ly_is_equal (right_mus->get_property ("pitch"),
  76                                left_mus->get_property ("pitch")))
  77             {
  78               an->tie_to (th);
  79               ties_created_ = true;
  80             }
  81         }
  82     }
  83 }
  84
  85 void
  86 Tie_performer::start_translation_timestep ()
  87 {
  88   context ()->set_property ("tieMelismaBusy",
  89                             ly_bool2scm (heads_to_tie_.size ()));
  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 #include "translator.icc"
 112
 113 ADD_TRANSLATOR (Tie_performer,
 114                 /* descr */ "Generate ties between noteheads of equal pitch.",
 115                 /* creats*/ "",
 116                 /* accepts */ "tie-event",
 117                 /* reads */ "tieMelismaBusy",
 118                 /* write */ "");