lily/note-heads-engraver.cc

   1 /*
   2   note-heads-engraver.cc -- part of GNU LilyPond
   3
   4   (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5 */
   6
   7 #include "engraver.hh"
   8
   9 #include <cctype>
  10 using namespace std;
  11
  12 #include "dots.hh"
  13 #include "dot-column.hh"
  14 #include "duration.hh"
  15 #include "item.hh"
  16 #include "output-def.hh"
  17 #include "pitch.hh"
  18 #include "rhythmic-head.hh"
  19 #include "staff-symbol-referencer.hh"
  20 #include "stream-event.hh"
  21 #include "warn.hh"
  22
  23 #include "translator.icc"
  24
  25 class Note_heads_engraver : public Engraver
  26 {
  27   vector<Item*> notes_;
  28   vector<Stream_event*> note_evs_;
  29
  30 public:
  31   TRANSLATOR_DECLARATIONS (Note_heads_engraver);
  32
  33 protected:
  34   DECLARE_TRANSLATOR_LISTENER (note);
  35   void process_music ();
  36   void stop_translation_timestep ();
  37 };
  38
  39 Note_heads_engraver::Note_heads_engraver ()
  40 {
  41 }
  42
  43 IMPLEMENT_TRANSLATOR_LISTENER (Note_heads_engraver, note);
  44 void
  45 Note_heads_engraver::listen_note (Stream_event *ev)
  46 {
  47   note_evs_.push_back (ev);
  48 }
  49
  50 void
  51 Note_heads_engraver::process_music ()
  52 {
  53   for (vsize i = 0; i < note_evs_.size (); i++)
  54     {
  55       Stream_event *ev = note_evs_[i];
  56       Item *note = make_item ("NoteHead", ev->self_scm ());
  57
  58       Pitch *pit = unsmob_pitch (ev->get_property ("pitch"));
  59
  60 #if 0 /* TODO: should have a mechanism to switch off these warnings. */
  61
  62       if (!pit)
  63         ev->origin ()->warning (_ ("NoteEvent without pitch"));
  64 #endif
  65
  66       int pos = pit ? pit->steps () : 0;
  67       SCM c0 = get_property ("middleCPosition");
  68       if (scm_is_number (c0))
  69         pos += scm_to_int (c0);
  70
  71       note->set_property ("staff-position", scm_from_int (pos));
  72
  73       /*
  74         Shape note heads change on step of the scale.
  75       */
  76       SCM shape_vector = get_property ("shapeNoteStyles");
  77       if (scm_is_vector (shape_vector))
  78         {
  79           SCM scm_tonic = get_property ("tonic");
  80           Pitch tonic (0, 0, 0);
  81           if (unsmob_pitch (scm_tonic))
  82             tonic = *unsmob_pitch (scm_tonic);
  83
  84           unsigned int delta = (pit->get_notename () - tonic.get_notename () + 7) % 7;
  85
  86           SCM style = SCM_EOL;
  87           if (scm_c_vector_length (shape_vector) > delta
  88               && scm_is_symbol (scm_vector_ref (shape_vector, scm_from_int (delta))))
  89             style = scm_vector_ref (shape_vector, scm_from_int (delta));
  90           if (scm_is_symbol (style))
  91             note->set_property ("style", style);
  92         }
  93
  94       notes_.push_back (note);
  95     }
  96 }
  97
  98 void
  99 Note_heads_engraver::stop_translation_timestep ()
 100 {
 101   notes_.clear ();
 102   note_evs_.clear ();
 103 }
 104
 105 ADD_TRANSLATOR (Note_heads_engraver,
 106                 /* doc */ "Generate noteheads.",
 107                 /* create */
 108                 "NoteHead ",
 109                 /* accept */
 110                 "note-event",
 111                 /* read */ "middleCPosition",
 112                 /* write */ "");