lily/note-heads-engraver.cc

   1 /*
   2   note-heads-engraver.cc -- part of GNU LilyPond
   3
   4   (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5 */
   6
   7 #include "engraver.hh"
   8
   9 #include <cctype>
  10 using namespace std;
  11
  12 #include "duration.hh"
  13 #include "item.hh"
  14 #include "output-def.hh"
  15 #include "pitch.hh"
  16 #include "rhythmic-head.hh"
  17 #include "staff-symbol-referencer.hh"
  18 #include "stream-event.hh"
  19 #include "warn.hh"
  20
  21 #include "translator.icc"
  22
  23 class Note_heads_engraver : public Engraver
  24 {
  25   vector<Item*> notes_;
  26   vector<Stream_event*> note_evs_;
  27
  28 public:
  29   TRANSLATOR_DECLARATIONS (Note_heads_engraver);
  30
  31 protected:
  32   DECLARE_TRANSLATOR_LISTENER (note);
  33   void process_music ();
  34   void stop_translation_timestep ();
  35 };
  36
  37 Note_heads_engraver::Note_heads_engraver ()
  38 {
  39 }
  40
  41 IMPLEMENT_TRANSLATOR_LISTENER (Note_heads_engraver, note);
  42 void
  43 Note_heads_engraver::listen_note (Stream_event *ev)
  44 {
  45   note_evs_.push_back (ev);
  46 }
  47
  48 void
  49 Note_heads_engraver::process_music ()
  50 {
  51   SCM c0 = get_property ("middleCPosition");
  52   SCM layout_proc = get_property("staffLineLayoutFunction");
  53
  54   for (vsize i = 0; i < note_evs_.size (); i++)
  55     {
  56       Stream_event *ev = note_evs_[i];
  57       Item *note = make_item ("NoteHead", ev->self_scm ());
  58
  59       Pitch *pit = unsmob_pitch (ev->get_property ("pitch"));
  60
  61 #if 0 /* TODO: should have a mechanism to switch off these warnings. */
  62
  63       if (!pit)
  64         ev->origin ()->warning (_ ("NoteEvent without pitch"));
  65 #endif
  66
  67       int pos;
  68       if (pit == 0)
  69         pos = 0;
  70       else if (ly_is_procedure (layout_proc)){
  71         SCM pitch = ev->get_property("pitch");
  72         pos = scm_to_int(scm_call_1 (layout_proc, pitch));
  73       }
  74       else
  75         pos = pit->steps ();
  76
  77       if (scm_is_number (c0))
  78         pos += scm_to_int(c0);
  79
  80       note->set_property ("staff-position", scm_from_int (pos));
  81
  82       /*
  83         Shape note heads change on step of the scale.
  84       */
  85       SCM shape_vector = get_property ("shapeNoteStyles");
  86       if (scm_is_vector (shape_vector))
  87         {
  88           SCM scm_tonic = get_property ("tonic");
  89           Pitch tonic (0, 0, 0);
  90           if (unsmob_pitch (scm_tonic))
  91             tonic = *unsmob_pitch (scm_tonic);
  92
  93           unsigned int delta = (pit->get_notename () - tonic.get_notename () + 7) % 7;
  94
  95           SCM style = SCM_EOL;
  96           if (scm_c_vector_length (shape_vector) > delta
  97               && scm_is_symbol (scm_vector_ref (shape_vector, scm_from_int (delta))))
  98             style = scm_vector_ref (shape_vector, scm_from_int (delta));
  99           if (scm_is_symbol (style))
 100             note->set_property ("style", style);
 101         }
 102
 103       notes_.push_back (note);
 104     }
 105 }
 106
 107 void
 108 Note_heads_engraver::stop_translation_timestep ()
 109 {
 110   notes_.clear ();
 111   note_evs_.clear ();
 112 }
 113
 114 ADD_TRANSLATOR (Note_heads_engraver,
 115                 /* doc */
 116                 "Generate note heads.",
 117
 118                 /* create */
 119                 "NoteHead ",
 120
 121                 /* read */
 122                 "middleCPosition "
 123                 "staffLineLayoutFunction ",
 124
 125                 /* write */
 126                 ""
 127                 );