lily/fretboard-engraver.cc

   1 /*
   2   fretboard-engraver.cc -- part of GNU LilyPond
   3
   4   (c)  2006  Han-Wen Nienhuys
   5 */
   6
   7 #include <cctype>
   8 #include <cstdio>
   9 using namespace std;
  10
  11 #include "context.hh"
  12 #include "item.hh"
  13 #include "engraver.hh"
  14 #include "pitch.hh"
  15 #include "stream-event.hh"
  16 #include "warn.hh"
  17
  18 #include "translator.icc"
  19
  20 /**
  21    make (guitar-like) tablature note
  22 */
  23 class Fretboard_engraver : public Engraver
  24 {
  25   Item *fret_board_;
  26
  27   vector<Stream_event*> note_events_;
  28   vector<Stream_event*> tabstring_events_;
  29 public:
  30   TRANSLATOR_DECLARATIONS (Fretboard_engraver);
  31
  32 protected:
  33   void stop_translation_timestep ();
  34   void process_music ();
  35   virtual void derived_mark() const;
  36   DECLARE_TRANSLATOR_LISTENER (note);
  37   DECLARE_TRANSLATOR_LISTENER (string_number);
  38
  39 private:
  40   SCM last_fret_notes_;
  41 };
  42
  43
  44 void
  45 Fretboard_engraver::derived_mark () const
  46 {
  47   scm_gc_mark (last_fret_notes_);
  48 }
  49
  50 Fretboard_engraver::Fretboard_engraver ()
  51 {
  52   fret_board_ = 0;
  53   last_fret_notes_ = SCM_EOL;
  54 }
  55
  56 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, note);
  57 void
  58 Fretboard_engraver::listen_note (Stream_event *ev)
  59 {
  60   note_events_.push_back (ev);
  61 }
  62
  63 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, string_number);
  64 void
  65 Fretboard_engraver::listen_string_number (Stream_event *ev)
  66 {
  67   tabstring_events_.push_back (ev);
  68 }
  69
  70 void
  71 Fretboard_engraver::process_music ()
  72 {
  73   if (!note_events_.size ())
  74     return ;
  75
  76   fret_board_ = make_item ("FretBoard", note_events_[0]->self_scm ());
  77   SCM fret_notes = ly_cxx_vector_to_list (note_events_);
  78   SCM proc = get_property ("noteToFretFunction");
  79   if (ly_is_procedure (proc))
  80     {
  81      scm_call_4 (proc,
  82                  context ()->self_scm (),
  83                  fret_board_->self_scm (),
  84                  fret_notes,
  85                  ly_cxx_vector_to_list (tabstring_events_));
  86     }
  87   SCM changes = get_property("chordChanges");
  88   if (to_boolean (changes) && scm_is_pair(last_fret_notes_)
  89       && ly_is_equal (last_fret_notes_, fret_notes))
  90     fret_board_->set_property ("begin-of-line-visible", SCM_BOOL_T);
  91
  92   last_fret_notes_ = fret_notes;
  93 }
  94
  95 void
  96 Fretboard_engraver::stop_translation_timestep ()
  97 {
  98   fret_board_ = 0;
  99   note_events_.clear ();
 100   tabstring_events_.clear ();
 101 }
 102
 103 ADD_TRANSLATOR (Fretboard_engraver,
 104                 /* doc */
 105                 "Generate one or more tablature noteheads from event of type"
 106                 " @code{NoteEvent}.",
 107
 108                 /* create */
 109                 "FretBoard ",
 110
 111                 /* read */
 112                 "chordChanges "
 113                 "stringTunings "
 114                 "minimumFret "
 115                 "maximumFretStretch "
 116                 "tablatureFormat "
 117                 "highStringOne "
 118                 "predefinedDiagramTable",
 119
 120                 /* write */
 121                 ""
 122                 );
 123