lily/fretboard-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2006--2010 Han-Wen Nienhuys
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <cctype>
  21 #include <cstdio>
  22 using namespace std;
  23
  24 #include "articulations.hh"
  25 #include "context.hh"
  26 #include "item.hh"
  27 #include "engraver.hh"
  28 #include "pitch.hh"
  29 #include "stream-event.hh"
  30 #include "warn.hh"
  31
  32 #include "translator.icc"
  33
  34 /**
  35    make (guitar-like) tablature note
  36 */
  37 class Fretboard_engraver : public Engraver
  38 {
  39   Item *fret_board_;
  40
  41   vector<Stream_event *> note_events_;
  42   vector<Stream_event *> tabstring_events_;
  43 public:
  44   TRANSLATOR_DECLARATIONS (Fretboard_engraver);
  45
  46 protected:
  47   void stop_translation_timestep ();
  48   void process_music ();
  49   virtual void derived_mark () const;
  50   DECLARE_TRANSLATOR_LISTENER (note);
  51   DECLARE_TRANSLATOR_LISTENER (string_number);
  52
  53 private:
  54   SCM last_fret_notes_;
  55 };
  56
  57 void
  58 Fretboard_engraver::derived_mark () const
  59 {
  60   scm_gc_mark (last_fret_notes_);
  61 }
  62
  63 Fretboard_engraver::Fretboard_engraver ()
  64 {
  65   fret_board_ = 0;
  66   last_fret_notes_ = SCM_EOL;
  67 }
  68
  69 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, note);
  70 void
  71 Fretboard_engraver::listen_note (Stream_event *ev)
  72 {
  73   note_events_.push_back (ev);
  74 }
  75
  76 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, string_number);
  77 void
  78 Fretboard_engraver::listen_string_number (Stream_event *ev)
  79 {
  80   tabstring_events_.push_back (ev);
  81 }
  82
  83 void
  84 Fretboard_engraver::process_music ()
  85 {
  86   if (!note_events_.size ())
  87     return;
  88
  89   SCM tab_strings = articulation_list (note_events_,
  90                                        tabstring_events_,
  91                                        "string-number-event");
  92   fret_board_ = make_item ("FretBoard", note_events_[0]->self_scm ());
  93   SCM fret_notes = ly_cxx_vector_to_list (note_events_);
  94   SCM proc = get_property ("noteToFretFunction");
  95   if (ly_is_procedure (proc))
  96     scm_call_4 (proc,
  97                 context ()->self_scm (),
  98                 fret_notes,
  99                 tab_strings,
 100                 fret_board_->self_scm ());
 101   SCM changes = get_property ("chordChanges");
 102   if (to_boolean (changes) && scm_is_pair (last_fret_notes_)
 103       && ly_is_equal (last_fret_notes_, fret_notes))
 104     fret_board_->set_property ("begin-of-line-visible", SCM_BOOL_T);
 105
 106   last_fret_notes_ = fret_notes;
 107 }
 108
 109 void
 110 Fretboard_engraver::stop_translation_timestep ()
 111 {
 112   fret_board_ = 0;
 113   note_events_.clear ();
 114   tabstring_events_.clear ();
 115 }
 116
 117 ADD_TRANSLATOR (Fretboard_engraver,
 118                 /* doc */
 119                 "Generate fret diagram from one or more events of type"
 120                 " @code{NoteEvent}.",
 121
 122                 /* create */
 123                 "FretBoard ",
 124
 125                 /* read */
 126                 "chordChanges "
 127                 "highStringOne "
 128                 "maximumFretStretch "
 129                 "minimumFret "
 130                 "noteToFretFunction "
 131                 "predefinedDiagramTable "
 132                 "stringTunings "
 133                 "tablatureFormat ",
 134
 135                 /* write */
 136                 ""
 137                 );
 138