lily/fretboard-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2006--2011 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   vector<Stream_event *> fingering_events_;
  44 public:
  45   TRANSLATOR_DECLARATIONS (Fretboard_engraver);
  46
  47 protected:
  48   void stop_translation_timestep ();
  49   void process_music ();
  50   virtual void derived_mark () const;
  51   DECLARE_TRANSLATOR_LISTENER (note);
  52   DECLARE_TRANSLATOR_LISTENER (string_number);
  53   DECLARE_TRANSLATOR_LISTENER (fingering);
  54
  55 private:
  56   SCM last_fret_notes_;
  57 };
  58
  59 void
  60 Fretboard_engraver::derived_mark () const
  61 {
  62   scm_gc_mark (last_fret_notes_);
  63 }
  64
  65 Fretboard_engraver::Fretboard_engraver ()
  66 {
  67   fret_board_ = 0;
  68   last_fret_notes_ = SCM_EOL;
  69 }
  70
  71 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, note);
  72 void
  73 Fretboard_engraver::listen_note (Stream_event *ev)
  74 {
  75   note_events_.push_back (ev);
  76 }
  77
  78 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, string_number);
  79 void
  80 Fretboard_engraver::listen_string_number (Stream_event *ev)
  81 {
  82   tabstring_events_.push_back (ev);
  83 }
  84
  85 IMPLEMENT_TRANSLATOR_LISTENER (Fretboard_engraver, fingering);
  86 void
  87 Fretboard_engraver::listen_fingering (Stream_event *ev)
  88 {
  89   fingering_events_.push_back (ev);
  90 }
  91
  92 void
  93 Fretboard_engraver::process_music ()
  94 {
  95   if (!note_events_.size ())
  96     return;
  97
  98   SCM tab_strings = articulation_list (note_events_,
  99                                        tabstring_events_,
 100                                        "string-number-event");
 101   SCM fingers = articulation_list (note_events_,
 102                                    fingering_events_,
 103                                    "fingering-event");
 104   fret_board_ = make_item ("FretBoard", note_events_[0]->self_scm ());
 105   SCM fret_notes = ly_cxx_vector_to_list (note_events_);
 106   SCM proc = get_property ("noteToFretFunction");
 107   if (ly_is_procedure (proc))
 108     scm_call_4 (proc,
 109                 context ()->self_scm (),
 110                 fret_notes,
 111                 scm_list_2 (tab_strings, fingers),
 112                 fret_board_->self_scm ());
 113   SCM changes = get_property ("chordChanges");
 114   if (to_boolean (changes) && scm_is_pair (last_fret_notes_)
 115       && ly_is_equal (last_fret_notes_, fret_notes))
 116     fret_board_->set_property ("begin-of-line-visible", SCM_BOOL_T);
 117
 118   last_fret_notes_ = fret_notes;
 119 }
 120
 121 void
 122 Fretboard_engraver::stop_translation_timestep ()
 123 {
 124   fret_board_ = 0;
 125   note_events_.clear ();
 126   tabstring_events_.clear ();
 127   fingering_events_.clear ();
 128 }
 129
 130 ADD_TRANSLATOR (Fretboard_engraver,
 131                 /* doc */
 132                 "Generate fret diagram from one or more events of type"
 133                 " @code{NoteEvent}.",
 134
 135                 /* create */
 136                 "FretBoard ",
 137
 138                 /* read */
 139                 "chordChanges "
 140                 "defaultStrings "
 141                 "highStringOne "
 142                 "maximumFretStretch "
 143                 "minimumFret "
 144                 "noteToFretFunction "
 145                 "predefinedDiagramTable "
 146                 "stringTunings "
 147                 "tablatureFormat ",
 148
 149                 /* write */
 150                 ""
 151                 );
 152