lily/note-heads-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   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 "engraver.hh"
  21
  22 #include <cctype>
  23 using namespace std;
  24
  25 #include "duration.hh"
  26 #include "item.hh"
  27 #include "output-def.hh"
  28 #include "pitch.hh"
  29 #include "rhythmic-head.hh"
  30 #include "staff-symbol-referencer.hh"
  31 #include "stream-event.hh"
  32 #include "warn.hh"
  33
  34 #include "translator.icc"
  35
  36 class Note_heads_engraver : public Engraver
  37 {
  38   vector<Stream_event *> note_evs_;
  39
  40 public:
  41   TRANSLATOR_DECLARATIONS (Note_heads_engraver);
  42
  43 protected:
  44   DECLARE_TRANSLATOR_LISTENER (note);
  45   void process_music ();
  46   void stop_translation_timestep ();
  47 };
  48
  49 Note_heads_engraver::Note_heads_engraver ()
  50 {
  51 }
  52
  53 IMPLEMENT_TRANSLATOR_LISTENER (Note_heads_engraver, note);
  54 void
  55 Note_heads_engraver::listen_note (Stream_event *ev)
  56 {
  57   note_evs_.push_back (ev);
  58 }
  59
  60 void
  61 Note_heads_engraver::process_music ()
  62 {
  63   SCM c0 = get_property ("middleCPosition");
  64   SCM layout_proc = get_property ("staffLineLayoutFunction");
  65
  66   for (vsize i = 0; i < note_evs_.size (); i++)
  67     {
  68       Stream_event *ev = note_evs_[i];
  69       Item *note = make_item ("NoteHead", ev->self_scm ());
  70
  71       Pitch *pit = unsmob_pitch (ev->get_property ("pitch"));
  72
  73 #if 0 /* TODO: should have a mechanism to switch off these warnings. */
  74
  75       if (!pit)
  76         ev->origin ()->warning (_ ("NoteEvent without pitch"));
  77 #endif
  78
  79       int pos;
  80       if (pit == 0)
  81         pos = 0;
  82       else if (ly_is_procedure (layout_proc))
  83         {
  84           SCM pitch = ev->get_property ("pitch");
  85           pos = scm_to_int (scm_call_1 (layout_proc, pitch));
  86         }
  87       else
  88         pos = pit->steps ();
  89
  90       if (scm_is_number (c0))
  91         pos += scm_to_int (c0);
  92
  93       note->set_property ("staff-position", scm_from_int (pos));
  94
  95       /*
  96         Shape note heads change on step of the scale.
  97       */
  98       SCM shape_vector = get_property ("shapeNoteStyles");
  99       if (scm_is_vector (shape_vector))
 100         {
 101           SCM scm_tonic = get_property ("tonic");
 102           Pitch tonic (0, 0, 0);
 103           if (unsmob_pitch (scm_tonic))
 104             tonic = *unsmob_pitch (scm_tonic);
 105
 106           unsigned int delta = (pit->get_notename () - tonic.get_notename () + 7) % 7;
 107
 108           SCM style = SCM_EOL;
 109           if (scm_c_vector_length (shape_vector) > delta
 110               && scm_is_symbol (scm_vector_ref (shape_vector, scm_from_int (delta))))
 111             style = scm_vector_ref (shape_vector, scm_from_int (delta));
 112           if (scm_is_symbol (style))
 113             note->set_property ("style", style);
 114         }
 115     }
 116 }
 117
 118 void
 119 Note_heads_engraver::stop_translation_timestep ()
 120 {
 121   note_evs_.clear ();
 122 }
 123
 124 ADD_TRANSLATOR (Note_heads_engraver,
 125                 /* doc */
 126                 "Generate note heads.",
 127
 128                 /* create */
 129                 "NoteHead ",
 130
 131                 /* read */
 132                 "middleCPosition "
 133                 "staffLineLayoutFunction ",
 134
 135                 /* write */
 136                 ""
 137                 );