lily/rest-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 "dots.hh"
  23 #include "duration.hh"
  24 #include "item.hh"
  25 #include "pitch.hh"
  26 #include "rhythmic-head.hh"
  27 #include "staff-symbol-referencer.hh"
  28 #include "stream-event.hh"
  29
  30 #include "translator.icc"
  31
  32 class Rest_engraver : public Engraver
  33 {
  34   Stream_event *rest_event_;
  35   Item *dot_;
  36   Grob *rest_;
  37 protected:
  38   void start_translation_timestep ();
  39   void process_music ();
  40   DECLARE_TRANSLATOR_LISTENER (rest);
  41 public:
  42   TRANSLATOR_DECLARATIONS (Rest_engraver);
  43 };
  44
  45 /*
  46   Should merge with Note_head_engraver
  47 */
  48 Rest_engraver::Rest_engraver ()
  49 {
  50   rest_event_ = 0;
  51   rest_ = 0;
  52   dot_ = 0;
  53 }
  54
  55 void
  56 Rest_engraver::start_translation_timestep ()
  57 {
  58   rest_event_ = 0;
  59   rest_ = 0;
  60   dot_ = 0;
  61 }
  62
  63 void
  64 Rest_engraver::process_music ()
  65 {
  66   if (rest_event_ && !rest_)
  67     {
  68       rest_ = make_item ("Rest", rest_event_->self_scm ());
  69       Pitch *p = unsmob_pitch (rest_event_->get_property ("pitch"));
  70
  71       if (p)
  72         {
  73           int pos = p->steps ();
  74           SCM c0 = get_property ("middleCPosition");
  75           if (scm_is_number (c0))
  76             pos += scm_to_int (c0);
  77
  78           rest_->set_property ("staff-position", scm_from_int (pos));
  79         }
  80     }
  81 }
  82
  83 IMPLEMENT_TRANSLATOR_LISTENER (Rest_engraver, rest);
  84 void
  85 Rest_engraver::listen_rest (Stream_event *ev)
  86 {
  87   ASSIGN_EVENT_ONCE (rest_event_, ev);
  88 }
  89
  90 ADD_TRANSLATOR (Rest_engraver,
  91                 /* doc */
  92                 "Engrave rests.",
  93
  94                 /* create */
  95                 "Rest ",
  96
  97                 /* read */
  98                 "middleCPosition ",
  99
 100                 /* write */
 101                 ""
 102                 );