lily/beam-performer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2011 Jan Nieuwenhuizen <janneke@gnu.org>
   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 "performer.hh"
  21 #include "audio-item.hh"
  22 #include "audio-column.hh"
  23 #include "global-context.hh"
  24 #include "stream-event.hh"
  25 #include "warn.hh"
  26
  27 #include "translator.icc"
  28
  29 class Beam_performer : public Performer
  30 {
  31 public:
  32   TRANSLATOR_DECLARATIONS (Beam_performer);
  33
  34 protected:
  35   void start_translation_timestep ();
  36   void process_music ();
  37   void set_melisma (bool);
  38   DECLARE_TRANSLATOR_LISTENER (beam);
  39 private:
  40   Stream_event *start_ev_;
  41   Stream_event *now_stop_ev_;
  42   bool beam_;
  43 };
  44
  45 Beam_performer::Beam_performer ()
  46 {
  47   beam_ = false;
  48   start_ev_ = 0;
  49   now_stop_ev_ = 0;
  50 }
  51
  52 void
  53 Beam_performer::process_music ()
  54 {
  55   if (now_stop_ev_)
  56     {
  57       beam_ = false;
  58       set_melisma (false);
  59     }
  60
  61   if (start_ev_)
  62     {
  63       beam_ = true;
  64       set_melisma (true);
  65     }
  66 }
  67
  68 void
  69 Beam_performer::set_melisma (bool ml)
  70 {
  71   SCM b = get_property ("autoBeaming");
  72   if (!to_boolean (b))
  73     context ()->set_property ("beamMelismaBusy", ml ? SCM_BOOL_T : SCM_BOOL_F);
  74 }
  75
  76 void
  77 Beam_performer::start_translation_timestep ()
  78 {
  79   start_ev_ = 0;
  80   now_stop_ev_ = 0;
  81 }
  82
  83 IMPLEMENT_TRANSLATOR_LISTENER (Beam_performer, beam);
  84 void
  85 Beam_performer::listen_beam (Stream_event *ev)
  86 {
  87   Direction d = to_dir (ev->get_property ("span-direction"));
  88
  89   if (d == START)
  90     start_ev_ = ev;
  91   else if (d == STOP)
  92     now_stop_ev_ = ev;
  93 }
  94
  95 ADD_TRANSLATOR (Beam_performer,
  96                 /* doc */
  97                 "",
  98
  99                 /* create */
 100                 "",
 101
 102                 /* read */
 103                 "",
 104
 105                 /* write */
 106                 ""
 107                 );
 108