lily/laissez-vibrer-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "engraver.hh"
  22 #include "item.hh"
  23 #include "pointer-group-interface.hh"
  24 #include "stream-event.hh"
  25
  26 #include "translator.icc"
  27
  28 class Laissez_vibrer_engraver : public Engraver
  29 {
  30   Stream_event *event_;
  31   Grob *lv_column_;
  32   vector<Grob*> lv_ties_;
  33
  34   void stop_translation_timestep ();
  35   DECLARE_ACKNOWLEDGER (note_head);
  36 protected:
  37   DECLARE_TRANSLATOR_LISTENER (laissez_vibrer);
  38 public:
  39   TRANSLATOR_DECLARATIONS (Laissez_vibrer_engraver);
  40 };
  41
  42 Laissez_vibrer_engraver::Laissez_vibrer_engraver ()
  43 {
  44   event_ = 0;
  45   lv_column_ = 0;
  46 }
  47
  48 void
  49 Laissez_vibrer_engraver::stop_translation_timestep ()
  50 {
  51   event_ = 0;
  52   lv_column_ = 0;
  53   lv_ties_.clear ();
  54 }
  55
  56 IMPLEMENT_TRANSLATOR_LISTENER (Laissez_vibrer_engraver, laissez_vibrer);
  57 void
  58 Laissez_vibrer_engraver::listen_laissez_vibrer (Stream_event *ev)
  59 {
  60   ASSIGN_EVENT_ONCE (event_, ev);
  61 }
  62
  63 void
  64 Laissez_vibrer_engraver::acknowledge_note_head (Grob_info inf)
  65 {
  66   if (!event_)
  67     return;
  68
  69   SCM cause = event_->self_scm ();
  70
  71   if (!lv_column_)
  72     lv_column_ = make_item ("LaissezVibrerTieColumn", cause);
  73
  74   Grob *lv_tie = make_item ("LaissezVibrerTie", cause);
  75   lv_tie->set_object ("note-head", inf.grob ()->self_scm ());
  76
  77   Pointer_group_interface::add_grob (lv_column_, ly_symbol2scm ("ties"),
  78                                      lv_tie);
  79
  80   if (is_direction (unsmob_stream_event (cause)->get_property ("direction")))
  81     {
  82       Direction d = to_dir (unsmob_stream_event (cause)->get_property ("direction"));
  83       lv_tie->set_property ("direction", scm_from_int (d));
  84     }
  85
  86   lv_tie->set_parent (lv_column_, Y_AXIS);
  87
  88   lv_ties_.push_back (lv_tie);
  89 }
  90
  91 ADD_ACKNOWLEDGER (Laissez_vibrer_engraver, note_head);
  92 ADD_TRANSLATOR (Laissez_vibrer_engraver,
  93                 /* doc */
  94                 "Create laissez vibrer items.",
  95
  96                 /* create */
  97                 "LaissezVibrerTie "
  98                 "LaissezVibrerTieColumn ",
  99
 100                 /* read */
 101                 "",
 102
 103                 /* write */
 104                 ""
 105                 );