lily/new-dynamic-engraver.cc

   1 /*
   2   new-dynamic-engraver.cc -- implement New_dynamic_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2008 Han-Wen Nienhuys <hanwen@lilypond.org>
   7
   8 */
   9
  10
  11 #include "engraver.hh"
  12
  13 #include "international.hh"
  14 #include "item.hh"
  15 #include "note-column.hh"
  16 #include "pointer-group-interface.hh"
  17 #include "self-alignment-interface.hh"
  18 #include "spanner.hh"
  19 #include "stream-event.hh"
  20 #include "text-interface.hh"
  21
  22 #include "translator.icc"
  23
  24 class New_dynamic_engraver : public Engraver
  25 {
  26   TRANSLATOR_DECLARATIONS (New_dynamic_engraver);
  27   DECLARE_ACKNOWLEDGER (note_column);
  28   DECLARE_TRANSLATOR_LISTENER (absolute_dynamic);
  29   DECLARE_TRANSLATOR_LISTENER (span_dynamic);
  30
  31 protected:
  32   virtual void process_music ();
  33   virtual void stop_translation_timestep ();
  34 private:
  35   Drul_array<Stream_event *> accepted_spanevents_drul_;
  36   Spanner *current_spanner_;
  37   Spanner *finished_spanner_;
  38
  39   Item *script_;
  40   Stream_event *script_event_;
  41   Stream_event *current_span_event_;
  42 };
  43
  44 New_dynamic_engraver::New_dynamic_engraver ()
  45 {
  46   script_event_ = 0;
  47   current_span_event_ = 0;
  48   script_ = 0;
  49   finished_spanner_ = 0;
  50   current_spanner_ = 0;
  51   accepted_spanevents_drul_.set (0, 0);
  52 }
  53
  54 IMPLEMENT_TRANSLATOR_LISTENER (New_dynamic_engraver, absolute_dynamic);
  55 void
  56 New_dynamic_engraver::listen_absolute_dynamic (Stream_event *ev)
  57 {
  58   ASSIGN_EVENT_ONCE (script_event_, ev);
  59 }
  60
  61 IMPLEMENT_TRANSLATOR_LISTENER (New_dynamic_engraver, span_dynamic);
  62 void
  63 New_dynamic_engraver::listen_span_dynamic (Stream_event *ev)
  64 {
  65   Direction d = to_dir (ev->get_property ("span-direction"));
  66
  67   ASSIGN_EVENT_ONCE (accepted_spanevents_drul_[d], ev);
  68 }
  69
  70
  71 void
  72 New_dynamic_engraver::process_music ()
  73 {
  74   if (current_spanner_
  75       && (accepted_spanevents_drul_[STOP] || script_event_ || accepted_spanevents_drul_[START]))
  76     {
  77       Stream_event* ender = accepted_spanevents_drul_[STOP];
  78       if (!ender)
  79         ender = script_event_;
  80
  81       if (!ender)
  82         ender = accepted_spanevents_drul_[START];
  83
  84       finished_spanner_ = current_spanner_;
  85       announce_end_grob (finished_spanner_, ender->self_scm ());
  86       current_spanner_ = 0;
  87       current_span_event_ = 0;
  88     }
  89
  90   if (accepted_spanevents_drul_[START])
  91     {
  92       current_span_event_ = accepted_spanevents_drul_[START];
  93
  94       SCM start_sym = current_span_event_->get_property ("class");
  95       string start_type;
  96
  97       if (start_sym == ly_symbol2scm ("decrescendo-event"))
  98         start_type = "decrescendo";
  99       else if (start_sym == ly_symbol2scm ("crescendo-event"))
 100         start_type = "crescendo";
 101       else
 102         {
 103           programming_error ("unknown dynamic spanner type");
 104           return;
 105         }
 106
 107       SCM cresc_type = get_property ((start_type + "Spanner").c_str ());
 108
 109       if (cresc_type == ly_symbol2scm ("text"))
 110         {
 111           current_spanner_
 112             = make_spanner ("DynamicTextSpanner",
 113                             accepted_spanevents_drul_[START]->self_scm ());
 114
 115           SCM text = get_property ((start_type + "Text").c_str ());
 116           if (Text_interface::is_markup (text))
 117             {
 118               current_spanner_->set_property ("text", text);
 119             }
 120         }
 121       else
 122         {
 123           if (cresc_type != ly_symbol2scm ("hairpin"))
 124             {
 125               // Fixme: should put value in error message.
 126               string as_string = ly_scm_write_string (cresc_type);
 127               current_span_event_
 128                 ->origin()->warning (_f ("unknown crescendo style: %s\ndefaulting to hairpin.", as_string.c_str()));
 129             }
 130           current_spanner_ = make_spanner ("Hairpin",
 131                                            current_span_event_->self_scm ());
 132           if (finished_spanner_)
 133             {
 134               Pointer_group_interface::add_grob (finished_spanner_,
 135                                                  ly_symbol2scm ("adjacent-hairpins"),
 136                                                  current_spanner_);
 137
 138               Pointer_group_interface::add_grob (current_spanner_,
 139                                                  ly_symbol2scm ("adjacent-hairpins"),
 140                                                  finished_spanner_);
 141             }
 142         }
 143     }
 144
 145   if (script_event_)
 146     {
 147       script_ = make_item ("DynamicText", script_event_->self_scm ());
 148       script_->set_property ("text",
 149                              script_event_->get_property ("text"));
 150
 151       if (finished_spanner_)
 152         finished_spanner_->set_bound (RIGHT, script_);
 153       if (current_spanner_)
 154         {
 155           current_spanner_->set_bound (LEFT, script_);
 156           set_nested_property (current_spanner_,
 157                                scm_list_3 (ly_symbol2scm ("bound-details"),
 158                                            ly_symbol2scm ("left"),
 159                                            ly_symbol2scm ("attach-dir")
 160                                            ),
 161                                scm_from_int (RIGHT));
 162
 163         }
 164     }
 165 }
 166
 167
 168
 169 void
 170 New_dynamic_engraver::stop_translation_timestep ()
 171 {
 172   if (finished_spanner_ && !finished_spanner_->get_bound (RIGHT))
 173     finished_spanner_->set_bound (RIGHT,
 174                                   unsmob_grob (get_property ("currentMusicalColumn")));
 175
 176   if (current_spanner_ && !current_spanner_->get_bound (LEFT))
 177     current_spanner_->set_bound (LEFT,
 178                                  unsmob_grob (get_property ("currentMusicalColumn")));
 179   script_ = 0;
 180   script_event_ = 0;
 181   accepted_spanevents_drul_.set (0, 0);
 182   finished_spanner_ = 0;
 183 }
 184
 185 void
 186 New_dynamic_engraver::acknowledge_note_column (Grob_info info)
 187 {
 188   if (script_ && !script_->get_parent (X_AXIS))
 189     {
 190       extract_grob_set (info.grob (), "note-heads", heads);
 191       if (heads.size ())
 192         {
 193           Grob *head = heads[0];
 194           script_->set_parent (head, X_AXIS);
 195           Self_alignment_interface::set_center_parent (script_, X_AXIS);
 196         }
 197     }
 198
 199   if (current_spanner_ && !current_spanner_->get_bound (LEFT))
 200     current_spanner_->set_bound (LEFT, info.grob ());
 201   if (finished_spanner_ && !finished_spanner_->get_bound (RIGHT))
 202     finished_spanner_->set_bound (RIGHT, info.grob ());
 203 }
 204
 205 ADD_ACKNOWLEDGER (New_dynamic_engraver, note_column);
 206 ADD_TRANSLATOR (New_dynamic_engraver,
 207                 /* doc */
 208                 "Create hairpins, dynamic texts, and their vertical"
 209                 " alignments.  The symbols are collected onto a"
 210                 " @code{DynamicLineSpanner} grob which takes care of vertical"
 211                 " positioning.",
 212
 213                 /* create */
 214                 "DynamicTextSpanner "
 215                 "DynamicText "
 216                 "Hairpin "
 217                 "TextSpanner ",
 218
 219                 /* read */
 220                 "currentMusicalColumn ",
 221
 222                 /* write */
 223                 ""
 224                 );