lily/dynamic-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 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 "axis-group-interface.hh"
  21 #include "context.hh"
  22 #include "engraver.hh"
  23 #include "dimensions.hh"
  24 #include "directional-element-interface.hh"
  25 #include "engraver.hh"
  26 #include "hairpin.hh"
  27 #include "international.hh"
  28 #include "interval.hh"
  29 #include "note-column.hh"
  30 #include "paper-column.hh"
  31 #include "pointer-group-interface.hh"
  32 #include "script-interface.hh"
  33 #include "self-alignment-interface.hh"
  34 #include "side-position-interface.hh"
  35 #include "staff-symbol-referencer.hh"
  36 #include "stream-event.hh"
  37 #include "warn.hh"
  38 #include "spanner.hh"
  39 #include "text-interface.hh"
  40
  41 #include "translator.icc"
  42
  43 /*
  44   TODO:
  45
  46   * direction of text-dynamic-event if not equal to direction of
  47   line-spanner
  48
  49   - TODO: this engraver is too complicated. We should split it into
  50   the handling of the basic grobs and the linespanner
  51
  52   - TODO: the line-spanner is not killed after the (de)crescs are
  53   finished.
  54 */
  55
  56 /**
  57    print text & hairpin dynamics.
  58 */
  59 class Dynamic_engraver : public Engraver
  60 {
  61   Item *script_;
  62   Spanner *line_spanner_;
  63   Spanner *cresc_;
  64
  65   Spanner *finished_line_spanner_;
  66   Spanner *finished_cresc_;
  67
  68   Stream_event *script_ev_;
  69   Stream_event *current_cresc_ev_;
  70
  71   Drul_array<Stream_event *> accepted_spanevents_drul_;
  72
  73   vector<Note_column*> pending_columns_;
  74   vector<Grob*> pending_elements_;
  75
  76   void typeset_all ();
  77
  78   TRANSLATOR_DECLARATIONS (Dynamic_engraver);
  79   DECLARE_ACKNOWLEDGER (note_column);
  80   DECLARE_TRANSLATOR_LISTENER (absolute_dynamic);
  81   DECLARE_TRANSLATOR_LISTENER (span_dynamic);
  82
  83 protected:
  84   virtual void finalize ();
  85   void stop_translation_timestep ();
  86   void process_music ();
  87 };
  88
  89 Dynamic_engraver::Dynamic_engraver ()
  90 {
  91   script_ = 0;
  92   finished_cresc_ = 0;
  93   line_spanner_ = 0;
  94   finished_line_spanner_ = 0;
  95   current_cresc_ev_ = 0;
  96   cresc_ = 0;
  97
  98   script_ev_ = 0;
  99   accepted_spanevents_drul_[START] = 0;
 100   accepted_spanevents_drul_[STOP] = 0;
 101 }
 102
 103 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_engraver, absolute_dynamic);
 104 void
 105 Dynamic_engraver::listen_absolute_dynamic (Stream_event *ev)
 106 {
 107   /*
 108     TODO: probably broken.
 109   */
 110   ASSIGN_EVENT_ONCE (script_ev_, ev);
 111 }
 112
 113 IMPLEMENT_TRANSLATOR_LISTENER (Dynamic_engraver, span_dynamic);
 114 void
 115 Dynamic_engraver::listen_span_dynamic (Stream_event *ev)
 116 {
 117   Direction d = to_dir (ev->get_property ("span-direction"));
 118
 119   if (d == START)
 120     ASSIGN_EVENT_ONCE (accepted_spanevents_drul_[START], ev);
 121
 122   /* Cancel any ongoing crescendo, either explicitly by \! or
 123      implicitly by a new crescendo. Also avoid warning if cresc is
 124      cancelled both implicitly and explicitly. */
 125   if ((d == STOP || current_cresc_ev_) && !accepted_spanevents_drul_[STOP])
 126     ASSIGN_EVENT_ONCE (accepted_spanevents_drul_[STOP], ev);
 127 }
 128
 129 void
 130 Dynamic_engraver::process_music ()
 131 {
 132   if (accepted_spanevents_drul_[START] || accepted_spanevents_drul_[STOP] || script_ev_)
 133     {
 134       if (!line_spanner_)
 135         {
 136           Stream_event *rq = accepted_spanevents_drul_[START];
 137           line_spanner_ = make_spanner ("DynamicLineSpanner", rq ? rq->self_scm () : SCM_EOL);
 138           if (script_ev_)
 139             rq = script_ev_;
 140         }
 141     }
 142
 143   /*
 144     During a (de)crescendo, pending event will not be cleared,
 145     and a line-spanner will always be created, as \< \! are already
 146     two events.
 147
 148     Note: line-spanner must always have at least same duration
 149     as (de)crecsendo, b.o. line-breaking.
 150   */
 151
 152   /*
 153     maybe we should leave dynamic texts to the text-engraver and
 154     simply acknowledge them?
 155   */
 156   if (script_ev_)
 157     {
 158       script_ = make_item ("DynamicText", script_ev_->self_scm ());
 159       script_->set_property ("text",
 160                              script_ev_->get_property ("text"));
 161
 162       if (Direction d = to_dir (script_ev_->get_property ("direction")))
 163         set_grob_direction (line_spanner_, d);
 164       else if (Direction d = to_dir (line_spanner_->get_property ("direction")))
 165         set_grob_direction (script_, d);
 166
 167       Axis_group_interface::add_element (line_spanner_, script_);
 168     }
 169
 170   Stream_event *stop_ev = accepted_spanevents_drul_ [STOP]
 171     ? accepted_spanevents_drul_[STOP] : script_ev_;
 172
 173   if (accepted_spanevents_drul_[STOP] || script_ev_)
 174     {
 175       /*
 176         finish side position alignment if the (de)cresc ends here, and
 177         there are no new dynamics.
 178       */
 179
 180       if (cresc_)
 181         {
 182           assert (!finished_cresc_ && cresc_);
 183
 184           if (script_)
 185             {
 186               cresc_->set_bound (RIGHT, script_);
 187               add_bound_item (line_spanner_, script_);
 188             }
 189
 190           finished_cresc_ = cresc_;
 191           announce_end_grob (finished_cresc_, SCM_EOL);
 192           cresc_ = 0;
 193           current_cresc_ev_ = 0;
 194         }
 195       else if (accepted_spanevents_drul_[STOP])
 196         {
 197           accepted_spanevents_drul_[STOP]->origin ()->warning (_ ("cannot find start of (de)crescendo"));
 198           stop_ev = 0;
 199         }
 200     }
 201
 202   if (accepted_spanevents_drul_[START])
 203     {
 204       if (current_cresc_ev_)
 205         {
 206           string msg = _ ("already have a decrescendo");
 207           if (current_cresc_ev_->in_event_class ("crescendo-event"))
 208             msg = _ ("already have a crescendo");
 209
 210           accepted_spanevents_drul_[START]->origin ()->warning (msg);
 211           current_cresc_ev_->origin ()->warning (_ ("cresc starts here"));
 212         }
 213       else
 214         {
 215           current_cresc_ev_ = accepted_spanevents_drul_[START];
 216
 217           if (Direction d = to_dir (current_cresc_ev_->get_property ("direction")))
 218             set_grob_direction (line_spanner_, d);
 219
 220           /*
 221             TODO: Use symbols.
 222           */
 223
 224           SCM start_sym = current_cresc_ev_->get_property ("class");
 225           string start_type;
 226
 227           if (start_sym == ly_symbol2scm ("decrescendo-event"))
 228             start_type = "decrescendo";
 229           else if (start_sym == ly_symbol2scm ("crescendo-event"))
 230             start_type = "crescendo";
 231           else
 232             {
 233               programming_error ("unknown dynamic spanner type");
 234               return;
 235             }
 236
 237           /*
 238             UGH. TODO: should read from original event, so appearance
 239             may be altered with \tweak.
 240            */
 241           SCM s = get_property ((start_type + "Spanner").c_str ());
 242           if (!scm_is_symbol (s) || s == ly_symbol2scm ("hairpin"))
 243             {
 244               cresc_ = make_spanner ("Hairpin", accepted_spanevents_drul_[START]->self_scm ());
 245               if (finished_cresc_)
 246                 {
 247                   Pointer_group_interface::add_grob (finished_cresc_,
 248                                                      ly_symbol2scm ("adjacent-hairpins"),
 249                                                      cresc_);
 250
 251                   Pointer_group_interface::add_grob (cresc_,
 252                                                      ly_symbol2scm ("adjacent-hairpins"),
 253                                                      finished_cresc_);
 254                 }
 255             }
 256
 257           /*
 258             This is a convenient (and legacy) interface to TextSpanners
 259             for use in (de)crescendi.
 260             Hmm.
 261           */
 262           else
 263             {
 264               cresc_ = make_spanner ("DynamicTextSpanner", accepted_spanevents_drul_[START]->self_scm ());
 265               cresc_->set_property ("style", s);
 266               context ()->set_property ((start_type
 267                                          + "Spanner").c_str (), SCM_EOL);
 268               s = get_property ((start_type + "Text").c_str ());
 269               if (Text_interface::is_markup (s))
 270                 {
 271                   cresc_->set_property ("text", s);
 272                   context ()->set_property ((start_type + "Text").c_str (),
 273                                             SCM_EOL);
 274                 }
 275
 276               if (script_)
 277                 {
 278                   set_nested_property (cresc_,
 279                                        scm_list_3 (ly_symbol2scm ("bound-details"),
 280                                                    ly_symbol2scm ("left"),
 281                                                    ly_symbol2scm ("attach-dir")
 282                                                    ),
 283                                        scm_from_int (RIGHT));
 284                 }
 285             }
 286
 287           if (script_)
 288             {
 289               cresc_->set_bound (LEFT, script_);
 290               add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 291             }
 292           Axis_group_interface::add_element (line_spanner_, cresc_);
 293         }
 294     }
 295 }
 296
 297 void
 298 Dynamic_engraver::stop_translation_timestep ()
 299 {
 300   if (!current_cresc_ev_ && line_spanner_)
 301     {
 302       assert (!finished_line_spanner_);
 303       finished_line_spanner_ = line_spanner_;
 304       line_spanner_ = 0;
 305     }
 306
 307   typeset_all ();
 308
 309   if (cresc_ && !cresc_->get_bound (LEFT))
 310     {
 311       cresc_->set_bound (LEFT, unsmob_grob (get_property ("currentMusicalColumn")));
 312       add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 313     }
 314
 315   script_ev_ = 0;
 316   accepted_spanevents_drul_[START] = 0;
 317   accepted_spanevents_drul_[STOP] = 0;
 318 }
 319
 320 void
 321 Dynamic_engraver::finalize ()
 322 {
 323   typeset_all ();
 324
 325   if (line_spanner_
 326       && !line_spanner_->is_live ())
 327     line_spanner_ = 0;
 328   if (line_spanner_)
 329     {
 330       finished_line_spanner_ = line_spanner_;
 331       typeset_all ();
 332     }
 333
 334   if (cresc_
 335       && !cresc_->is_live ())
 336     cresc_ = 0;
 337   if (cresc_)
 338     {
 339       current_cresc_ev_->origin ()->warning (_ ("unterminated (de)crescendo"));
 340       cresc_->suicide ();
 341       cresc_ = 0;
 342     }
 343 }
 344
 345 void
 346 Dynamic_engraver::typeset_all ()
 347 {
 348   if (finished_cresc_)
 349     {
 350       if (!finished_cresc_->get_bound (RIGHT))
 351         {
 352
 353           Grob *column_bound = unsmob_grob (get_property ("currentMusicalColumn"));
 354
 355           finished_cresc_->set_bound (RIGHT, script_
 356                                       ? script_
 357                                       : column_bound);
 358
 359           if (finished_line_spanner_)
 360             add_bound_item (finished_line_spanner_,
 361                             finished_cresc_->get_bound (RIGHT));
 362         }
 363       finished_cresc_ = 0;
 364     }
 365
 366   script_ = 0;
 367   if (finished_line_spanner_)
 368     {
 369       /*
 370         We used to have
 371
 372         extend-spanner-over-elements (finished_line_spanner_);
 373
 374         but this is rather kludgy, since finished_line_spanner_
 375         typically has a staff-symbol field set , extending it over the
 376         entire staff.
 377
 378       */
 379
 380       Grob *l = finished_line_spanner_->get_bound (LEFT);
 381       Grob *r = finished_line_spanner_->get_bound (RIGHT);
 382       if (!r && l)
 383         finished_line_spanner_->set_bound (RIGHT, l);
 384       else if (!l && r)
 385         finished_line_spanner_->set_bound (LEFT, r);
 386       else if (!r && !l)
 387         {
 388           /*
 389             This is a isolated dynamic apparently, and does not even have
 390             any interesting support item.
 391           */
 392           Grob *cc = unsmob_grob (get_property ("currentMusicalColumn"));
 393           Item *ci = dynamic_cast<Item *> (cc);
 394           finished_line_spanner_->set_bound (RIGHT, ci);
 395           finished_line_spanner_->set_bound (LEFT, ci);
 396         }
 397       finished_line_spanner_ = 0;
 398     }
 399 }
 400
 401 void
 402 Dynamic_engraver::acknowledge_note_column (Grob_info info)
 403 {
 404   if (!line_spanner_)
 405     return;
 406
 407   if (line_spanner_
 408       /* Don't refill killed spanner */
 409       && line_spanner_->is_live ())
 410     {
 411       Side_position_interface::add_support (line_spanner_, info.grob ());
 412       add_bound_item (line_spanner_, dynamic_cast<Item *> (info.grob ()));
 413     }
 414
 415   if (script_ && !script_->get_parent (X_AXIS))
 416     {
 417       extract_grob_set (info.grob (), "note-heads", heads);
 418       if (heads.size ())
 419         {
 420           Grob *head = heads[0];
 421           script_->set_parent (head, X_AXIS);
 422           Self_alignment_interface::set_center_parent (script_, X_AXIS);
 423         }
 424     }
 425
 426   if (cresc_)
 427     {
 428       if (!cresc_->get_bound (LEFT))
 429         {
 430           cresc_->set_bound (LEFT, info.grob ());
 431           add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 432         }
 433     }
 434
 435   if (finished_cresc_ && !finished_cresc_->get_bound (RIGHT))
 436     finished_cresc_->set_bound (RIGHT, info.grob ());
 437 }
 438
 439 ADD_ACKNOWLEDGER (Dynamic_engraver, note_column);
 440
 441 ADD_TRANSLATOR (Dynamic_engraver,
 442                 /* doc */
 443                 "Create hairpins, dynamic texts, and their vertical"
 444                 " alignments.  The symbols are collected onto a"
 445                 " @code{DynamicLineSpanner} grob which takes care of vertical"
 446                 " positioning.",
 447
 448                 /* create */
 449                 "DynamicLineSpanner "
 450                 "DynamicTextSpanner "
 451                 "DynamicText "
 452                 "Hairpin ",
 453
 454                 /* read */
 455                 "",
 456
 457                 /* write */
 458                 ""
 459                 );