lily/dynamic-engraver.cc

   1 /*
   2   dynamic-engraver.cc -- implement Dynamic_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "axis-group-interface.hh"
  10 #include "context.hh"
  11 #include "dimensions.hh"
  12 #include "directional-element-interface.hh"
  13 #include "engraver.hh"
  14 #include "hairpin.hh"
  15 #include "interval.hh"
  16 #include "note-column.hh"
  17 #include "paper-column.hh"
  18 #include "script-interface.hh"
  19 #include "side-position-interface.hh"
  20 #include "staff-symbol-referencer.hh"
  21 #include "warn.hh"
  22 #include "self-alignment-interface.hh"
  23 #include "pointer-group-interface.hh"
  24
  25 #include "translator.icc"
  26
  27 /*
  28   TODO:
  29
  30   * direction of text-dynamic-event if not equal to direction of
  31   line-spanner
  32
  33   - TODO: this engraver is too complicated. We should split it into
  34   the handling of the basic grobs and the linespanner
  35
  36   - TODO: the line-spanner is not killed after the (de)crescs are
  37   finished.
  38 */
  39
  40 /**
  41    print text & hairpin dynamics.
  42 */
  43 class Dynamic_engraver : public Engraver
  44 {
  45   Item *script_;
  46   Spanner *line_spanner_;
  47   Spanner *cresc_;
  48
  49   Spanner *finished_line_spanner_;
  50   Spanner *finished_cresc_;
  51
  52   Music *script_ev_;
  53   Music *current_cresc_ev_;
  54
  55   Drul_array<Music *> accepted_spanevents_drul_;
  56
  57   Link_array<Note_column> pending_columns_;
  58   Link_array<Grob> pending_elements_;
  59
  60   void typeset_all ();
  61
  62   TRANSLATOR_DECLARATIONS (Dynamic_engraver);
  63   DECLARE_ACKNOWLEDGER (script);
  64   DECLARE_ACKNOWLEDGER (note_column);
  65   DECLARE_ACKNOWLEDGER (slur);
  66
  67
  68 protected:
  69   virtual void finalize ();
  70   virtual bool try_music (Music *event);
  71   void stop_translation_timestep ();
  72   void process_music ();
  73 };
  74
  75 Dynamic_engraver::Dynamic_engraver ()
  76 {
  77   script_ = 0;
  78   finished_cresc_ = 0;
  79   line_spanner_ = 0;
  80   finished_line_spanner_ = 0;
  81   current_cresc_ev_ = 0;
  82   cresc_ = 0;
  83
  84   script_ev_ = 0;
  85   accepted_spanevents_drul_[START] = 0;
  86   accepted_spanevents_drul_[STOP] = 0;
  87 }
  88
  89 bool
  90 Dynamic_engraver::try_music (Music *m)
  91 {
  92   if (m->is_mus_type ("absolute-dynamic-event"))
  93     {
  94       /*
  95         TODO: probably broken.
  96       */
  97       script_ev_ = m;
  98       return true;
  99     }
 100   else if (m->is_mus_type ("decrescendo-event")
 101            || m->is_mus_type ("crescendo-event"))
 102     {
 103       Direction d = to_dir (m->get_property ("span-direction"));
 104
 105       accepted_spanevents_drul_[d] = m;
 106       if (current_cresc_ev_ && d == START)
 107         accepted_spanevents_drul_[STOP] = m;
 108       return true;
 109     }
 110   return false;
 111 }
 112
 113 void
 114 Dynamic_engraver::process_music ()
 115 {
 116   if (accepted_spanevents_drul_[START] || accepted_spanevents_drul_[STOP] || script_ev_)
 117     {
 118       if (!line_spanner_)
 119         {
 120           Music *rq = accepted_spanevents_drul_[START];
 121           line_spanner_ = make_spanner ("DynamicLineSpanner", rq ? rq->self_scm () : SCM_EOL);
 122           if (script_ev_)
 123             rq = script_ev_;
 124         }
 125     }
 126
 127   /*
 128     During a (de)crescendo, pending event will not be cleared,
 129     and a line-spanner will always be created, as \< \! are already
 130     two events.
 131
 132     Note: line-spanner must always have at least same duration
 133     as (de)crecsendo, b.o. line-breaking.
 134   */
 135
 136   /*
 137     maybe we should leave dynamic texts to the text-engraver and
 138     simply acknowledge them?
 139   */
 140   if (script_ev_)
 141     {
 142       script_ = make_item ("DynamicText", script_ev_->self_scm ());
 143       script_->set_property ("text",
 144                              script_ev_->get_property ("text"));
 145
 146       if (Direction d = to_dir (script_ev_->get_property ("direction")))
 147         set_grob_direction (line_spanner_, d);
 148       else if (Direction d = to_dir (line_spanner_->get_property ("direction")))
 149         set_grob_direction (script_, d);
 150
 151       Axis_group_interface::add_element (line_spanner_, script_);
 152     }
 153
 154   Music *stop_ev = accepted_spanevents_drul_ [STOP]
 155     ? accepted_spanevents_drul_[STOP] : script_ev_;
 156
 157   if (accepted_spanevents_drul_[STOP] || script_ev_)
 158     {
 159       /*
 160         finish side position alignment if the (de)cresc ends here, and
 161         there are no new dynamics.
 162       */
 163
 164       if (cresc_)
 165         {
 166           assert (!finished_cresc_ && cresc_);
 167
 168           if (script_)
 169             {
 170               cresc_->set_bound (RIGHT, script_);
 171               add_bound_item (line_spanner_, script_);
 172             }
 173
 174           finished_cresc_ = cresc_;
 175           cresc_ = 0;
 176           current_cresc_ev_ = 0;
 177         }
 178       else if (accepted_spanevents_drul_[STOP])
 179         {
 180           accepted_spanevents_drul_[STOP]->origin ()->warning (_ ("can't find start of (de)crescendo"));
 181           stop_ev = 0;
 182         }
 183     }
 184
 185   if (accepted_spanevents_drul_[START])
 186     {
 187       if (current_cresc_ev_)
 188         {
 189           String msg = _ ("already have a decrescendo");
 190           if (current_cresc_ev_->is_mus_type ("decrescendo-event"))
 191             msg = _ ("already have a crescendo");
 192
 193           accepted_spanevents_drul_[START]->origin ()->warning (msg);
 194           current_cresc_ev_->origin ()->warning (_ ("cresc starts here"));
 195         }
 196       else
 197         {
 198           current_cresc_ev_ = accepted_spanevents_drul_[START];
 199
 200           if (Direction d = to_dir (current_cresc_ev_->get_property ("direction")))
 201             set_grob_direction (line_spanner_, d);
 202
 203           /*
 204             TODO: Use symbols.
 205           */
 206
 207           String start_type
 208             = ly_symbol2string (current_cresc_ev_->get_property ("name"));
 209
 210           /*
 211             ugh. Use push/pop?
 212           */
 213           if (start_type == "DecrescendoEvent")
 214             start_type = "decrescendo";
 215           else if (start_type == "CrescendoEvent")
 216             start_type = "crescendo";
 217
 218           SCM s = get_property ((start_type + "Spanner").to_str0 ());
 219           if (!scm_is_symbol (s) || s == ly_symbol2scm ("hairpin"))
 220             {
 221               cresc_ = make_spanner ("Hairpin", accepted_spanevents_drul_[START]->self_scm ());
 222               if (finished_cresc_)
 223                 {
 224                   Pointer_group_interface::add_grob (finished_cresc_,
 225                                                      ly_symbol2scm ("adjacent-hairpins"),
 226                                                      cresc_);
 227
 228                   Pointer_group_interface::add_grob (cresc_,
 229                                                      ly_symbol2scm ("adjacent-hairpins"),
 230                                                      finished_cresc_);
 231                 }
 232               cresc_->set_property ("grow-direction",
 233                                     scm_from_int ((start_type == "crescendo")
 234                                                  ? BIGGER : SMALLER));
 235             }
 236
 237           /*
 238             This is a convenient (and legacy) interface to TextSpanners
 239             for use in (de)crescendi.
 240             Hmm.
 241           */
 242           else
 243             {
 244               cresc_ = make_spanner ("DynamicTextSpanner", accepted_spanevents_drul_[START]->self_scm ());
 245               cresc_->set_property ("style", s);
 246               context ()->set_property ((start_type
 247                                          + "Spanner").to_str0 (), SCM_EOL);
 248               s = get_property ((start_type + "Text").to_str0 ());
 249               /*
 250                 FIXME: use get_markup () to check type.
 251               */
 252               if (scm_is_string (s) || scm_is_pair (s))
 253                 {
 254                   cresc_->set_property ("edge-text",
 255                                         scm_cons (s, scm_makfrom0str ("")));
 256                   context ()->set_property ((start_type + "Text").to_str0 (),
 257                                             SCM_EOL);
 258                 }
 259             }
 260
 261           if (script_)
 262             {
 263               cresc_->set_bound (LEFT, script_);
 264               add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 265             }
 266
 267           Axis_group_interface::add_element (line_spanner_, cresc_);
 268         }
 269     }
 270 }
 271
 272 void
 273 Dynamic_engraver::stop_translation_timestep ()
 274 {
 275   if (!current_cresc_ev_ && line_spanner_)
 276     {
 277       assert (!finished_line_spanner_);
 278       finished_line_spanner_ = line_spanner_;
 279       line_spanner_ = 0;
 280     }
 281
 282   typeset_all ();
 283
 284   if (cresc_ && !cresc_->get_bound (LEFT))
 285     {
 286       cresc_->set_bound (LEFT, unsmob_grob (get_property ("currentMusicalColumn")));
 287       add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 288     }
 289
 290   script_ev_ = 0;
 291   accepted_spanevents_drul_[START] = 0;
 292   accepted_spanevents_drul_[STOP] = 0;
 293 }
 294
 295 void
 296 Dynamic_engraver::finalize ()
 297 {
 298   typeset_all ();
 299
 300   if (line_spanner_
 301       && !line_spanner_->is_live ())
 302     line_spanner_ = 0;
 303   if (line_spanner_)
 304     {
 305       finished_line_spanner_ = line_spanner_;
 306       typeset_all ();
 307     }
 308
 309   if (cresc_
 310       && !cresc_->is_live ())
 311     cresc_ = 0;
 312   if (cresc_)
 313     {
 314       current_cresc_ev_->origin ()->warning (_ ("unterminated (de)crescendo"));
 315       cresc_->suicide ();
 316       cresc_ = 0;
 317     }
 318 }
 319
 320 void
 321 Dynamic_engraver::typeset_all ()
 322 {
 323   if (finished_cresc_)
 324     {
 325       if (!finished_cresc_->get_bound (RIGHT))
 326         {
 327           finished_cresc_->set_bound (RIGHT, script_
 328                                       ? script_
 329                                       : unsmob_grob (get_property ("currentMusicalColumn")));
 330
 331           if (finished_line_spanner_)
 332             add_bound_item (finished_line_spanner_,
 333                             finished_cresc_->get_bound (RIGHT));
 334         }
 335       finished_cresc_ = 0;
 336     }
 337
 338   script_ = 0;
 339   if (finished_line_spanner_)
 340     {
 341       /*
 342         We used to have
 343
 344         extend-spanner-over-elements (finished_line_spanner_);
 345
 346         but this is rather kludgy, since finished_line_spanner_
 347         typically has a staff-symbol field set , extending it over the
 348         entire staff.
 349
 350       */
 351
 352       Grob *l = finished_line_spanner_->get_bound (LEFT);
 353       Grob *r = finished_line_spanner_->get_bound (RIGHT);
 354       if (!r && l)
 355         finished_line_spanner_->set_bound (RIGHT, l);
 356       else if (!l && r)
 357         finished_line_spanner_->set_bound (LEFT, r);
 358       else if (!r && !l)
 359         {
 360           /*
 361             This is a isolated dynamic apparently, and does not even have
 362             any interesting support item.
 363           */
 364           Grob *cc = unsmob_grob (get_property ("currentMusicalColumn"));
 365           Item *ci = dynamic_cast<Item *> (cc);
 366           finished_line_spanner_->set_bound (RIGHT, ci);
 367           finished_line_spanner_->set_bound (LEFT, ci);
 368         }
 369
 370       finished_line_spanner_ = 0;
 371     }
 372 }
 373
 374 void
 375 Dynamic_engraver::acknowledge_slur (Grob_info info)
 376 {
 377   if (line_spanner_)
 378     {
 379       Side_position_interface::add_support (line_spanner_, info.grob ());
 380     }
 381 }
 382
 383 void
 384 Dynamic_engraver::acknowledge_note_column (Grob_info info)
 385 {
 386   if (!line_spanner_)
 387     return;
 388
 389   if (line_spanner_
 390       /* Don't refill killed spanner */
 391       && line_spanner_->is_live ())
 392     {
 393       Side_position_interface::add_support (line_spanner_, info.grob ());
 394       add_bound_item (line_spanner_, dynamic_cast<Item *> (info.grob ()));
 395     }
 396
 397   if (script_ && !script_->get_parent (X_AXIS))
 398     {
 399       extract_grob_set (info.grob (), "note-heads", heads);
 400       if (heads.size())
 401         {
 402           Grob *head = heads[0];
 403           script_->set_parent (head, X_AXIS);
 404           script_->add_offset_callback (Self_alignment_interface::centered_on_parent_proc,
 405                                         X_AXIS);
 406
 407         }
 408     }
 409
 410   if (cresc_)
 411     {
 412       if (!cresc_->get_bound (LEFT))
 413         {
 414           cresc_->set_bound (LEFT, info.grob ());
 415           add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 416         }
 417     }
 418
 419   if (finished_cresc_ && !finished_cresc_->get_bound (RIGHT))
 420     {
 421       finished_cresc_->set_bound (RIGHT, info.grob ());
 422     }
 423 }
 424
 425 void
 426 Dynamic_engraver::acknowledge_script (Grob_info info)
 427 {
 428   if (!line_spanner_ || !script_)
 429     return;
 430
 431   SCM p = info.grob ()->get_property ("script-priority");
 432
 433   /*
 434     UGH.
 435
 436     DynamicText doesn't really have a script-priority field.
 437   */
 438   if (scm_is_number (p)
 439       && scm_to_int (p)
 440       < scm_to_int (script_->get_property ("script-priority")))
 441     Side_position_interface::add_support (line_spanner_, info.grob ());
 442 }
 443
 444 ADD_ACKNOWLEDGER (Dynamic_engraver, script);
 445 ADD_ACKNOWLEDGER (Dynamic_engraver, note_column);
 446 ADD_ACKNOWLEDGER (Dynamic_engraver, slur);
 447
 448 ADD_TRANSLATOR (Dynamic_engraver,
 449                 /* descr */
 450                 "This engraver creates hairpins, dynamic texts, and their vertical\n"
 451                 "alignments.  The symbols are collected onto a DynamicLineSpanner grob\n"
 452                 "which takes care of vertical positioning.  ",
 453
 454                 /* creats*/ "DynamicLineSpanner DynamicText Hairpin TextSpanner",
 455                 /* accepts */ "absolute-dynamic-event crescendo-event decrescendo-event",
 456                 /* reads */ "",
 457                 /* write */ "");