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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include "warn.hh"
   9 #include "dimensions.hh"
  10 #include "hairpin.hh"
  11 #include "event.hh"
  12 #include "paper-column.hh"
  13 #include "note-column.hh"
  14 #include "item.hh"
  15 #include "side-position-interface.hh"
  16 #include "engraver.hh"
  17 #include "group-interface.hh"
  18 #include "directional-element-interface.hh"
  19 #include "context.hh"
  20 #include "axis-group-interface.hh"
  21 #include "script.hh"
  22
  23 /*
  24   TODO:
  25
  26   * direction of text-dynamic-event if not equal to direction of
  27   line-spanner
  28
  29   - TODO: this engraver is too complicated. We should split it into
  30   the handling of the basic grobs and the  linespanner
  31
  32   - TODO: the line-spanner is not killed after the (de)crescs are
  33   finished.
  34
  35 */
  36
  37 /**
  38    print text & hairpin dynamics.
  39  */
  40 class Dynamic_engraver : public Engraver
  41 {
  42   Item * script_;
  43   Spanner * finished_cresc_;
  44   Spanner * cresc_;
  45
  46   Music* script_ev_;
  47
  48   Music * current_cresc_ev_;
  49   Drul_array<Music*> accepted_spanreqs_drul_;
  50
  51   Spanner* line_spanner_;
  52   Spanner* finished_line_spanner_;
  53
  54   Link_array<Note_column> pending_columns_;
  55   Link_array<Grob> pending_elements_;
  56
  57   void typeset_all ();
  58
  59   TRANSLATOR_DECLARATIONS (Dynamic_engraver);
  60
  61 protected:
  62   virtual void finalize ();
  63   virtual void acknowledge_grob (Grob_info);
  64   virtual bool try_music (Music *req);
  65   virtual void stop_translation_timestep ();
  66   virtual void process_music ();
  67 };
  68
  69
  70
  71
  72 Dynamic_engraver::Dynamic_engraver ()
  73 {
  74   script_ = 0;
  75   finished_cresc_ = 0;
  76   line_spanner_ = 0;
  77   finished_line_spanner_ = 0;
  78   current_cresc_ev_ = 0;
  79   cresc_ =0;
  80
  81   script_ev_ = 0;
  82   accepted_spanreqs_drul_[START] = 0;
  83   accepted_spanreqs_drul_[STOP] = 0;
  84 }
  85
  86 bool
  87 Dynamic_engraver::try_music (Music * m)
  88 {
  89   if (m->is_mus_type ("absolute-dynamic-event"))
  90     {
  91       /*
  92         TODO: probably broken.
  93       */
  94       script_ev_ = m;
  95       return true;
  96     }
  97   else if (m->is_mus_type ("decrescendo-event")
  98            || m->is_mus_type ("crescendo-event"))
  99     {
 100       Direction d = to_dir (m->get_property ("span-direction"));
 101
 102       accepted_spanreqs_drul_[d] = m;
 103       if (current_cresc_ev_ && d == START)
 104         accepted_spanreqs_drul_[STOP] = m;
 105       return true;
 106     }
 107   return false;
 108 }
 109
 110 void
 111 Dynamic_engraver::process_music ()
 112 {
 113   if (accepted_spanreqs_drul_[START] || accepted_spanreqs_drul_[STOP] || script_ev_)
 114     {
 115       if (!line_spanner_)
 116         {
 117           line_spanner_ = make_spanner ("DynamicLineSpanner");
 118
 119           Music * rq = accepted_spanreqs_drul_[START];
 120           if (script_ev_)
 121             rq =  script_ev_ ;
 122           announce_grob (line_spanner_, rq ? rq->self_scm (): SCM_EOL);
 123         }
 124     }
 125
 126   /*
 127     During a (de)crescendo, pending event will not be cleared,
 128     and a line-spanner will always be created, as \< \! are already
 129     two events.
 130
 131     Note: line-spanner must always have at least same duration
 132     as (de)crecsendo, b.o. line-breaking.
 133   */
 134
 135
 136
 137   /*
 138     maybe we should leave dynamic texts to the text-engraver and
 139     simply acknowledge them?
 140   */
 141   if (script_ev_)
 142     {
 143       script_ = make_item ("DynamicText");
 144       script_->set_property ("text",
 145                                    script_ev_->get_property ("text"));
 146
 147
 148       if (Direction d = to_dir (script_ev_->get_property ("direction")))
 149         set_grob_direction (line_spanner_, d);
 150
 151       Axis_group_interface::add_element (line_spanner_, script_);
 152
 153       announce_grob (script_, script_ev_->self_scm ());
 154     }
 155
 156   Music *stop_ev = accepted_spanreqs_drul_ [STOP] ?
 157     accepted_spanreqs_drul_[STOP] : script_ev_;
 158
 159   if (accepted_spanreqs_drul_[STOP] || script_ev_)
 160     {
 161       /*
 162         finish side position alignment if the (de)cresc ends here, and
 163         there are no new dynamics.
 164        */
 165
 166
 167       if (cresc_)
 168         {
 169           assert (!finished_cresc_ && cresc_);
 170
 171           cresc_->set_bound (RIGHT, script_
 172                                ? script_
 173                                : unsmob_grob (get_property ("currentMusicalColumn")));
 174           add_bound_item (line_spanner_, cresc_->get_bound (RIGHT));
 175
 176
 177           finished_cresc_ = cresc_;
 178           cresc_ = 0;
 179           current_cresc_ev_ = 0;
 180         }
 181       else if (accepted_spanreqs_drul_[STOP])
 182         {
 183           accepted_spanreqs_drul_[STOP]->origin ()->warning (_ ("can't find start of (de)crescendo"));
 184           stop_ev = 0;
 185         }
 186
 187     }
 188
 189   if (accepted_spanreqs_drul_[START])
 190     {
 191       if (current_cresc_ev_)
 192         {
 193           String msg = _ ("already have a decrescendo");
 194           if (current_cresc_ev_->is_mus_type ("decrescendo-event"))
 195             msg = _ ("already have a crescendo");
 196
 197           accepted_spanreqs_drul_[START]->origin ()->warning (msg);
 198           current_cresc_ev_->origin ()->warning (_("Cresc started here"));
 199         }
 200       else
 201         {
 202           current_cresc_ev_ = accepted_spanreqs_drul_[START];
 203
 204           if (Direction d = to_dir (current_cresc_ev_->get_property ("direction")))
 205             set_grob_direction (line_spanner_, d);
 206
 207           /*
 208             TODO: Use symbols.
 209           */
 210
 211           String start_type =
 212             ly_symbol2string (current_cresc_ev_->get_property ("name"));
 213
 214           /*
 215             ugh. Use push/pop?
 216           */
 217           if (start_type == "DecrescendoEvent")
 218             start_type = "decrescendo";
 219           else if (start_type == "CrescendoEvent")
 220             start_type = "crescendo";
 221
 222           SCM s = get_property ((start_type + "Spanner").to_str0 ());
 223           if (!gh_symbol_p (s) || s == ly_symbol2scm ("hairpin"))
 224             {
 225               cresc_  = make_spanner ("Hairpin");
 226               cresc_->set_property ("grow-direction",
 227                                            gh_int2scm ((start_type == "crescendo")
 228                                                        ? BIGGER : SMALLER));
 229
 230             }
 231
 232
 233           /*
 234             This is a convenient (and legacy) interface to TextSpanners
 235             for use in (de)crescendi.
 236             Hmm.
 237           */
 238           else
 239             {
 240               cresc_  = make_spanner ("TextSpanner");
 241               cresc_->set_property ("style", s);
 242               daddy_context_->set_property ((start_type
 243                                             + "Spanner").to_str0 (), SCM_EOL);
 244               s = get_property ((start_type + "Text").to_str0 ());
 245               /*
 246                 FIXME: use get_markup () to check type.
 247               */
 248               if (gh_string_p (s) || gh_pair_p (s))
 249                 {
 250                   cresc_->set_property ("edge-text",
 251                                              gh_cons (s, scm_makfrom0str ("")));
 252                   daddy_context_->set_property ((start_type + "Text").to_str0 (),
 253                                                 SCM_EOL);
 254                 }
 255             }
 256
 257           cresc_->set_bound (LEFT, script_
 258                                ? script_
 259                                : unsmob_grob (get_property ("currentMusicalColumn")));
 260
 261           Axis_group_interface::add_element (line_spanner_, cresc_);
 262
 263           add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 264
 265           announce_grob (cresc_, accepted_spanreqs_drul_[START]->self_scm ());
 266         }
 267     }
 268 }
 269
 270 void
 271 Dynamic_engraver::stop_translation_timestep ()
 272 {
 273   typeset_all ();
 274   if (!current_cresc_ev_)
 275     {
 276       finished_line_spanner_ = line_spanner_;
 277       line_spanner_ =0;
 278       typeset_all ();
 279     }
 280
 281   script_ev_ = 0;
 282   accepted_spanreqs_drul_[START] = 0;
 283   accepted_spanreqs_drul_[STOP] = 0;
 284 }
 285
 286 void
 287 Dynamic_engraver::finalize ()
 288 {
 289   typeset_all ();
 290
 291   if (line_spanner_
 292       && !line_spanner_->live ())
 293     line_spanner_ = 0;
 294   if (line_spanner_)
 295     {
 296       finished_line_spanner_ = line_spanner_;
 297       typeset_all ();
 298     }
 299
 300   if (cresc_
 301       && !cresc_->live ())
 302     cresc_ = 0;
 303   if (cresc_)
 304     {
 305       current_cresc_ev_->origin ()->warning (_ ("unterminated (de)crescendo"));
 306       cresc_->suicide ();
 307       cresc_ = 0;
 308     }
 309 }
 310
 311 void
 312 Dynamic_engraver::typeset_all ()
 313 {
 314   /*
 315     remove suicided spanners,
 316     ugh: we'll need this for every spanner, beam, slur
 317     Hmm, how to do this, cleanly?
 318     Maybe just check at typeset_grob ()?
 319   */
 320   if (finished_cresc_
 321       && !finished_cresc_->live ())
 322     finished_cresc_ = 0;
 323   if (finished_line_spanner_
 324       && !finished_line_spanner_->live ())
 325     finished_line_spanner_ = 0;
 326
 327   if (finished_cresc_)
 328     {
 329       if (!finished_cresc_->get_bound (RIGHT))
 330         {
 331           finished_cresc_->set_bound (RIGHT, script_
 332                                         ? script_
 333                                         : unsmob_grob (get_property ("currentMusicalColumn")));
 334
 335           if (finished_line_spanner_)
 336             add_bound_item (finished_line_spanner_,
 337                             finished_cresc_->get_bound (RIGHT));
 338         }
 339       typeset_grob (finished_cresc_);
 340       finished_cresc_ =0;
 341     }
 342
 343   if (script_)
 344     {
 345       typeset_grob (script_);
 346       script_ = 0;
 347     }
 348   if (finished_line_spanner_)
 349     {
 350       /*
 351         We used to have
 352
 353              extend-spanner-over-elements (finished_line_spanner_);
 354
 355         but this is rather kludgy, since finished_line_spanner_
 356         typically has a staff-symbol field set , extending it over the
 357         entire staff.
 358
 359       */
 360
 361       Grob * l = finished_line_spanner_->get_bound (LEFT );
 362       Grob * r = finished_line_spanner_->get_bound (RIGHT);
 363       if (!r && l)
 364         finished_line_spanner_->set_bound (RIGHT, l);
 365       else if (!l && r)
 366         finished_line_spanner_->set_bound (LEFT, r);
 367       else if (!r && !l)
 368         {
 369           /*
 370             This is a isolated dynamic apparently, and does not even have
 371             any interesting support item.
 372            */
 373           Grob * cc = unsmob_grob (get_property ("currentMusicalColumn"));
 374           Item * ci = dynamic_cast<Item*>(cc);
 375           finished_line_spanner_->set_bound (RIGHT, ci);
 376           finished_line_spanner_->set_bound (LEFT, ci);
 377         }
 378
 379       typeset_grob (finished_line_spanner_);
 380       finished_line_spanner_ = 0;
 381     }
 382 }
 383
 384 void
 385 Dynamic_engraver::acknowledge_grob (Grob_info i)
 386 {
 387   if (!line_spanner_)
 388     return ;
 389
 390   if (Note_column::has_interface (i.grob_))
 391     {
 392       if (line_spanner_
 393           /* Don't refill killed spanner */
 394           && line_spanner_->live ())
 395         {
 396           Side_position_interface::add_support (line_spanner_,i.grob_);
 397           add_bound_item (line_spanner_,dynamic_cast<Item*> (i.grob_));
 398         }
 399
 400       if (script_ && !script_->get_parent (X_AXIS))
 401         {
 402           SCM head = scm_last_pair (i.grob_->get_property ("note-heads"));
 403           if (gh_pair_p (head))
 404             script_->set_parent (unsmob_grob (gh_car (head)),  X_AXIS);
 405         }
 406
 407     }
 408   else if (Script_interface::has_interface (i.grob_) && script_)
 409     {
 410       SCM p = i.grob_->get_property ("script-priority");
 411
 412       /*
 413         UGH.
 414
 415         DynamicText doesn't really have a script-priority field.
 416        */
 417       if (gh_number_p (p)
 418           && gh_scm2int (p) < gh_scm2int (script_->get_property ("script-priority")))
 419         {
 420           Side_position_interface::add_support (line_spanner_, i.grob_);
 421
 422         }
 423     }
 424 }
 425 ENTER_DESCRIPTION (Dynamic_engraver,
 426 /* descr */
 427 "This engraver creates hairpins, dynamic texts, and their vertical\n"
 428 "alignments.  The symbols are collected onto a DynamicLineSpanner grob\n"
 429 "which takes care of vertical positioning.  "
 430 ,
 431
 432 /* creats*/       "DynamicLineSpanner DynamicText Hairpin TextSpanner",
 433 /* accepts */     "absolute-dynamic-event crescendo-event decrescendo-event",
 434 /* acks  */      "note-column-interface script-interface",
 435 /* reads */       "",
 436 /* write */       "");