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--2003 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 "translator-group.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   virtual void start_translation_timestep ();
  68 };
  69
  70
  71
  72
  73 Dynamic_engraver::Dynamic_engraver ()
  74 {
  75   script_ = 0;
  76   finished_cresc_ = 0;
  77   line_spanner_ = 0;
  78   finished_line_spanner_ = 0;
  79   current_cresc_ev_ = 0;
  80   cresc_ =0;
  81
  82   script_ev_ = 0;
  83   accepted_spanreqs_drul_[START] = 0;
  84   accepted_spanreqs_drul_[STOP] = 0;
  85 }
  86
  87 void
  88 Dynamic_engraver::start_translation_timestep ()
  89 {
  90   script_ev_ = 0;
  91   accepted_spanreqs_drul_[START] = 0;
  92   accepted_spanreqs_drul_[STOP] = 0;
  93 }
  94
  95 bool
  96 Dynamic_engraver::try_music (Music * m)
  97 {
  98   if (m->is_mus_type ("absolute-dynamic-event"))
  99     {
 100       /*
 101         TODO: probably broken.
 102       */
 103       script_ev_ = m;
 104       return true;
 105     }
 106   else if (m->is_mus_type ("abort-event"))
 107     {
 108       accepted_spanreqs_drul_[LEFT] = 0;
 109       accepted_spanreqs_drul_[RIGHT] = 0;
 110       /*
 111         Let's not kill the line spanner, since that would fuck up
 112         earlier, not-to-be-terminated stuff.
 113
 114         It will disappear by itself when stop_translation_timestep
 115         () finds that there is nothing to support anymore.  */
 116
 117       if (cresc_)
 118         cresc_->suicide ();
 119       cresc_ = 0;
 120     }
 121   else if (m->is_mus_type ("decrescendo-event")
 122            || m->is_mus_type ("crescendo-event"))
 123     {
 124       Direction d = to_dir (m->get_mus_property ("span-direction"));
 125       accepted_spanreqs_drul_[d] = m;
 126       return true;
 127     }
 128   return false;
 129 }
 130
 131 void
 132 Dynamic_engraver::process_music ()
 133 {
 134   if (accepted_spanreqs_drul_[START] || accepted_spanreqs_drul_[STOP] || script_ev_)
 135     {
 136       if (!line_spanner_)
 137         {
 138           line_spanner_ = new Spanner (get_property ("DynamicLineSpanner"));
 139
 140           Music * rq = accepted_spanreqs_drul_[START];
 141           if (script_ev_)
 142             rq =  script_ev_ ;
 143           announce_grob(line_spanner_, rq ? rq->self_scm(): SCM_EOL);
 144         }
 145     }
 146
 147   /*
 148     During a (de)crescendo, pending event will not be cleared,
 149     and a line-spanner will always be created, as \< \! are already
 150     two events.
 151
 152     Note: line-spanner must always have at least same duration
 153     as (de)crecsendo, b.o. line-breaking.
 154   */
 155
 156
 157
 158   /*
 159     maybe we should leave dynamic texts to the text-engraver and
 160     simply acknowledge them?
 161   */
 162   if (script_ev_)
 163     {
 164       script_ = new Item (get_property ("DynamicText"));
 165       script_->set_grob_property ("text",
 166                                    script_ev_->get_mus_property ("text"));
 167
 168
 169       if (Direction d = to_dir (script_ev_->get_mus_property ("direction")))
 170         Directional_element_interface::set (line_spanner_, d);
 171
 172       Axis_group_interface::add_element (line_spanner_, script_);
 173
 174       announce_grob(script_, script_ev_->self_scm());
 175     }
 176
 177   Music *stop_ev = accepted_spanreqs_drul_ [STOP] ?
 178     accepted_spanreqs_drul_[STOP] : script_ev_;
 179
 180   if (accepted_spanreqs_drul_[STOP] || script_ev_)
 181     {
 182       /*
 183         finish side position alignment if the (de)cresc ends here, and
 184         there are no new dynamics.
 185        */
 186
 187
 188       if (cresc_)
 189         {
 190           assert (!finished_cresc_ && cresc_);
 191
 192           cresc_->set_bound (RIGHT, script_
 193                                ? script_
 194                                : unsmob_grob (get_property ("currentMusicalColumn")));
 195           add_bound_item (line_spanner_, cresc_->get_bound (RIGHT));
 196
 197
 198           finished_cresc_ = cresc_;
 199           cresc_ = 0;
 200           current_cresc_ev_ = 0;
 201         }
 202       else if (accepted_spanreqs_drul_[STOP] )
 203         {
 204           accepted_spanreqs_drul_[STOP]->origin ()->warning(_ ("can't find start of (de)crescendo"));
 205           stop_ev = 0;
 206         }
 207
 208     }
 209
 210   if (accepted_spanreqs_drul_[START])
 211     {
 212       if (current_cresc_ev_)
 213         {
 214           Direction sd = to_dir (current_cresc_ev_->get_mus_property ("span-direction"));
 215           String msg = sd == 1
 216             ? _ ("already have a crescendo")
 217             : _ ("already have a decrescendo");
 218
 219           accepted_spanreqs_drul_[START]->origin ()->warning (msg);
 220           current_cresc_ev_->origin ()->warning (_("Cresc started here"));
 221         }
 222       else
 223         {
 224           current_cresc_ev_ = accepted_spanreqs_drul_[START];
 225
 226           if (Direction d = to_dir (current_cresc_ev_->get_mus_property ("direction")))
 227             Directional_element_interface::set (line_spanner_, d);
 228
 229           /*
 230             TODO: Use symbols.
 231           */
 232
 233           String start_type =
 234             ly_symbol2string (current_cresc_ev_->get_mus_property ("name"));
 235
 236           /*
 237             ugh. Use push/pop?
 238           */
 239           if (start_type == "DecrescendoEvent")
 240             start_type = "decrescendo";
 241           else if (start_type == "CrescendoEvent")
 242             start_type = "crescendo";
 243
 244           SCM s = get_property ((start_type + "Spanner").to_str0 ());
 245           if (!gh_symbol_p (s) || s == ly_symbol2scm ("hairpin"))
 246             {
 247               cresc_  = new Spanner (get_property ("Hairpin"));
 248               cresc_->set_grob_property ("grow-direction",
 249                                            gh_int2scm ((start_type == "crescendo")
 250                                                        ? BIGGER : SMALLER));
 251
 252             }
 253
 254
 255           /*
 256             This is a convenient (and legacy) interface to TextSpanners
 257             for use in (de)crescendi.
 258             Hmm.
 259           */
 260           else
 261             {
 262               cresc_  = new Spanner (get_property ("TextSpanner"));
 263               cresc_->set_grob_property ("style", s);
 264               daddy_trans_->set_property ((start_type
 265                                             + "Spanner").to_str0 (), SCM_EOL);
 266               s = get_property ((start_type + "Text").to_str0 ());
 267               /*
 268                 FIXME: use get_markup () to check type.
 269               */
 270               if (gh_string_p (s) || gh_pair_p (s))
 271                 {
 272                   cresc_->set_grob_property ("edge-text",
 273                                              gh_cons (s, scm_makfrom0str ("")));
 274                   daddy_trans_->set_property ((start_type + "Text").to_str0 (),
 275                                                 SCM_EOL);
 276                 }
 277             }
 278
 279           cresc_->set_bound (LEFT, script_
 280                                ? script_
 281                                : unsmob_grob (get_property ("currentMusicalColumn")));
 282
 283           Axis_group_interface::add_element (line_spanner_, cresc_);
 284
 285           add_bound_item (line_spanner_, cresc_->get_bound (LEFT));
 286
 287           announce_grob(cresc_, accepted_spanreqs_drul_[START]->self_scm());
 288         }
 289     }
 290 }
 291
 292 void
 293 Dynamic_engraver::stop_translation_timestep ()
 294 {
 295   typeset_all ();
 296   if (!current_cresc_ev_)
 297     {
 298       finished_line_spanner_ = line_spanner_;
 299       line_spanner_ =0;
 300       typeset_all ();
 301     }
 302 }
 303
 304 void
 305 Dynamic_engraver::finalize ()
 306 {
 307   typeset_all ();
 308
 309   if (line_spanner_
 310       && !line_spanner_->live())
 311     line_spanner_ = 0;
 312   if (line_spanner_)
 313     {
 314       finished_line_spanner_ = line_spanner_;
 315       typeset_all ();
 316     }
 317
 318   if (cresc_
 319       && !cresc_->live())
 320     cresc_ = 0;
 321   if (cresc_)
 322     {
 323       current_cresc_ev_->origin ()->warning (_ ("unterminated (de)crescendo"));
 324       cresc_->suicide ();
 325       cresc_ = 0;
 326     }
 327 }
 328
 329 void
 330 Dynamic_engraver::typeset_all ()
 331 {
 332   /*
 333     remove suicided spanners,
 334     ugh: we'll need this for every spanner, beam, slur
 335     Hmm, how to do this, cleanly?
 336     Maybe just check at typeset_grob ()?
 337   */
 338   if (finished_cresc_
 339       && !finished_cresc_->live())
 340     finished_cresc_ = 0;
 341   if (finished_line_spanner_
 342       && !finished_line_spanner_->live())
 343     finished_line_spanner_ = 0;
 344
 345   if (finished_cresc_)
 346     {
 347       if (!finished_cresc_->get_bound (RIGHT))
 348         {
 349           finished_cresc_->set_bound (RIGHT, script_
 350                                         ? script_
 351                                         : unsmob_grob (get_property ("currentMusicalColumn")));
 352
 353           if (finished_line_spanner_)
 354             add_bound_item (finished_line_spanner_,
 355                             finished_cresc_->get_bound (RIGHT));
 356         }
 357       typeset_grob (finished_cresc_);
 358       finished_cresc_ =0;
 359     }
 360
 361   if (script_)
 362     {
 363       typeset_grob (script_);
 364       script_ = 0;
 365     }
 366   if (finished_line_spanner_)
 367     {
 368       /* To make sure that this works */
 369       Side_position_interface::add_staff_support (finished_line_spanner_);
 370
 371       /*
 372         We used to have
 373
 374              extend-spanner-over-elements (finished_line_spanner_);
 375
 376         but this is rather kludgy, since finished_line_spanner_
 377         typically has a staff-symbol field set , extending it over the
 378         entire staff.
 379
 380       */
 381
 382       Grob * l = finished_line_spanner_->get_bound (LEFT );
 383       Grob * r = finished_line_spanner_->get_bound (RIGHT);
 384       if (!r && l)
 385         finished_line_spanner_->set_bound (RIGHT, l);
 386       else if (!l && r)
 387         finished_line_spanner_->set_bound (LEFT, r);
 388       else if (!r && !l)
 389         {
 390           /*
 391             This is a isolated dynamic apparently, and does not even have
 392             any interesting support item.
 393            */
 394           Grob * cc = unsmob_grob (get_property ("currentMusicalColumn"));
 395           Item * ci = dynamic_cast<Item*>(cc);
 396           finished_line_spanner_->set_bound (RIGHT, ci);
 397           finished_line_spanner_->set_bound (LEFT, ci);
 398         }
 399
 400       typeset_grob (finished_line_spanner_);
 401       finished_line_spanner_ = 0;
 402     }
 403 }
 404
 405 void
 406 Dynamic_engraver::acknowledge_grob (Grob_info i)
 407 {
 408   if (!line_spanner_)
 409     return ;
 410
 411   if (Note_column::has_interface (i.grob_))
 412     {
 413       if (line_spanner_
 414           /* Don't refill killed spanner */
 415           && line_spanner_->live())
 416         {
 417           Side_position_interface::add_support (line_spanner_,i.grob_);
 418           add_bound_item (line_spanner_,dynamic_cast<Item*> (i.grob_));
 419         }
 420
 421       if (script_ && !script_->get_parent (X_AXIS))
 422         {
 423           script_->set_parent (i.grob_,  X_AXIS);
 424         }
 425
 426     }
 427   else if (Script_interface::has_interface (i.grob_) && script_)
 428     {
 429       SCM p = i.grob_->get_grob_property ("script-priority");
 430
 431       /*
 432         UGH.
 433
 434         DynamicText doesn't really have a script-priority field.
 435        */
 436       if (gh_number_p (p)
 437           && gh_scm2int (p) < gh_scm2int (script_->get_grob_property ("script-priority")))
 438         {
 439           Side_position_interface::add_support (line_spanner_, i.grob_);
 440
 441         }
 442     }
 443 }
 444 ENTER_DESCRIPTION(Dynamic_engraver,
 445 /* descr */
 446 "This engraver creates hairpins, dynamic texts, and their vertical\n"
 447 "alignments.  The symbols are collected onto a DynamicLineSpanner grob\n"
 448 "which takes care of vertical positioning.  "
 449 ,
 450
 451 /* creats*/       "DynamicLineSpanner DynamicText Hairpin TextSpanner",
 452 /* accepts */     "absolute-dynamic-event crescendo-event decrescendo-event",
 453 /* acks  */      "note-column-interface script-interface",
 454 /* reads */       "",
 455 /* write */       "");