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--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include "debug.hh"
   9 #include "dimensions.hh"
  10 #include "hairpin.hh"
  11 #include "musical-request.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
  22
  23 /*
  24   TODO:
  25
  26   * direction of text-dynamic-request 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_p_;
  43   Spanner * finished_cresc_p_;
  44   Spanner * cresc_p_;
  45
  46   Text_script_req* script_req_l_;
  47
  48   Span_req * current_cresc_req_;
  49   Drul_array<Span_req*> accepted_spanreqs_drul_;
  50
  51   Spanner* line_spanner_;
  52   Spanner* finished_line_spanner_;
  53
  54   Link_array<Note_column> pending_column_arr_;
  55   Link_array<Grob> pending_element_arr_;
  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_l);
  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_p_ = 0;
  76   finished_cresc_p_ = 0;
  77   line_spanner_ = 0;
  78   finished_line_spanner_ = 0;
  79   current_cresc_req_ = 0;
  80   cresc_p_ =0;
  81
  82   script_req_l_ = 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_req_l_ = 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 (dynamic_cast <Text_script_req*> (m)
  99       && m->get_mus_property ("text-type") == ly_symbol2scm ("dynamic"))
 100     {
 101       script_req_l_ = dynamic_cast<Text_script_req*> (m);
 102       return true;
 103     }
 104   else if (Span_req* s =  dynamic_cast <Span_req*> (m))
 105     {
 106       String t = ly_scm2string (s->get_mus_property ("span-type"));
 107       if (t== "abort")
 108         {
 109           accepted_spanreqs_drul_[LEFT] = 0;
 110           accepted_spanreqs_drul_[RIGHT] = 0;
 111           /*
 112             Let's not kill the line spanner, since that would fuck up
 113             earlier, not-to-be-terminated stuff.
 114
 115             It will disappear by itself when stop_translation_timestep
 116  () finds that there is nothing to support anymore.  */
 117
 118           if (cresc_p_)
 119             cresc_p_->suicide ();
 120           cresc_p_ = 0;
 121         }
 122       else if (t == "crescendo"
 123            || t == "decrescendo")
 124         {
 125           accepted_spanreqs_drul_[s->get_span_dir ()] = s;
 126           return true;
 127         }
 128     }
 129   return false;
 130 }
 131
 132 void
 133 Dynamic_engraver::process_music ()
 134 {
 135   if (accepted_spanreqs_drul_[START] || accepted_spanreqs_drul_[STOP] || script_req_l_)
 136     {
 137       if (!line_spanner_)
 138         {
 139           line_spanner_ = new Spanner (get_property ("DynamicLineSpanner"));
 140
 141           Side_position_interface::set_axis (line_spanner_, Y_AXIS);
 142
 143           Music * rq = accepted_spanreqs_drul_[START];
 144           if (script_req_l_)
 145             rq =  script_req_l_ ;
 146           announce_grob(line_spanner_, rq ? rq->self_scm(): SCM_EOL);
 147
 148
 149         }
 150     }
 151
 152         /*
 153         During a (de)crescendo, pending request will not be cleared,
 154         and a line-spanner will always be created, as \< \! are already
 155         two requests.
 156
 157         Note: line-spanner must always have at least same duration
 158         as (de)crecsendo, b.o. line-breaking.
 159         */
 160
 161
 162
 163   /*
 164     maybe we should leave dynamic texts to the text-engraver and
 165     simply acknowledge them?
 166   */
 167   if (script_req_l_)
 168     {
 169       script_p_ = new Item (get_property ("DynamicText"));
 170       script_p_->set_grob_property ("text",
 171                                    script_req_l_->get_mus_property ("text"));
 172
 173       if (Direction d = script_req_l_->get_direction ())
 174         Directional_element_interface::set (line_spanner_, d);
 175
 176       Axis_group_interface::add_element (line_spanner_, script_p_);
 177
 178       announce_grob(script_p_, script_req_l_->self_scm());
 179     }
 180
 181   if (accepted_spanreqs_drul_[STOP])
 182     {
 183       /*
 184         finish side position alignment if the (de)cresc ends here, and
 185         there are no new dynamics.
 186        */
 187
 188       if (!cresc_p_)
 189         {
 190           accepted_spanreqs_drul_[STOP]->origin ()->warning
 191  (_ ("can't find start of (de)crescendo"));
 192           accepted_spanreqs_drul_[STOP] = 0;
 193         }
 194       else
 195         {
 196           assert (!finished_cresc_p_ && cresc_p_);
 197
 198           cresc_p_->set_bound (RIGHT, script_p_
 199                                ? script_p_
 200                                : unsmob_grob (get_property ("currentMusicalColumn")));
 201           add_bound_item (line_spanner_, cresc_p_->get_bound (RIGHT));
 202
 203
 204           finished_cresc_p_ = cresc_p_;
 205           cresc_p_ = 0;
 206           current_cresc_req_ = 0;
 207         }
 208     }
 209
 210   if (accepted_spanreqs_drul_[START])
 211     {
 212       if (current_cresc_req_)
 213         {
 214           accepted_spanreqs_drul_[START]->origin ()->warning
 215  (current_cresc_req_->get_span_dir () == 1
 216              ? _ ("already have a crescendo")
 217              : _ ("already have a decrescendo"));
 218
 219           current_cresc_req_->origin ()->warning (_("Cresc started here"));
 220         }
 221       else
 222         {
 223           current_cresc_req_ = accepted_spanreqs_drul_[START];
 224
 225           /*
 226             TODO: Use symbols.
 227           */
 228
 229           String start_type = ly_scm2string (accepted_spanreqs_drul_[START]->get_mus_property ("span-type"));
 230
 231           /*
 232             ugh. Use push/pop?
 233           */
 234           SCM s = get_property ((start_type + "Spanner").ch_C ());
 235           if (!gh_symbol_p (s) || s == ly_symbol2scm ("hairpin"))
 236             {
 237               cresc_p_  = new Spanner (get_property ("Hairpin"));
 238               cresc_p_->set_grob_property ("grow-direction",
 239                                            gh_int2scm ((start_type == "crescendo")
 240                                                        ? BIGGER : SMALLER));
 241
 242             }
 243           /*
 244             This is a convenient (and legacy) interface to TextSpanners
 245             for use in (de)crescendi.
 246             Hmm.
 247           */
 248           else
 249             {
 250               cresc_p_  = new Spanner (get_property ("TextSpanner"));
 251               cresc_p_->set_grob_property ("type", s);
 252               daddy_trans_l_->set_property ((start_type
 253                                             + "Spanner").ch_C(), SCM_UNDEFINED);
 254               s = get_property ((start_type + "Text").ch_C ());
 255               /*
 256                 FIXME: use markup_p () to check type.
 257               */
 258               if (gh_string_p (s) || gh_pair_p (s))
 259                 {
 260                   cresc_p_->set_grob_property ("edge-text",
 261                                                gh_cons (s, ly_str02scm ("")));
 262                   daddy_trans_l_->set_property ((start_type + "Text").ch_C(),
 263                                                 SCM_UNDEFINED);
 264                 }
 265             }
 266
 267           cresc_p_->set_bound (LEFT, script_p_
 268                                ? script_p_
 269                                : unsmob_grob (get_property ("currentMusicalColumn")));
 270
 271           Axis_group_interface::add_element (line_spanner_, cresc_p_);
 272
 273           add_bound_item (line_spanner_, cresc_p_->get_bound (LEFT));
 274
 275           announce_grob(cresc_p_, accepted_spanreqs_drul_[START]->self_scm());
 276         }
 277     }
 278 }
 279
 280 void
 281 Dynamic_engraver::stop_translation_timestep ()
 282 {
 283   typeset_all ();
 284   if (script_req_l_ && !current_cresc_req_)
 285     {
 286       finished_line_spanner_ = line_spanner_;
 287       line_spanner_ =0;
 288       typeset_all ();
 289     }
 290 }
 291
 292 void
 293 Dynamic_engraver::finalize ()
 294 {
 295   typeset_all ();
 296
 297   if (line_spanner_
 298       && line_spanner_->immutable_property_alist_ == SCM_EOL)
 299     line_spanner_ = 0;
 300   if (line_spanner_)
 301     {
 302       finished_line_spanner_ = line_spanner_;
 303       typeset_all ();
 304     }
 305
 306   if (cresc_p_
 307       && cresc_p_->immutable_property_alist_ == SCM_EOL)
 308     cresc_p_ = 0;
 309   if (cresc_p_)
 310     {
 311       current_cresc_req_->origin ()->warning (_ ("unterminated (de)crescendo"));
 312       cresc_p_->suicide ();
 313       cresc_p_ = 0;
 314     }
 315 }
 316
 317 void
 318 Dynamic_engraver::typeset_all ()
 319 {
 320   /*
 321     remove suicided spanners,
 322     ugh: we'll need this for every spanner, beam, slur
 323     Hmm, how to do this, cleanly?
 324     Maybe just check at typeset_grob ()?
 325   */
 326   if (finished_cresc_p_
 327       && finished_cresc_p_->immutable_property_alist_ == SCM_EOL)
 328     finished_cresc_p_ = 0;
 329   if (finished_line_spanner_
 330       && finished_line_spanner_->immutable_property_alist_ == SCM_EOL)
 331     finished_line_spanner_ = 0;
 332
 333   if (finished_cresc_p_)
 334     {
 335       if (!finished_cresc_p_->get_bound (RIGHT))
 336         {
 337           finished_cresc_p_->set_bound (RIGHT, script_p_
 338                                         ? script_p_
 339                                         : unsmob_grob (get_property ("currentMusicalColumn")));
 340
 341           if (finished_line_spanner_)
 342             add_bound_item (finished_line_spanner_,
 343                             finished_cresc_p_->get_bound (RIGHT));
 344         }
 345       typeset_grob (finished_cresc_p_);
 346       finished_cresc_p_ =0;
 347     }
 348
 349   if (script_p_)
 350     {
 351       typeset_grob (script_p_);
 352       script_p_ = 0;
 353     }
 354   if (finished_line_spanner_)
 355     {
 356       /* To make sure that this works */
 357       Side_position_interface::add_staff_support (finished_line_spanner_);
 358
 359       /*
 360         We used to have
 361
 362              extend_spanner_over_elements (finished_line_spanner_);
 363
 364         but this is rather kludgy, since finished_line_spanner_
 365         typically has a staff-symbol field set , extending it over the
 366         entire staff.
 367
 368       */
 369
 370       Grob * l = finished_line_spanner_->get_bound (LEFT );
 371       Grob * r = finished_line_spanner_->get_bound (RIGHT);
 372       if (!r && l)
 373         finished_line_spanner_->set_bound (RIGHT, l);
 374       else if (!l && r)
 375         finished_line_spanner_->set_bound (LEFT, r);
 376       else if (!r && !l)
 377         {
 378           /*
 379             This is a isolated dynamic apparently, and does not even have
 380             any interesting support item.
 381            */
 382           Grob * cc = unsmob_grob (get_property ("currentMusicalColumn"));
 383           Item * ci = dynamic_cast<Item*>(cc);
 384           finished_line_spanner_->set_bound (RIGHT, ci);
 385           finished_line_spanner_->set_bound (LEFT, ci);
 386         }
 387
 388       typeset_grob (finished_line_spanner_);
 389       finished_line_spanner_ = 0;
 390     }
 391 }
 392
 393 void
 394 Dynamic_engraver::acknowledge_grob (Grob_info i)
 395 {
 396   if (Note_column::has_interface (i.grob_l_))
 397     {
 398       if (line_spanner_
 399           /* Don't refill killed spanner */
 400           && line_spanner_->immutable_property_alist_ != SCM_EOL)
 401         {
 402           Side_position_interface::add_support (line_spanner_,i.grob_l_);
 403           add_bound_item (line_spanner_,dynamic_cast<Item*> (i.grob_l_));
 404         }
 405     }
 406 }
 407 ENTER_DESCRIPTION(Dynamic_engraver,
 408 /* descr */       "
 409 This engraver creates hairpins, dynamic texts, and their vertical
 410 alignments.  The symbols are collected onto a DynamicLineSpanner grob
 411 which takes care of vertical positioning.
 412 ",
 413
 414 /* creats*/       "DynamicLineSpanner DynamicText Hairpin TextSpanner",
 415 /* acks  */       "note-column-interface",
 416 /* reads */       "",
 417 /* write */       "");