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--2001 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 public:
  60   VIRTUAL_COPY_CONS(Translator);
  61   Dynamic_engraver ();
  62
  63 protected:
  64   virtual void finalize ();
  65   virtual void acknowledge_grob (Grob_info);
  66   virtual bool try_music (Music *req_l);
  67   virtual void stop_translation_timestep ();
  68   virtual void process_music ();
  69   virtual void start_translation_timestep ();
  70 };
  71
  72 ADD_THIS_TRANSLATOR (Dynamic_engraver);
  73
  74
  75 Dynamic_engraver::Dynamic_engraver ()
  76 {
  77   script_p_ = 0;
  78   finished_cresc_p_ = 0;
  79   line_spanner_ = 0;
  80   finished_line_spanner_ = 0;
  81   current_cresc_req_ = 0;
  82   cresc_p_ =0;
  83
  84   script_req_l_ = 0;
  85   accepted_spanreqs_drul_[START] = 0;
  86   accepted_spanreqs_drul_[STOP] = 0;
  87 }
  88
  89 void
  90 Dynamic_engraver::start_translation_timestep ()
  91 {
  92   script_req_l_ = 0;
  93   accepted_spanreqs_drul_[START] = 0;
  94   accepted_spanreqs_drul_[STOP] = 0;
  95 }
  96
  97 bool
  98 Dynamic_engraver::try_music (Music * m)
  99 {
 100   if (dynamic_cast <Text_script_req*> (m)
 101       && m->get_mus_property ("text-type") == ly_symbol2scm ("dynamic"))
 102     {
 103       script_req_l_ = dynamic_cast<Text_script_req*> (m);
 104       return true;
 105     }
 106   else if (Span_req* s =  dynamic_cast <Span_req*> (m))
 107     {
 108       String t = ly_scm2string (s->get_mus_property ("span-type"));
 109       if (t== "abort")
 110         {
 111           accepted_spanreqs_drul_[LEFT] = 0;
 112           accepted_spanreqs_drul_[RIGHT] = 0;
 113           /*
 114             Let's not kill the line spanner, since that would fuck up
 115             earlier, not-to-be-terminated stuff.
 116
 117             It will disappear by itself when stop_translation_timestep
 118             () finds that there is nothing to support anymore.  */
 119
 120           if (cresc_p_)
 121             cresc_p_->suicide ();
 122           cresc_p_ = 0;
 123         }
 124       else if (t == "crescendo"
 125            || t == "decrescendo")
 126         {
 127           accepted_spanreqs_drul_[s->get_span_dir()] = s;
 128           return true;
 129         }
 130     }
 131   return false;
 132 }
 133
 134 void
 135 Dynamic_engraver::process_music ()
 136 {
 137   if (accepted_spanreqs_drul_[START] || accepted_spanreqs_drul_[STOP] || script_req_l_)
 138     {
 139       if (!line_spanner_)
 140         {
 141           line_spanner_ = new Spanner (get_property ("DynamicLineSpanner"));
 142
 143           Side_position_interface::set_axis (line_spanner_, Y_AXIS);
 144           Axis_group_interface::set_interface (line_spanner_);
 145           Axis_group_interface::set_axes (line_spanner_, Y_AXIS, Y_AXIS);
 146
 147           Music * rq = accepted_spanreqs_drul_[START];
 148           if (script_req_l_)
 149             rq =  script_req_l_ ;
 150           announce_grob (line_spanner_, rq);
 151
 152
 153         }
 154     }
 155
 156         /*
 157         During a (de)crescendo, pending request will not be cleared,
 158         and a line-spanner will always be created, as \< \! are already
 159         two requests.
 160
 161         Note: line-spanner must always have at least same duration
 162         as (de)crecsendo, b.o. line-breaking.
 163         */
 164
 165
 166
 167   /*
 168     maybe we should leave dynamic texts to the text-engraver and
 169     simply acknowledge them?
 170   */
 171   if (script_req_l_)
 172     {
 173       script_p_ = new Item (get_property ("DynamicText"));
 174       script_p_->set_grob_property ("text",
 175                                    script_req_l_->get_mus_property ("text"));
 176
 177       Side_position_interface::set_direction (script_p_, LEFT);
 178       Side_position_interface::set_axis (script_p_, X_AXIS);
 179
 180       if (Direction d = script_req_l_->get_direction ())
 181         Directional_element_interface::set (line_spanner_, d);
 182
 183       Axis_group_interface::add_element (line_spanner_, script_p_);
 184
 185       announce_grob (script_p_, script_req_l_);
 186     }
 187
 188   if (accepted_spanreqs_drul_[STOP])
 189     {
 190       /*
 191         finish side position alignment if the (de)cresc ends here, and
 192         there are no new dynamics.
 193        */
 194
 195       if ( !cresc_p_)
 196         {
 197           accepted_spanreqs_drul_[STOP]->origin ()->warning
 198             (_ ("can't find start of (de)crescendo"));
 199           accepted_spanreqs_drul_[STOP] = 0;
 200         }
 201       else
 202         {
 203           assert (!finished_cresc_p_ && cresc_p_);
 204
 205           cresc_p_->set_bound (RIGHT, script_p_
 206                                ? script_p_
 207                                : unsmob_grob (get_property ("currentMusicalColumn")));
 208           add_bound_item (line_spanner_, cresc_p_->get_bound (RIGHT));
 209
 210
 211           finished_cresc_p_ = cresc_p_;
 212           cresc_p_ = 0;
 213           current_cresc_req_ = 0;
 214         }
 215     }
 216
 217   if (accepted_spanreqs_drul_[START])
 218     {
 219       if (current_cresc_req_)
 220         {
 221           accepted_spanreqs_drul_[START]->origin ()->warning
 222             (current_cresc_req_->get_span_dir() == 1
 223              ? _ ("already have a crescendo")
 224              : _ ("already have a decrescendo"));
 225         }
 226       else
 227         {
 228           current_cresc_req_ = accepted_spanreqs_drul_[START];
 229
 230           /*
 231             TODO: Use symbols.
 232           */
 233
 234           String start_type = ly_scm2string (accepted_spanreqs_drul_[START]->get_mus_property ("span-type"));
 235
 236           /*
 237             ugh. Use push/pop?
 238           */
 239           SCM s = get_property ((start_type + "Spanner").ch_C());
 240           if (!gh_symbol_p (s) || s == ly_symbol2scm ("hairpin"))
 241             {
 242               cresc_p_  = new Spanner (get_property ("Hairpin"));
 243               cresc_p_->set_grob_property ("grow-direction",
 244                                            gh_int2scm ((start_type == "crescendo")
 245                                                        ? BIGGER : SMALLER));
 246
 247             }
 248           /*
 249             This is a convenient (and legacy) interface to TextSpanners
 250             for use in (de)crescendi.
 251             Hmm.
 252           */
 253           else
 254             {
 255               cresc_p_  = new Spanner (get_property ("TextSpanner"));
 256               cresc_p_->set_interface (ly_symbol2scm ("dynamic-interface"));
 257               cresc_p_->set_grob_property ("type", s);
 258
 259               daddy_trans_l_->set_property (start_type
 260                                             + "Spanner", SCM_UNDEFINED);
 261               s = get_property ((start_type + "Text").ch_C());
 262               if (gh_string_p (s))
 263                 {
 264                   cresc_p_->set_grob_property ("edge-text",
 265                                                gh_cons (s, ly_str02scm ("")));
 266                   daddy_trans_l_->set_property (start_type + "Text",
 267                                                 SCM_UNDEFINED);
 268                 }
 269             }
 270
 271           cresc_p_->set_bound (LEFT, script_p_
 272                                ? script_p_
 273                                : unsmob_grob (get_property ("currentMusicalColumn")));
 274
 275           Axis_group_interface::add_element (line_spanner_, cresc_p_);
 276
 277           add_bound_item (line_spanner_, cresc_p_->get_bound (LEFT));
 278
 279           announce_grob (cresc_p_, accepted_spanreqs_drul_[START]);
 280         }
 281     }
 282 }
 283
 284 void
 285 Dynamic_engraver::stop_translation_timestep ()
 286 {
 287   typeset_all ();
 288   if (script_req_l_ && !current_cresc_req_)
 289     {
 290       finished_line_spanner_ = line_spanner_;
 291       line_spanner_ =0;
 292       typeset_all ();
 293     }
 294 }
 295
 296 void
 297 Dynamic_engraver::finalize ()
 298 {
 299   typeset_all ();
 300   if (line_spanner_)
 301     {
 302       finished_line_spanner_ = line_spanner_;
 303       typeset_all ();
 304     }
 305
 306   if (cresc_p_)
 307     {
 308       current_cresc_req_->origin ()->warning (_ ("unterminated (de)crescendo"));
 309       cresc_p_->suicide ();
 310       cresc_p_ = 0;
 311     }
 312 }
 313
 314 void
 315 Dynamic_engraver::typeset_all ()
 316 {
 317   if (finished_cresc_p_)
 318     {
 319       if (!finished_cresc_p_->get_bound (RIGHT))
 320         {
 321           finished_cresc_p_->set_bound (RIGHT, script_p_
 322                                         ? script_p_
 323                                         : unsmob_grob (get_property ("currentMusicalColumn")));
 324
 325           if (finished_line_spanner_)
 326             add_bound_item (finished_line_spanner_,
 327                             finished_cresc_p_->get_bound (RIGHT));
 328         }
 329       typeset_grob (finished_cresc_p_);
 330       finished_cresc_p_ =0;
 331     }
 332
 333   if (script_p_)
 334     {
 335       typeset_grob (script_p_);
 336       script_p_ = 0;
 337     }
 338   if (finished_line_spanner_)
 339     {
 340       /*
 341         To make sure that this works
 342       */
 343       Side_position_interface::add_staff_support (finished_line_spanner_);
 344       /*
 345         We used to have
 346
 347              extend_spanner_over_elements (finished_line_spanner_);
 348
 349         but this is rather kludgy, since finished_line_spanner_
 350         typically has a staff-symbol field set , extending it over the
 351         entire staff.
 352
 353       */
 354
 355       if (!finished_line_spanner_->get_bound (RIGHT))
 356         finished_line_spanner_->set_bound (RIGHT, finished_line_spanner_->get_bound (LEFT));
 357
 358       typeset_grob (finished_line_spanner_);
 359       finished_line_spanner_ = 0;
 360     }
 361 }
 362
 363 void
 364 Dynamic_engraver::acknowledge_grob (Grob_info i)
 365 {
 366   if (Note_column::has_interface (i.elem_l_))
 367     {
 368       if (line_spanner_)
 369         {
 370           Side_position_interface::add_support (line_spanner_,i.elem_l_);
 371           add_bound_item (line_spanner_,dynamic_cast<Item*>(i.elem_l_));
 372         }
 373     }
 374 }