lily/system.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "system.hh"
  21
  22 #include "align-interface.hh"
  23 #include "all-font-metrics.hh"
  24 #include "axis-group-interface.hh"
  25 #include "grob-array.hh"
  26 #include "hara-kiri-group-spanner.hh"
  27 #include "international.hh"
  28 #include "lookup.hh"
  29 #include "main.hh"
  30 #include "output-def.hh"
  31 #include "page-layout-problem.hh"
  32 #include "paper-column.hh"
  33 #include "paper-score.hh"
  34 #include "paper-system.hh"
  35 #include "pointer-group-interface.hh"
  36 #include "skyline-pair.hh"
  37 #include "staff-symbol-referencer.hh"
  38 #include "warn.hh"
  39
  40 System::System (System const &src)
  41   : Spanner (src)
  42 {
  43   all_elements_ = 0;
  44   pscore_ = 0;
  45   rank_ = 0;
  46   init_elements ();
  47 }
  48
  49 System::System (SCM s)
  50   : Spanner (s)
  51 {
  52   all_elements_ = 0;
  53   rank_ = 0;
  54   init_elements ();
  55 }
  56
  57 void
  58 System::init_elements ()
  59 {
  60   SCM scm_arr = Grob_array::make_array ();
  61   all_elements_ = unsmob_grob_array (scm_arr);
  62   all_elements_->set_ordered (false);
  63   set_object ("all-elements", scm_arr);
  64 }
  65
  66 Grob *
  67 System::clone () const
  68 {
  69   return new System (*this);
  70 }
  71
  72 int
  73 System::element_count () const
  74 {
  75   return all_elements_->size ();
  76 }
  77
  78 int
  79 System::spanner_count () const
  80 {
  81   int k = 0;
  82   for (vsize i = all_elements_->size (); i--;)
  83     if (dynamic_cast<Spanner *> (all_elements_->grob (i)))
  84       k++;
  85   return k;
  86 }
  87
  88 void
  89 System::typeset_grob (Grob *elem)
  90 {
  91   if (elem->layout_)
  92     programming_error ("adding element twice");
  93   else
  94     {
  95       elem->layout_ = pscore_->layout ();
  96       all_elements_->add (elem);
  97       elem->unprotect ();
  98     }
  99 }
 100
 101 void
 102 System::derived_mark () const
 103 {
 104   if (!all_elements_->empty ())
 105     {
 106       Grob **ptr = &all_elements_->array_reference ()[0];
 107       Grob **end = ptr + all_elements_->size ();
 108       while (ptr < end)
 109         {
 110           scm_gc_mark ((*ptr)->self_scm ());
 111           ptr++;
 112         }
 113     }
 114
 115   if (pscore_)
 116     scm_gc_mark (pscore_->self_scm ());
 117
 118   Spanner::derived_mark ();
 119 }
 120
 121 static void
 122 fixup_refpoints (vector<Grob *> const &grobs)
 123 {
 124   for (vsize i = grobs.size (); i--;)
 125     grobs[i]->fixup_refpoint ();
 126 }
 127
 128 void
 129 System::do_break_substitution_and_fixup_refpoints ()
 130 {
 131   for (vsize i = 0; i < all_elements_->size (); i++)
 132     {
 133       Grob *g = all_elements_->grob (i);
 134       if (g->internal_has_interface (ly_symbol2scm ("only-prebreak-interface")))
 135         {
 136           /*
 137             Kill no longer needed grobs.
 138           */
 139           Item *it = dynamic_cast<Item *> (g);
 140           if (it && Item::is_non_musical (it))
 141             {
 142               it->find_prebroken_piece (LEFT)->suicide ();
 143               it->find_prebroken_piece (RIGHT)->suicide ();
 144             }
 145           g->suicide ();
 146         }
 147       else if (g->is_live ())
 148         g->do_break_processing ();
 149     }
 150
 151   /*
 152     fixups must be done in broken line_of_scores, because new elements
 153     are put over there.  */
 154   int count = 0;
 155   for (vsize i = 0; i < broken_intos_.size (); i++)
 156     {
 157       Grob *se = broken_intos_[i];
 158
 159       extract_grob_set (se, "all-elements", all_elts);
 160       for (vsize j = 0; j < all_elts.size (); j++)
 161         {
 162           Grob *g = all_elts[j];
 163           g->fixup_refpoint ();
 164         }
 165
 166       count += all_elts.size ();
 167     }
 168
 169   /*
 170     needed for doing items.
 171   */
 172   fixup_refpoints (all_elements_->array ());
 173
 174   for (vsize i = 0; i < all_elements_->size (); i++)
 175     all_elements_->grob (i)->handle_broken_dependencies ();
 176
 177   handle_broken_dependencies ();
 178
 179   /* Because the this->get_property (all-elements) contains items in 3
 180      versions, handle_broken_dependencies () will leave duplicated
 181      items in all-elements.  Strictly speaking this is harmless, but
 182      it leads to duplicated symbols in the output.  uniq makes sure
 183      that no duplicates are in the list.  */
 184   for (vsize i = 0; i < broken_intos_.size (); i++)
 185     {
 186       System *child = dynamic_cast<System *> (broken_intos_[i]);
 187       child->all_elements_->remove_duplicates ();
 188       for (vsize j = 0; j < child->all_elements_->size (); j++)
 189         {
 190           Grob *g = child->all_elements_->grob (j);
 191
 192           (void) g->get_property ("after-line-breaking");
 193         }
 194     }
 195
 196   if (be_verbose_global)
 197     message (_f ("Element count %d", count + element_count ()) + "\n");
 198 }
 199
 200 SCM
 201 System::get_broken_system_grobs ()
 202 {
 203   SCM ret = SCM_EOL;
 204   for (vsize i = 0; i < broken_intos_.size (); i++)
 205     ret = scm_cons (broken_intos_[i]->self_scm (), ret);
 206   return scm_reverse (ret);
 207 }
 208
 209 SCM
 210 System::get_paper_systems ()
 211 {
 212   SCM lines = scm_c_make_vector (broken_intos_.size (), SCM_EOL);
 213   for (vsize i = 0; i < broken_intos_.size (); i++)
 214     {
 215       if (be_verbose_global)
 216         progress_indication ("[");
 217
 218       System *system = dynamic_cast<System *> (broken_intos_[i]);
 219
 220       scm_vector_set_x (lines, scm_from_int (i),
 221                         system->get_paper_system ());
 222
 223       if (be_verbose_global)
 224         progress_indication (to_string (i) + "]");
 225     }
 226   return lines;
 227 }
 228
 229 void
 230 System::break_into_pieces (vector<Column_x_positions> const &breaking)
 231 {
 232   for (vsize i = 0; i < breaking.size (); i++)
 233     {
 234       System *system = dynamic_cast<System *> (clone ());
 235       system->rank_ = broken_intos_.size ();
 236
 237       vector<Grob *> c (breaking[i].cols_);
 238       pscore_->typeset_system (system);
 239
 240       int st = Paper_column::get_rank (c[0]);
 241       int end = Paper_column::get_rank (c.back ());
 242       Interval iv (pure_height (this, st, end));
 243       system->set_property ("pure-Y-extent", ly_interval2scm (iv));
 244
 245       system->set_bound (LEFT, c[0]);
 246       system->set_bound (RIGHT, c.back ());
 247       SCM system_labels = SCM_EOL;
 248       for (vsize j = 0; j < c.size (); j++)
 249         {
 250           c[j]->translate_axis (breaking[i].config_[j], X_AXIS);
 251           dynamic_cast<Paper_column *> (c[j])->set_system (system);
 252           /* collect the column labels */
 253           SCM col_labels = c[j]->get_property ("labels");
 254           if (scm_is_pair (col_labels))
 255             system_labels = scm_append (scm_list_2 (col_labels, system_labels));
 256         }
 257       system->set_property ("labels", system_labels);
 258
 259       set_loose_columns (system, &breaking[i]);
 260       broken_intos_.push_back (system);
 261     }
 262 }
 263
 264 void
 265 System::add_column (Paper_column *p)
 266 {
 267   Grob *me = this;
 268   Grob_array *ga = unsmob_grob_array (me->get_object ("columns"));
 269   if (!ga)
 270     {
 271       SCM scm_ga = Grob_array::make_array ();
 272       me->set_object ("columns", scm_ga);
 273       ga = unsmob_grob_array (scm_ga);
 274     }
 275
 276   p->set_rank (ga->size ());
 277
 278   ga->add (p);
 279   Axis_group_interface::add_element (this, p);
 280 }
 281
 282 void
 283 System::pre_processing ()
 284 {
 285   for (vsize i = 0; i < all_elements_->size (); i++)
 286     all_elements_->grob (i)->discretionary_processing ();
 287
 288   if (be_verbose_global)
 289     message (_f ("Grob count %d", element_count ()));
 290
 291   /*
 292     order is significant: broken grobs are added to the end of the
 293     array, and should be processed before the original is potentially
 294     killed.
 295   */
 296   for (vsize i = all_elements_->size (); i--;)
 297     all_elements_->grob (i)->handle_prebroken_dependencies ();
 298
 299   fixup_refpoints (all_elements_->array ());
 300
 301   for (vsize i = 0; i < all_elements_->size (); i++)
 302     {
 303       Grob *g = all_elements_->grob (i);
 304       (void) g->get_property ("before-line-breaking");
 305     }
 306
 307   for (vsize i = 0; i < all_elements_->size (); i++)
 308     {
 309       Grob *e = all_elements_->grob (i);
 310       (void) e->get_property ("springs-and-rods");
 311     }
 312 }
 313
 314 void
 315 System::post_processing ()
 316 {
 317   Interval iv (extent (this, Y_AXIS));
 318   if (iv.is_empty ())
 319     programming_error ("system with empty extent");
 320   else
 321     translate_axis (-iv[MAX], Y_AXIS);
 322
 323   /* Generate all stencils to trigger font loads.
 324      This might seem inefficient, but Stencils are cached per grob
 325      anyway. */
 326
 327   vector<Grob *> all_elts_sorted (all_elements_->array ());
 328   vector_sort (all_elts_sorted, std::less<Grob *> ());
 329   uniq (all_elts_sorted);
 330   this->get_stencil ();
 331   for (vsize i = all_elts_sorted.size (); i--;)
 332     {
 333       Grob *g = all_elts_sorted[i];
 334       g->get_stencil ();
 335     }
 336 }
 337
 338 struct Layer_entry
 339 {
 340   Grob *grob_;
 341   int layer_;
 342 };
 343
 344 bool
 345 operator< (Layer_entry  const &a,
 346            Layer_entry  const &b)
 347 {
 348   return a.layer_ < b.layer_;
 349 }
 350
 351 SCM
 352 System::get_paper_system ()
 353 {
 354   SCM exprs = SCM_EOL;
 355   SCM *tail = &exprs;
 356
 357   post_processing ();
 358
 359   vector<Layer_entry> entries;
 360   for (vsize j = 0; j < all_elements_->size (); j++)
 361     {
 362       Layer_entry e;
 363       e.grob_ = all_elements_->grob (j);
 364       e.layer_ = robust_scm2int (e.grob_->get_property ("layer"), 1);
 365
 366       entries.push_back (e);
 367     }
 368
 369   vector_sort (entries, std::less<Layer_entry> ());
 370   for (vsize j = 0; j < entries.size (); j++)
 371     {
 372       Grob *g = entries[j].grob_;
 373       Stencil st = g->get_print_stencil ();
 374
 375       if (st.expr () == SCM_EOL)
 376         continue;
 377
 378       Offset o;
 379       for (int a = X_AXIS; a < NO_AXES; a++)
 380         o[Axis (a)] = g->relative_coordinate (this, Axis (a));
 381
 382       Offset extra = robust_scm2offset (g->get_property ("extra-offset"),
 383                                         Offset (0, 0))
 384         * Staff_symbol_referencer::staff_space (g);
 385
 386       /* Must copy the stencil, for we cannot change the stencil
 387          cached in G.  */
 388
 389       st.translate (o + extra);
 390
 391       *tail = scm_cons (st.expr (), SCM_EOL);
 392       tail = SCM_CDRLOC (*tail);
 393     }
 394
 395   if (Stencil *me = get_stencil ())
 396     exprs = scm_cons (me->expr (), exprs);
 397
 398   Interval x (extent (this, X_AXIS));
 399   Interval y (extent (this, Y_AXIS));
 400   Stencil sys_stencil (Box (x, y),
 401                        scm_cons (ly_symbol2scm ("combine-stencil"),
 402                                  exprs));
 403   if (debug_skylines)
 404     {
 405       Skyline_pair *skylines = Skyline_pair::unsmob (get_property ("vertical-skylines"));
 406       if (skylines)
 407         {
 408           Stencil up
 409             = Lookup::points_to_line_stencil (0.1, (*skylines)[UP].to_points (X_AXIS));
 410           Stencil down
 411             = Lookup::points_to_line_stencil (0.1, (*skylines)[DOWN].to_points (X_AXIS));
 412           sys_stencil.add_stencil (up.in_color (255, 0, 0));
 413           sys_stencil.add_stencil (down.in_color (0, 255, 0));
 414         }
 415     }
 416
 417   Grob *left_bound = this->get_bound (LEFT);
 418   SCM prop_init = left_bound->get_property ("line-break-system-details");
 419   Prob *pl = make_paper_system (prop_init);
 420   paper_system_set_stencil (pl, sys_stencil);
 421
 422   /* information that the page breaker might need */
 423   Grob *right_bound = this->get_bound (RIGHT);
 424   pl->set_property ("vertical-skylines", this->get_property ("vertical-skylines"));
 425   pl->set_property ("page-break-permission", right_bound->get_property ("page-break-permission"));
 426   pl->set_property ("page-turn-permission", right_bound->get_property ("page-turn-permission"));
 427   pl->set_property ("page-break-penalty", right_bound->get_property ("page-break-penalty"));
 428   pl->set_property ("page-turn-penalty", right_bound->get_property ("page-turn-penalty"));
 429
 430   Interval staff_refpoints;
 431   if (Grob *align = get_vertical_alignment ())
 432     {
 433       extract_grob_set (align, "elements", staves);
 434       for (vsize i = 0; i < staves.size (); i++)
 435         if (staves[i]->is_live ()
 436             && Page_layout_problem::is_spaceable (staves[i]))
 437           staff_refpoints.add_point (staves[i]->relative_coordinate (this,
 438                                                                      Y_AXIS));
 439     }
 440
 441   pl->set_property ("staff-refpoint-extent", ly_interval2scm (staff_refpoints));
 442   pl->set_property ("system-grob", this->self_scm ());
 443
 444   return pl->unprotect ();
 445 }
 446
 447 vector<Item *>
 448 System::broken_col_range (Item const *left, Item const *right) const
 449 {
 450   vector<Item *> ret;
 451
 452   left = left->get_column ();
 453   right = right->get_column ();
 454
 455   extract_grob_set (this, "columns", cols);
 456
 457   vsize i = Paper_column::get_rank (left);
 458   int end_rank = Paper_column::get_rank (right);
 459   if (i < cols.size ())
 460     i++;
 461
 462   while (i < cols.size ()
 463          && Paper_column::get_rank (cols[i]) < end_rank)
 464     {
 465       Paper_column *c = dynamic_cast<Paper_column *> (cols[i]);
 466       if (Paper_column::is_breakable (c) && !c->get_system ())
 467         ret.push_back (c);
 468       i++;
 469     }
 470
 471   return ret;
 472 }
 473
 474 /** Return all columns, but filter out any unused columns , since they might
 475     disrupt the spacing problem. */
 476 vector<Grob *>
 477 System::used_columns () const
 478 {
 479   extract_grob_set (this, "columns", ro_columns);
 480
 481   int last_breakable = ro_columns.size ();
 482
 483   while (last_breakable--)
 484     {
 485       if (Paper_column::is_breakable (ro_columns [last_breakable]))
 486         break;
 487     }
 488
 489   vector<Grob *> columns;
 490   for (int i = 0; i <= last_breakable; i++)
 491     {
 492       if (Paper_column::is_used (ro_columns[i]))
 493         columns.push_back (ro_columns[i]);
 494     }
 495
 496   return columns;
 497 }
 498
 499 Paper_column *
 500 System::column (vsize which) const
 501 {
 502   extract_grob_set (this, "columns", columns);
 503   if (which >= columns.size ())
 504     return 0;
 505
 506   return dynamic_cast<Paper_column *> (columns[which]);
 507 }
 508
 509 Paper_score *
 510 System::paper_score () const
 511 {
 512   return pscore_;
 513 }
 514
 515 int
 516 System::get_rank () const
 517 {
 518   return rank_;
 519 }
 520
 521 System *
 522 get_root_system (Grob *me)
 523 {
 524   Grob *system_grob = me;
 525
 526   while (system_grob->get_parent (Y_AXIS))
 527     system_grob = system_grob->get_parent (Y_AXIS);
 528
 529   return dynamic_cast<System *> (system_grob);
 530 }
 531
 532 Grob *
 533 System::get_vertical_alignment ()
 534 {
 535   extract_grob_set (this, "elements", elts);
 536   Grob *ret = 0;
 537   for (vsize i = 0; i < elts.size (); i++)
 538     if (Align_interface::has_interface (elts[i]))
 539       {
 540         if (ret)
 541           programming_error ("found multiple vertical alignments in this system");
 542         ret = elts[i];
 543       }
 544
 545   if (!ret)
 546     programming_error ("didn't find a vertical alignment in this system");
 547   return ret;
 548 }
 549
 550 // Finds the furthest staff in the given direction whose x-extent
 551 // overlaps with the given interval.
 552 Grob *
 553 System::get_extremal_staff (Direction dir, Interval const &iv)
 554 {
 555   Grob *align = get_vertical_alignment ();
 556   if (!align)
 557     return 0;
 558
 559   extract_grob_set (align, "elements", elts);
 560   vsize start = (dir == UP) ? 0 : elts.size () - 1;
 561   vsize end = (dir == UP) ? elts.size () : VPOS;
 562   for (vsize i = start; i != end; i += dir)
 563     {
 564       if (Hara_kiri_group_spanner::has_interface (elts[i]))
 565         Hara_kiri_group_spanner::consider_suicide (elts[i]);
 566
 567       Interval intersection = elts[i]->extent (this, X_AXIS);
 568       intersection.intersect (iv);
 569       if (elts[i]->is_live () && !intersection.is_empty ())
 570         return elts[i];
 571     }
 572   return 0;
 573 }
 574
 575 Interval
 576 System::pure_refpoint_extent (vsize start, vsize end)
 577 {
 578   Interval ret;
 579   Grob *alignment = get_vertical_alignment ();
 580   if (!alignment)
 581     return Interval ();
 582
 583   extract_grob_set (alignment, "elements", staves);
 584   vector<Real> offsets = Align_interface::get_pure_minimum_translations (alignment, staves, Y_AXIS, start, end);
 585
 586   for (vsize i = 0; i < offsets.size (); ++i)
 587     if (Page_layout_problem::is_spaceable (staves[i]))
 588       {
 589         ret[UP] = offsets[i];
 590         break;
 591       }
 592
 593   for (vsize i = offsets.size (); i--;)
 594     if (Page_layout_problem::is_spaceable (staves[i]))
 595       {
 596         ret[DOWN] = offsets[i];
 597         break;
 598       }
 599
 600   return ret;
 601 }
 602
 603 Interval
 604 System::part_of_line_pure_height (vsize start, vsize end, bool begin)
 605 {
 606   Grob *alignment = get_vertical_alignment ();
 607   if (!alignment)
 608     return Interval ();
 609
 610   extract_grob_set (alignment, "elements", staves);
 611   vector<Real> offsets = Align_interface::get_pure_minimum_translations (alignment, staves, Y_AXIS, start, end);
 612
 613   Interval ret;
 614   for (vsize i = 0; i < staves.size (); ++i)
 615     {
 616       Interval iv = begin
 617         ? Axis_group_interface::begin_of_line_pure_height (staves[i], start)
 618         : Axis_group_interface::rest_of_line_pure_height (staves[i], start, end);
 619       if (i < offsets.size ())
 620         iv.translate (offsets[i]);
 621       ret.unite (iv);
 622     }
 623
 624   Interval other_elements = begin
 625     ? Axis_group_interface::begin_of_line_pure_height (this, start)
 626     : Axis_group_interface::rest_of_line_pure_height (this, start, end);
 627
 628   ret.unite (other_elements);
 629
 630   return ret;
 631 }
 632
 633 Interval
 634 System::begin_of_line_pure_height (vsize start, vsize end)
 635 {
 636   return part_of_line_pure_height (start, end, true);
 637 }
 638
 639 Interval
 640 System::rest_of_line_pure_height (vsize start, vsize end)
 641 {
 642   return part_of_line_pure_height (start, end, false);
 643 }
 644
 645 // This differs from Axis_group_interface::calc_pure_relevant_grobs
 646 // because here, we are only interested in those few elements that aren't
 647 // descended from VerticalAlignment (ie. things like RehearsalMark, BarLine).
 648 MAKE_SCHEME_CALLBACK (System, calc_pure_relevant_grobs, 1);
 649 SCM
 650 System::calc_pure_relevant_grobs (SCM smob)
 651 {
 652   Grob *me = unsmob_grob (smob);
 653
 654   extract_grob_set (me, "elements", elts);
 655   vector<Grob *> relevant_grobs;
 656   SCM pure_relevant_p = ly_lily_module_constant ("pure-relevant?");
 657
 658   for (vsize i = 0; i < elts.size (); ++i)
 659     {
 660       if (!Axis_group_interface::has_interface (elts[i]))
 661         {
 662           if (to_boolean (scm_apply_1 (pure_relevant_p, elts[i]->self_scm (), SCM_EOL)))
 663             relevant_grobs.push_back (elts[i]);
 664
 665           if (Item *it = dynamic_cast<Item*> (elts[i]))
 666             {
 667               Direction d = LEFT;
 668               do
 669                 {
 670                   Item *piece = it->find_prebroken_piece (d);
 671                   if (piece && to_boolean (scm_apply_1 (pure_relevant_p, piece->self_scm (), SCM_EOL)))
 672                     relevant_grobs.push_back (piece);
 673                 }
 674               while (flip (&d) != LEFT);
 675             }
 676         }
 677     }
 678
 679   SCM grobs_scm = Grob_array::make_array ();
 680
 681   unsmob_grob_array (grobs_scm)->set_array (relevant_grobs);
 682   return grobs_scm;
 683 }
 684
 685 MAKE_SCHEME_CALLBACK (System, height, 1);
 686 SCM
 687 System::height (SCM smob)
 688 {
 689   return Axis_group_interface::height (smob);
 690 }
 691
 692 MAKE_SCHEME_CALLBACK (System, calc_pure_height, 3);
 693 SCM
 694 System::calc_pure_height (SCM smob, SCM start_scm, SCM end_scm)
 695 {
 696   System *me = dynamic_cast<System *> (unsmob_grob (smob));
 697   int start = scm_to_int (start_scm);
 698   int end = scm_to_int (end_scm);
 699
 700   Interval begin = me->begin_of_line_pure_height (start, end);
 701   Interval rest = me->rest_of_line_pure_height (start, end);
 702   begin.unite (rest);
 703
 704   return ly_interval2scm (begin);
 705 }
 706
 707 Grob*
 708 System::get_pure_bound (Direction d, int start, int end)
 709 {
 710   vector<vsize> ranks = pscore_->get_break_ranks ();
 711   vector<vsize> indices = pscore_->get_break_indices ();
 712   vector<Grob*> cols = pscore_->get_columns ();
 713
 714   vsize target_rank = (d == LEFT ? start : end);
 715   vector<vsize>::const_iterator i =
 716     lower_bound (ranks.begin (), ranks.end (), target_rank, std::less<vsize> ());
 717
 718   if (i != ranks.end () && (*i) == target_rank)
 719     return cols[indices[i - ranks.begin ()]];
 720   else
 721     return 0;
 722 }
 723
 724 Grob*
 725 System::get_maybe_pure_bound (Direction d, bool pure, int start, int end)
 726 {
 727   return pure ? get_pure_bound (d, start, end) : get_bound (d);
 728 }
 729
 730 ADD_INTERFACE (System,
 731                "This is the top-level object: Each object in a score"
 732                " ultimately has a @code{System} object as its X and"
 733                " Y@tie{}parent.",
 734
 735                /* properties */
 736                "all-elements "
 737                "columns "
 738                "labels "
 739                "pure-Y-extent "
 740                "skyline-horizontal-padding "
 741                );