lily/slur-scoring.cc

   1 /*
   2   slur-scoring.cc -- Score based slur formatting
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include <math.h>
  11
  12 #include "libc-extension.hh"
  13 #include "slur-configuration.hh"
  14 #include "slur-scoring.hh"
  15 #include "beam.hh"
  16 #include "directional-element-interface.hh"
  17 #include "group-interface.hh"
  18 #include "lily-guile.hh"
  19 #include "slur.hh"
  20 #include "note-column.hh"
  21 #include "output-def.hh"
  22 #include "pitch.hh"
  23 #include "bezier.hh"
  24 #include "spanner.hh"
  25 #include "staff-symbol-referencer.hh"
  26 #include "staff-symbol.hh"
  27 #include "stem.hh"
  28 #include "warn.hh"
  29 #include "paper-column.hh"
  30 #include "accidental-interface.hh"
  31
  32 /*
  33   TODO:
  34
  35   - curve around flag for y coordinate
  36
  37   - this file is a mess, clean it up
  38
  39   - short-cut: try a smaller region first.
  40
  41   - handle non-visible stems better.
  42
  43   - try to prune number of scoring criteria
  44
  45   - take encompass-objects more into account when determining
  46   slur shape
  47
  48   - calculate encompass scoring directly after determining slur shape.
  49
  50   - optimize.
  51
  52 */
  53 struct Slur_score_state;
  54
  55 Slur_score_state::Slur_score_state()
  56 {
  57   musical_dy_ = 0.0;
  58   valid_ = false;
  59   edge_has_beams_ = false;
  60   has_same_beam_ = false;
  61   is_broken_ = false;
  62   dir_ = CENTER;
  63   slur_ = 0;
  64   common_[X_AXIS] = 0;
  65   common_[Y_AXIS] = 0;
  66   scores_ = 0;
  67 }
  68
  69 Slur_score_state::~Slur_score_state ()
  70 {
  71   delete scores_;
  72 }
  73
  74
  75
  76
  77
  78 Real
  79 get_detail (SCM alist, SCM sym)
  80 {
  81   SCM entry = scm_assq (sym, alist);
  82   return robust_scm2double (scm_is_pair (entry)
  83                             ? scm_cdr (entry)
  84                             : SCM_EOL,
  85                             0.0);
  86 }
  87
  88 void
  89 init_score_param (Grob *me,
  90                   Slur_score_parameters *score_param)
  91 {
  92   SCM details = me->get_property ("slur-details");
  93
  94   score_param->region_size_
  95     = (int) get_detail (details, ly_symbol2scm ("region-size"));
  96   score_param->head_encompass_penalty_
  97     = get_detail (details, ly_symbol2scm ("head-encompass-penalty"));
  98   score_param->stem_encompass_penalty_
  99     = get_detail (details, ly_symbol2scm ("stem-encompass-penalty"));
 100   score_param->closeness_factor_
 101     = get_detail (details, ly_symbol2scm ("closeness-factor"));
 102   score_param->edge_attraction_factor_
 103     = get_detail (details, ly_symbol2scm ("edge-attraction-factor"));
 104   score_param->same_slope_penalty_
 105     = get_detail (details, ly_symbol2scm ("same-slope-penalty"));
 106   score_param->steeper_slope_factor_
 107     = get_detail (details, ly_symbol2scm ("steeper-slope-factor"));
 108   score_param->non_horizontal_penalty_
 109     = get_detail (details, ly_symbol2scm ("non-horizontal-penalty"));
 110   score_param->max_slope_
 111     = get_detail (details, ly_symbol2scm ("max-slope"));
 112   score_param->max_slope_factor_
 113     = get_detail (details, ly_symbol2scm ("max-slope-factor"));
 114   score_param->free_head_distance_
 115     = get_detail (details, ly_symbol2scm ("free-head-distance"));
 116   score_param->extra_object_collision_
 117     = get_detail (details, ly_symbol2scm ("extra-object-collision"));
 118   score_param->accidental_collision_
 119     = get_detail (details, ly_symbol2scm ("accidental-collision"));
 120   score_param->extra_encompass_free_distance_
 121     = get_detail (details, ly_symbol2scm ("extra-encompass-free-distance"));
 122   score_param->head_slur_distance_factor_
 123     = get_detail (details, ly_symbol2scm ("head-slur-distance-factor"));
 124   score_param->head_slur_distance_max_ratio_
 125     = get_detail (details, ly_symbol2scm ("head-slur-distance-max-ratio"));
 126   score_param->free_slur_distance_
 127     = get_detail (details, ly_symbol2scm ("free-slur-distance"));
 128   score_param->edge_slope_exponent_
 129     = get_detail (details, ly_symbol2scm ("edge-slope-exponent"));
 130 }
 131
 132 Real
 133 broken_trend_y (Slur_score_state const &state, Direction hdir)
 134 {
 135   /* A broken slur should maintain the same vertical trend
 136      the unbroken slur would have had.  */
 137   Real by = 0.0;
 138   if (Spanner *mother = dynamic_cast<Spanner*> (state.slur_->original_))
 139     {
 140       int k = broken_spanner_index (state.slur_);
 141       int j = k + hdir;
 142       if (j < 0 || j >= mother->broken_intos_.size ())
 143         return by;
 144
 145       Grob *neighbor = mother->broken_intos_[j];
 146       Spanner *common_mother
 147         = dynamic_cast<Spanner*> (state.common_[Y_AXIS]->original_);
 148       int common_k
 149         = broken_spanner_index (dynamic_cast<Spanner*> (state.common_[Y_AXIS]));
 150       int common_j = common_k + hdir;
 151
 152       if (common_j < 0 || common_j >= common_mother->broken_intos_.size ())
 153         return by;
 154
 155       Grob *common_next_system = common_mother->broken_intos_[common_j];
 156
 157       SCM last_point =  scm_car (scm_last_pair (neighbor->get_property ("control-points")));
 158
 159       return scm_to_double (scm_cdr (last_point))
 160         + neighbor->relative_coordinate (common_next_system, Y_AXIS);
 161     }
 162   return by;
 163 }
 164
 165
 166 /*
 167   copy slur dir forwards across line break.
 168 */
 169 void
 170 Slur_score_state::set_next_direction ()
 171 {
 172   if (extremes_[RIGHT].note_column_)
 173     return;
 174
 175   if (Spanner *mother = dynamic_cast<Spanner*> (slur_->original_))
 176     {
 177       int k = broken_spanner_index (slur_);
 178       int j = k + 1;
 179       if (j < 0 || j >= mother->broken_intos_.size ())
 180         return;
 181
 182       Grob *neighbor = mother->broken_intos_[j];
 183       set_grob_direction (neighbor, dir_);
 184     }
 185 }
 186
 187 Encompass_info
 188 Slur_score_state::get_encompass_info (Grob *col) const
 189 {
 190   Grob *stem = unsmob_grob (col->get_property ("stem"));
 191   Encompass_info ei;
 192
 193   if (!stem)
 194     {
 195       programming_error ("No stem for note column?");
 196       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 197       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 198                                          Y_AXIS)[dir_];
 199       return ei;
 200     }
 201   Direction stem_dir = get_grob_direction (stem);
 202
 203   if (Grob *head = Note_column::first_head (col))
 204     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 205   else
 206     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 207
 208   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 209   if (!h)
 210     {
 211       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 212       return ei;
 213     }
 214
 215   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 216
 217   if ((stem_dir == dir_)
 218       && !stem->extent (stem, Y_AXIS).is_empty ())
 219     {
 220       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 221       if (Grob *b = Stem::get_beam (stem))
 222         ei.stem_ += stem_dir * 0.5 * Beam::get_thickness (b);
 223
 224       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 225       ei.x_ = x.is_empty ()
 226         ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 227         : x.center ();
 228     }
 229   else
 230     ei.stem_ = ei.head_;
 231
 232   return ei;
 233 }
 234
 235
 236
 237
 238 Drul_array<Bound_info>
 239 Slur_score_state::get_bound_info () const
 240 {
 241   Drul_array<Bound_info> extremes;
 242
 243   Direction d = LEFT;
 244   Direction dir = dir_;
 245
 246   do
 247     {
 248       extremes[d].bound_ = slur_->get_bound (d);
 249       if (Note_column::has_interface (extremes[d].bound_))
 250         {
 251           extremes[d].note_column_ = extremes[d].bound_;
 252           extremes[d].stem_ = Note_column::get_stem (extremes[d].note_column_);
 253           extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 254           extremes[d].stem_extent_[X_AXIS]
 255             = extremes[d].stem_->extent (common_[X_AXIS], X_AXIS);
 256           extremes[d].stem_extent_[Y_AXIS]
 257             = extremes[d].stem_->extent (common_[Y_AXIS], Y_AXIS);
 258           extremes[d].slur_head_
 259             = Stem::extremal_heads (extremes[d].stem_)[dir];
 260           if (!extremes[d].slur_head_
 261               && Note_column::has_rests (extremes[d].bound_))
 262             {
 263               extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 264             }
 265
 266           if (extremes[d].slur_head_)
 267             extremes[d].slur_head_extent_
 268               = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 269
 270           extremes[d].staff_ = Staff_symbol_referencer
 271             ::get_staff_symbol (extremes[d].stem_);
 272           extremes[d].staff_space_ = Staff_symbol_referencer
 273             ::staff_space (extremes[d].stem_);
 274         }
 275     }
 276   while (flip (&d) != LEFT);
 277   return extremes;
 278 }
 279
 280 void
 281 Slur_score_state::fill (Grob *me)
 282 {
 283   slur_ = dynamic_cast<Spanner*> (me);
 284   columns_
 285     = Pointer_group_interface__extract_grobs (me, (Grob *) 0, "note-columns");
 286
 287   if (columns_.is_empty ())
 288     {
 289       me->suicide ();
 290       return ;
 291     }
 292
 293   staff_space_ = Staff_symbol_referencer::staff_space (me);
 294   Real lt = me->get_paper ()->get_dimension (ly_symbol2scm ("linethickness"));
 295   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) *  lt;
 296
 297   dir_ = get_grob_direction (me);
 298   init_score_param (me, &parameters_);
 299
 300   SCM eltlist = me->get_property ("note-columns");
 301   SCM extra_list = me->get_property ("encompass-objects");
 302   Spanner *sp = dynamic_cast<Spanner*> (me);
 303
 304   for (int i = X_AXIS; i < NO_AXES; i++)
 305     {
 306       Axis a = (Axis)i;
 307       common_[a] = common_refpoint_of_list (eltlist, me, a);
 308       common_[a] = common_refpoint_of_list (extra_list, common_[a], a);
 309
 310       Direction d = LEFT;
 311       do {
 312         common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 313       }
 314       while (flip (&d) != LEFT);
 315     }
 316
 317   extremes_ = get_bound_info ();
 318   is_broken_ = (!extremes_[LEFT].note_column_
 319                       || !extremes_[RIGHT].note_column_);
 320
 321
 322   base_attachments_ = get_base_attachments ();
 323
 324   Drul_array<Real> end_ys
 325     = get_y_attachment_range ();
 326
 327   scores_ = enumerate_attachments ( end_ys);
 328   for (int i = 0; i < columns_.size (); i++)
 329     encompass_infos_.push (get_encompass_info ( columns_[i]));
 330
 331   extra_encompass_infos_ = get_extra_encompass_infos ();
 332   valid_ = true;
 333
 334
 335   musical_dy_ = 0.0;
 336   Direction d = LEFT;
 337   do
 338     {
 339       if (!is_broken_)
 340         musical_dy_ += d
 341           * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 342     }
 343   while (flip (&d) != LEFT);
 344
 345   edge_has_beams_
 346     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 347     || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 348
 349   has_same_beam_ =
 350     (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 351      && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 352
 353
 354   set_next_direction ();
 355
 356   if (is_broken_)
 357     musical_dy_ = 0.0;
 358 }
 359
 360 void
 361 set_slur_control_points (Grob *me)
 362 {
 363   Slur_score_state state;
 364   state.fill (me);
 365
 366   if (!state.valid_)
 367     return;
 368
 369   state.generate_curves ();
 370   Bezier best (state.get_best_curve());
 371
 372
 373   SCM controls = SCM_EOL;
 374   for (int i = 4; i--;)
 375     {
 376       Offset o = best.control_[i]
 377         - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 378                   me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 379       controls = scm_cons (ly_offset2scm (o), controls);
 380     }
 381   me->set_property ("control-points", controls);
 382 }
 383
 384
 385 Bezier
 386 Slur_score_state::get_best_curve ()
 387 {
 388   for (int i = 0; i < scores_->size (); i++)
 389     {
 390       scores_->elem (i).score (*this);
 391     }
 392
 393   Real opt = 1e6;
 394   int opt_idx = -1;
 395   for (int i = 0; i < scores_->size (); i++)
 396     {
 397       if ((*scores_)[i].score_ < opt)
 398         {
 399           opt = (*scores_)[i].score_;
 400           opt_idx = i;
 401         }
 402     }
 403
 404 #if DEBUG_SLUR_SCORING
 405   SCM inspect_quants = slur_->get_property ("inspect-quants");
 406   if (to_boolean (slur_->get_paper ()
 407                   ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")))
 408       && scm_is_pair (inspect_quants))
 409     {
 410       Drul_array<Real> ins = ly_scm2interval (inspect_quants);
 411       Real mindist = 1e6;
 412       for (int i = 0; i < scores_->size (); i ++)
 413         {
 414           Real d =fabs ((*scores_)[i].attachment_[LEFT][Y_AXIS] - ins[LEFT])
 415             + fabs ((*scores_)[i].attachment_[RIGHT][Y_AXIS] - ins[RIGHT]);
 416           if (d < mindist)
 417             {
 418               opt_idx = i;
 419               mindist= d;
 420             }
 421         }
 422       if (mindist > 1e5)
 423         programming_error ("Could not find quant.");
 424     }
 425   (*scores_)[opt_idx].score_card_ += to_string ("i%d", opt_idx);
 426
 427   // debug quanting
 428   slur_->set_property ("quant-score",
 429                     scm_makfrom0str ((*scores_)[opt_idx].score_card_.to_str0 ()));
 430 #endif
 431
 432   return scores_->elem (opt_idx).curve_;
 433 }
 434
 435 /*
 436   TODO: should analyse encompasses to determine sensible region, and
 437   should limit slopes available.
 438  */
 439
 440 Drul_array<Real>
 441 Slur_score_state::get_y_attachment_range () const
 442 {
 443   Drul_array<Real> end_ys;
 444   Direction d = LEFT;
 445   do
 446     {
 447       if (extremes_[d].note_column_)
 448         {
 449           end_ys[d] = dir_
 450             * ((dir_ * (base_attachments_[d][Y_AXIS] +  parameters_.region_size_* dir_))
 451                >? (dir_ * (dir_ + extremes_[d].note_column_->extent (common_[Y_AXIS],
 452                                                                  Y_AXIS)[dir_]))
 453                >? (dir_ * base_attachments_[-d][Y_AXIS]));
 454         }
 455       else
 456         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 457     }
 458   while (flip (&d) != LEFT);
 459
 460   return end_ys;
 461 }
 462
 463 bool
 464 spanner_less (Spanner *s1, Spanner* s2)
 465 {
 466   Slice b1, b2;
 467   Direction d  = LEFT;
 468   do
 469     {
 470       b1[d] = s1->get_bound (d)->get_column ()->rank_;
 471       b2[d] = s2->get_bound (d)->get_column ()->rank_;
 472     } while (flip (&d) != LEFT);
 473
 474   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 475     && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 476 }
 477
 478
 479 Drul_array<Offset>
 480 Slur_score_state::get_base_attachments () const
 481 {
 482   Drul_array<Offset> base_attachment;
 483   Direction d = LEFT;
 484   do
 485     {
 486       Grob *stem = extremes_[d].stem_;
 487       Grob *head = extremes_[d].slur_head_;
 488
 489       Real x = 0.0;
 490       Real y = 0.0;
 491       if (extremes_[d].note_column_)
 492         {
 493
 494           /*
 495             fixme: X coord should also be set in this case.
 496            */
 497           if (stem
 498               && extremes_[d].stem_dir_ == dir_
 499               && Stem::get_beaming (stem, -d)
 500               && (!spanner_less (slur_, Stem::get_beam (stem))
 501                   || has_same_beam_))
 502             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 503           else if (head)
 504             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 505           y += dir_ * 0.5 * staff_space_;
 506
 507           Real pos
 508             = (y - extremes_[d].staff_->relative_coordinate (common_[Y_AXIS],
 509                                                             Y_AXIS))
 510             * 2.0 / staff_space_;
 511
 512           /* start off staffline. */
 513           if (fabs (pos - my_round (pos)) < 0.2
 514               && Staff_symbol_referencer::on_staffline (head, (int) rint (pos))
 515               && Staff_symbol_referencer::line_count (head) - 1 >= rint (pos)
 516               )
 517             // TODO: calc from slur thick & line thick, parameter.
 518             y += 1.5 * staff_space_ * dir_ / 10;
 519
 520           Grob * fh = Note_column::first_head (extremes_[d].note_column_);
 521           x =
 522          (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 523              : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 524             .linear_combination (CENTER);
 525         }
 526       base_attachment[d] = Offset (x, y);
 527
 528     } while (flip (&d) != LEFT);
 529
 530   do
 531     {
 532       if (!extremes_[d].note_column_)
 533         {
 534           Real x, y;
 535           if (d == RIGHT)
 536             {
 537               x = extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS)[d];
 538             }
 539           else
 540             {
 541               x = slur_->get_broken_left_end_align ();
 542             }
 543           Grob * col = (d == LEFT) ? columns_[0] : columns_.top();
 544
 545           if (extremes_[-d].bound_ != col)
 546             {
 547               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 548               if (get_grob_direction (col) == dir_)
 549                 y -= dir_ ;
 550             }
 551           else
 552             y = base_attachment[-d][Y_AXIS];
 553
 554           base_attachment[d] = Offset (x, y);
 555         }
 556     }
 557   while (flip (&d) != LEFT);
 558
 559   return base_attachment;
 560 }
 561
 562 void
 563 Slur_score_state::generate_curves () const
 564 {
 565   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 566   Real h_inf = staff_space_ *scm_to_double (slur_->get_property ("height-limit"));
 567   for (int i = 0; i < scores_->size (); i++)
 568     scores_->elem(i).generate_curve (*this, r_0, h_inf);
 569 }
 570
 571
 572
 573
 574 Array<Slur_configuration> *
 575 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 576 {
 577   /*ugh.   */
 578   Array<Slur_configuration> scores;
 579
 580
 581   Drul_array<Offset> os;
 582   os[LEFT] = base_attachments_[LEFT];
 583   Real minimum_length = staff_space_
 584     * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 585
 586   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 587     {
 588       os[RIGHT] = base_attachments_[RIGHT];
 589       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 590         {
 591           Slur_configuration s;
 592           Direction d = LEFT;
 593           Drul_array<bool> attach_to_stem (false, false);
 594           do
 595             {
 596               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 597               if (extremes_[d].stem_
 598                   && !Stem::is_invisible (extremes_[d].stem_)
 599                   && extremes_[d].stem_dir_ == dir_)
 600                 {
 601                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 602                   stem_y.widen (0.25 * staff_space_);
 603                   if (dir_ == -d
 604                       && stem_y.contains (os[d][Y_AXIS]))
 605                     {
 606                       os[d][X_AXIS] =  extremes_[d].slur_head_extent_[-d]
 607                         - d * 0.3;
 608                       attach_to_stem[d] = true;
 609                     }
 610                   else if (dir_ *extremes_[d].stem_extent_[Y_AXIS][dir_]
 611                              < dir_ * os[d][Y_AXIS]
 612                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ()
 613                            )
 614
 615                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 616                 }
 617             }
 618           while (flip (&d) != LEFT);
 619
 620           Offset dz;
 621           dz = os[RIGHT] - os[LEFT];
 622           if (dz[X_AXIS] < minimum_length
 623               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_
 624               )
 625             {
 626               do
 627                 {
 628                   if (extremes_[d].slur_head_)
 629                     {
 630                       os[d][X_AXIS] = extremes_[d].slur_head_extent_.center ();
 631                       attach_to_stem[d] = false;
 632                     }
 633                 }
 634               while (flip (&d) != LEFT);
 635             }
 636
 637           dz = os[RIGHT] - os[LEFT];
 638           do
 639             {
 640               if (extremes_[d].slur_head_
 641                   && !attach_to_stem[d])
 642                 {
 643                   /* Horizontally move tilted slurs a little.  Move
 644                      more for bigger tilts.
 645
 646                      TODO: parameter */
 647                   os[d][X_AXIS]
 648                     -= dir_ * extremes_[d].slur_head_extent_.length ()
 649                     * sin (dz.arg ()) / 3;
 650                 }
 651             }
 652           while (flip (&d) != LEFT);
 653
 654           s.attachment_ = os;
 655           scores.push (s);
 656
 657           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 658         }
 659
 660       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 661     }
 662
 663   assert (scores.size () > 0);
 664   return new Array<Slur_configuration> (scores);
 665 }
 666
 667
 668 Array<Extra_collision_info>
 669 Slur_score_state::get_extra_encompass_infos ( ) const
 670 {
 671   Link_array<Grob> encompasses
 672     = Pointer_group_interface__extract_grobs (slur_, (Grob *)0,
 673                                               "encompass-objects");
 674   Array<Extra_collision_info> collision_infos;
 675   for (int i = encompasses.size (); i--; )
 676     {
 677       if (Slur::has_interface (encompasses[i]))
 678         {
 679           Spanner * small_slur = dynamic_cast<Spanner*> (encompasses[i]);
 680           Bezier b = Slur::get_curve (small_slur);
 681
 682           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 683                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 684
 685           for (int k = 0; k < 3; k++)
 686             {
 687               Direction hdir =  Direction (k /2 - 1);
 688
 689               /*
 690                 Only take bound into account if small slur starts
 691                 together with big slur.
 692               */
 693               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 694                 continue;
 695
 696
 697               Offset z = b.curve_point ( k / 2.0);
 698               z += relative;
 699
 700               Interval yext;
 701               yext.set_full ();
 702               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 703
 704               Interval xext (-1, 1);
 705               xext = xext * (thickness_*2) + z[X_AXIS];
 706               Extra_collision_info info (small_slur,
 707                                          k - 1.0,
 708                                          xext,
 709                                          yext,
 710                                          parameters_.extra_object_collision_);
 711               collision_infos.push (info);
 712             }
 713         }
 714       else
 715         {
 716           Grob *g = encompasses [i];
 717           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 718           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 719
 720           Real xp = 0.0;
 721           Real penalty = parameters_.extra_object_collision_;
 722           if (Accidental_interface::has_interface (g))
 723             {
 724               penalty = parameters_.accidental_collision_;
 725               /* Begin copy accidental.cc */
 726               bool parens = false;
 727               if (to_boolean (g->get_property ("cautionary")))
 728                 {
 729                   SCM cstyle = g->get_property ("cautionary-style");
 730                   parens = ly_c_equal_p (cstyle, ly_symbol2scm ("parentheses"));
 731                 }
 732
 733               SCM accs = g->get_property ("accidentals");
 734               SCM scm_style = g->get_property ("style");
 735               if (!scm_is_symbol (scm_style)
 736                   && !parens
 737                   && scm_ilength (accs) == 1)
 738                 {
 739                   /* End copy accidental.cc */
 740                   switch (scm_to_int (scm_car (accs)))
 741                     {
 742                     case FLAT:
 743                     case DOUBLE_FLAT:
 744                       xp = LEFT;
 745                       break ;
 746                     case SHARP:
 747                       xp = 0.5 * dir_;
 748                       break ;
 749                     case NATURAL:
 750                       xp = -dir_;
 751                       break;
 752                     }
 753                 }
 754             }
 755
 756           ye.widen (thickness_ * 0.5);
 757           xe.widen (thickness_ * 1.0);
 758           Extra_collision_info info (g, xp, xe, ye,  penalty);
 759           collision_infos.push (info);
 760         }
 761     }
 762
 763   return collision_infos;
 764 }
 765