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