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--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10
  11 #include <math.h>
  12
  13 #include "slur-scoring.hh"
  14 #include "libc-extension.hh"
  15 #include "slur-configuration.hh"
  16 #include "beam.hh"
  17 #include "directional-element-interface.hh"
  18 #include "group-interface.hh"
  19 #include "slur.hh"
  20 #include "note-column.hh"
  21 #include "output-def.hh"
  22 #include "pitch.hh"
  23 #include "spanner.hh"
  24 #include "staff-symbol-referencer.hh"
  25 #include "staff-symbol.hh"
  26 #include "stem.hh"
  27 #include "warn.hh"
  28 #include "paper-column.hh"
  29 #include "accidental-interface.hh"
  30
  31 /*
  32   TODO:
  33
  34   - curve around flag for y coordinate
  35
  36   - this file is a mess, clean it up
  37
  38   - short-cut: try a smaller region first.
  39
  40   - handle non-visible stems better.
  41
  42   - try to prune number of scoring criteria
  43
  44   - take encompass-objects more into account when determining
  45   slur shape
  46
  47   - calculate encompass scoring directly after determining slur shape.
  48
  49   - optimize.
  50
  51 */
  52 struct Slur_score_state;
  53
  54 Slur_score_state::Slur_score_state()
  55 {
  56   musical_dy_ = 0.0;
  57   valid_ = false;
  58   edge_has_beams_ = false;
  59   has_same_beam_ = false;
  60   is_broken_ = false;
  61   dir_ = CENTER;
  62   slur_ = 0;
  63   common_[X_AXIS] = 0;
  64   common_[Y_AXIS] = 0;
  65 }
  66
  67 Slur_score_state::~Slur_score_state ()
  68 {
  69   junk_pointers (configurations_);
  70 }
  71
  72 Real
  73 get_detail (SCM alist, SCM sym)
  74 {
  75   SCM entry = scm_assq (sym, alist);
  76   return robust_scm2double (scm_is_pair (entry)
  77                             ? scm_cdr (entry)
  78                             : SCM_EOL,
  79                             0.0);
  80 }
  81
  82 void
  83 Slur_score_parameters::fill (Grob *me)
  84 {
  85   SCM details = me->get_property ("slur-details");
  86
  87   region_size_
  88     = (int) get_detail (details, ly_symbol2scm ("region-size"));
  89   head_encompass_penalty_
  90     = get_detail (details, ly_symbol2scm ("head-encompass-penalty"));
  91   stem_encompass_penalty_
  92     = get_detail (details, ly_symbol2scm ("stem-encompass-penalty"));
  93   closeness_factor_
  94     = get_detail (details, ly_symbol2scm ("closeness-factor"));
  95   edge_attraction_factor_
  96     = get_detail (details, ly_symbol2scm ("edge-attraction-factor"));
  97   same_slope_penalty_
  98     = get_detail (details, ly_symbol2scm ("same-slope-penalty"));
  99   steeper_slope_factor_
 100     = get_detail (details, ly_symbol2scm ("steeper-slope-factor"));
 101   non_horizontal_penalty_
 102     = get_detail (details, ly_symbol2scm ("non-horizontal-penalty"));
 103   max_slope_
 104     = get_detail (details, ly_symbol2scm ("max-slope"));
 105   max_slope_factor_
 106     = get_detail (details, ly_symbol2scm ("max-slope-factor"));
 107   free_head_distance_
 108     = get_detail (details, ly_symbol2scm ("free-head-distance"));
 109   absolute_closeness_measure_
 110     = get_detail (details, ly_symbol2scm ("absolute-closeness-measure"));
 111   extra_object_collision_
 112     = get_detail (details, ly_symbol2scm ("extra-object-collision"));
 113   accidental_collision_
 114     = get_detail (details, ly_symbol2scm ("accidental-collision"));
 115   extra_encompass_free_distance_
 116     = get_detail (details, ly_symbol2scm ("extra-encompass-free-distance"));
 117   head_slur_distance_factor_
 118     = get_detail (details, ly_symbol2scm ("head-slur-distance-factor"));
 119   head_slur_distance_max_ratio_
 120     = get_detail (details, ly_symbol2scm ("head-slur-distance-max-ratio"));
 121   free_slur_distance_
 122     = get_detail (details, ly_symbol2scm ("free-slur-distance"));
 123   edge_slope_exponent_
 124     = get_detail (details, ly_symbol2scm ("edge-slope-exponent"));
 125 }
 126
 127 Real
 128 broken_trend_y (Slur_score_state const &state, Direction hdir)
 129 {
 130   /* A broken slur should maintain the same vertical trend
 131      the unbroken slur would have had.  */
 132   Real by = 0.0;
 133   if (Spanner *mother = dynamic_cast<Spanner*> (state.slur_->original_))
 134     {
 135       int k = broken_spanner_index (state.slur_);
 136       int j = k + hdir;
 137       if (j < 0 || j >= mother->broken_intos_.size ())
 138         return by;
 139
 140       Grob *neighbor = mother->broken_intos_[j];
 141       Spanner *common_mother
 142         = dynamic_cast<Spanner*> (state.common_[Y_AXIS]->original_);
 143       int common_k
 144         = broken_spanner_index (dynamic_cast<Spanner*> (state.common_[Y_AXIS]));
 145       int common_j = common_k + hdir;
 146
 147       if (common_j < 0 || common_j >= common_mother->broken_intos_.size ())
 148         return by;
 149
 150       Grob *common_next_system = common_mother->broken_intos_[common_j];
 151
 152       SCM last_point =  scm_car (scm_last_pair (neighbor->get_property ("control-points")));
 153
 154       return scm_to_double (scm_cdr (last_point))
 155         + neighbor->relative_coordinate (common_next_system, Y_AXIS);
 156     }
 157   return by;
 158 }
 159
 160
 161 /*
 162   copy slur dir forwards across line break.
 163 */
 164 void
 165 Slur_score_state::set_next_direction ()
 166 {
 167   if (extremes_[RIGHT].note_column_)
 168     return;
 169
 170   if (Spanner *mother = dynamic_cast<Spanner*> (slur_->original_))
 171     {
 172       int k = broken_spanner_index (slur_);
 173       int j = k + 1;
 174       if (j < 0 || j >= mother->broken_intos_.size ())
 175         return;
 176
 177       Grob *neighbor = mother->broken_intos_[j];
 178       set_grob_direction (neighbor, dir_);
 179     }
 180 }
 181
 182 Encompass_info
 183 Slur_score_state::get_encompass_info (Grob *col) const
 184 {
 185   Grob *stem = unsmob_grob (col->get_property ("stem"));
 186   Encompass_info ei;
 187
 188   if (!stem)
 189     {
 190       programming_error ("No stem for note column?");
 191       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 192       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 193                                          Y_AXIS)[dir_];
 194       return ei;
 195     }
 196   Direction stem_dir = get_grob_direction (stem);
 197
 198   if (Grob *head = Note_column::first_head (col))
 199     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 200   else
 201     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 202
 203   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 204   if (!h)
 205     {
 206       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 207       return ei;
 208     }
 209
 210   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 211
 212   if ((stem_dir == dir_)
 213       && !stem->extent (stem, Y_AXIS).is_empty ())
 214     {
 215       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 216       if (Grob *b = Stem::get_beam (stem))
 217         ei.stem_ += stem_dir * 0.5 * Beam::get_thickness (b);
 218
 219       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 220       ei.x_ = x.is_empty ()
 221         ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 222         : x.center ();
 223     }
 224   else
 225     ei.stem_ = ei.head_;
 226
 227   return ei;
 228 }
 229
 230
 231
 232
 233 Drul_array<Bound_info>
 234 Slur_score_state::get_bound_info () const
 235 {
 236   Drul_array<Bound_info> extremes;
 237
 238   Direction d = LEFT;
 239   Direction dir = dir_;
 240
 241   do
 242     {
 243       extremes[d].bound_ = slur_->get_bound (d);
 244       if (Note_column::has_interface (extremes[d].bound_))
 245         {
 246           extremes[d].note_column_ = extremes[d].bound_;
 247           extremes[d].stem_ = Note_column::get_stem (extremes[d].note_column_);
 248           extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 249           extremes[d].stem_extent_[X_AXIS]
 250             = extremes[d].stem_->extent (common_[X_AXIS], X_AXIS);
 251           extremes[d].stem_extent_[Y_AXIS]
 252             = extremes[d].stem_->extent (common_[Y_AXIS], Y_AXIS);
 253           extremes[d].slur_head_
 254             = Stem::extremal_heads (extremes[d].stem_)[dir];
 255           if (!extremes[d].slur_head_
 256               && Note_column::has_rests (extremes[d].bound_))
 257             {
 258               extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 259             }
 260
 261           if (extremes[d].slur_head_)
 262             extremes[d].slur_head_extent_
 263               = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 264
 265           extremes[d].staff_ = Staff_symbol_referencer
 266             ::get_staff_symbol (extremes[d].stem_);
 267           extremes[d].staff_space_ = Staff_symbol_referencer
 268             ::staff_space (extremes[d].stem_);
 269         }
 270     }
 271   while (flip (&d) != LEFT);
 272   return extremes;
 273 }
 274
 275 void
 276 Slur_score_state::fill (Grob *me)
 277 {
 278   slur_ = dynamic_cast<Spanner*> (me);
 279   columns_
 280     = Pointer_group_interface__extract_grobs (me, (Grob *) 0, "note-columns");
 281
 282   if (columns_.is_empty ())
 283     {
 284       me->suicide ();
 285       return ;
 286     }
 287
 288   staff_space_ = Staff_symbol_referencer::staff_space (me);
 289   Real lt = me->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
 290   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) *  lt;
 291
 292   dir_ = get_grob_direction (me);
 293   parameters_.fill (me);
 294
 295   SCM eltlist = me->get_property ("note-columns");
 296   SCM extra_list = me->get_property ("encompass-objects");
 297   Spanner *sp = dynamic_cast<Spanner*> (me);
 298
 299   for (int i = X_AXIS; i < NO_AXES; i++)
 300     {
 301       Axis a = (Axis)i;
 302       common_[a] = common_refpoint_of_list (eltlist, me, a);
 303       common_[a] = common_refpoint_of_list (extra_list, common_[a], a);
 304
 305       Direction d = LEFT;
 306       do {
 307         /*
 308           If bound is not in note-columns, we don't want to know about
 309           its Y-position
 310          */
 311         if (a != Y_AXIS)
 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   has_same_beam_ =
 322     (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 323      && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 324
 325   base_attachments_ = get_base_attachments ();
 326
 327   Drul_array<Real> end_ys
 328     = get_y_attachment_range ();
 329
 330   configurations_ = enumerate_attachments ( end_ys);
 331   for (int i = 0; i < columns_.size (); i++)
 332     encompass_infos_.push (get_encompass_info ( columns_[i]));
 333
 334   extra_encompass_infos_ = get_extra_encompass_infos ();
 335   valid_ = true;
 336
 337
 338   musical_dy_ = 0.0;
 339   Direction d = LEFT;
 340   do
 341     {
 342       if (!is_broken_)
 343         musical_dy_ += d
 344           * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 345     }
 346   while (flip (&d) != LEFT);
 347
 348   edge_has_beams_
 349     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 350     || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 351
 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
 371   SCM end_ys = me->get_property ("positions");
 372   Bezier best;
 373
 374   if (is_number_pair (end_ys))
 375     {
 376       best = state.configurations_[state.get_closest_index (end_ys)]->curve_;
 377     }
 378   else
 379     {
 380       best = state.get_best_curve();
 381     }
 382
 383   SCM controls = SCM_EOL;
 384   for (int i = 4; i--;)
 385     {
 386       Offset o = best.control_[i]
 387         - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 388                   me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 389       controls = scm_cons (ly_offset2scm (o), controls);
 390     }
 391   me->set_property ("control-points", controls);
 392 }
 393
 394
 395 Bezier
 396 Slur_score_state::get_best_curve ()
 397 {
 398   for (int i = 0; i < configurations_.size (); i++)
 399     {
 400       configurations_[i]->score (*this);
 401     }
 402
 403   Real opt = 1e6;
 404   int opt_idx = -1;
 405   for (int i = 0; i < configurations_.size (); i++)
 406     {
 407       if (configurations_[i]->score_ < opt)
 408         {
 409           opt = configurations_[i]->score_;
 410           opt_idx = i;
 411         }
 412     }
 413
 414 #if DEBUG_SLUR_SCORING
 415   SCM inspect_quants = slur_->get_property ("inspect-quants");
 416   if (to_boolean (slur_->get_layout ()
 417                   ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")))
 418       && scm_is_pair (inspect_quants))
 419     opt_idx = get_closest_index (inspect_quants);
 420
 421   configurations_[opt_idx]->score_card_ += to_string ("=%.2f", opt);
 422   configurations_[opt_idx]->score_card_ += to_string ("i%d", opt_idx);
 423
 424   // debug quanting
 425   slur_->set_property ("quant-score",
 426                        scm_makfrom0str (configurations_[opt_idx]->score_card_.to_str0 ()));
 427
 428 #endif
 429
 430   return configurations_[opt_idx]->curve_;
 431 }
 432
 433 int
 434 Slur_score_state::get_closest_index (SCM inspect_quants) const
 435 {
 436   Drul_array<Real> ins = ly_scm2interval (inspect_quants);
 437
 438   int opt_idx = -1;
 439   Real mindist = 1e6;
 440   for (int i = 0; i < configurations_.size (); i ++)
 441     {
 442       Real d = fabs (configurations_[i]->attachment_[LEFT][Y_AXIS] - ins[LEFT])
 443         + fabs (configurations_[i]->attachment_[RIGHT][Y_AXIS] - ins[RIGHT]);
 444       if (d < mindist)
 445         {
 446           opt_idx = i;
 447           mindist = d;
 448         }
 449     }
 450   if (mindist > 1e5)
 451     programming_error ("Could not find quant.");
 452   return opt_idx;
 453 }
 454
 455 /*
 456   TODO: should analyse encompasses to determine sensible region, and
 457   should limit slopes available.
 458  */
 459
 460 Drul_array<Real>
 461 Slur_score_state::get_y_attachment_range () const
 462 {
 463   Drul_array<Real> end_ys;
 464   Direction d = LEFT;
 465   do
 466     {
 467       if (extremes_[d].note_column_)
 468         {
 469           end_ys[d] = dir_
 470             * ((dir_ * (base_attachments_[d][Y_AXIS] +  parameters_.region_size_* dir_))
 471                >? (dir_ * (dir_ + extremes_[d].note_column_->extent (common_[Y_AXIS],
 472                                                                  Y_AXIS)[dir_]))
 473                >? (dir_ * base_attachments_[-d][Y_AXIS]));
 474         }
 475       else
 476         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 477     }
 478   while (flip (&d) != LEFT);
 479
 480   return end_ys;
 481 }
 482
 483 bool
 484 spanner_less (Spanner *s1, Spanner* s2)
 485 {
 486   Slice b1, b2;
 487   Direction d  = LEFT;
 488   do
 489     {
 490       b1[d] = s1->get_bound (d)->get_column ()->rank_;
 491       b2[d] = s2->get_bound (d)->get_column ()->rank_;
 492     } while (flip (&d) != LEFT);
 493
 494   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 495     && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 496 }
 497
 498
 499 Drul_array<Offset>
 500 Slur_score_state::get_base_attachments () const
 501 {
 502   Drul_array<Offset> base_attachment;
 503   Direction d = LEFT;
 504   do
 505     {
 506       Grob *stem = extremes_[d].stem_;
 507       Grob *head = extremes_[d].slur_head_;
 508
 509       Real x = 0.0;
 510       Real y = 0.0;
 511       if (extremes_[d].note_column_)
 512         {
 513
 514           /*
 515             fixme: X coord should also be set in this case.
 516            */
 517           if (stem
 518               && extremes_[d].stem_dir_ == dir_
 519               && Stem::get_beaming (stem, -d)
 520               && (!spanner_less (slur_, Stem::get_beam (stem))
 521                   || has_same_beam_))
 522             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 523           else if (head)
 524             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 525           y += dir_ * 0.5 * staff_space_;
 526
 527
 528           y = move_away_from_staffline (y, head);
 529
 530           Grob * fh = Note_column::first_head (extremes_[d].note_column_);
 531           x =
 532          (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 533              : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 534             .linear_combination (CENTER);
 535         }
 536       base_attachment[d] = Offset (x, y);
 537
 538     } while (flip (&d) != LEFT);
 539
 540   do
 541     {
 542       if (!extremes_[d].note_column_)
 543         {
 544           Real x, y;
 545           if (d == RIGHT)
 546             {
 547               x = extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS)[d];
 548             }
 549           else
 550             {
 551               x = slur_->get_broken_left_end_align ();
 552             }
 553           Grob * col = (d == LEFT) ? columns_[0] : columns_.top();
 554
 555           if (extremes_[-d].bound_ != col)
 556             {
 557               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 558               y += dir_ * 0.5 * staff_space_;
 559
 560               if (get_grob_direction (col) == dir_
 561                   && Note_column::get_stem (col)
 562                   && !Stem::is_invisible (Note_column::get_stem (col)))
 563                 y -= dir_ * 1.5 * staff_space_;
 564             }
 565           else
 566             y = base_attachment[-d][Y_AXIS];
 567
 568
 569           y = move_away_from_staffline (y, col);
 570
 571           base_attachment[d] = Offset (x, y);
 572         }
 573     }
 574   while (flip (&d) != LEFT);
 575
 576   return base_attachment;
 577 }
 578
 579 Real
 580 Slur_score_state::move_away_from_staffline (Real y,
 581                                             Grob *on_staff) const
 582 {
 583   Real pos
 584     = (y - Staff_symbol_referencer::get_staff_symbol (on_staff)->relative_coordinate (common_[Y_AXIS],
 585                                                                                Y_AXIS))
 586     * 2.0 / staff_space_;
 587
 588   if (fabs (pos - my_round (pos)) < 0.2
 589       && Staff_symbol_referencer::on_staffline (on_staff, (int) rint (pos))
 590       && Staff_symbol_referencer::line_count (on_staff) - 1 >= rint (pos)
 591       )
 592     y += 1.5 * staff_space_ * dir_ / 10;
 593
 594   return y;
 595 }
 596
 597 void
 598 Slur_score_state::generate_curves () const
 599 {
 600   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 601   Real h_inf = staff_space_ *scm_to_double (slur_->get_property ("height-limit"));
 602   for (int i = 0; i < configurations_.size (); i++)
 603     configurations_[i]->generate_curve (*this, r_0, h_inf);
 604 }
 605
 606
 607
 608
 609 Link_array<Slur_configuration>
 610 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 611 {
 612   /*ugh.   */
 613   Link_array<Slur_configuration> scores;
 614
 615
 616   Drul_array<Offset> os;
 617   os[LEFT] = base_attachments_[LEFT];
 618   Real minimum_length = staff_space_
 619     * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 620
 621   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 622     {
 623       os[RIGHT] = base_attachments_[RIGHT];
 624       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 625         {
 626           Slur_configuration s;
 627           Direction d = LEFT;
 628           Drul_array<bool> attach_to_stem (false, false);
 629           do
 630             {
 631               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 632               if (extremes_[d].stem_
 633                   && !Stem::is_invisible (extremes_[d].stem_)
 634                   && extremes_[d].stem_dir_ == dir_)
 635                 {
 636                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 637                   stem_y.widen (0.25 * staff_space_);
 638                   if (stem_y.contains (os[d][Y_AXIS]))
 639                     {
 640                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 641                         - d * 0.3;
 642                       attach_to_stem[d] = true;
 643                     }
 644                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 645                            < dir_ * os[d][Y_AXIS]
 646                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ()
 647                            )
 648
 649                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 650                 }
 651             }
 652           while (flip (&d) != LEFT);
 653
 654           Offset dz;
 655           dz = os[RIGHT] - os[LEFT];
 656           if (dz[X_AXIS] < minimum_length
 657               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_
 658               )
 659             {
 660               do
 661                 {
 662                   if (extremes_[d].slur_head_)
 663                     {
 664                       os[d][X_AXIS] = extremes_[d].slur_head_extent_.center ();
 665                       attach_to_stem[d] = false;
 666                     }
 667                 }
 668               while (flip (&d) != LEFT);
 669             }
 670
 671           dz = os[RIGHT] - os[LEFT];
 672           do
 673             {
 674               if (extremes_[d].slur_head_
 675                   && !attach_to_stem[d])
 676                 {
 677                   /* Horizontally move tilted slurs a little.  Move
 678                      more for bigger tilts.
 679
 680                      TODO: parameter */
 681                   os[d][X_AXIS]
 682                     -= dir_ * extremes_[d].slur_head_extent_.length ()
 683                     * sin (dz.arg ()) / 3;
 684                 }
 685             }
 686           while (flip (&d) != LEFT);
 687
 688           s.attachment_ = os;
 689           s.index_ = scores.size ();
 690
 691           scores.push (new Slur_configuration (s));
 692
 693           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 694         }
 695
 696       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 697     }
 698
 699   assert (scores.size () > 0);
 700   return scores;
 701 }
 702
 703
 704 Array<Extra_collision_info>
 705 Slur_score_state::get_extra_encompass_infos () const
 706 {
 707   Link_array<Grob> encompasses
 708     = Pointer_group_interface__extract_grobs (slur_, (Grob *)0,
 709                                               "encompass-objects");
 710   Array<Extra_collision_info> collision_infos;
 711   for (int i = encompasses.size (); i--; )
 712     {
 713       if (Slur::has_interface (encompasses[i]))
 714         {
 715           Spanner * small_slur = dynamic_cast<Spanner*> (encompasses[i]);
 716           Bezier b = Slur::get_curve (small_slur);
 717
 718           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 719                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 720
 721           for (int k = 0; k < 3; k++)
 722             {
 723               Direction hdir =  Direction (k /2 - 1);
 724
 725               /*
 726                 Only take bound into account if small slur starts
 727                 together with big slur.
 728               */
 729               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 730                 continue;
 731
 732               Offset z = b.curve_point (k / 2.0);
 733               z += relative;
 734
 735               Interval yext;
 736               yext.set_full ();
 737               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 738
 739               Interval xext (-1, 1);
 740               xext = xext * (thickness_*2) + z[X_AXIS];
 741               Extra_collision_info info (small_slur,
 742                                          k - 1.0,
 743                                          xext,
 744                                          yext,
 745                                          parameters_.extra_object_collision_);
 746               collision_infos.push (info);
 747             }
 748         }
 749       else
 750         {
 751           Grob *g = encompasses [i];
 752           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 753           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 754
 755           Real xp = 0.0;
 756           Real penalty = parameters_.extra_object_collision_;
 757           if (Accidental_interface::has_interface (g))
 758             {
 759               penalty = parameters_.accidental_collision_;
 760               /* Begin copy accidental.cc */
 761               bool parens = false;
 762               if (to_boolean (g->get_property ("cautionary")))
 763                 {
 764                   SCM cstyle = g->get_property ("cautionary-style");
 765                   parens = ly_c_equal_p (cstyle, ly_symbol2scm ("parentheses"));
 766                 }
 767
 768               SCM accs = g->get_property ("accidentals");
 769               SCM scm_style = g->get_property ("style");
 770               if (!scm_is_symbol (scm_style)
 771                   && !parens
 772                   && scm_ilength (accs) == 1)
 773                 {
 774                   /* End copy accidental.cc */
 775                   switch (scm_to_int (scm_car (accs)))
 776                     {
 777                     case FLAT:
 778                     case DOUBLE_FLAT:
 779                       xp = LEFT;
 780                       break ;
 781                     case SHARP:
 782                       xp = 0.5 * dir_;
 783                       break ;
 784                     case NATURAL:
 785                       xp = -dir_;
 786                       break;
 787                     }
 788                 }
 789             }
 790
 791           ye.widen (thickness_ * 0.5);
 792           xe.widen (thickness_ * 1.0);
 793           Extra_collision_info info (g, xp, xe, ye,  penalty);
 794           collision_infos.push (info);
 795         }
 796     }
 797
 798   return collision_infos;
 799 }
 800