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--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10
  11 #include "slur-scoring.hh"
  12 #include "libc-extension.hh"
  13 #include "slur-configuration.hh"
  14 #include "beam.hh"
  15 #include "directional-element-interface.hh"
  16 #include "pointer-group-interface.hh"
  17 #include "slur.hh"
  18 #include "note-column.hh"
  19 #include "output-def.hh"
  20 #include "pitch.hh"
  21 #include "spanner.hh"
  22 #include "staff-symbol-referencer.hh"
  23 #include "staff-symbol.hh"
  24 #include "stem.hh"
  25 #include "warn.hh"
  26 #include "paper-column.hh"
  27 #include "accidental-interface.hh"
  28
  29 /*
  30   TODO:
  31
  32   - curve around flag for y coordinate
  33
  34   - short-cut: try a smaller region first.
  35
  36   - handle non-visible stems better.
  37
  38   - try to prune number of scoring criteria
  39
  40   - take encompass-objects more into account when determining
  41   slur shape
  42
  43   - calculate encompass scoring directly after determining slur shape.
  44
  45   - optimize.
  46 */
  47 struct Slur_score_state;
  48
  49 Slur_score_state::Slur_score_state ()
  50 {
  51   musical_dy_ = 0.0;
  52   valid_ = false;
  53   edge_has_beams_ = false;
  54   has_same_beam_ = false;
  55   is_broken_ = false;
  56   dir_ = CENTER;
  57   slur_ = 0;
  58   common_[X_AXIS] = 0;
  59   common_[Y_AXIS] = 0;
  60 }
  61
  62 Slur_score_state::~Slur_score_state ()
  63 {
  64   junk_pointers (configurations_);
  65 }
  66
  67 Real
  68 get_detail (SCM alist, SCM sym)
  69 {
  70   SCM entry = scm_assq (sym, alist);
  71   return robust_scm2double (scm_is_pair (entry)
  72                             ? scm_cdr (entry)
  73                             : SCM_EOL,
  74                             0.0);
  75 }
  76
  77 void
  78 Slur_score_parameters::fill (Grob *me)
  79 {
  80   SCM details = me->get_property ("details");
  81
  82   region_size_
  83     = (int) get_detail (details, ly_symbol2scm ("region-size"));
  84   head_encompass_penalty_
  85     = get_detail (details, ly_symbol2scm ("head-encompass-penalty"));
  86   stem_encompass_penalty_
  87     = get_detail (details, ly_symbol2scm ("stem-encompass-penalty"));
  88   closeness_factor_
  89     = get_detail (details, ly_symbol2scm ("closeness-factor"));
  90   edge_attraction_factor_
  91     = get_detail (details, ly_symbol2scm ("edge-attraction-factor"));
  92   same_slope_penalty_
  93     = get_detail (details, ly_symbol2scm ("same-slope-penalty"));
  94   steeper_slope_factor_
  95     = get_detail (details, ly_symbol2scm ("steeper-slope-factor"));
  96   non_horizontal_penalty_
  97     = get_detail (details, ly_symbol2scm ("non-horizontal-penalty"));
  98   max_slope_
  99     = get_detail (details, ly_symbol2scm ("max-slope"));
 100   max_slope_factor_
 101     = get_detail (details, ly_symbol2scm ("max-slope-factor"));
 102   free_head_distance_
 103     = get_detail (details, ly_symbol2scm ("free-head-distance"));
 104   absolute_closeness_measure_
 105     = get_detail (details, ly_symbol2scm ("absolute-closeness-measure"));
 106   extra_object_collision_penalty_
 107     = get_detail (details, ly_symbol2scm ("extra-object-collision-penalty"));
 108   accidental_collision_
 109     = get_detail (details, ly_symbol2scm ("accidental-collision"));
 110   extra_encompass_free_distance_
 111     = get_detail (details, ly_symbol2scm ("extra-encompass-free-distance"));
 112   head_slur_distance_factor_
 113     = get_detail (details, ly_symbol2scm ("head-slur-distance-factor"));
 114   head_slur_distance_max_ratio_
 115     = get_detail (details, ly_symbol2scm ("head-slur-distance-max-ratio"));
 116   free_slur_distance_
 117     = get_detail (details, ly_symbol2scm ("free-slur-distance"));
 118   edge_slope_exponent_
 119     = get_detail (details, ly_symbol2scm ("edge-slope-exponent"));
 120 }
 121
 122 Real
 123 broken_trend_y (Slur_score_state const &state, Direction hdir)
 124 {
 125   /* A broken slur should maintain the same vertical trend
 126      the unbroken slur would have had.  */
 127   Real by = 0.0;
 128   if (Spanner *mother = dynamic_cast<Spanner *> (state.slur_->original ()))
 129     {
 130       vsize k = broken_spanner_index (state.slur_);
 131       int j = k + hdir;
 132       if (j < 0 || j >= mother->broken_intos_.size ())
 133         return by;
 134
 135       Grob *neighbor = mother->broken_intos_[j];
 136       Spanner *common_mother
 137         = dynamic_cast<Spanner *> (state.common_[Y_AXIS]->original ());
 138       int common_k
 139         = broken_spanner_index (dynamic_cast<Spanner *> (state.common_[Y_AXIS]));
 140       int common_j = common_k + hdir;
 141
 142       if (common_j < 0 || common_j >= common_mother->broken_intos_.size ())
 143         return by;
 144
 145       Grob *common_next_system = common_mother->broken_intos_[common_j];
 146
 147       SCM last_point = scm_car (scm_last_pair (neighbor->get_property ("control-points")));
 148
 149       return scm_to_double (scm_cdr (last_point))
 150         + neighbor->relative_coordinate (common_next_system, Y_AXIS);
 151     }
 152   return by;
 153 }
 154
 155 /*
 156   copy slur dir forwards across line break.
 157 */
 158 void
 159 Slur_score_state::set_next_direction ()
 160 {
 161   if (extremes_[RIGHT].note_column_)
 162     return;
 163
 164   if (Spanner *mother = dynamic_cast<Spanner *> (slur_->original ()))
 165     {
 166       vsize k = broken_spanner_index (slur_);
 167       int j = k + 1;
 168       if (j < 0 || j >= mother->broken_intos_.size ())
 169         return;
 170
 171       Grob *neighbor = mother->broken_intos_[j];
 172       set_grob_direction (neighbor, dir_);
 173     }
 174 }
 175
 176 Encompass_info
 177 Slur_score_state::get_encompass_info (Grob *col) const
 178 {
 179   Grob *stem = unsmob_grob (col->get_object ("stem"));
 180   Encompass_info ei;
 181
 182   if (!stem)
 183     {
 184       programming_error ("no stem for note column");
 185       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 186       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 187                                          Y_AXIS)[dir_];
 188       return ei;
 189     }
 190   Direction stem_dir = get_grob_direction (stem);
 191
 192   if (Grob *head = Note_column::first_head (col))
 193     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 194   else
 195     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 196
 197   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 198   if (!h)
 199     {
 200       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 201       return ei;
 202     }
 203
 204   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 205
 206   if ((stem_dir == dir_)
 207       && !stem->extent (stem, Y_AXIS).is_empty ())
 208     {
 209       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 210       if (Grob *b = Stem::get_beam (stem))
 211         ei.stem_ += stem_dir * 0.5 * Beam::get_thickness (b);
 212
 213       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 214       ei.x_ = x.is_empty ()
 215         ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 216         : x.center ();
 217     }
 218   else
 219     ei.stem_ = ei.head_;
 220
 221   return ei;
 222 }
 223
 224 Drul_array<Bound_info>
 225 Slur_score_state::get_bound_info () const
 226 {
 227   Drul_array<Bound_info> extremes;
 228
 229   Direction d = LEFT;
 230   Direction dir = dir_;
 231
 232   do
 233     {
 234       extremes[d].bound_ = slur_->get_bound (d);
 235       if (Note_column::has_interface (extremes[d].bound_))
 236         {
 237           extremes[d].note_column_ = extremes[d].bound_;
 238           extremes[d].stem_ = Note_column::get_stem (extremes[d].note_column_);
 239           if (extremes[d].stem_)
 240             {
 241               extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 242
 243               for (int a = X_AXIS; a < NO_AXES; a++)
 244                 {
 245                   Axis ax = Axis (a);
 246                   Interval s = extremes[d].stem_->extent (common_[ax], ax);
 247                   if (s.is_empty ())
 248                     {
 249                       /*
 250                         do not issue warning. This happens for rests and
 251                         whole notes.
 252                       */
 253                       s = Interval (0, 0)
 254                         + extremes[d].stem_->relative_coordinate (common_[ax], ax);
 255                     }
 256                   extremes[d].stem_extent_[ax] = s;
 257                 }
 258
 259               extremes[d].slur_head_
 260                 = Stem::extremal_heads (extremes[d].stem_)[dir];
 261               if (!extremes[d].slur_head_
 262                   && Note_column::has_rests (extremes[d].bound_))
 263                 extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 264               extremes[d].staff_ = Staff_symbol_referencer
 265                 ::get_staff_symbol (extremes[d].stem_);
 266               extremes[d].staff_space_ = Staff_symbol_referencer
 267                 ::staff_space (extremes[d].stem_);
 268             }
 269
 270           if (extremes[d].slur_head_)
 271             extremes[d].slur_head_x_extent_
 272               = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 273
 274         }
 275     }
 276   while (flip (&d) != LEFT);
 277
 278   return extremes;
 279 }
 280
 281 void
 282 Slur_score_state::fill (Grob *me)
 283 {
 284   slur_ = dynamic_cast<Spanner *> (me);
 285   columns_
 286     = internal_extract_grob_array (me, ly_symbol2scm ("note-columns"));
 287
 288   if (columns_.empty ())
 289     {
 290       me->suicide ();
 291       return;
 292     }
 293
 294   staff_space_ = Staff_symbol_referencer::staff_space (me);
 295   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 296   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
 297
 298   dir_ = get_grob_direction (me);
 299   parameters_.fill (me);
 300
 301   extract_grob_set (me, "note-columns", columns);
 302   extract_grob_set (me, "encompass-objects", extra_objects);
 303
 304   Spanner *sp = dynamic_cast<Spanner *> (me);
 305
 306   for (int i = X_AXIS; i < NO_AXES; i++)
 307     {
 308       Axis a = (Axis)i;
 309       common_[a] = common_refpoint_of_array (columns, me, a);
 310       common_[a] = common_refpoint_of_array (extra_objects, common_[a], a);
 311
 312       Direction d = LEFT;
 313       do
 314         {
 315           /*
 316             If bound is not in note-columns, we don't want to know about
 317             its Y-position
 318           */
 319           if (a != Y_AXIS)
 320             common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 321         }
 322       while (flip (&d) != LEFT);
 323     }
 324
 325   extremes_ = get_bound_info ();
 326   is_broken_ = (!extremes_[LEFT].note_column_
 327                 || !extremes_[RIGHT].note_column_);
 328
 329   has_same_beam_
 330     = (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 331        && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 332
 333   base_attachments_ = get_base_attachments ();
 334
 335   Drul_array<Real> end_ys
 336     = get_y_attachment_range ();
 337
 338   configurations_ = enumerate_attachments (end_ys);
 339   for (vsize i = 0; i < columns_.size (); i++)
 340     encompass_infos_.push_back (get_encompass_info (columns_[i]));
 341
 342   extra_encompass_infos_ = get_extra_encompass_infos ();
 343   valid_ = true;
 344
 345   musical_dy_ = 0.0;
 346   Direction d = LEFT;
 347   do
 348     {
 349       if (!is_broken_
 350           && extremes_[d].slur_head_)
 351         musical_dy_ += d
 352           * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 353     }
 354   while (flip (&d) != LEFT);
 355
 356   edge_has_beams_
 357     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 358     || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 359
 360   set_next_direction ();
 361
 362   if (is_broken_)
 363     musical_dy_ = 0.0;
 364 }
 365
 366
 367 MAKE_SCHEME_CALLBACK(Slur, calc_control_points, 1)
 368 SCM
 369 Slur::calc_control_points (SCM smob)
 370 {
 371   Spanner *me = unsmob_spanner (smob);
 372
 373   Slur_score_state state;
 374   state.fill (me);
 375
 376   if (!state.valid_)
 377     return SCM_EOL;
 378
 379   state.generate_curves ();
 380
 381   SCM end_ys = me->get_property ("positions");
 382   Bezier best;
 383
 384   if (is_number_pair (end_ys))
 385     best = state.configurations_[state.get_closest_index (end_ys)]->curve_;
 386   else
 387     best = state.get_best_curve ();
 388
 389   SCM controls = SCM_EOL;
 390   for (int i = 4; i--;)
 391     {
 392       Offset o = best.control_[i]
 393         - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 394                   me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 395       controls = scm_cons (ly_offset2scm (o), controls);
 396     }
 397
 398   return controls;
 399 }
 400
 401 Bezier
 402 Slur_score_state::get_best_curve ()
 403 {
 404   int opt_idx = -1;
 405   Real opt = 1e6;
 406
 407 #if DEBUG_SLUR_SCORING
 408   SCM inspect_quants = slur_->get_property ("inspect-quants");
 409   if (to_boolean (slur_->layout ()
 410                   ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")))
 411       && scm_is_pair (inspect_quants))
 412     {
 413       opt_idx = get_closest_index (inspect_quants);
 414       configurations_[opt_idx]->score (*this);
 415       opt = configurations_[opt_idx]->score_;
 416     }
 417   else
 418 #endif
 419     {
 420       for (vsize i = 0; i < configurations_.size (); i++)
 421         configurations_[i]->score (*this);
 422       for (vsize i = 0; i < configurations_.size (); i++)
 423         {
 424           if (configurations_[i]->score_ < opt)
 425             {
 426               opt = configurations_[i]->score_;
 427               opt_idx = i;
 428             }
 429         }
 430     }
 431
 432 #if DEBUG_SLUR_SCORING
 433   if (opt_idx >= 0)
 434     {
 435       configurations_[opt_idx]->score_card_ += to_string ("=%.2f", opt);
 436       configurations_[opt_idx]->score_card_ += to_string ("i%d", opt_idx);
 437     }
 438   else
 439     {
 440       programming_error ("No optimal slur found. Guessing 0.");
 441       opt_idx = 0;
 442     }
 443
 444   // debug quanting
 445   slur_->set_property ("quant-score",
 446                        scm_makfrom0str (configurations_[opt_idx]->score_card_.c_str ()));
 447
 448 #endif
 449
 450   return configurations_[opt_idx]->curve_;
 451 }
 452
 453 int
 454 Slur_score_state::get_closest_index (SCM inspect_quants) const
 455 {
 456   Drul_array<Real> ins = ly_scm2interval (inspect_quants);
 457
 458   int opt_idx = -1;
 459   Real mindist = 1e6;
 460   for (vsize i = 0; i < configurations_.size (); i++)
 461     {
 462       Real d = fabs (configurations_[i]->attachment_[LEFT][Y_AXIS] - ins[LEFT])
 463         + fabs (configurations_[i]->attachment_[RIGHT][Y_AXIS] - ins[RIGHT]);
 464       if (d < mindist)
 465         {
 466           opt_idx = i;
 467           mindist = d;
 468         }
 469     }
 470   if (mindist > 1e5)
 471     programming_error ("can't not find quant");
 472   return opt_idx;
 473 }
 474
 475 /*
 476   TODO: should analyse encompasses to determine sensible region, and
 477   should limit slopes available.
 478 */
 479
 480 Drul_array<Real>
 481 Slur_score_state::get_y_attachment_range () const
 482 {
 483   Drul_array<Real> end_ys;
 484   Direction d = LEFT;
 485   do
 486     {
 487       if (extremes_[d].note_column_)
 488         {
 489           end_ys[d] = dir_
 490             * max (max (dir_ * (base_attachments_[d][Y_AXIS]
 491                                           + parameters_.region_size_ * dir_),
 492                         dir_ * (dir_ + extremes_[d].note_column_->extent (common_[Y_AXIS], Y_AXIS)[dir_])),
 493                    dir_ * base_attachments_[-d][Y_AXIS]);
 494         }
 495       else
 496         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 497     }
 498   while (flip (&d) != LEFT);
 499
 500   return end_ys;
 501 }
 502
 503 bool
 504 spanner_less (Spanner *s1, Spanner *s2)
 505 {
 506   Slice b1, b2;
 507   Direction d = LEFT;
 508   do
 509     {
 510       b1[d] = s1->get_bound (d)->get_column ()->get_rank ();
 511       b2[d] = s2->get_bound (d)->get_column ()->get_rank ();
 512     }
 513   while (flip (&d) != LEFT);
 514
 515   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 516     && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 517 }
 518
 519 Drul_array<Offset>
 520 Slur_score_state::get_base_attachments () const
 521 {
 522   Drul_array<Offset> base_attachment;
 523   Direction d = LEFT;
 524   do
 525     {
 526       Grob *stem = extremes_[d].stem_;
 527       Grob *head = extremes_[d].slur_head_;
 528
 529       Real x = 0.0;
 530       Real y = 0.0;
 531       if (extremes_[d].note_column_)
 532         {
 533
 534           /*
 535             fixme: X coord should also be set in this case.
 536           */
 537           if (stem
 538               && !Stem::is_invisible (stem)
 539               && extremes_[d].stem_dir_ == dir_
 540               && Stem::get_beaming (stem, -d)
 541               && Stem::get_beam (stem)
 542               && (!spanner_less (slur_, Stem::get_beam (stem))
 543                   || has_same_beam_))
 544             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 545           else if (head)
 546             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 547           y += dir_ * 0.5 * staff_space_;
 548
 549           y = move_away_from_staffline (y, head);
 550
 551           Grob *fh = Note_column::first_head (extremes_[d].note_column_);
 552           x
 553             = (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 554                : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 555             .linear_combination (CENTER);
 556         }
 557       base_attachment[d] = Offset (x, y);
 558     }
 559   while (flip (&d) != LEFT);
 560
 561   do
 562     {
 563       if (!extremes_[d].note_column_)
 564         {
 565           Real x, y;
 566           if (d == RIGHT)
 567             x = extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS)[d];
 568           else
 569             x = slur_->get_broken_left_end_align ();
 570           Grob *col = (d == LEFT) ? columns_[0] : columns_.back ();
 571
 572           if (extremes_[-d].bound_ != col)
 573             {
 574               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 575               y += dir_ * 0.5 * staff_space_;
 576
 577               if (get_grob_direction (col) == dir_
 578                   && Note_column::get_stem (col)
 579                   && !Stem::is_invisible (Note_column::get_stem (col)))
 580                 y -= dir_ * 1.5 * staff_space_;
 581             }
 582           else
 583             y = base_attachment[-d][Y_AXIS];
 584
 585           y = move_away_from_staffline (y, col);
 586
 587           base_attachment[d] = Offset (x, y);
 588         }
 589     }
 590   while (flip (&d) != LEFT);
 591
 592   do
 593     {
 594       for (int a = X_AXIS; a < NO_AXES; a++)
 595         {
 596           Real &b = base_attachment[d][Axis (a)];
 597
 598           if (isinf (b) || isnan (b))
 599             {
 600               programming_error ("slur attachment is inf/nan");
 601               b = 0.0;
 602             }
 603         }
 604     }
 605   while (flip (&d) != LEFT);
 606
 607   return base_attachment;
 608 }
 609
 610 Real
 611 Slur_score_state::move_away_from_staffline (Real y,
 612                                             Grob *on_staff) const
 613 {
 614   if (!on_staff)
 615     return y;
 616
 617   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
 618   if (!staff_symbol)
 619     return y;
 620
 621   Real pos
 622     = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
 623                                               Y_AXIS))
 624     * 2.0 / staff_space_;
 625
 626   if (fabs (pos - my_round (pos)) < 0.2
 627       && Staff_symbol_referencer::on_line (on_staff, (int) rint (pos))
 628       && Staff_symbol_referencer::line_count (on_staff) - 1 >= rint (pos))
 629     y += 1.5 * staff_space_ * dir_ / 10;
 630
 631   return y;
 632 }
 633
 634 vector<Offset>
 635 Slur_score_state::generate_avoid_offsets () const
 636 {
 637   vector<Offset> avoid;
 638   vector<Grob*> encompasses = columns_;
 639
 640   for (vsize i = 0; i < encompasses.size (); i++)
 641     {
 642       if (extremes_[LEFT].note_column_ == encompasses[i]
 643           || extremes_[RIGHT].note_column_ == encompasses[i])
 644         continue;
 645
 646       Encompass_info inf (get_encompass_info (encompasses[i]));
 647       Real y = dir_ * (max (dir_ * inf.head_, dir_ * inf.stem_));
 648
 649       avoid.push_back (Offset (inf.x_, y + dir_ * parameters_.free_head_distance_));
 650     }
 651
 652   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 653   for (vsize i = 0; i < extra_encompasses.size (); i++)
 654     {
 655       if (Slur::has_interface (extra_encompasses[i]))
 656         {
 657           Grob *small_slur = extra_encompasses[i];
 658           Bezier b = Slur::get_curve (small_slur);
 659
 660           Offset z = b.curve_point (0.5);
 661           z += Offset (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 662                        small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 663
 664           z[Y_AXIS] += dir_ * parameters_.free_slur_distance_;
 665           avoid.push_back (z);
 666         }
 667       else if (extra_encompasses[i]->get_property ("avoid-slur") == ly_symbol2scm ("inside"))
 668         {
 669           Grob *g = extra_encompasses [i];
 670           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 671           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 672
 673           if (!xe.is_empty ()
 674               && !ye.is_empty ())
 675             avoid.push_back (Offset (xe.center(), ye[dir_]));
 676         }
 677     }
 678   return avoid;
 679 }
 680
 681 void
 682 Slur_score_state::generate_curves () const
 683 {
 684   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 685   Real h_inf = staff_space_ * scm_to_double (slur_->get_property ("height-limit"));
 686
 687   vector<Offset> avoid = generate_avoid_offsets ();
 688   for (vsize i = 0; i < configurations_.size (); i++)
 689     configurations_[i]->generate_curve (*this, r_0, h_inf, avoid);
 690 }
 691
 692 vector<Slur_configuration*>
 693 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 694 {
 695   vector<Slur_configuration*> scores;
 696
 697   Drul_array<Offset> os;
 698   os[LEFT] = base_attachments_[LEFT];
 699   Real minimum_length = staff_space_
 700     * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 701
 702   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 703     {
 704       os[RIGHT] = base_attachments_[RIGHT];
 705       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 706         {
 707           Slur_configuration s;
 708           Direction d = LEFT;
 709           Drul_array<bool> attach_to_stem (false, false);
 710           do
 711             {
 712               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 713               if (extremes_[d].stem_
 714                   && !Stem::is_invisible (extremes_[d].stem_)
 715                   && extremes_[d].stem_dir_ == dir_)
 716                 {
 717                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 718                   stem_y.widen (0.25 * staff_space_);
 719                   if (stem_y.contains (os[d][Y_AXIS]))
 720                     {
 721                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 722                         - d * 0.3;
 723                       attach_to_stem[d] = true;
 724                     }
 725                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 726                            < dir_ * os[d][Y_AXIS]
 727                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ())
 728
 729                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 730                 }
 731             }
 732           while (flip (&d) != LEFT);
 733
 734           Offset dz;
 735           dz = os[RIGHT] - os[LEFT];
 736           if (dz[X_AXIS] < minimum_length
 737               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_)
 738             {
 739               do
 740                 {
 741                   if (extremes_[d].slur_head_
 742                       && !extremes_[d].slur_head_x_extent_.is_empty ())
 743                     {
 744                       os[d][X_AXIS] = extremes_[d].slur_head_x_extent_.center ();
 745                       attach_to_stem[d] = false;
 746                     }
 747                 }
 748               while (flip (&d) != LEFT);
 749             }
 750
 751           dz = os[RIGHT] - os[LEFT];
 752           do
 753             {
 754               if (extremes_[d].slur_head_
 755                   && !attach_to_stem[d])
 756                 {
 757                   /* Horizontally move tilted slurs a little.  Move
 758                      more for bigger tilts.
 759
 760                      TODO: parameter */
 761                   os[d][X_AXIS]
 762                     -= dir_ * extremes_[d].slur_head_x_extent_.length ()
 763                     * sin (dz.arg ()) / 3;
 764                 }
 765             }
 766           while (flip (&d) != LEFT);
 767
 768           s.attachment_ = os;
 769           s.index_ = scores.size ();
 770
 771           scores.push_back (new Slur_configuration (s));
 772
 773           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 774         }
 775
 776       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 777     }
 778
 779   assert (scores.size () > 0);
 780   return scores;
 781 }
 782
 783 vector<Extra_collision_info>
 784 Slur_score_state::get_extra_encompass_infos () const
 785 {
 786   extract_grob_set (slur_, "encompass-objects", encompasses);
 787   vector<Extra_collision_info> collision_infos;
 788   for (vsize i = encompasses.size (); i--;)
 789     {
 790       if (Slur::has_interface (encompasses[i]))
 791         {
 792           Spanner *small_slur = dynamic_cast<Spanner *> (encompasses[i]);
 793           Bezier b = Slur::get_curve (small_slur);
 794
 795           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 796                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 797
 798           for (int k = 0; k < 3; k++)
 799             {
 800               Direction hdir = Direction (k / 2 - 1);
 801
 802               /*
 803                 Only take bound into account if small slur starts
 804                 together with big slur.
 805               */
 806               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 807                 continue;
 808
 809               Offset z = b.curve_point (k / 2.0);
 810               z += relative;
 811
 812               Interval yext;
 813               yext.set_full ();
 814               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 815
 816               Interval xext (-1, 1);
 817               xext = xext * (thickness_ * 2) + z[X_AXIS];
 818               Extra_collision_info info (small_slur,
 819                                          k - 1.0,
 820                                          xext,
 821                                          yext,
 822                                          parameters_.extra_object_collision_penalty_);
 823               collision_infos.push_back (info);
 824             }
 825         }
 826       else
 827         {
 828           Grob *g = encompasses [i];
 829           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 830           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 831
 832           Real xp = 0.0;
 833           Real penalty = parameters_.extra_object_collision_penalty_;
 834           if (Accidental_interface::has_interface (g))
 835             {
 836               penalty = parameters_.accidental_collision_;
 837               /* Begin copy accidental.cc */
 838               bool parens = false;
 839               if (to_boolean (g->get_property ("cautionary")))
 840                 {
 841                   SCM cstyle = g->get_property ("cautionary-style");
 842                   parens = ly_is_equal (cstyle, ly_symbol2scm ("parentheses"));
 843                 }
 844
 845               SCM accs = g->get_property ("accidentals");
 846               SCM scm_style = g->get_property ("style");
 847               if (!scm_is_symbol (scm_style)
 848                   && !parens
 849                   && scm_ilength (accs) == 1)
 850                 {
 851                   /* End copy accidental.cc */
 852                   switch (scm_to_int (scm_car (accs)))
 853                     {
 854                     case FLAT:
 855                     case DOUBLE_FLAT:
 856                       xp = LEFT;
 857                       break;
 858                     case SHARP:
 859                       xp = 0.5 * dir_;
 860                       break;
 861                     case NATURAL:
 862                       xp = -dir_;
 863                       break;
 864                     }
 865                 }
 866             }
 867
 868           ye.widen (thickness_ * 0.5);
 869           xe.widen (thickness_ * 1.0);
 870           Extra_collision_info info (g, xp, xe, ye, penalty);
 871           collision_infos.push_back (info);
 872         }
 873     }
 874
 875   return collision_infos;
 876 }
 877
 878 Extra_collision_info::Extra_collision_info (Grob *g, Real idx, Interval x, Interval y, Real p)
 879 {
 880   idx_ = idx;
 881   extents_[X_AXIS] = x;
 882   extents_[Y_AXIS] = y;
 883   penalty_ = p;
 884   grob_ = g;
 885   type_ = g->get_property ("avoid-slur");
 886 }
 887
 888 Extra_collision_info::Extra_collision_info ()
 889 {
 890   idx_ = 0.0;
 891   penalty_ = 0.;
 892   grob_ = 0;
 893   type_ = SCM_EOL;
 894 }