lily/slur-scoring.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5   Jan Nieuwenhuizen <janneke@gnu.org>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "slur-scoring.hh"
  22
  23 #include <queue>
  24
  25 #include "axis-group-interface.hh"
  26 #include "accidental-interface.hh"
  27 #include "beam.hh"
  28 #include "clef.hh"
  29 #include "directional-element-interface.hh"
  30 #include "dots.hh"
  31 #include "libc-extension.hh"
  32 #include "main.hh"
  33 #include "misc.hh"
  34 #include "note-column.hh"
  35 #include "note-head.hh"
  36 #include "output-def.hh"
  37 #include "paper-column.hh"
  38 #include "pitch.hh"
  39 #include "pointer-group-interface.hh"
  40 #include "slur-configuration.hh"
  41 #include "slur.hh"
  42 #include "spanner.hh"
  43 #include "staff-symbol-referencer.hh"
  44 #include "staff-symbol.hh"
  45 #include "stem.hh"
  46 #include "warn.hh"
  47
  48 using std::string;
  49 using std::vector;
  50
  51 /*
  52   TODO:
  53
  54   - curve around flag for y coordinate
  55
  56   - short-cut: try a smaller region first.
  57
  58   - handle non-visible stems better.
  59
  60   - try to prune number of scoring criteria
  61
  62   - take encompass-objects more into account when determining
  63   slur shape
  64
  65   - calculate encompass scoring directly after determining slur shape.
  66
  67   - optimize.
  68 */
  69 struct Slur_score_state;
  70
  71 Slur_score_state::Slur_score_state ()
  72 {
  73   musical_dy_ = 0.0;
  74   valid_ = false;
  75   edge_has_beams_ = false;
  76   has_same_beam_ = false;
  77   is_broken_ = false;
  78   dir_ = CENTER;
  79   slur_ = 0;
  80   common_[X_AXIS] = 0;
  81   common_[Y_AXIS] = 0;
  82 }
  83
  84 Slur_score_state::~Slur_score_state ()
  85 {
  86   junk_pointers (configurations_);
  87 }
  88
  89 /*
  90   If a slur is broken across a line break, the direction
  91   of the post-break slur must be the same as the pre-break
  92   slur.
  93 */
  94 Direction
  95 Slur_score_state::slur_direction () const
  96 {
  97   Grob *left_neighbor = slur_->broken_neighbor (LEFT);
  98
  99   if (left_neighbor && left_neighbor->is_live ())
 100     return get_grob_direction (left_neighbor);
 101
 102   Direction dir = get_grob_direction (slur_);
 103
 104   if (Grob *right_neighbor = slur_->broken_neighbor (RIGHT))
 105     set_grob_direction (right_neighbor, dir);
 106
 107   return dir;
 108 }
 109
 110 Encompass_info
 111 Slur_score_state::get_encompass_info (Grob *col) const
 112 {
 113   Grob *stem = unsmob<Grob> (col->get_object ("stem"));
 114   Encompass_info ei;
 115
 116   if (!stem)
 117     {
 118       programming_error ("no stem for note column");
 119       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 120       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 121                                          Y_AXIS)[dir_];
 122       return ei;
 123     }
 124   Direction stem_dir = get_grob_direction (stem);
 125
 126   if (Grob *head = Note_column::first_head (col))
 127     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 128   else
 129     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 130
 131   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 132   if (!h)
 133     {
 134       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 135       return ei;
 136     }
 137
 138   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 139
 140   if ((stem_dir == dir_)
 141       && !stem->extent (stem, Y_AXIS).is_empty ())
 142     {
 143       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 144       if (Grob *b = Stem::get_beam (stem))
 145         ei.stem_ += stem_dir * 0.5 * Beam::get_beam_thickness (b);
 146
 147       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 148       ei.x_ = x.is_empty ()
 149               ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 150               : x.center ();
 151     }
 152   else
 153     ei.stem_ = ei.head_;
 154
 155   return ei;
 156 }
 157
 158 Drul_array<Bound_info>
 159 Slur_score_state::get_bound_info () const
 160 {
 161   Drul_array<Bound_info> extremes;
 162
 163   Direction dir = dir_;
 164
 165   for (LEFT_and_RIGHT (d))
 166     {
 167       extremes[d].bound_ = slur_->get_bound (d);
 168       if (has_interface<Note_column> (extremes[d].bound_))
 169         {
 170           extremes[d].note_column_ = extremes[d].bound_;
 171           extremes[d].stem_ = Note_column::get_stem (extremes[d].note_column_);
 172           extremes[d].flag_ = Note_column::get_flag (extremes[d].note_column_);
 173
 174           if (extremes[d].stem_)
 175             {
 176               extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 177
 178               for (int a = X_AXIS; a < NO_AXES; a++)
 179                 {
 180                   Axis ax = Axis (a);
 181                   Interval s = extremes[d].stem_->extent (common_[ax], ax);
 182                   if (extremes[d].flag_)
 183                     s.unite (extremes[d].flag_->extent (common_[ax], ax));
 184                   if (s.is_empty ())
 185                     {
 186                       /*
 187                         do not issue warning. This happens for rests and
 188                         whole notes.
 189                       */
 190                       s = Interval (0, 0)
 191                           + extremes[d].stem_->relative_coordinate (common_[ax], ax);
 192                     }
 193                   extremes[d].stem_extent_[ax] = s;
 194                 }
 195
 196               extremes[d].slur_head_
 197                 = Stem::extremal_heads (extremes[d].stem_)[dir];
 198               if (!extremes[d].slur_head_
 199                   && Note_column::has_rests (extremes[d].bound_))
 200                 extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 201               extremes[d].staff_ = Staff_symbol_referencer
 202                                    ::get_staff_symbol (extremes[d].stem_);
 203               extremes[d].staff_space_ = Staff_symbol_referencer
 204                                          ::staff_space (extremes[d].stem_);
 205             }
 206
 207         }
 208       else if (has_interface<Note_head> (extremes[d].bound_))
 209         {
 210           extremes[d].slur_head_ = extremes[d].bound_;
 211         }
 212       if (extremes[d].slur_head_)
 213         extremes[d].slur_head_x_extent_
 214           = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 215     }
 216
 217   return extremes;
 218 }
 219
 220 void
 221 Slur_score_state::fill (Grob *me)
 222 {
 223   slur_ = dynamic_cast<Spanner *> (me);
 224   columns_
 225     = internal_extract_grob_array (me, ly_symbol2scm ("note-columns"));
 226
 227   if (columns_.empty ())
 228     {
 229       me->suicide ();
 230       return;
 231     }
 232
 233   Slur::replace_breakable_encompass_objects (me);
 234   staff_space_ = Staff_symbol_referencer::staff_space (me);
 235   line_thickness_ = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 236   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * line_thickness_;
 237
 238   dir_ = slur_direction ();
 239   parameters_.fill (me);
 240
 241   extract_grob_set (me, "note-columns", columns);
 242   extract_grob_set (me, "encompass-objects", extra_objects);
 243
 244   Spanner *sp = dynamic_cast<Spanner *> (me);
 245
 246   for (int i = X_AXIS; i < NO_AXES; i++)
 247     {
 248       Axis a = (Axis)i;
 249       common_[a] = common_refpoint_of_array (columns, me, a);
 250       common_[a] = common_refpoint_of_array (extra_objects, common_[a], a);
 251
 252       for (LEFT_and_RIGHT (d))
 253         {
 254           /*
 255             If bound is not in note-columns, we don't want to know about
 256             its Y-position
 257           */
 258           if (a != Y_AXIS)
 259             common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 260         }
 261     }
 262
 263   extremes_ = get_bound_info ();
 264   is_broken_ = (!(extremes_[LEFT].note_column_ || extremes_[LEFT].slur_head_)
 265                 || !(extremes_[RIGHT].note_column_ || extremes_[RIGHT].slur_head_));
 266
 267   has_same_beam_
 268     = (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 269        && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 270
 271   base_attachments_ = get_base_attachments ();
 272
 273   Drul_array<Real> end_ys
 274     = get_y_attachment_range ();
 275
 276   extra_encompass_infos_ = get_extra_encompass_infos ();
 277
 278   Interval additional_ys (0.0, 0.0);
 279
 280   for (vsize i = 0; i < extra_encompass_infos_.size (); i++)
 281     {
 282       if (extra_encompass_infos_[i].extents_[X_AXIS].is_empty ())
 283         continue;
 284
 285       Real y_place = linear_interpolate (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 286                                          base_attachments_[RIGHT][X_AXIS],
 287                                          base_attachments_[LEFT][X_AXIS],
 288                                          end_ys[RIGHT],
 289                                          end_ys[LEFT]);
 290       Real encompass_place = extra_encompass_infos_[i].extents_[Y_AXIS][dir_];
 291       if (scm_is_eq (extra_encompass_infos_[i].type_,
 292                      ly_symbol2scm ("inside"))
 293           && minmax (dir_, encompass_place, y_place) == encompass_place
 294           && (!extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("key-signature-interface"))
 295               && !has_interface<Clef> (extra_encompass_infos_[i].grob_)
 296               && !extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("time-signature-interface"))))
 297         {
 298           for (LEFT_and_RIGHT (d))
 299             additional_ys[d] = minmax (dir_,
 300                                        additional_ys[d],
 301                                        (dir_
 302                                         * (parameters_.encompass_object_range_overshoot_
 303                                            + (y_place - encompass_place)
 304                                            * (normalize (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 305                                                          base_attachments_[RIGHT][X_AXIS],
 306                                                          base_attachments_[LEFT][X_AXIS])
 307                                               + (dir_ == LEFT ? 0 : -1)))));
 308         }
 309     }
 310
 311   for (LEFT_and_RIGHT (d))
 312     end_ys[d] += additional_ys[d];
 313
 314   configurations_ = enumerate_attachments (end_ys);
 315   for (vsize i = 0; i < columns_.size (); i++)
 316     encompass_infos_.push_back (get_encompass_info (columns_[i]));
 317
 318   valid_ = true;
 319
 320   musical_dy_ = 0.0;
 321   for (LEFT_and_RIGHT (d))
 322     {
 323       if (!is_broken_
 324           && extremes_[d].slur_head_)
 325         musical_dy_ += d
 326                        * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 327     }
 328
 329   edge_has_beams_
 330     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 331       || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 332
 333   if (is_broken_)
 334     musical_dy_ = 0.0;
 335 }
 336
 337 MAKE_SCHEME_CALLBACK (Slur, calc_control_points, 1)
 338 SCM
 339 Slur::calc_control_points (SCM smob)
 340 {
 341   Spanner *me = unsmob<Spanner> (smob);
 342
 343   Slur_score_state state;
 344   state.fill (me);
 345
 346   if (!state.valid_)
 347     return SCM_EOL;
 348
 349   state.generate_curves ();
 350
 351   SCM end_ys = me->get_property ("positions");
 352   SCM inspect_quants = me->get_property ("inspect-quants");
 353   bool debug_slurs = to_boolean (me->layout ()
 354                                  ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")));
 355
 356   if (is_number_pair (inspect_quants))
 357     {
 358       debug_slurs = true;
 359       end_ys = inspect_quants;
 360     }
 361
 362   Slur_configuration *best = NULL;
 363   if (is_number_pair (end_ys))
 364     best = state.get_forced_configuration (ly_scm2interval (end_ys));
 365   else
 366     best = state.get_best_curve ();
 367
 368 #if DEBUG_SLUR_SCORING
 369   if (debug_slurs)
 370     {
 371       string total = best->card ();
 372       total += to_string (" TOTAL=%.2f idx=%d", best->score (), best->index_);
 373       me->set_property ("annotation", ly_string2scm (total));
 374     }
 375 #endif
 376
 377   SCM controls = SCM_EOL;
 378   for (int i = 4; i--;)
 379     {
 380       Offset o = best->curve_.control_[i]
 381                  - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 382                            me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 383       controls = scm_cons (ly_offset2scm (o), controls);
 384     }
 385
 386   return controls;
 387 }
 388
 389 Slur_configuration *
 390 Slur_score_state::get_forced_configuration (Interval ys) const
 391 {
 392   Slur_configuration *best = NULL;
 393   Real mindist = 1e6;
 394   for (vsize i = 0; i < configurations_.size (); i++)
 395     {
 396       Real d = fabs (configurations_[i]->attachment_[LEFT][Y_AXIS] - ys[LEFT])
 397                + fabs (configurations_[i]->attachment_[RIGHT][Y_AXIS] - ys[RIGHT]);
 398       if (d < mindist)
 399         {
 400           best = configurations_[i];
 401           mindist = d;
 402         }
 403     }
 404
 405   while (!best->done ())
 406     best->run_next_scorer (*this);
 407
 408   if (mindist > 1e5)
 409     programming_error ("cannot find quant");
 410
 411   return best;
 412 }
 413
 414 Slur_configuration *
 415 Slur_score_state::get_best_curve () const
 416 {
 417   std::priority_queue < Slur_configuration *, std::vector<Slur_configuration *>,
 418       Slur_configuration_less > queue;
 419   for (vsize i = 0; i < configurations_.size (); i++)
 420     queue.push (configurations_[i]);
 421
 422   Slur_configuration *best = NULL;
 423   while (true)
 424     {
 425       best = queue.top ();
 426       if (best->done ())
 427         break;
 428
 429       queue.pop ();
 430       best->run_next_scorer (*this);
 431       queue.push (best);
 432     }
 433
 434   return best;
 435 }
 436
 437 Interval
 438 Slur_score_state::breakable_bound_extent (Direction d) const
 439 {
 440   Grob *col = slur_->get_bound (d)->get_column ();
 441   Interval ret;
 442   ret.set_empty ();
 443
 444   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 445
 446   for (vsize i = 0; i < extra_encompasses.size (); i++)
 447     {
 448       Item *item = dynamic_cast<Item *> (extra_encompasses[i]);
 449       if (item && col == item->get_column ())
 450         ret.unite (robust_relative_extent (item, common_[X_AXIS], X_AXIS));
 451     }
 452
 453   return ret;
 454 }
 455
 456 /*
 457   TODO: should analyse encompasses to determine sensible region, and
 458   should limit slopes available.
 459 */
 460
 461 Drul_array<Real>
 462 Slur_score_state::get_y_attachment_range () const
 463 {
 464   Drul_array<Real> end_ys;
 465   for (LEFT_and_RIGHT (d))
 466     {
 467       if (extremes_[d].note_column_)
 468         {
 469           Interval nc_extent = extremes_[d].note_column_
 470                                ->extent (common_[Y_AXIS], Y_AXIS);
 471           if (nc_extent.is_empty ())
 472             slur_->warning ("slur trying to encompass an empty note column.");
 473           else
 474             end_ys[d] = dir_
 475                         * max (max (dir_ * (base_attachments_[d][Y_AXIS]
 476                                             + parameters_.region_size_ * dir_),
 477                                     dir_ * (dir_ + nc_extent[dir_])),
 478                                dir_ * base_attachments_[-d][Y_AXIS]);
 479         }
 480       else if (extremes_[d].slur_head_)
 481         {
 482           // allow only minimal movement
 483           end_ys[d] = base_attachments_[d][Y_AXIS] + 0.3 * dir_;
 484         }
 485       else
 486         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 487     }
 488
 489   return end_ys;
 490 }
 491
 492 bool
 493 spanner_less (Spanner *s1, Spanner *s2)
 494 {
 495   Slice b1, b2;
 496   for (LEFT_and_RIGHT (d))
 497     {
 498       b1[d] = s1->get_bound (d)->get_column ()->get_rank ();
 499       b2[d] = s2->get_bound (d)->get_column ()->get_rank ();
 500     }
 501
 502   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 503          && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 504 }
 505
 506 Drul_array<Offset>
 507 Slur_score_state::get_base_attachments () const
 508 {
 509   Drul_array<Offset> base_attachment;
 510   for (LEFT_and_RIGHT (d))
 511     {
 512       Grob *stem = extremes_[d].stem_;
 513       Grob *head = extremes_[d].slur_head_;
 514
 515       Real x = 0.0;
 516       Real y = 0.0;
 517       if (extremes_[d].note_column_)
 518         {
 519
 520           /*
 521             fixme: X coord should also be set in this case.
 522           */
 523           if (stem
 524               && !Stem::is_invisible (stem)
 525               && extremes_[d].stem_dir_ == dir_
 526               && Stem::get_beaming (stem, -d)
 527               && Stem::get_beam (stem)
 528               && (!spanner_less (slur_, Stem::get_beam (stem))
 529                   || has_same_beam_))
 530             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 531           else if (head)
 532             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 533           y += dir_ * 0.5 * staff_space_;
 534
 535           y = move_away_from_staffline (y, head);
 536
 537           Grob *fh = Note_column::first_head (extremes_[d].note_column_);
 538           x
 539             = (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 540                : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 541               .linear_combination (CENTER);
 542         }
 543       else if (head)
 544         {
 545           y = head->extent (common_[Y_AXIS], Y_AXIS)
 546             .linear_combination (0.5*dir_);
 547
 548           // Don't "move_away_from_staffline" because that makes it
 549           // harder to recognize the specific attachment point
 550           x = head->extent (common_[X_AXIS], X_AXIS)[-d];
 551         }
 552
 553       base_attachment[d] = Offset (x, y);
 554     }
 555
 556   for (LEFT_and_RIGHT (d))
 557     {
 558       if (!extremes_[d].note_column_ && !extremes_[d].slur_head_)
 559         {
 560           Real x = 0;
 561           Real y = 0;
 562
 563           Interval ext = breakable_bound_extent (d);
 564           if (ext.is_empty ())
 565             ext = Axis_group_interface::
 566                   generic_bound_extent (extremes_[d].bound_,
 567                                         common_[X_AXIS], X_AXIS);
 568           x = ext[-d];
 569
 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
 591   for (LEFT_and_RIGHT (d))
 592     {
 593       for (int a = X_AXIS; a < NO_AXES; a++)
 594         {
 595           Real &b = base_attachment[d][Axis (a)];
 596
 597           if (isinf (b) || isnan (b))
 598             {
 599               programming_error ("slur attachment is inf/nan");
 600               b = 0.0;
 601             }
 602         }
 603     }
 604
 605   return base_attachment;
 606 }
 607
 608 Real
 609 Slur_score_state::move_away_from_staffline (Real y,
 610                                             Grob *on_staff) const
 611 {
 612   if (!on_staff)
 613     return y;
 614
 615   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
 616   if (!staff_symbol)
 617     return y;
 618
 619   Real pos
 620     = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
 621                                               Y_AXIS))
 622       * 2.0 / staff_space_;
 623
 624   if (fabs (pos - my_round (pos)) < 0.2
 625       && Staff_symbol_referencer::on_staff_line (on_staff, (int) rint (pos)))
 626     y += 1.5 * staff_space_ * dir_ / 10;
 627
 628   return y;
 629 }
 630
 631 vector<Offset>
 632 Slur_score_state::generate_avoid_offsets () const
 633 {
 634   vector<Offset> avoid;
 635   vector<Grob *> encompasses = columns_;
 636
 637   for (vsize i = 0; i < encompasses.size (); i++)
 638     {
 639       if (extremes_[LEFT].note_column_ == encompasses[i]
 640           || extremes_[RIGHT].note_column_ == encompasses[i])
 641         continue;
 642
 643       Encompass_info inf (get_encompass_info (encompasses[i]));
 644       Real y = dir_ * (max (dir_ * inf.head_, dir_ * inf.stem_));
 645
 646       avoid.push_back (Offset (inf.x_, y + dir_ * parameters_.free_head_distance_));
 647     }
 648
 649   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 650   for (vsize i = 0; i < extra_encompasses.size (); i++)
 651     {
 652       if (has_interface<Slur> (extra_encompasses[i]))
 653         {
 654           Grob *small_slur = extra_encompasses[i];
 655           Bezier b = Slur::get_curve (small_slur);
 656
 657           Offset z = b.curve_point (0.5);
 658           z += Offset (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 659                        small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 660
 661           z[Y_AXIS] += dir_ * parameters_.free_slur_distance_;
 662           avoid.push_back (z);
 663         }
 664       else if (scm_is_eq (extra_encompasses[i]->get_property ("avoid-slur"),
 665                           ly_symbol2scm ("inside")))
 666         {
 667           Grob *g = extra_encompasses [i];
 668           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 669           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 670
 671           if (!xe.is_empty ()
 672               && !ye.is_empty ())
 673             avoid.push_back (Offset (xe.center (), ye[dir_]));
 674         }
 675     }
 676   return avoid;
 677 }
 678
 679 void
 680 Slur_score_state::generate_curves () const
 681 {
 682   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 683   Real h_inf = staff_space_ * scm_to_double (slur_->get_property ("height-limit"));
 684
 685   vector<Offset> avoid = generate_avoid_offsets ();
 686   for (vsize i = 0; i < configurations_.size (); i++)
 687     configurations_[i]->generate_curve (*this, r_0, h_inf, avoid);
 688 }
 689
 690 vector<Slur_configuration *>
 691 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 692 {
 693   vector<Slur_configuration *> scores;
 694
 695   Drul_array<Offset> os;
 696   os[LEFT] = base_attachments_[LEFT];
 697   Real minimum_length = staff_space_
 698                         * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 699
 700   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 701     {
 702       os[RIGHT] = base_attachments_[RIGHT];
 703       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 704         {
 705
 706           Drul_array<bool> attach_to_stem (false, false);
 707           for (LEFT_and_RIGHT (d))
 708             {
 709               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 710               if (extremes_[d].stem_
 711                   && !Stem::is_invisible (extremes_[d].stem_)
 712                   && extremes_[d].stem_dir_ == dir_)
 713                 {
 714                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 715                   stem_y.widen (0.25 * staff_space_);
 716                   if (stem_y.contains (os[d][Y_AXIS]))
 717                     {
 718                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 719                                       - d * 0.3;
 720                       attach_to_stem[d] = true;
 721                     }
 722                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 723                            < dir_ * os[d][Y_AXIS]
 724                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ())
 725
 726                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 727                 }
 728             }
 729
 730           Offset dz;
 731           dz = os[RIGHT] - os[LEFT];
 732           if (dz[X_AXIS] < minimum_length
 733               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_)
 734             {
 735               for (LEFT_and_RIGHT (d))
 736                 {
 737                   if (extremes_[d].slur_head_
 738                       && !extremes_[d].slur_head_x_extent_.is_empty ())
 739                     {
 740                       os[d][X_AXIS] = extremes_[d].slur_head_x_extent_.center ();
 741                       attach_to_stem[d] = false;
 742                     }
 743                 }
 744             }
 745
 746           dz = os[RIGHT] - os[LEFT];
 747           for (LEFT_and_RIGHT (d))
 748             {
 749               if (extremes_[d].slur_head_
 750                   && !attach_to_stem[d])
 751                 {
 752                   /* Horizontally move tilted slurs a little.  Move
 753                      more for bigger tilts.
 754
 755                      TODO: parameter */
 756                   os[d][X_AXIS]
 757                   -= dir_ * extremes_[d].slur_head_x_extent_.length ()
 758                      * sin (dz.arg ()) / 3;
 759                 }
 760             }
 761
 762           scores.push_back (Slur_configuration::new_config (os, scores.size ()));
 763
 764           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 765         }
 766
 767       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 768     }
 769
 770   assert (scores.size () > 0);
 771   return scores;
 772 }
 773
 774 vector<Extra_collision_info>
 775 Slur_score_state::get_extra_encompass_infos () const
 776 {
 777   extract_grob_set (slur_, "encompass-objects", encompasses);
 778   vector<Extra_collision_info> collision_infos;
 779   for (vsize i = encompasses.size (); i--;)
 780     {
 781       if (has_interface<Slur> (encompasses[i]))
 782         {
 783           Spanner *small_slur = dynamic_cast<Spanner *> (encompasses[i]);
 784           Bezier b = Slur::get_curve (small_slur);
 785
 786           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 787                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 788
 789           for (int k = 0; k < 3; k++)
 790             {
 791               Direction hdir = Direction (k - 1);
 792
 793               /*
 794                 Only take bound into account if small slur starts
 795                 together with big slur.
 796               */
 797               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 798                 continue;
 799
 800               Offset z = b.curve_point (k / 2.0);
 801               z += relative;
 802
 803               Interval yext;
 804               yext.set_full ();
 805               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 806
 807               Interval xext (-1, 1);
 808               xext = xext * (thickness_ * 2) + z[X_AXIS];
 809               Extra_collision_info info (small_slur,
 810                                          hdir,
 811                                          xext,
 812                                          yext,
 813                                          parameters_.extra_object_collision_penalty_);
 814               collision_infos.push_back (info);
 815             }
 816         }
 817       else
 818         {
 819           Grob *g = encompasses [i];
 820           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 821           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 822           if (has_interface<Dots> (g))
 823             ye.widen (0.2);
 824
 825           Real xp = 0.0;
 826           Real penalty = parameters_.extra_object_collision_penalty_;
 827           if (has_interface<Accidental_interface> (g))
 828             {
 829               penalty = parameters_.accidental_collision_;
 830
 831               Rational alt = ly_scm2rational (g->get_property ("alteration"));
 832               SCM scm_style = g->get_property ("style");
 833               if (!scm_is_symbol (scm_style)
 834                   && !to_boolean (g->get_property ("parenthesized"))
 835                   && !to_boolean (g->get_property ("restore-first")))
 836                 {
 837                   /* End copy accidental.cc */
 838                   if (alt == FLAT_ALTERATION
 839                       || alt == DOUBLE_FLAT_ALTERATION)
 840                     xp = LEFT;
 841                   else if (alt == SHARP_ALTERATION)
 842                     xp = 0.5 * dir_;
 843                   else if (alt == NATURAL_ALTERATION)
 844                     xp = -dir_;
 845                 }
 846             }
 847
 848           ye.widen (thickness_ * 0.5);
 849           xe.widen (thickness_ * 1.0);
 850           Extra_collision_info info (g, xp, xe, ye, penalty);
 851           collision_infos.push_back (info);
 852         }
 853     }
 854
 855   return collision_infos;
 856 }
 857
 858 Extra_collision_info::Extra_collision_info (Grob *g, Real idx, Interval x, Interval y, Real p)
 859 {
 860   idx_ = idx;
 861   extents_[X_AXIS] = x;
 862   extents_[Y_AXIS] = y;
 863   penalty_ = p;
 864   grob_ = g;
 865   type_ = g->get_property ("avoid-slur");
 866 }
 867
 868 Extra_collision_info::Extra_collision_info ()
 869 {
 870   idx_ = 0.0;
 871   penalty_ = 0.;
 872   grob_ = 0;
 873   type_ = SCM_EOL;
 874 }