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 /*
  49   TODO:
  50
  51   - curve around flag for y coordinate
  52
  53   - short-cut: try a smaller region first.
  54
  55   - handle non-visible stems better.
  56
  57   - try to prune number of scoring criteria
  58
  59   - take encompass-objects more into account when determining
  60   slur shape
  61
  62   - calculate encompass scoring directly after determining slur shape.
  63
  64   - optimize.
  65 */
  66 struct Slur_score_state;
  67
  68 Slur_score_state::Slur_score_state ()
  69 {
  70   musical_dy_ = 0.0;
  71   valid_ = false;
  72   edge_has_beams_ = false;
  73   has_same_beam_ = false;
  74   is_broken_ = false;
  75   dir_ = CENTER;
  76   slur_ = 0;
  77   common_[X_AXIS] = 0;
  78   common_[Y_AXIS] = 0;
  79 }
  80
  81 Slur_score_state::~Slur_score_state ()
  82 {
  83   junk_pointers (configurations_);
  84 }
  85
  86 /*
  87   If a slur is broken across a line break, the direction
  88   of the post-break slur must be the same as the pre-break
  89   slur.
  90 */
  91 Direction
  92 Slur_score_state::slur_direction () const
  93 {
  94   Grob *left_neighbor = slur_->broken_neighbor (LEFT);
  95
  96   if (left_neighbor && left_neighbor->is_live ())
  97     return get_grob_direction (left_neighbor);
  98
  99   Direction dir = get_grob_direction (slur_);
 100
 101   if (Grob *right_neighbor = slur_->broken_neighbor (RIGHT))
 102     set_grob_direction (right_neighbor, dir);
 103
 104   return dir;
 105 }
 106
 107 Encompass_info
 108 Slur_score_state::get_encompass_info (Grob *col) const
 109 {
 110   Grob *stem = unsmob<Grob> (col->get_object ("stem"));
 111   Encompass_info ei;
 112
 113   if (!stem)
 114     {
 115       programming_error ("no stem for note column");
 116       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 117       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 118                                          Y_AXIS)[dir_];
 119       return ei;
 120     }
 121   Direction stem_dir = get_grob_direction (stem);
 122
 123   if (Grob *head = Note_column::first_head (col))
 124     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 125   else
 126     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 127
 128   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 129   if (!h)
 130     {
 131       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 132       return ei;
 133     }
 134
 135   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 136
 137   if ((stem_dir == dir_)
 138       && !stem->extent (stem, Y_AXIS).is_empty ())
 139     {
 140       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 141       if (Grob *b = Stem::get_beam (stem))
 142         ei.stem_ += stem_dir * 0.5 * Beam::get_beam_thickness (b);
 143
 144       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 145       ei.x_ = x.is_empty ()
 146               ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 147               : x.center ();
 148     }
 149   else
 150     ei.stem_ = ei.head_;
 151
 152   return ei;
 153 }
 154
 155 Drul_array<Bound_info>
 156 Slur_score_state::get_bound_info () const
 157 {
 158   Drul_array<Bound_info> extremes;
 159
 160   Direction dir = dir_;
 161
 162   for (LEFT_and_RIGHT (d))
 163     {
 164       extremes[d].bound_ = slur_->get_bound (d);
 165       if (has_interface<Note_column> (extremes[d].bound_))
 166         {
 167           extremes[d].note_column_ = extremes[d].bound_;
 168           extremes[d].stem_ = Note_column::get_stem (extremes[d].note_column_);
 169           extremes[d].flag_ = Note_column::get_flag (extremes[d].note_column_);
 170
 171           if (extremes[d].stem_)
 172             {
 173               extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 174
 175               for (int a = X_AXIS; a < NO_AXES; a++)
 176                 {
 177                   Axis ax = Axis (a);
 178                   Interval s = extremes[d].stem_->extent (common_[ax], ax);
 179                   if (extremes[d].flag_)
 180                     s.unite (extremes[d].flag_->extent (common_[ax], ax));
 181                   if (s.is_empty ())
 182                     {
 183                       /*
 184                         do not issue warning. This happens for rests and
 185                         whole notes.
 186                       */
 187                       s = Interval (0, 0)
 188                           + extremes[d].stem_->relative_coordinate (common_[ax], ax);
 189                     }
 190                   extremes[d].stem_extent_[ax] = s;
 191                 }
 192
 193               extremes[d].slur_head_
 194                 = Stem::extremal_heads (extremes[d].stem_)[dir];
 195               if (!extremes[d].slur_head_
 196                   && Note_column::has_rests (extremes[d].bound_))
 197                 extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 198               extremes[d].staff_ = Staff_symbol_referencer
 199                                    ::get_staff_symbol (extremes[d].stem_);
 200               extremes[d].staff_space_ = Staff_symbol_referencer
 201                                          ::staff_space (extremes[d].stem_);
 202             }
 203
 204         }
 205       else if (has_interface<Note_head> (extremes[d].bound_))
 206         {
 207           extremes[d].slur_head_ = extremes[d].bound_;
 208         }
 209       if (extremes[d].slur_head_)
 210         extremes[d].slur_head_x_extent_
 211           = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 212     }
 213
 214   return extremes;
 215 }
 216
 217 void
 218 Slur_score_state::fill (Grob *me)
 219 {
 220   slur_ = dynamic_cast<Spanner *> (me);
 221   columns_
 222     = internal_extract_grob_array (me, ly_symbol2scm ("note-columns"));
 223
 224   if (columns_.empty ())
 225     {
 226       me->suicide ();
 227       return;
 228     }
 229
 230   Slur::replace_breakable_encompass_objects (me);
 231   staff_space_ = Staff_symbol_referencer::staff_space (me);
 232   line_thickness_ = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 233   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * line_thickness_;
 234
 235   dir_ = slur_direction ();
 236   parameters_.fill (me);
 237
 238   extract_grob_set (me, "note-columns", columns);
 239   extract_grob_set (me, "encompass-objects", extra_objects);
 240
 241   Spanner *sp = dynamic_cast<Spanner *> (me);
 242
 243   for (int i = X_AXIS; i < NO_AXES; i++)
 244     {
 245       Axis a = (Axis)i;
 246       common_[a] = common_refpoint_of_array (columns, me, a);
 247       common_[a] = common_refpoint_of_array (extra_objects, common_[a], a);
 248
 249       for (LEFT_and_RIGHT (d))
 250         {
 251           /*
 252             If bound is not in note-columns, we don't want to know about
 253             its Y-position
 254           */
 255           if (a != Y_AXIS)
 256             common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 257         }
 258     }
 259
 260   extremes_ = get_bound_info ();
 261   is_broken_ = (!(extremes_[LEFT].note_column_ || extremes_[LEFT].slur_head_)
 262                 || !(extremes_[RIGHT].note_column_ || extremes_[RIGHT].slur_head_));
 263
 264   has_same_beam_
 265     = (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 266        && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 267
 268   base_attachments_ = get_base_attachments ();
 269
 270   Drul_array<Real> end_ys
 271     = get_y_attachment_range ();
 272
 273   extra_encompass_infos_ = get_extra_encompass_infos ();
 274
 275   Interval additional_ys (0.0, 0.0);
 276
 277   for (vsize i = 0; i < extra_encompass_infos_.size (); i++)
 278     {
 279       if (extra_encompass_infos_[i].extents_[X_AXIS].is_empty ())
 280         continue;
 281
 282       Real y_place = linear_interpolate (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 283                                          base_attachments_[RIGHT][X_AXIS],
 284                                          base_attachments_[LEFT][X_AXIS],
 285                                          end_ys[RIGHT],
 286                                          end_ys[LEFT]);
 287       Real encompass_place = extra_encompass_infos_[i].extents_[Y_AXIS][dir_];
 288       if (scm_is_eq (extra_encompass_infos_[i].type_,
 289                      ly_symbol2scm ("inside"))
 290           && minmax (dir_, encompass_place, y_place) == encompass_place
 291           && (!extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("key-signature-interface"))
 292               && !has_interface<Clef> (extra_encompass_infos_[i].grob_)
 293               && !extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("time-signature-interface"))))
 294         {
 295           for (LEFT_and_RIGHT (d))
 296             additional_ys[d] = minmax (dir_,
 297                                        additional_ys[d],
 298                                        (dir_
 299                                         * (parameters_.encompass_object_range_overshoot_
 300                                            + (y_place - encompass_place)
 301                                            * (normalize (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 302                                                          base_attachments_[RIGHT][X_AXIS],
 303                                                          base_attachments_[LEFT][X_AXIS])
 304                                               + (dir_ == LEFT ? 0 : -1)))));
 305         }
 306     }
 307
 308   for (LEFT_and_RIGHT (d))
 309     end_ys[d] += additional_ys[d];
 310
 311   configurations_ = enumerate_attachments (end_ys);
 312   for (vsize i = 0; i < columns_.size (); i++)
 313     encompass_infos_.push_back (get_encompass_info (columns_[i]));
 314
 315   valid_ = true;
 316
 317   musical_dy_ = 0.0;
 318   for (LEFT_and_RIGHT (d))
 319     {
 320       if (!is_broken_
 321           && extremes_[d].slur_head_)
 322         musical_dy_ += d
 323                        * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 324     }
 325
 326   edge_has_beams_
 327     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 328       || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 329
 330   if (is_broken_)
 331     musical_dy_ = 0.0;
 332 }
 333
 334 MAKE_SCHEME_CALLBACK (Slur, calc_control_points, 1)
 335 SCM
 336 Slur::calc_control_points (SCM smob)
 337 {
 338   Spanner *me = unsmob<Spanner> (smob);
 339
 340   Slur_score_state state;
 341   state.fill (me);
 342
 343   if (!state.valid_)
 344     return SCM_EOL;
 345
 346   state.generate_curves ();
 347
 348   SCM end_ys = me->get_property ("positions");
 349   SCM inspect_quants = me->get_property ("inspect-quants");
 350   bool debug_slurs = to_boolean (me->layout ()
 351                                  ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")));
 352
 353   if (is_number_pair (inspect_quants))
 354     {
 355       debug_slurs = true;
 356       end_ys = inspect_quants;
 357     }
 358
 359   Slur_configuration *best = NULL;
 360   if (is_number_pair (end_ys))
 361     best = state.get_forced_configuration (ly_scm2interval (end_ys));
 362   else
 363     best = state.get_best_curve ();
 364
 365 #if DEBUG_SLUR_SCORING
 366   if (debug_slurs)
 367     {
 368       string total = best->card ();
 369       total += to_string (" TOTAL=%.2f idx=%d", best->score (), best->index_);
 370       me->set_property ("annotation", ly_string2scm (total));
 371     }
 372 #endif
 373
 374   SCM controls = SCM_EOL;
 375   for (int i = 4; i--;)
 376     {
 377       Offset o = best->curve_.control_[i]
 378                  - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 379                            me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 380       controls = scm_cons (ly_offset2scm (o), controls);
 381     }
 382
 383   return controls;
 384 }
 385
 386 Slur_configuration *
 387 Slur_score_state::get_forced_configuration (Interval ys) const
 388 {
 389   Slur_configuration *best = NULL;
 390   Real mindist = 1e6;
 391   for (vsize i = 0; i < configurations_.size (); i++)
 392     {
 393       Real d = fabs (configurations_[i]->attachment_[LEFT][Y_AXIS] - ys[LEFT])
 394                + fabs (configurations_[i]->attachment_[RIGHT][Y_AXIS] - ys[RIGHT]);
 395       if (d < mindist)
 396         {
 397           best = configurations_[i];
 398           mindist = d;
 399         }
 400     }
 401
 402   while (!best->done ())
 403     best->run_next_scorer (*this);
 404
 405   if (mindist > 1e5)
 406     programming_error ("cannot find quant");
 407
 408   return best;
 409 }
 410
 411 Slur_configuration *
 412 Slur_score_state::get_best_curve () const
 413 {
 414   std::priority_queue < Slur_configuration *, std::vector<Slur_configuration *>,
 415       Slur_configuration_less > queue;
 416   for (vsize i = 0; i < configurations_.size (); i++)
 417     queue.push (configurations_[i]);
 418
 419   Slur_configuration *best = NULL;
 420   while (true)
 421     {
 422       best = queue.top ();
 423       if (best->done ())
 424         break;
 425
 426       queue.pop ();
 427       best->run_next_scorer (*this);
 428       queue.push (best);
 429     }
 430
 431   return best;
 432 }
 433
 434 Interval
 435 Slur_score_state::breakable_bound_extent (Direction d) const
 436 {
 437   Grob *col = slur_->get_bound (d)->get_column ();
 438   Interval ret;
 439   ret.set_empty ();
 440
 441   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 442
 443   for (vsize i = 0; i < extra_encompasses.size (); i++)
 444     {
 445       Item *item = dynamic_cast<Item *> (extra_encompasses[i]);
 446       if (item && col == item->get_column ())
 447         ret.unite (robust_relative_extent (item, common_[X_AXIS], X_AXIS));
 448     }
 449
 450   return ret;
 451 }
 452
 453 /*
 454   TODO: should analyse encompasses to determine sensible region, and
 455   should limit slopes available.
 456 */
 457
 458 Drul_array<Real>
 459 Slur_score_state::get_y_attachment_range () const
 460 {
 461   Drul_array<Real> end_ys;
 462   for (LEFT_and_RIGHT (d))
 463     {
 464       if (extremes_[d].note_column_)
 465         {
 466           Interval nc_extent = extremes_[d].note_column_
 467                                ->extent (common_[Y_AXIS], Y_AXIS);
 468           if (nc_extent.is_empty ())
 469             slur_->warning ("slur trying to encompass an empty note column.");
 470           else
 471             end_ys[d] = dir_
 472                         * max (max (dir_ * (base_attachments_[d][Y_AXIS]
 473                                             + parameters_.region_size_ * dir_),
 474                                     dir_ * (dir_ + nc_extent[dir_])),
 475                                dir_ * base_attachments_[-d][Y_AXIS]);
 476         }
 477       else if (extremes_[d].slur_head_)
 478         {
 479           // allow only minimal movement
 480           end_ys[d] = base_attachments_[d][Y_AXIS] + 0.3 * dir_;
 481         }
 482       else
 483         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 484     }
 485
 486   return end_ys;
 487 }
 488
 489 bool
 490 spanner_less (Spanner *s1, Spanner *s2)
 491 {
 492   Slice b1, b2;
 493   for (LEFT_and_RIGHT (d))
 494     {
 495       b1[d] = s1->get_bound (d)->get_column ()->get_rank ();
 496       b2[d] = s2->get_bound (d)->get_column ()->get_rank ();
 497     }
 498
 499   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 500          && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 501 }
 502
 503 Drul_array<Offset>
 504 Slur_score_state::get_base_attachments () const
 505 {
 506   Drul_array<Offset> base_attachment;
 507   for (LEFT_and_RIGHT (d))
 508     {
 509       Grob *stem = extremes_[d].stem_;
 510       Grob *head = extremes_[d].slur_head_;
 511
 512       Real x = 0.0;
 513       Real y = 0.0;
 514       if (extremes_[d].note_column_)
 515         {
 516
 517           /*
 518             fixme: X coord should also be set in this case.
 519           */
 520           if (stem
 521               && !Stem::is_invisible (stem)
 522               && extremes_[d].stem_dir_ == dir_
 523               && Stem::get_beaming (stem, -d)
 524               && Stem::get_beam (stem)
 525               && (!spanner_less (slur_, Stem::get_beam (stem))
 526                   || has_same_beam_))
 527             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 528           else if (head)
 529             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 530           y += dir_ * 0.5 * staff_space_;
 531
 532           y = move_away_from_staffline (y, head);
 533
 534           Grob *fh = Note_column::first_head (extremes_[d].note_column_);
 535           x
 536             = (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 537                : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 538               .linear_combination (CENTER);
 539         }
 540       else if (head)
 541         {
 542           y = head->extent (common_[Y_AXIS], Y_AXIS)
 543             .linear_combination (0.5*dir_);
 544
 545           // Don't "move_away_from_staffline" because that makes it
 546           // harder to recognize the specific attachment point
 547           x = head->extent (common_[X_AXIS], X_AXIS)[-d];
 548         }
 549
 550       base_attachment[d] = Offset (x, y);
 551     }
 552
 553   for (LEFT_and_RIGHT (d))
 554     {
 555       if (!extremes_[d].note_column_ && !extremes_[d].slur_head_)
 556         {
 557           Real x = 0;
 558           Real y = 0;
 559
 560           Interval ext = breakable_bound_extent (d);
 561           if (ext.is_empty ())
 562             ext = Axis_group_interface::
 563                   generic_bound_extent (extremes_[d].bound_,
 564                                         common_[X_AXIS], X_AXIS);
 565           x = ext[-d];
 566
 567           Grob *col = (d == LEFT) ? columns_[0] : columns_.back ();
 568
 569           if (extremes_[-d].bound_ != col)
 570             {
 571               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 572               y += dir_ * 0.5 * staff_space_;
 573
 574               if (get_grob_direction (col) == dir_
 575                   && Note_column::get_stem (col)
 576                   && !Stem::is_invisible (Note_column::get_stem (col)))
 577                 y -= dir_ * 1.5 * staff_space_;
 578             }
 579           else
 580             y = base_attachment[-d][Y_AXIS];
 581
 582           y = move_away_from_staffline (y, col);
 583
 584           base_attachment[d] = Offset (x, y);
 585         }
 586     }
 587
 588   for (LEFT_and_RIGHT (d))
 589     {
 590       for (int a = X_AXIS; a < NO_AXES; a++)
 591         {
 592           Real &b = base_attachment[d][Axis (a)];
 593
 594           if (isinf (b) || isnan (b))
 595             {
 596               programming_error ("slur attachment is inf/nan");
 597               b = 0.0;
 598             }
 599         }
 600     }
 601
 602   return base_attachment;
 603 }
 604
 605 Real
 606 Slur_score_state::move_away_from_staffline (Real y,
 607                                             Grob *on_staff) const
 608 {
 609   if (!on_staff)
 610     return y;
 611
 612   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
 613   if (!staff_symbol)
 614     return y;
 615
 616   Real pos
 617     = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
 618                                               Y_AXIS))
 619       * 2.0 / staff_space_;
 620
 621   if (fabs (pos - my_round (pos)) < 0.2
 622       && Staff_symbol_referencer::on_staff_line (on_staff, (int) rint (pos)))
 623     y += 1.5 * staff_space_ * dir_ / 10;
 624
 625   return y;
 626 }
 627
 628 vector<Offset>
 629 Slur_score_state::generate_avoid_offsets () const
 630 {
 631   vector<Offset> avoid;
 632   vector<Grob *> encompasses = columns_;
 633
 634   for (vsize i = 0; i < encompasses.size (); i++)
 635     {
 636       if (extremes_[LEFT].note_column_ == encompasses[i]
 637           || extremes_[RIGHT].note_column_ == encompasses[i])
 638         continue;
 639
 640       Encompass_info inf (get_encompass_info (encompasses[i]));
 641       Real y = dir_ * (max (dir_ * inf.head_, dir_ * inf.stem_));
 642
 643       avoid.push_back (Offset (inf.x_, y + dir_ * parameters_.free_head_distance_));
 644     }
 645
 646   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 647   for (vsize i = 0; i < extra_encompasses.size (); i++)
 648     {
 649       if (has_interface<Slur> (extra_encompasses[i]))
 650         {
 651           Grob *small_slur = extra_encompasses[i];
 652           Bezier b = Slur::get_curve (small_slur);
 653
 654           Offset z = b.curve_point (0.5);
 655           z += Offset (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 656                        small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 657
 658           z[Y_AXIS] += dir_ * parameters_.free_slur_distance_;
 659           avoid.push_back (z);
 660         }
 661       else if (scm_is_eq (extra_encompasses[i]->get_property ("avoid-slur"),
 662                           ly_symbol2scm ("inside")))
 663         {
 664           Grob *g = extra_encompasses [i];
 665           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 666           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 667
 668           if (!xe.is_empty ()
 669               && !ye.is_empty ())
 670             avoid.push_back (Offset (xe.center (), ye[dir_]));
 671         }
 672     }
 673   return avoid;
 674 }
 675
 676 void
 677 Slur_score_state::generate_curves () const
 678 {
 679   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 680   Real h_inf = staff_space_ * scm_to_double (slur_->get_property ("height-limit"));
 681
 682   vector<Offset> avoid = generate_avoid_offsets ();
 683   for (vsize i = 0; i < configurations_.size (); i++)
 684     configurations_[i]->generate_curve (*this, r_0, h_inf, avoid);
 685 }
 686
 687 vector<Slur_configuration *>
 688 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 689 {
 690   vector<Slur_configuration *> scores;
 691
 692   Drul_array<Offset> os;
 693   os[LEFT] = base_attachments_[LEFT];
 694   Real minimum_length = staff_space_
 695                         * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 696
 697   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 698     {
 699       os[RIGHT] = base_attachments_[RIGHT];
 700       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 701         {
 702
 703           Drul_array<bool> attach_to_stem (false, false);
 704           for (LEFT_and_RIGHT (d))
 705             {
 706               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 707               if (extremes_[d].stem_
 708                   && !Stem::is_invisible (extremes_[d].stem_)
 709                   && extremes_[d].stem_dir_ == dir_)
 710                 {
 711                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 712                   stem_y.widen (0.25 * staff_space_);
 713                   if (stem_y.contains (os[d][Y_AXIS]))
 714                     {
 715                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 716                                       - d * 0.3;
 717                       attach_to_stem[d] = true;
 718                     }
 719                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 720                            < dir_ * os[d][Y_AXIS]
 721                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ())
 722
 723                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 724                 }
 725             }
 726
 727           Offset dz;
 728           dz = os[RIGHT] - os[LEFT];
 729           if (dz[X_AXIS] < minimum_length
 730               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_)
 731             {
 732               for (LEFT_and_RIGHT (d))
 733                 {
 734                   if (extremes_[d].slur_head_
 735                       && !extremes_[d].slur_head_x_extent_.is_empty ())
 736                     {
 737                       os[d][X_AXIS] = extremes_[d].slur_head_x_extent_.center ();
 738                       attach_to_stem[d] = false;
 739                     }
 740                 }
 741             }
 742
 743           dz = (os[RIGHT] - os[LEFT]).direction ();
 744           for (LEFT_and_RIGHT (d))
 745             {
 746               if (extremes_[d].slur_head_
 747                   && !attach_to_stem[d])
 748                 {
 749                   /* Horizontally move tilted slurs a little.  Move
 750                      more for bigger tilts.
 751
 752                      TODO: parameter */
 753                   os[d][X_AXIS]
 754                   -= dir_ * extremes_[d].slur_head_x_extent_.length ()
 755                     * dz[Y_AXIS] / 3;
 756                 }
 757             }
 758
 759           scores.push_back (Slur_configuration::new_config (os, scores.size ()));
 760
 761           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 762         }
 763
 764       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 765     }
 766
 767   assert (scores.size () > 0);
 768   return scores;
 769 }
 770
 771 vector<Extra_collision_info>
 772 Slur_score_state::get_extra_encompass_infos () const
 773 {
 774   extract_grob_set (slur_, "encompass-objects", encompasses);
 775   vector<Extra_collision_info> collision_infos;
 776   for (vsize i = encompasses.size (); i--;)
 777     {
 778       if (has_interface<Slur> (encompasses[i]))
 779         {
 780           Spanner *small_slur = dynamic_cast<Spanner *> (encompasses[i]);
 781           Bezier b = Slur::get_curve (small_slur);
 782
 783           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 784                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 785
 786           for (int k = 0; k < 3; k++)
 787             {
 788               Direction hdir = Direction (k - 1);
 789
 790               /*
 791                 Only take bound into account if small slur starts
 792                 together with big slur.
 793               */
 794               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 795                 continue;
 796
 797               Offset z = b.curve_point (k / 2.0);
 798               z += relative;
 799
 800               Interval yext;
 801               yext.set_full ();
 802               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 803
 804               Interval xext (-1, 1);
 805               xext = xext * (thickness_ * 2) + z[X_AXIS];
 806               Extra_collision_info info (small_slur,
 807                                          hdir,
 808                                          xext,
 809                                          yext,
 810                                          parameters_.extra_object_collision_penalty_);
 811               collision_infos.push_back (info);
 812             }
 813         }
 814       else
 815         {
 816           Grob *g = encompasses [i];
 817           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 818           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 819           if (has_interface<Dots> (g))
 820             ye.widen (0.2);
 821
 822           Real xp = 0.0;
 823           Real penalty = parameters_.extra_object_collision_penalty_;
 824           if (has_interface<Accidental_interface> (g))
 825             {
 826               penalty = parameters_.accidental_collision_;
 827
 828               Rational alt = ly_scm2rational (g->get_property ("alteration"));
 829               SCM scm_style = g->get_property ("style");
 830               if (!scm_is_symbol (scm_style)
 831                   && !to_boolean (g->get_property ("parenthesized"))
 832                   && !to_boolean (g->get_property ("restore-first")))
 833                 {
 834                   /* End copy accidental.cc */
 835                   if (alt == FLAT_ALTERATION
 836                       || alt == DOUBLE_FLAT_ALTERATION)
 837                     xp = LEFT;
 838                   else if (alt == SHARP_ALTERATION)
 839                     xp = 0.5 * dir_;
 840                   else if (alt == NATURAL_ALTERATION)
 841                     xp = -dir_;
 842                 }
 843             }
 844
 845           ye.widen (thickness_ * 0.5);
 846           xe.widen (thickness_ * 1.0);
 847           Extra_collision_info info (g, xp, xe, ye, penalty);
 848           collision_infos.push_back (info);
 849         }
 850     }
 851
 852   return collision_infos;
 853 }
 854
 855 Extra_collision_info::Extra_collision_info (Grob *g, Real idx, Interval x, Interval y, Real p)
 856 {
 857   idx_ = idx;
 858   extents_[X_AXIS] = x;
 859   extents_[Y_AXIS] = y;
 860   penalty_ = p;
 861   grob_ = g;
 862   type_ = g->get_property ("avoid-slur");
 863 }
 864
 865 Extra_collision_info::Extra_collision_info ()
 866 {
 867   idx_ = 0.0;
 868   penalty_ = 0.;
 869   grob_ = 0;
 870   type_ = SCM_EOL;
 871 }