lily/slur-scoring.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2011 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 "accidental-interface.hh"
  26 #include "beam.hh"
  27 #include "clef.hh"
  28 #include "directional-element-interface.hh"
  29 #include "libc-extension.hh"
  30 #include "main.hh"
  31 #include "misc.hh"
  32 #include "note-column.hh"
  33 #include "output-def.hh"
  34 #include "paper-column.hh"
  35 #include "pitch.hh"
  36 #include "pointer-group-interface.hh"
  37 #include "slur-configuration.hh"
  38 #include "slur.hh"
  39 #include "spanner.hh"
  40 #include "staff-symbol-referencer.hh"
  41 #include "staff-symbol.hh"
  42 #include "stem.hh"
  43 #include "time-signature.hh"
  44 #include "warn.hh"
  45
  46 /*
  47   TODO:
  48
  49   - curve around flag for y coordinate
  50
  51   - short-cut: try a smaller region first.
  52
  53   - handle non-visible stems better.
  54
  55   - try to prune number of scoring criteria
  56
  57   - take encompass-objects more into account when determining
  58   slur shape
  59
  60   - calculate encompass scoring directly after determining slur shape.
  61
  62   - optimize.
  63 */
  64 struct Slur_score_state;
  65
  66 Slur_score_state::Slur_score_state ()
  67 {
  68   musical_dy_ = 0.0;
  69   valid_ = false;
  70   edge_has_beams_ = false;
  71   has_same_beam_ = false;
  72   is_broken_ = false;
  73   dir_ = CENTER;
  74   slur_ = 0;
  75   common_[X_AXIS] = 0;
  76   common_[Y_AXIS] = 0;
  77 }
  78
  79 Slur_score_state::~Slur_score_state ()
  80 {
  81   junk_pointers (configurations_);
  82 }
  83
  84 /*
  85   If a slur is broken across a line break, the direction
  86   of the post-break slur must be the same as the pre-break
  87   slur.
  88 */
  89 Direction
  90 Slur_score_state::slur_direction () const
  91 {
  92   Grob *left_neighbor = slur_->broken_neighbor (LEFT);
  93
  94   if (left_neighbor && left_neighbor->is_live ())
  95     return get_grob_direction (left_neighbor);
  96
  97   Direction dir = get_grob_direction (slur_);
  98
  99   if (Grob *right_neighbor = slur_->broken_neighbor (RIGHT))
 100     set_grob_direction (right_neighbor, dir);
 101
 102   return dir;
 103 }
 104
 105 Encompass_info
 106 Slur_score_state::get_encompass_info (Grob *col) const
 107 {
 108   Grob *stem = unsmob_grob (col->get_object ("stem"));
 109   Encompass_info ei;
 110
 111   if (!stem)
 112     {
 113       programming_error ("no stem for note column");
 114       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 115       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 116                                          Y_AXIS)[dir_];
 117       return ei;
 118     }
 119   Direction stem_dir = get_grob_direction (stem);
 120
 121   if (Grob *head = Note_column::first_head (col))
 122     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 123   else
 124     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 125
 126   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 127   if (!h)
 128     {
 129       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 130       return ei;
 131     }
 132
 133   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 134
 135   if ((stem_dir == dir_)
 136       && !stem->extent (stem, Y_AXIS).is_empty ())
 137     {
 138       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 139       if (Grob *b = Stem::get_beam (stem))
 140         ei.stem_ += stem_dir * 0.5 * Beam::get_beam_thickness (b);
 141
 142       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 143       ei.x_ = x.is_empty ()
 144               ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 145               : x.center ();
 146     }
 147   else
 148     ei.stem_ = ei.head_;
 149
 150   return ei;
 151 }
 152
 153 Drul_array<Bound_info>
 154 Slur_score_state::get_bound_info () const
 155 {
 156   Drul_array<Bound_info> extremes;
 157
 158   Direction d = LEFT;
 159   Direction dir = dir_;
 160
 161   do
 162     {
 163       extremes[d].bound_ = slur_->get_bound (d);
 164       if (Note_column::has_interface (extremes[d].bound_))
 165         {
 166           extremes[d].note_column_ = extremes[d].bound_;
 167           extremes[d].stem_ = Note_column::get_stem (extremes[d].note_column_);
 168           if (extremes[d].stem_)
 169             {
 170               extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 171
 172               for (int a = X_AXIS; a < NO_AXES; a++)
 173                 {
 174                   Axis ax = Axis (a);
 175                   Interval s = extremes[d].stem_->extent (common_[ax], ax);
 176                   if (s.is_empty ())
 177                     {
 178                       /*
 179                         do not issue warning. This happens for rests and
 180                         whole notes.
 181                       */
 182                       s = Interval (0, 0)
 183                           + extremes[d].stem_->relative_coordinate (common_[ax], ax);
 184                     }
 185                   extremes[d].stem_extent_[ax] = s;
 186                 }
 187
 188               extremes[d].slur_head_
 189                 = Stem::extremal_heads (extremes[d].stem_)[dir];
 190               if (!extremes[d].slur_head_
 191                   && Note_column::has_rests (extremes[d].bound_))
 192                 extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 193               extremes[d].staff_ = Staff_symbol_referencer
 194                                    ::get_staff_symbol (extremes[d].stem_);
 195               extremes[d].staff_space_ = Staff_symbol_referencer
 196                                          ::staff_space (extremes[d].stem_);
 197             }
 198
 199           if (extremes[d].slur_head_)
 200             extremes[d].slur_head_x_extent_
 201               = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 202
 203         }
 204     }
 205   while (flip (&d) != LEFT);
 206
 207   return extremes;
 208 }
 209
 210 void
 211 Slur_score_state::fill (Grob *me)
 212 {
 213   slur_ = dynamic_cast<Spanner *> (me);
 214   columns_
 215     = internal_extract_grob_array (me, ly_symbol2scm ("note-columns"));
 216
 217   if (columns_.empty ())
 218     {
 219       me->suicide ();
 220       return;
 221     }
 222
 223   Slur::replace_breakable_encompass_objects (me);
 224   staff_space_ = Staff_symbol_referencer::staff_space (me);
 225   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 226   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
 227
 228   dir_ = slur_direction ();
 229   parameters_.fill (me);
 230
 231   extract_grob_set (me, "note-columns", columns);
 232   extract_grob_set (me, "encompass-objects", extra_objects);
 233
 234   Spanner *sp = dynamic_cast<Spanner *> (me);
 235
 236   for (int i = X_AXIS; i < NO_AXES; i++)
 237     {
 238       Axis a = (Axis)i;
 239       common_[a] = common_refpoint_of_array (columns, me, a);
 240       common_[a] = common_refpoint_of_array (extra_objects, common_[a], a);
 241
 242       Direction d = LEFT;
 243       do
 244         {
 245           /*
 246             If bound is not in note-columns, we don't want to know about
 247             its Y-position
 248           */
 249           if (a != Y_AXIS)
 250             common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 251         }
 252       while (flip (&d) != LEFT);
 253     }
 254
 255   extremes_ = get_bound_info ();
 256   is_broken_ = (!extremes_[LEFT].note_column_
 257                 || !extremes_[RIGHT].note_column_);
 258
 259   has_same_beam_
 260     = (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 261        && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 262
 263   base_attachments_ = get_base_attachments ();
 264
 265   Drul_array<Real> end_ys
 266     = get_y_attachment_range ();
 267
 268   extra_encompass_infos_ = get_extra_encompass_infos ();
 269
 270   Interval additional_ys (0.0,0.0);
 271
 272   for (vsize i = 0; i < extra_encompass_infos_.size (); i++)
 273     {
 274       if (extra_encompass_infos_[i].extents_[X_AXIS].is_empty ())
 275         continue;
 276
 277       Real y_place = linear_interpolate (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 278                                          base_attachments_[RIGHT][X_AXIS],
 279                                          base_attachments_[LEFT][X_AXIS],
 280                                          end_ys[RIGHT],
 281                                          end_ys[LEFT]);
 282       Real encompass_place = extra_encompass_infos_[i].extents_[Y_AXIS][dir_];
 283       if (extra_encompass_infos_[i].type_ == ly_symbol2scm ("inside")
 284           && minmax (dir_, encompass_place, y_place) == encompass_place
 285           && (!extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("key-signature-interface"))
 286               && !Clef::has_interface (extra_encompass_infos_[i].grob_)
 287               && !Time_signature::has_interface (extra_encompass_infos_[i].grob_)))
 288         {
 289           Direction d = LEFT;
 290           do
 291             additional_ys[d] = minmax (dir_,
 292                                        additional_ys[d],
 293                                        (dir_
 294                                         * (parameters_.encompass_object_range_overshoot_
 295                                            + (y_place - encompass_place)
 296                                               * (normalize (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 297                                                             base_attachments_[RIGHT][X_AXIS],
 298                                                             base_attachments_[LEFT][X_AXIS])
 299                                                + (dir_ == LEFT ? 0 : -1)))));
 300           while (flip (&d) != LEFT);
 301         }
 302     }
 303
 304   Direction d = LEFT;
 305   do
 306     end_ys[d] += additional_ys[d];
 307   while (flip (&d) != LEFT);
 308
 309   configurations_ = enumerate_attachments (end_ys);
 310   for (vsize i = 0; i < columns_.size (); i++)
 311     encompass_infos_.push_back (get_encompass_info (columns_[i]));
 312
 313   valid_ = true;
 314
 315   musical_dy_ = 0.0;
 316   do
 317     {
 318       if (!is_broken_
 319           && extremes_[d].slur_head_)
 320         musical_dy_ += d
 321                        * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 322     }
 323   while (flip (&d) != LEFT);
 324
 325   edge_has_beams_
 326     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 327       || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 328
 329   if (is_broken_)
 330     musical_dy_ = 0.0;
 331 }
 332
 333 MAKE_SCHEME_CALLBACK (Slur, calc_control_points, 1)
 334 SCM
 335 Slur::calc_control_points (SCM smob)
 336 {
 337   Spanner *me = unsmob_spanner (smob);
 338
 339   Slur_score_state state;
 340   state.fill (me);
 341
 342   if (!state.valid_)
 343     return SCM_EOL;
 344
 345   state.generate_curves ();
 346
 347   SCM end_ys = me->get_property ("positions");
 348   SCM inspect_quants = me->get_property ("inspect-quants");
 349   bool debug_slurs = to_boolean (me->layout ()
 350                                  ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")));
 351
 352   if (is_number_pair (inspect_quants))
 353     {
 354       debug_slurs = true;
 355       end_ys = inspect_quants;
 356     }
 357
 358   Slur_configuration *best = NULL;
 359   if (is_number_pair (end_ys))
 360     best = state.get_forced_configuration (ly_scm2interval (end_ys));
 361   else
 362     best = state.get_best_curve ();
 363
 364 #if DEBUG_SLUR_SCORING
 365   if (debug_slurs)
 366     {
 367       string total = best->card ();
 368       total += to_string (" TOTAL=%.2f idx=%d", best->score (), best->index_);
 369       me->set_property ("annotation", ly_string2scm (total));
 370     }
 371 #endif
 372
 373   SCM controls = SCM_EOL;
 374   for (int i = 4; i--;)
 375     {
 376       Offset o = best->curve_.control_[i]
 377                  - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 378                            me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 379       controls = scm_cons (ly_offset2scm (o), controls);
 380     }
 381
 382   return controls;
 383 }
 384
 385 Slur_configuration *
 386 Slur_score_state::get_forced_configuration (Interval ys) const
 387 {
 388   Slur_configuration *best = NULL;
 389   Real mindist = 1e6;
 390   for (vsize i = 0; i < configurations_.size (); i++)
 391     {
 392       Real d = fabs (configurations_[i]->attachment_[LEFT][Y_AXIS] - ys[LEFT])
 393                + fabs (configurations_[i]->attachment_[RIGHT][Y_AXIS] - ys[RIGHT]);
 394       if (d < mindist)
 395         {
 396           best = configurations_[i];
 397           mindist = d;
 398         }
 399     }
 400
 401   while (!best->done ())
 402     best->run_next_scorer (*this);
 403
 404   if (mindist > 1e5)
 405     programming_error ("cannot find quant");
 406
 407   return best;
 408 }
 409
 410 Slur_configuration *
 411 Slur_score_state::get_best_curve () const
 412 {
 413   std::priority_queue < Slur_configuration *, std::vector<Slur_configuration *>,
 414       Slur_configuration_less > queue;
 415   for (vsize i = 0; i < configurations_.size (); i++)
 416     queue.push (configurations_[i]);
 417
 418   Slur_configuration *best = NULL;
 419   while (true)
 420     {
 421       best = queue.top ();
 422       if (best->done ())
 423         break;
 424
 425       queue.pop ();
 426       best->run_next_scorer (*this);
 427       queue.push (best);
 428     }
 429
 430   return best;
 431 }
 432
 433 Grob *
 434 Slur_score_state::breakable_bound_item (Direction d) const
 435 {
 436   Grob *col = slur_->get_bound (d)->get_column ();
 437
 438   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 439
 440   for (vsize i = 0; i < extra_encompasses.size (); i++)
 441     {
 442       Item *item = dynamic_cast<Item *> (extra_encompasses[i]);
 443       if (item && col == item->get_column ())
 444         return item;
 445     }
 446
 447   return 0;
 448 }
 449
 450 /*
 451   TODO: should analyse encompasses to determine sensible region, and
 452   should limit slopes available.
 453 */
 454
 455 Drul_array<Real>
 456 Slur_score_state::get_y_attachment_range () const
 457 {
 458   Drul_array<Real> end_ys;
 459   Direction d = LEFT;
 460   do
 461     {
 462       if (extremes_[d].note_column_)
 463         {
 464           end_ys[d] = dir_
 465                       * max (max (dir_ * (base_attachments_[d][Y_AXIS]
 466                                           + parameters_.region_size_ * dir_),
 467                                   dir_ * (dir_ + extremes_[d].note_column_->extent (common_[Y_AXIS], Y_AXIS)[dir_])),
 468                              dir_ * base_attachments_[-d][Y_AXIS]);
 469         }
 470       else
 471         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 472     }
 473   while (flip (&d) != LEFT);
 474
 475   return end_ys;
 476 }
 477
 478 bool
 479 spanner_less (Spanner *s1, Spanner *s2)
 480 {
 481   Slice b1, b2;
 482   Direction d = LEFT;
 483   do
 484     {
 485       b1[d] = s1->get_bound (d)->get_column ()->get_rank ();
 486       b2[d] = s2->get_bound (d)->get_column ()->get_rank ();
 487     }
 488   while (flip (&d) != LEFT);
 489
 490   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 491          && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 492 }
 493
 494 Drul_array<Offset>
 495 Slur_score_state::get_base_attachments () const
 496 {
 497   Drul_array<Offset> base_attachment;
 498   Direction d = LEFT;
 499   do
 500     {
 501       Grob *stem = extremes_[d].stem_;
 502       Grob *head = extremes_[d].slur_head_;
 503
 504       Real x = 0.0;
 505       Real y = 0.0;
 506       if (extremes_[d].note_column_)
 507         {
 508
 509           /*
 510             fixme: X coord should also be set in this case.
 511           */
 512           if (stem
 513               && !Stem::is_invisible (stem)
 514               && extremes_[d].stem_dir_ == dir_
 515               && Stem::get_beaming (stem, -d)
 516               && Stem::get_beam (stem)
 517               && (!spanner_less (slur_, Stem::get_beam (stem))
 518                   || has_same_beam_))
 519             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 520           else if (head)
 521             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 522           y += dir_ * 0.5 * staff_space_;
 523
 524           y = move_away_from_staffline (y, head);
 525
 526           Grob *fh = Note_column::first_head (extremes_[d].note_column_);
 527           x
 528             = (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 529                : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 530               .linear_combination (CENTER);
 531         }
 532       base_attachment[d] = Offset (x, y);
 533     }
 534   while (flip (&d) != LEFT);
 535
 536   do
 537     {
 538       if (!extremes_[d].note_column_)
 539         {
 540           Real x = 0;
 541           Real y = 0;
 542
 543           if (Grob *g = breakable_bound_item (d))
 544             {
 545               x = robust_relative_extent (g, common_[X_AXIS], X_AXIS)[RIGHT];
 546             }
 547           else if (d == RIGHT)
 548             x = robust_relative_extent (extremes_[d].bound_, common_[X_AXIS], X_AXIS)[d];
 549           else
 550             x = slur_->get_broken_left_end_align ();
 551
 552           Grob *col = (d == LEFT) ? columns_[0] : columns_.back ();
 553
 554           if (extremes_[-d].bound_ != col)
 555             {
 556               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 557               y += dir_ * 0.5 * staff_space_;
 558
 559               if (get_grob_direction (col) == dir_
 560                   && Note_column::get_stem (col)
 561                   && !Stem::is_invisible (Note_column::get_stem (col)))
 562                 y -= dir_ * 1.5 * staff_space_;
 563             }
 564           else
 565             y = base_attachment[-d][Y_AXIS];
 566
 567           y = move_away_from_staffline (y, col);
 568
 569           base_attachment[d] = Offset (x, y);
 570         }
 571     }
 572   while (flip (&d) != LEFT);
 573
 574   do
 575     {
 576       for (int a = X_AXIS; a < NO_AXES; a++)
 577         {
 578           Real &b = base_attachment[d][Axis (a)];
 579
 580           if (isinf (b) || isnan (b))
 581             {
 582               programming_error ("slur attachment is inf/nan");
 583               b = 0.0;
 584             }
 585         }
 586     }
 587   while (flip (&d) != LEFT);
 588
 589   return base_attachment;
 590 }
 591
 592 Real
 593 Slur_score_state::move_away_from_staffline (Real y,
 594                                             Grob *on_staff) const
 595 {
 596   if (!on_staff)
 597     return y;
 598
 599   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
 600   if (!staff_symbol)
 601     return y;
 602
 603   Real pos
 604     = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
 605                                               Y_AXIS))
 606       * 2.0 / staff_space_;
 607
 608   if (fabs (pos - my_round (pos)) < 0.2
 609       && Staff_symbol_referencer::on_line (on_staff, (int) rint (pos))
 610       && Staff_symbol_referencer::line_count (on_staff) - 1 >= rint (pos))
 611     y += 1.5 * staff_space_ * dir_ / 10;
 612
 613   return y;
 614 }
 615
 616 vector<Offset>
 617 Slur_score_state::generate_avoid_offsets () const
 618 {
 619   vector<Offset> avoid;
 620   vector<Grob *> encompasses = columns_;
 621
 622   for (vsize i = 0; i < encompasses.size (); i++)
 623     {
 624       if (extremes_[LEFT].note_column_ == encompasses[i]
 625           || extremes_[RIGHT].note_column_ == encompasses[i])
 626         continue;
 627
 628       Encompass_info inf (get_encompass_info (encompasses[i]));
 629       Real y = dir_ * (max (dir_ * inf.head_, dir_ * inf.stem_));
 630
 631       avoid.push_back (Offset (inf.x_, y + dir_ * parameters_.free_head_distance_));
 632     }
 633
 634   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 635   for (vsize i = 0; i < extra_encompasses.size (); i++)
 636     {
 637       if (Slur::has_interface (extra_encompasses[i]))
 638         {
 639           Grob *small_slur = extra_encompasses[i];
 640           Bezier b = Slur::get_curve (small_slur);
 641
 642           Offset z = b.curve_point (0.5);
 643           z += Offset (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 644                        small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 645
 646           z[Y_AXIS] += dir_ * parameters_.free_slur_distance_;
 647           avoid.push_back (z);
 648         }
 649       else if (extra_encompasses[i]->get_property ("avoid-slur") == ly_symbol2scm ("inside"))
 650         {
 651           Grob *g = extra_encompasses [i];
 652           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 653           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 654
 655           if (!xe.is_empty ()
 656               && !ye.is_empty ())
 657             avoid.push_back (Offset (xe.center (), ye[dir_]));
 658         }
 659     }
 660   return avoid;
 661 }
 662
 663 void
 664 Slur_score_state::generate_curves () const
 665 {
 666   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 667   Real h_inf = staff_space_ * scm_to_double (slur_->get_property ("height-limit"));
 668
 669   vector<Offset> avoid = generate_avoid_offsets ();
 670   for (vsize i = 0; i < configurations_.size (); i++)
 671     configurations_[i]->generate_curve (*this, r_0, h_inf, avoid);
 672 }
 673
 674 vector<Slur_configuration *>
 675 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 676 {
 677   vector<Slur_configuration *> scores;
 678
 679   Drul_array<Offset> os;
 680   os[LEFT] = base_attachments_[LEFT];
 681   Real minimum_length = staff_space_
 682                         * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 683
 684   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 685     {
 686       os[RIGHT] = base_attachments_[RIGHT];
 687       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 688         {
 689           Direction d = LEFT;
 690           Drul_array<bool> attach_to_stem (false, false);
 691           do
 692             {
 693               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 694               if (extremes_[d].stem_
 695                   && !Stem::is_invisible (extremes_[d].stem_)
 696                   && extremes_[d].stem_dir_ == dir_)
 697                 {
 698                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 699                   stem_y.widen (0.25 * staff_space_);
 700                   if (stem_y.contains (os[d][Y_AXIS]))
 701                     {
 702                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 703                                       - d * 0.3;
 704                       attach_to_stem[d] = true;
 705                     }
 706                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 707                            < dir_ * os[d][Y_AXIS]
 708                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ())
 709
 710                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 711                 }
 712             }
 713           while (flip (&d) != LEFT);
 714
 715           Offset dz;
 716           dz = os[RIGHT] - os[LEFT];
 717           if (dz[X_AXIS] < minimum_length
 718               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_)
 719             {
 720               do
 721                 {
 722                   if (extremes_[d].slur_head_
 723                       && !extremes_[d].slur_head_x_extent_.is_empty ())
 724                     {
 725                       os[d][X_AXIS] = extremes_[d].slur_head_x_extent_.center ();
 726                       attach_to_stem[d] = false;
 727                     }
 728                 }
 729               while (flip (&d) != LEFT);
 730             }
 731
 732           dz = os[RIGHT] - os[LEFT];
 733           do
 734             {
 735               if (extremes_[d].slur_head_
 736                   && !attach_to_stem[d])
 737                 {
 738                   /* Horizontally move tilted slurs a little.  Move
 739                      more for bigger tilts.
 740
 741                      TODO: parameter */
 742                   os[d][X_AXIS]
 743                   -= dir_ * extremes_[d].slur_head_x_extent_.length ()
 744                      * sin (dz.arg ()) / 3;
 745                 }
 746             }
 747           while (flip (&d) != LEFT);
 748
 749           scores.push_back (Slur_configuration::new_config (os, scores.size ()));
 750
 751           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 752         }
 753
 754       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 755     }
 756
 757   assert (scores.size () > 0);
 758   return scores;
 759 }
 760
 761 vector<Extra_collision_info>
 762 Slur_score_state::get_extra_encompass_infos () const
 763 {
 764   extract_grob_set (slur_, "encompass-objects", encompasses);
 765   vector<Extra_collision_info> collision_infos;
 766   for (vsize i = encompasses.size (); i--;)
 767     {
 768       if (Slur::has_interface (encompasses[i]))
 769         {
 770           Spanner *small_slur = dynamic_cast<Spanner *> (encompasses[i]);
 771           Bezier b = Slur::get_curve (small_slur);
 772
 773           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 774                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 775
 776           for (int k = 0; k < 3; k++)
 777             {
 778               Direction hdir = Direction (k - 1);
 779
 780               /*
 781                 Only take bound into account if small slur starts
 782                 together with big slur.
 783               */
 784               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 785                 continue;
 786
 787               Offset z = b.curve_point (k / 2.0);
 788               z += relative;
 789
 790               Interval yext;
 791               yext.set_full ();
 792               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 793
 794               Interval xext (-1, 1);
 795               xext = xext * (thickness_ * 2) + z[X_AXIS];
 796               Extra_collision_info info (small_slur,
 797                                          hdir,
 798                                          xext,
 799                                          yext,
 800                                          parameters_.extra_object_collision_penalty_);
 801               collision_infos.push_back (info);
 802             }
 803         }
 804       else
 805         {
 806           Grob *g = encompasses [i];
 807           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 808           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 809
 810           Real xp = 0.0;
 811           Real penalty = parameters_.extra_object_collision_penalty_;
 812           if (Accidental_interface::has_interface (g))
 813             {
 814               penalty = parameters_.accidental_collision_;
 815
 816               Rational alt = ly_scm2rational (g->get_property ("alteration"));
 817               SCM scm_style = g->get_property ("style");
 818               if (!scm_is_symbol (scm_style)
 819                   && !to_boolean (g->get_property ("parenthesized"))
 820                   && !to_boolean (g->get_property ("restore-first")))
 821                 {
 822                   /* End copy accidental.cc */
 823                   if (alt == FLAT_ALTERATION
 824                       || alt == DOUBLE_FLAT_ALTERATION)
 825                     xp = LEFT;
 826                   else if (alt == SHARP_ALTERATION)
 827                     xp = 0.5 * dir_;
 828                   else if (alt == NATURAL_ALTERATION)
 829                     xp = -dir_;
 830                 }
 831             }
 832
 833           ye.widen (thickness_ * 0.5);
 834           xe.widen (thickness_ * 1.0);
 835           Extra_collision_info info (g, xp, xe, ye, penalty);
 836           collision_infos.push_back (info);
 837         }
 838     }
 839
 840   return collision_infos;
 841 }
 842
 843 Extra_collision_info::Extra_collision_info (Grob *g, Real idx, Interval x, Interval y, Real p)
 844 {
 845   idx_ = idx;
 846   extents_[X_AXIS] = x;
 847   extents_[Y_AXIS] = y;
 848   penalty_ = p;
 849   grob_ = g;
 850   type_ = g->get_property ("avoid-slur");
 851 }
 852
 853 Extra_collision_info::Extra_collision_info ()
 854 {
 855   idx_ = 0.0;
 856   penalty_ = 0.;
 857   grob_ = 0;
 858   type_ = SCM_EOL;
 859 }