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 "dots.hh"
  30 #include "libc-extension.hh"
  31 #include "main.hh"
  32 #include "misc.hh"
  33 #include "note-column.hh"
  34 #include "output-def.hh"
  35 #include "paper-column.hh"
  36 #include "pitch.hh"
  37 #include "pointer-group-interface.hh"
  38 #include "slur-configuration.hh"
  39 #include "slur.hh"
  40 #include "spanner.hh"
  41 #include "staff-symbol-referencer.hh"
  42 #include "staff-symbol.hh"
  43 #include "stem.hh"
  44 #include "time-signature.hh"
  45 #include "warn.hh"
  46
  47 /*
  48   TODO:
  49
  50   - curve around flag for y coordinate
  51
  52   - short-cut: try a smaller region first.
  53
  54   - handle non-visible stems better.
  55
  56   - try to prune number of scoring criteria
  57
  58   - take encompass-objects more into account when determining
  59   slur shape
  60
  61   - calculate encompass scoring directly after determining slur shape.
  62
  63   - optimize.
  64 */
  65 struct Slur_score_state;
  66
  67 Slur_score_state::Slur_score_state ()
  68 {
  69   musical_dy_ = 0.0;
  70   valid_ = false;
  71   edge_has_beams_ = false;
  72   has_same_beam_ = false;
  73   is_broken_ = false;
  74   dir_ = CENTER;
  75   slur_ = 0;
  76   common_[X_AXIS] = 0;
  77   common_[Y_AXIS] = 0;
  78 }
  79
  80 Slur_score_state::~Slur_score_state ()
  81 {
  82   junk_pointers (configurations_);
  83 }
  84
  85 /*
  86   If a slur is broken across a line break, the direction
  87   of the post-break slur must be the same as the pre-break
  88   slur.
  89 */
  90 Direction
  91 Slur_score_state::slur_direction () const
  92 {
  93   Grob *left_neighbor = slur_->broken_neighbor (LEFT);
  94
  95   if (left_neighbor && left_neighbor->is_live ())
  96     return get_grob_direction (left_neighbor);
  97
  98   Direction dir = get_grob_direction (slur_);
  99
 100   if (Grob *right_neighbor = slur_->broken_neighbor (RIGHT))
 101     set_grob_direction (right_neighbor, dir);
 102
 103   return dir;
 104 }
 105
 106 Encompass_info
 107 Slur_score_state::get_encompass_info (Grob *col) const
 108 {
 109   Grob *stem = unsmob_grob (col->get_object ("stem"));
 110   Encompass_info ei;
 111
 112   if (!stem)
 113     {
 114       programming_error ("no stem for note column");
 115       ei.x_ = col->relative_coordinate (common_[X_AXIS], X_AXIS);
 116       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS],
 117                                          Y_AXIS)[dir_];
 118       return ei;
 119     }
 120   Direction stem_dir = get_grob_direction (stem);
 121
 122   if (Grob *head = Note_column::first_head (col))
 123     ei.x_ = head->extent (common_[X_AXIS], X_AXIS).center ();
 124   else
 125     ei.x_ = col->extent (common_[X_AXIS], X_AXIS).center ();
 126
 127   Grob *h = Stem::extremal_heads (stem)[Direction (dir_)];
 128   if (!h)
 129     {
 130       ei.head_ = ei.stem_ = col->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 131       return ei;
 132     }
 133
 134   ei.head_ = h->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 135
 136   if ((stem_dir == dir_)
 137       && !stem->extent (stem, Y_AXIS).is_empty ())
 138     {
 139       ei.stem_ = stem->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 140       if (Grob *b = Stem::get_beam (stem))
 141         ei.stem_ += stem_dir * 0.5 * Beam::get_beam_thickness (b);
 142
 143       Interval x = stem->extent (common_[X_AXIS], X_AXIS);
 144       ei.x_ = x.is_empty ()
 145               ? stem->relative_coordinate (common_[X_AXIS], X_AXIS)
 146               : x.center ();
 147     }
 148   else
 149     ei.stem_ = ei.head_;
 150
 151   return ei;
 152 }
 153
 154 Drul_array<Bound_info>
 155 Slur_score_state::get_bound_info () const
 156 {
 157   Drul_array<Bound_info> extremes;
 158
 159   Direction d = LEFT;
 160   Direction dir = dir_;
 161
 162   do
 163     {
 164       extremes[d].bound_ = slur_->get_bound (d);
 165       if (Note_column::has_interface (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           if (extremes[d].stem_)
 170             {
 171               extremes[d].stem_dir_ = get_grob_direction (extremes[d].stem_);
 172
 173               for (int a = X_AXIS; a < NO_AXES; a++)
 174                 {
 175                   Axis ax = Axis (a);
 176                   Interval s = extremes[d].stem_->extent (common_[ax], ax);
 177                   if (s.is_empty ())
 178                     {
 179                       /*
 180                         do not issue warning. This happens for rests and
 181                         whole notes.
 182                       */
 183                       s = Interval (0, 0)
 184                           + extremes[d].stem_->relative_coordinate (common_[ax], ax);
 185                     }
 186                   extremes[d].stem_extent_[ax] = s;
 187                 }
 188
 189               extremes[d].slur_head_
 190                 = Stem::extremal_heads (extremes[d].stem_)[dir];
 191               if (!extremes[d].slur_head_
 192                   && Note_column::has_rests (extremes[d].bound_))
 193                 extremes[d].slur_head_ = Note_column::get_rest (extremes[d].bound_);
 194               extremes[d].staff_ = Staff_symbol_referencer
 195                                    ::get_staff_symbol (extremes[d].stem_);
 196               extremes[d].staff_space_ = Staff_symbol_referencer
 197                                          ::staff_space (extremes[d].stem_);
 198             }
 199
 200           if (extremes[d].slur_head_)
 201             extremes[d].slur_head_x_extent_
 202               = extremes[d].slur_head_->extent (common_[X_AXIS], X_AXIS);
 203
 204         }
 205     }
 206   while (flip (&d) != LEFT);
 207
 208   return extremes;
 209 }
 210
 211 void
 212 Slur_score_state::fill (Grob *me)
 213 {
 214   slur_ = dynamic_cast<Spanner *> (me);
 215   columns_
 216     = internal_extract_grob_array (me, ly_symbol2scm ("note-columns"));
 217
 218   if (columns_.empty ())
 219     {
 220       me->suicide ();
 221       return;
 222     }
 223
 224   Slur::replace_breakable_encompass_objects (me);
 225   staff_space_ = Staff_symbol_referencer::staff_space (me);
 226   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 227   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
 228
 229   dir_ = slur_direction ();
 230   parameters_.fill (me);
 231
 232   extract_grob_set (me, "note-columns", columns);
 233   extract_grob_set (me, "encompass-objects", extra_objects);
 234
 235   Spanner *sp = dynamic_cast<Spanner *> (me);
 236
 237   for (int i = X_AXIS; i < NO_AXES; i++)
 238     {
 239       Axis a = (Axis)i;
 240       common_[a] = common_refpoint_of_array (columns, me, a);
 241       common_[a] = common_refpoint_of_array (extra_objects, common_[a], a);
 242
 243       Direction d = LEFT;
 244       do
 245         {
 246           /*
 247             If bound is not in note-columns, we don't want to know about
 248             its Y-position
 249           */
 250           if (a != Y_AXIS)
 251             common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 252         }
 253       while (flip (&d) != LEFT);
 254     }
 255
 256   extremes_ = get_bound_info ();
 257   is_broken_ = (!extremes_[LEFT].note_column_
 258                 || !extremes_[RIGHT].note_column_);
 259
 260   has_same_beam_
 261     = (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 262        && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 263
 264   base_attachments_ = get_base_attachments ();
 265
 266   Drul_array<Real> end_ys
 267     = get_y_attachment_range ();
 268
 269   extra_encompass_infos_ = get_extra_encompass_infos ();
 270
 271   Interval additional_ys (0.0, 0.0);
 272
 273   for (vsize i = 0; i < extra_encompass_infos_.size (); i++)
 274     {
 275       if (extra_encompass_infos_[i].extents_[X_AXIS].is_empty ())
 276         continue;
 277
 278       Real y_place = linear_interpolate (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 279                                          base_attachments_[RIGHT][X_AXIS],
 280                                          base_attachments_[LEFT][X_AXIS],
 281                                          end_ys[RIGHT],
 282                                          end_ys[LEFT]);
 283       Real encompass_place = extra_encompass_infos_[i].extents_[Y_AXIS][dir_];
 284       if (extra_encompass_infos_[i].type_ == ly_symbol2scm ("inside")
 285           && minmax (dir_, encompass_place, y_place) == encompass_place
 286           && (!extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("key-signature-interface"))
 287               && !Clef::has_interface (extra_encompass_infos_[i].grob_)
 288               && !Time_signature::has_interface (extra_encompass_infos_[i].grob_)))
 289         {
 290           Direction d = LEFT;
 291           do
 292             additional_ys[d] = minmax (dir_,
 293                                        additional_ys[d],
 294                                        (dir_
 295                                         * (parameters_.encompass_object_range_overshoot_
 296                                            + (y_place - encompass_place)
 297                                            * (normalize (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 298                                                          base_attachments_[RIGHT][X_AXIS],
 299                                                          base_attachments_[LEFT][X_AXIS])
 300                                               + (dir_ == LEFT ? 0 : -1)))));
 301           while (flip (&d) != LEFT);
 302         }
 303     }
 304
 305   Direction d = LEFT;
 306   do
 307     end_ys[d] += additional_ys[d];
 308   while (flip (&d) != LEFT);
 309
 310   configurations_ = enumerate_attachments (end_ys);
 311   for (vsize i = 0; i < columns_.size (); i++)
 312     encompass_infos_.push_back (get_encompass_info (columns_[i]));
 313
 314   valid_ = true;
 315
 316   musical_dy_ = 0.0;
 317   do
 318     {
 319       if (!is_broken_
 320           && extremes_[d].slur_head_)
 321         musical_dy_ += d
 322                        * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 323     }
 324   while (flip (&d) != LEFT);
 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 Grob *
 435 Slur_score_state::breakable_bound_item (Direction d) const
 436 {
 437   Grob *col = slur_->get_bound (d)->get_column ();
 438
 439   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 440
 441   for (vsize i = 0; i < extra_encompasses.size (); i++)
 442     {
 443       Item *item = dynamic_cast<Item *> (extra_encompasses[i]);
 444       if (item && col == item->get_column ())
 445         return item;
 446     }
 447
 448   return 0;
 449 }
 450
 451 /*
 452   TODO: should analyse encompasses to determine sensible region, and
 453   should limit slopes available.
 454 */
 455
 456 Drul_array<Real>
 457 Slur_score_state::get_y_attachment_range () const
 458 {
 459   Drul_array<Real> end_ys;
 460   Direction d = LEFT;
 461   do
 462     {
 463       if (extremes_[d].note_column_)
 464         {
 465           end_ys[d] = dir_
 466                       * max (max (dir_ * (base_attachments_[d][Y_AXIS]
 467                                           + parameters_.region_size_ * dir_),
 468                                   dir_ * (dir_ + extremes_[d].note_column_->extent (common_[Y_AXIS], Y_AXIS)[dir_])),
 469                              dir_ * base_attachments_[-d][Y_AXIS]);
 470         }
 471       else
 472         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 473     }
 474   while (flip (&d) != LEFT);
 475
 476   return end_ys;
 477 }
 478
 479 bool
 480 spanner_less (Spanner *s1, Spanner *s2)
 481 {
 482   Slice b1, b2;
 483   Direction d = LEFT;
 484   do
 485     {
 486       b1[d] = s1->get_bound (d)->get_column ()->get_rank ();
 487       b2[d] = s2->get_bound (d)->get_column ()->get_rank ();
 488     }
 489   while (flip (&d) != LEFT);
 490
 491   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 492          && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 493 }
 494
 495 Drul_array<Offset>
 496 Slur_score_state::get_base_attachments () const
 497 {
 498   Drul_array<Offset> base_attachment;
 499   Direction d = LEFT;
 500   do
 501     {
 502       Grob *stem = extremes_[d].stem_;
 503       Grob *head = extremes_[d].slur_head_;
 504
 505       Real x = 0.0;
 506       Real y = 0.0;
 507       if (extremes_[d].note_column_)
 508         {
 509
 510           /*
 511             fixme: X coord should also be set in this case.
 512           */
 513           if (stem
 514               && !Stem::is_invisible (stem)
 515               && extremes_[d].stem_dir_ == dir_
 516               && Stem::get_beaming (stem, -d)
 517               && Stem::get_beam (stem)
 518               && (!spanner_less (slur_, Stem::get_beam (stem))
 519                   || has_same_beam_))
 520             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 521           else if (head)
 522             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 523           y += dir_ * 0.5 * staff_space_;
 524
 525           y = move_away_from_staffline (y, head);
 526
 527           Grob *fh = Note_column::first_head (extremes_[d].note_column_);
 528           x
 529             = (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 530                : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 531               .linear_combination (CENTER);
 532         }
 533       base_attachment[d] = Offset (x, y);
 534     }
 535   while (flip (&d) != LEFT);
 536
 537   do
 538     {
 539       if (!extremes_[d].note_column_)
 540         {
 541           Real x = 0;
 542           Real y = 0;
 543
 544           if (Grob *g = breakable_bound_item (d))
 545             {
 546               x = robust_relative_extent (g, common_[X_AXIS], X_AXIS)[RIGHT];
 547             }
 548           else if (d == RIGHT)
 549             x = robust_relative_extent (extremes_[d].bound_, common_[X_AXIS], X_AXIS)[d];
 550           else
 551             x = slur_->get_broken_left_end_align ();
 552
 553           Grob *col = (d == LEFT) ? columns_[0] : columns_.back ();
 554
 555           if (extremes_[-d].bound_ != col)
 556             {
 557               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 558               y += dir_ * 0.5 * staff_space_;
 559
 560               if (get_grob_direction (col) == dir_
 561                   && Note_column::get_stem (col)
 562                   && !Stem::is_invisible (Note_column::get_stem (col)))
 563                 y -= dir_ * 1.5 * staff_space_;
 564             }
 565           else
 566             y = base_attachment[-d][Y_AXIS];
 567
 568           y = move_away_from_staffline (y, col);
 569
 570           base_attachment[d] = Offset (x, y);
 571         }
 572     }
 573   while (flip (&d) != LEFT);
 574
 575   do
 576     {
 577       for (int a = X_AXIS; a < NO_AXES; a++)
 578         {
 579           Real &b = base_attachment[d][Axis (a)];
 580
 581           if (isinf (b) || isnan (b))
 582             {
 583               programming_error ("slur attachment is inf/nan");
 584               b = 0.0;
 585             }
 586         }
 587     }
 588   while (flip (&d) != LEFT);
 589
 590   return base_attachment;
 591 }
 592
 593 Real
 594 Slur_score_state::move_away_from_staffline (Real y,
 595                                             Grob *on_staff) const
 596 {
 597   if (!on_staff)
 598     return y;
 599
 600   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
 601   if (!staff_symbol)
 602     return y;
 603
 604   Real pos
 605     = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
 606                                               Y_AXIS))
 607       * 2.0 / staff_space_;
 608
 609   if (fabs (pos - my_round (pos)) < 0.2
 610       && Staff_symbol_referencer::on_line (on_staff, (int) rint (pos))
 611       && Staff_symbol_referencer::line_count (on_staff) - 1 >= rint (pos))
 612     y += 1.5 * staff_space_ * dir_ / 10;
 613
 614   return y;
 615 }
 616
 617 vector<Offset>
 618 Slur_score_state::generate_avoid_offsets () const
 619 {
 620   vector<Offset> avoid;
 621   vector<Grob *> encompasses = columns_;
 622
 623   for (vsize i = 0; i < encompasses.size (); i++)
 624     {
 625       if (extremes_[LEFT].note_column_ == encompasses[i]
 626           || extremes_[RIGHT].note_column_ == encompasses[i])
 627         continue;
 628
 629       Encompass_info inf (get_encompass_info (encompasses[i]));
 630       Real y = dir_ * (max (dir_ * inf.head_, dir_ * inf.stem_));
 631
 632       avoid.push_back (Offset (inf.x_, y + dir_ * parameters_.free_head_distance_));
 633     }
 634
 635   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 636   for (vsize i = 0; i < extra_encompasses.size (); i++)
 637     {
 638       if (Slur::has_interface (extra_encompasses[i]))
 639         {
 640           Grob *small_slur = extra_encompasses[i];
 641           Bezier b = Slur::get_curve (small_slur);
 642
 643           Offset z = b.curve_point (0.5);
 644           z += Offset (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 645                        small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 646
 647           z[Y_AXIS] += dir_ * parameters_.free_slur_distance_;
 648           avoid.push_back (z);
 649         }
 650       else if (extra_encompasses[i]->get_property ("avoid-slur") == ly_symbol2scm ("inside"))
 651         {
 652           Grob *g = extra_encompasses [i];
 653           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 654           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 655
 656           if (!xe.is_empty ()
 657               && !ye.is_empty ())
 658             avoid.push_back (Offset (xe.center (), ye[dir_]));
 659         }
 660     }
 661   return avoid;
 662 }
 663
 664 void
 665 Slur_score_state::generate_curves () const
 666 {
 667   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 668   Real h_inf = staff_space_ * scm_to_double (slur_->get_property ("height-limit"));
 669
 670   vector<Offset> avoid = generate_avoid_offsets ();
 671   for (vsize i = 0; i < configurations_.size (); i++)
 672     configurations_[i]->generate_curve (*this, r_0, h_inf, avoid);
 673 }
 674
 675 vector<Slur_configuration *>
 676 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 677 {
 678   vector<Slur_configuration *> scores;
 679
 680   Drul_array<Offset> os;
 681   os[LEFT] = base_attachments_[LEFT];
 682   Real minimum_length = staff_space_
 683                         * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 684
 685   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 686     {
 687       os[RIGHT] = base_attachments_[RIGHT];
 688       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 689         {
 690           Direction d = LEFT;
 691           Drul_array<bool> attach_to_stem (false, false);
 692           do
 693             {
 694               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 695               if (extremes_[d].stem_
 696                   && !Stem::is_invisible (extremes_[d].stem_)
 697                   && extremes_[d].stem_dir_ == dir_)
 698                 {
 699                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 700                   stem_y.widen (0.25 * staff_space_);
 701                   if (stem_y.contains (os[d][Y_AXIS]))
 702                     {
 703                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 704                                       - d * 0.3;
 705                       attach_to_stem[d] = true;
 706                     }
 707                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 708                            < dir_ * os[d][Y_AXIS]
 709                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ())
 710
 711                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 712                 }
 713             }
 714           while (flip (&d) != LEFT);
 715
 716           Offset dz;
 717           dz = os[RIGHT] - os[LEFT];
 718           if (dz[X_AXIS] < minimum_length
 719               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_)
 720             {
 721               do
 722                 {
 723                   if (extremes_[d].slur_head_
 724                       && !extremes_[d].slur_head_x_extent_.is_empty ())
 725                     {
 726                       os[d][X_AXIS] = extremes_[d].slur_head_x_extent_.center ();
 727                       attach_to_stem[d] = false;
 728                     }
 729                 }
 730               while (flip (&d) != LEFT);
 731             }
 732
 733           dz = os[RIGHT] - os[LEFT];
 734           do
 735             {
 736               if (extremes_[d].slur_head_
 737                   && !attach_to_stem[d])
 738                 {
 739                   /* Horizontally move tilted slurs a little.  Move
 740                      more for bigger tilts.
 741
 742                      TODO: parameter */
 743                   os[d][X_AXIS]
 744                   -= dir_ * extremes_[d].slur_head_x_extent_.length ()
 745                      * sin (dz.arg ()) / 3;
 746                 }
 747             }
 748           while (flip (&d) != LEFT);
 749
 750           scores.push_back (Slur_configuration::new_config (os, scores.size ()));
 751
 752           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 753         }
 754
 755       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 756     }
 757
 758   assert (scores.size () > 0);
 759   return scores;
 760 }
 761
 762 vector<Extra_collision_info>
 763 Slur_score_state::get_extra_encompass_infos () const
 764 {
 765   extract_grob_set (slur_, "encompass-objects", encompasses);
 766   vector<Extra_collision_info> collision_infos;
 767   for (vsize i = encompasses.size (); i--;)
 768     {
 769       if (Slur::has_interface (encompasses[i]))
 770         {
 771           Spanner *small_slur = dynamic_cast<Spanner *> (encompasses[i]);
 772           Bezier b = Slur::get_curve (small_slur);
 773
 774           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 775                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 776
 777           for (int k = 0; k < 3; k++)
 778             {
 779               Direction hdir = Direction (k - 1);
 780
 781               /*
 782                 Only take bound into account if small slur starts
 783                 together with big slur.
 784               */
 785               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 786                 continue;
 787
 788               Offset z = b.curve_point (k / 2.0);
 789               z += relative;
 790
 791               Interval yext;
 792               yext.set_full ();
 793               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 794
 795               Interval xext (-1, 1);
 796               xext = xext * (thickness_ * 2) + z[X_AXIS];
 797               Extra_collision_info info (small_slur,
 798                                          hdir,
 799                                          xext,
 800                                          yext,
 801                                          parameters_.extra_object_collision_penalty_);
 802               collision_infos.push_back (info);
 803             }
 804         }
 805       else
 806         {
 807           Grob *g = encompasses [i];
 808           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 809           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 810           if (Dots::has_interface (g))
 811             ye.widen (0.2);
 812
 813           Real xp = 0.0;
 814           Real penalty = parameters_.extra_object_collision_penalty_;
 815           if (Accidental_interface::has_interface (g))
 816             {
 817               penalty = parameters_.accidental_collision_;
 818
 819               Rational alt = ly_scm2rational (g->get_property ("alteration"));
 820               SCM scm_style = g->get_property ("style");
 821               if (!scm_is_symbol (scm_style)
 822                   && !to_boolean (g->get_property ("parenthesized"))
 823                   && !to_boolean (g->get_property ("restore-first")))
 824                 {
 825                   /* End copy accidental.cc */
 826                   if (alt == FLAT_ALTERATION
 827                       || alt == DOUBLE_FLAT_ALTERATION)
 828                     xp = LEFT;
 829                   else if (alt == SHARP_ALTERATION)
 830                     xp = 0.5 * dir_;
 831                   else if (alt == NATURAL_ALTERATION)
 832                     xp = -dir_;
 833                 }
 834             }
 835
 836           ye.widen (thickness_ * 0.5);
 837           xe.widen (thickness_ * 1.0);
 838           Extra_collision_info info (g, xp, xe, ye, penalty);
 839           collision_infos.push_back (info);
 840         }
 841     }
 842
 843   return collision_infos;
 844 }
 845
 846 Extra_collision_info::Extra_collision_info (Grob *g, Real idx, Interval x, Interval y, Real p)
 847 {
 848   idx_ = idx;
 849   extents_[X_AXIS] = x;
 850   extents_[Y_AXIS] = y;
 851   penalty_ = p;
 852   grob_ = g;
 853   type_ = g->get_property ("avoid-slur");
 854 }
 855
 856 Extra_collision_info::Extra_collision_info ()
 857 {
 858   idx_ = 0.0;
 859   penalty_ = 0.;
 860   grob_ = 0;
 861   type_ = SCM_EOL;
 862 }