lily/slur-scoring.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--2012 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 dir = dir_;
 160
 161   for (LEFT_and_RIGHT (d))
 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
 206   return extremes;
 207 }
 208
 209 void
 210 Slur_score_state::fill (Grob *me)
 211 {
 212   slur_ = dynamic_cast<Spanner *> (me);
 213   columns_
 214     = internal_extract_grob_array (me, ly_symbol2scm ("note-columns"));
 215
 216   if (columns_.empty ())
 217     {
 218       me->suicide ();
 219       return;
 220     }
 221
 222   Slur::replace_breakable_encompass_objects (me);
 223   staff_space_ = Staff_symbol_referencer::staff_space (me);
 224   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 225   thickness_ = robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
 226
 227   dir_ = slur_direction ();
 228   parameters_.fill (me);
 229
 230   extract_grob_set (me, "note-columns", columns);
 231   extract_grob_set (me, "encompass-objects", extra_objects);
 232
 233   Spanner *sp = dynamic_cast<Spanner *> (me);
 234
 235   for (int i = X_AXIS; i < NO_AXES; i++)
 236     {
 237       Axis a = (Axis)i;
 238       common_[a] = common_refpoint_of_array (columns, me, a);
 239       common_[a] = common_refpoint_of_array (extra_objects, common_[a], a);
 240
 241       for (LEFT_and_RIGHT (d))
 242         {
 243           /*
 244             If bound is not in note-columns, we don't want to know about
 245             its Y-position
 246           */
 247           if (a != Y_AXIS)
 248             common_[a] = common_[a]->common_refpoint (sp->get_bound (d), a);
 249         }
 250     }
 251
 252   extremes_ = get_bound_info ();
 253   is_broken_ = (!extremes_[LEFT].note_column_
 254                 || !extremes_[RIGHT].note_column_);
 255
 256   has_same_beam_
 257     = (extremes_[LEFT].stem_ && extremes_[RIGHT].stem_
 258        && Stem::get_beam (extremes_[LEFT].stem_) == Stem::get_beam (extremes_[RIGHT].stem_));
 259
 260   base_attachments_ = get_base_attachments ();
 261
 262   Drul_array<Real> end_ys
 263     = get_y_attachment_range ();
 264
 265   extra_encompass_infos_ = get_extra_encompass_infos ();
 266
 267   Interval additional_ys (0.0, 0.0);
 268
 269   for (vsize i = 0; i < extra_encompass_infos_.size (); i++)
 270     {
 271       if (extra_encompass_infos_[i].extents_[X_AXIS].is_empty ())
 272         continue;
 273
 274       Real y_place = linear_interpolate (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 275                                          base_attachments_[RIGHT][X_AXIS],
 276                                          base_attachments_[LEFT][X_AXIS],
 277                                          end_ys[RIGHT],
 278                                          end_ys[LEFT]);
 279       Real encompass_place = extra_encompass_infos_[i].extents_[Y_AXIS][dir_];
 280       if (extra_encompass_infos_[i].type_ == ly_symbol2scm ("inside")
 281           && minmax (dir_, encompass_place, y_place) == encompass_place
 282           && (!extra_encompass_infos_[i].grob_->internal_has_interface (ly_symbol2scm ("key-signature-interface"))
 283               && !Clef::has_interface (extra_encompass_infos_[i].grob_)
 284               && !Time_signature::has_interface (extra_encompass_infos_[i].grob_)))
 285         {
 286           for (LEFT_and_RIGHT (d))
 287             additional_ys[d] = minmax (dir_,
 288                                        additional_ys[d],
 289                                        (dir_
 290                                         * (parameters_.encompass_object_range_overshoot_
 291                                            + (y_place - encompass_place)
 292                                            * (normalize (extra_encompass_infos_[i].extents_[X_AXIS].center (),
 293                                                          base_attachments_[RIGHT][X_AXIS],
 294                                                          base_attachments_[LEFT][X_AXIS])
 295                                               + (dir_ == LEFT ? 0 : -1)))));
 296         }
 297     }
 298
 299   for (LEFT_and_RIGHT (d))
 300     end_ys[d] += additional_ys[d];
 301
 302   configurations_ = enumerate_attachments (end_ys);
 303   for (vsize i = 0; i < columns_.size (); i++)
 304     encompass_infos_.push_back (get_encompass_info (columns_[i]));
 305
 306   valid_ = true;
 307
 308   musical_dy_ = 0.0;
 309   for (LEFT_and_RIGHT (d))
 310     {
 311       if (!is_broken_
 312           && extremes_[d].slur_head_)
 313         musical_dy_ += d
 314                        * extremes_[d].slur_head_->relative_coordinate (common_[Y_AXIS], Y_AXIS);
 315     }
 316
 317   edge_has_beams_
 318     = (extremes_[LEFT].stem_ && Stem::get_beam (extremes_[LEFT].stem_))
 319       || (extremes_[RIGHT].stem_ && Stem::get_beam (extremes_[RIGHT].stem_));
 320
 321   if (is_broken_)
 322     musical_dy_ = 0.0;
 323 }
 324
 325 MAKE_SCHEME_CALLBACK (Slur, calc_control_points, 1)
 326 SCM
 327 Slur::calc_control_points (SCM smob)
 328 {
 329   Spanner *me = unsmob_spanner (smob);
 330
 331   Slur_score_state state;
 332   state.fill (me);
 333
 334   if (!state.valid_)
 335     return SCM_EOL;
 336
 337   state.generate_curves ();
 338
 339   SCM end_ys = me->get_property ("positions");
 340   SCM inspect_quants = me->get_property ("inspect-quants");
 341   bool debug_slurs = to_boolean (me->layout ()
 342                                  ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")));
 343
 344   if (is_number_pair (inspect_quants))
 345     {
 346       debug_slurs = true;
 347       end_ys = inspect_quants;
 348     }
 349
 350   Slur_configuration *best = NULL;
 351   if (is_number_pair (end_ys))
 352     best = state.get_forced_configuration (ly_scm2interval (end_ys));
 353   else
 354     best = state.get_best_curve ();
 355
 356 #if DEBUG_SLUR_SCORING
 357   if (debug_slurs)
 358     {
 359       string total = best->card ();
 360       total += to_string (" TOTAL=%.2f idx=%d", best->score (), best->index_);
 361       me->set_property ("annotation", ly_string2scm (total));
 362     }
 363 #endif
 364
 365   SCM controls = SCM_EOL;
 366   for (int i = 4; i--;)
 367     {
 368       Offset o = best->curve_.control_[i]
 369                  - Offset (me->relative_coordinate (state.common_[X_AXIS], X_AXIS),
 370                            me->relative_coordinate (state.common_[Y_AXIS], Y_AXIS));
 371       controls = scm_cons (ly_offset2scm (o), controls);
 372     }
 373
 374   return controls;
 375 }
 376
 377 Slur_configuration *
 378 Slur_score_state::get_forced_configuration (Interval ys) const
 379 {
 380   Slur_configuration *best = NULL;
 381   Real mindist = 1e6;
 382   for (vsize i = 0; i < configurations_.size (); i++)
 383     {
 384       Real d = fabs (configurations_[i]->attachment_[LEFT][Y_AXIS] - ys[LEFT])
 385                + fabs (configurations_[i]->attachment_[RIGHT][Y_AXIS] - ys[RIGHT]);
 386       if (d < mindist)
 387         {
 388           best = configurations_[i];
 389           mindist = d;
 390         }
 391     }
 392
 393   while (!best->done ())
 394     best->run_next_scorer (*this);
 395
 396   if (mindist > 1e5)
 397     programming_error ("cannot find quant");
 398
 399   return best;
 400 }
 401
 402 Slur_configuration *
 403 Slur_score_state::get_best_curve () const
 404 {
 405   std::priority_queue < Slur_configuration *, std::vector<Slur_configuration *>,
 406       Slur_configuration_less > queue;
 407   for (vsize i = 0; i < configurations_.size (); i++)
 408     queue.push (configurations_[i]);
 409
 410   Slur_configuration *best = NULL;
 411   while (true)
 412     {
 413       best = queue.top ();
 414       if (best->done ())
 415         break;
 416
 417       queue.pop ();
 418       best->run_next_scorer (*this);
 419       queue.push (best);
 420     }
 421
 422   return best;
 423 }
 424
 425 Grob *
 426 Slur_score_state::breakable_bound_item (Direction d) const
 427 {
 428   Grob *col = slur_->get_bound (d)->get_column ();
 429
 430   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 431
 432   for (vsize i = 0; i < extra_encompasses.size (); i++)
 433     {
 434       Item *item = dynamic_cast<Item *> (extra_encompasses[i]);
 435       if (item && col == item->get_column ())
 436         return item;
 437     }
 438
 439   return 0;
 440 }
 441
 442 /*
 443   TODO: should analyse encompasses to determine sensible region, and
 444   should limit slopes available.
 445 */
 446
 447 Drul_array<Real>
 448 Slur_score_state::get_y_attachment_range () const
 449 {
 450   Drul_array<Real> end_ys;
 451   for (LEFT_and_RIGHT (d))
 452     {
 453       if (extremes_[d].note_column_)
 454         {
 455           end_ys[d] = dir_
 456                       * max (max (dir_ * (base_attachments_[d][Y_AXIS]
 457                                           + parameters_.region_size_ * dir_),
 458                                   dir_ * (dir_ + extremes_[d].note_column_->extent (common_[Y_AXIS], Y_AXIS)[dir_])),
 459                              dir_ * base_attachments_[-d][Y_AXIS]);
 460         }
 461       else
 462         end_ys[d] = base_attachments_[d][Y_AXIS] + parameters_.region_size_ * dir_;
 463     }
 464
 465   return end_ys;
 466 }
 467
 468 bool
 469 spanner_less (Spanner *s1, Spanner *s2)
 470 {
 471   Slice b1, b2;
 472   for (LEFT_and_RIGHT (d))
 473     {
 474       b1[d] = s1->get_bound (d)->get_column ()->get_rank ();
 475       b2[d] = s2->get_bound (d)->get_column ()->get_rank ();
 476     }
 477
 478   return b2[LEFT] <= b1[LEFT] && b2[RIGHT] >= b1[RIGHT]
 479          && (b2[LEFT] != b1[LEFT] || b2[RIGHT] != b1[RIGHT]);
 480 }
 481
 482 Drul_array<Offset>
 483 Slur_score_state::get_base_attachments () const
 484 {
 485   Drul_array<Offset> base_attachment;
 486   for (LEFT_and_RIGHT (d))
 487     {
 488       Grob *stem = extremes_[d].stem_;
 489       Grob *head = extremes_[d].slur_head_;
 490
 491       Real x = 0.0;
 492       Real y = 0.0;
 493       if (extremes_[d].note_column_)
 494         {
 495
 496           /*
 497             fixme: X coord should also be set in this case.
 498           */
 499           if (stem
 500               && !Stem::is_invisible (stem)
 501               && extremes_[d].stem_dir_ == dir_
 502               && Stem::get_beaming (stem, -d)
 503               && Stem::get_beam (stem)
 504               && (!spanner_less (slur_, Stem::get_beam (stem))
 505                   || has_same_beam_))
 506             y = extremes_[d].stem_extent_[Y_AXIS][dir_];
 507           else if (head)
 508             y = head->extent (common_[Y_AXIS], Y_AXIS)[dir_];
 509           y += dir_ * 0.5 * staff_space_;
 510
 511           y = move_away_from_staffline (y, head);
 512
 513           Grob *fh = Note_column::first_head (extremes_[d].note_column_);
 514           x
 515             = (fh ? fh->extent (common_[X_AXIS], X_AXIS)
 516                : extremes_[d].bound_->extent (common_[X_AXIS], X_AXIS))
 517               .linear_combination (CENTER);
 518         }
 519       base_attachment[d] = Offset (x, y);
 520     }
 521
 522   for (LEFT_and_RIGHT (d))
 523     {
 524       if (!extremes_[d].note_column_)
 525         {
 526           Real x = 0;
 527           Real y = 0;
 528
 529           if (Grob *g = breakable_bound_item (d))
 530             {
 531               x = robust_relative_extent (g, common_[X_AXIS], X_AXIS)[RIGHT];
 532             }
 533           else if (d == RIGHT)
 534             x = robust_relative_extent (extremes_[d].bound_, common_[X_AXIS], X_AXIS)[d];
 535           else
 536             x = slur_->get_broken_left_end_align ();
 537
 538           Grob *col = (d == LEFT) ? columns_[0] : columns_.back ();
 539
 540           if (extremes_[-d].bound_ != col)
 541             {
 542               y = robust_relative_extent (col, common_[Y_AXIS], Y_AXIS)[dir_];
 543               y += dir_ * 0.5 * staff_space_;
 544
 545               if (get_grob_direction (col) == dir_
 546                   && Note_column::get_stem (col)
 547                   && !Stem::is_invisible (Note_column::get_stem (col)))
 548                 y -= dir_ * 1.5 * staff_space_;
 549             }
 550           else
 551             y = base_attachment[-d][Y_AXIS];
 552
 553           y = move_away_from_staffline (y, col);
 554
 555           base_attachment[d] = Offset (x, y);
 556         }
 557     }
 558
 559   for (LEFT_and_RIGHT (d))
 560     {
 561       for (int a = X_AXIS; a < NO_AXES; a++)
 562         {
 563           Real &b = base_attachment[d][Axis (a)];
 564
 565           if (isinf (b) || isnan (b))
 566             {
 567               programming_error ("slur attachment is inf/nan");
 568               b = 0.0;
 569             }
 570         }
 571     }
 572
 573   return base_attachment;
 574 }
 575
 576 Real
 577 Slur_score_state::move_away_from_staffline (Real y,
 578                                             Grob *on_staff) const
 579 {
 580   if (!on_staff)
 581     return y;
 582
 583   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (on_staff);
 584   if (!staff_symbol)
 585     return y;
 586
 587   Real pos
 588     = (y - staff_symbol->relative_coordinate (common_[Y_AXIS],
 589                                               Y_AXIS))
 590       * 2.0 / staff_space_;
 591
 592   if (fabs (pos - my_round (pos)) < 0.2
 593       && Staff_symbol_referencer::on_line (on_staff, (int) rint (pos))
 594       && Staff_symbol_referencer::line_count (on_staff) - 1 >= rint (pos))
 595     y += 1.5 * staff_space_ * dir_ / 10;
 596
 597   return y;
 598 }
 599
 600 vector<Offset>
 601 Slur_score_state::generate_avoid_offsets () const
 602 {
 603   vector<Offset> avoid;
 604   vector<Grob *> encompasses = columns_;
 605
 606   for (vsize i = 0; i < encompasses.size (); i++)
 607     {
 608       if (extremes_[LEFT].note_column_ == encompasses[i]
 609           || extremes_[RIGHT].note_column_ == encompasses[i])
 610         continue;
 611
 612       Encompass_info inf (get_encompass_info (encompasses[i]));
 613       Real y = dir_ * (max (dir_ * inf.head_, dir_ * inf.stem_));
 614
 615       avoid.push_back (Offset (inf.x_, y + dir_ * parameters_.free_head_distance_));
 616     }
 617
 618   extract_grob_set (slur_, "encompass-objects", extra_encompasses);
 619   for (vsize i = 0; i < extra_encompasses.size (); i++)
 620     {
 621       if (Slur::has_interface (extra_encompasses[i]))
 622         {
 623           Grob *small_slur = extra_encompasses[i];
 624           Bezier b = Slur::get_curve (small_slur);
 625
 626           Offset z = b.curve_point (0.5);
 627           z += Offset (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 628                        small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 629
 630           z[Y_AXIS] += dir_ * parameters_.free_slur_distance_;
 631           avoid.push_back (z);
 632         }
 633       else if (extra_encompasses[i]->get_property ("avoid-slur") == ly_symbol2scm ("inside"))
 634         {
 635           Grob *g = extra_encompasses [i];
 636           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 637           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 638
 639           if (!xe.is_empty ()
 640               && !ye.is_empty ())
 641             avoid.push_back (Offset (xe.center (), ye[dir_]));
 642         }
 643     }
 644   return avoid;
 645 }
 646
 647 void
 648 Slur_score_state::generate_curves () const
 649 {
 650   Real r_0 = robust_scm2double (slur_->get_property ("ratio"), 0.33);
 651   Real h_inf = staff_space_ * scm_to_double (slur_->get_property ("height-limit"));
 652
 653   vector<Offset> avoid = generate_avoid_offsets ();
 654   for (vsize i = 0; i < configurations_.size (); i++)
 655     configurations_[i]->generate_curve (*this, r_0, h_inf, avoid);
 656 }
 657
 658 vector<Slur_configuration *>
 659 Slur_score_state::enumerate_attachments (Drul_array<Real> end_ys) const
 660 {
 661   vector<Slur_configuration *> scores;
 662
 663   Drul_array<Offset> os;
 664   os[LEFT] = base_attachments_[LEFT];
 665   Real minimum_length = staff_space_
 666                         * robust_scm2double (slur_->get_property ("minimum-length"), 2.0);
 667
 668   for (int i = 0; dir_ * os[LEFT][Y_AXIS] <= dir_ * end_ys[LEFT]; i++)
 669     {
 670       os[RIGHT] = base_attachments_[RIGHT];
 671       for (int j = 0; dir_ * os[RIGHT][Y_AXIS] <= dir_ * end_ys[RIGHT]; j++)
 672         {
 673
 674           Drul_array<bool> attach_to_stem (false, false);
 675           for (LEFT_and_RIGHT (d))
 676             {
 677               os[d][X_AXIS] = base_attachments_[d][X_AXIS];
 678               if (extremes_[d].stem_
 679                   && !Stem::is_invisible (extremes_[d].stem_)
 680                   && extremes_[d].stem_dir_ == dir_)
 681                 {
 682                   Interval stem_y = extremes_[d].stem_extent_[Y_AXIS];
 683                   stem_y.widen (0.25 * staff_space_);
 684                   if (stem_y.contains (os[d][Y_AXIS]))
 685                     {
 686                       os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS][-d]
 687                                       - d * 0.3;
 688                       attach_to_stem[d] = true;
 689                     }
 690                   else if (dir_ * extremes_[d].stem_extent_[Y_AXIS][dir_]
 691                            < dir_ * os[d][Y_AXIS]
 692                            && !extremes_[d].stem_extent_[X_AXIS].is_empty ())
 693
 694                     os[d][X_AXIS] = extremes_[d].stem_extent_[X_AXIS].center ();
 695                 }
 696             }
 697
 698           Offset dz;
 699           dz = os[RIGHT] - os[LEFT];
 700           if (dz[X_AXIS] < minimum_length
 701               || fabs (dz[Y_AXIS] / dz[X_AXIS]) > parameters_.max_slope_)
 702             {
 703               for (LEFT_and_RIGHT (d))
 704                 {
 705                   if (extremes_[d].slur_head_
 706                       && !extremes_[d].slur_head_x_extent_.is_empty ())
 707                     {
 708                       os[d][X_AXIS] = extremes_[d].slur_head_x_extent_.center ();
 709                       attach_to_stem[d] = false;
 710                     }
 711                 }
 712             }
 713
 714           dz = os[RIGHT] - os[LEFT];
 715           for (LEFT_and_RIGHT (d))
 716             {
 717               if (extremes_[d].slur_head_
 718                   && !attach_to_stem[d])
 719                 {
 720                   /* Horizontally move tilted slurs a little.  Move
 721                      more for bigger tilts.
 722
 723                      TODO: parameter */
 724                   os[d][X_AXIS]
 725                   -= dir_ * extremes_[d].slur_head_x_extent_.length ()
 726                      * sin (dz.arg ()) / 3;
 727                 }
 728             }
 729
 730           scores.push_back (Slur_configuration::new_config (os, scores.size ()));
 731
 732           os[RIGHT][Y_AXIS] += dir_ * staff_space_ / 2;
 733         }
 734
 735       os[LEFT][Y_AXIS] += dir_ * staff_space_ / 2;
 736     }
 737
 738   assert (scores.size () > 0);
 739   return scores;
 740 }
 741
 742 vector<Extra_collision_info>
 743 Slur_score_state::get_extra_encompass_infos () const
 744 {
 745   extract_grob_set (slur_, "encompass-objects", encompasses);
 746   vector<Extra_collision_info> collision_infos;
 747   for (vsize i = encompasses.size (); i--;)
 748     {
 749       if (Slur::has_interface (encompasses[i]))
 750         {
 751           Spanner *small_slur = dynamic_cast<Spanner *> (encompasses[i]);
 752           Bezier b = Slur::get_curve (small_slur);
 753
 754           Offset relative (small_slur->relative_coordinate (common_[X_AXIS], X_AXIS),
 755                            small_slur->relative_coordinate (common_[Y_AXIS], Y_AXIS));
 756
 757           for (int k = 0; k < 3; k++)
 758             {
 759               Direction hdir = Direction (k - 1);
 760
 761               /*
 762                 Only take bound into account if small slur starts
 763                 together with big slur.
 764               */
 765               if (hdir && small_slur->get_bound (hdir) != slur_->get_bound (hdir))
 766                 continue;
 767
 768               Offset z = b.curve_point (k / 2.0);
 769               z += relative;
 770
 771               Interval yext;
 772               yext.set_full ();
 773               yext[dir_] = z[Y_AXIS] + dir_ * thickness_ * 1.0;
 774
 775               Interval xext (-1, 1);
 776               xext = xext * (thickness_ * 2) + z[X_AXIS];
 777               Extra_collision_info info (small_slur,
 778                                          hdir,
 779                                          xext,
 780                                          yext,
 781                                          parameters_.extra_object_collision_penalty_);
 782               collision_infos.push_back (info);
 783             }
 784         }
 785       else
 786         {
 787           Grob *g = encompasses [i];
 788           Interval xe = g->extent (common_[X_AXIS], X_AXIS);
 789           Interval ye = g->extent (common_[Y_AXIS], Y_AXIS);
 790           if (Dots::has_interface (g))
 791             ye.widen (0.2);
 792
 793           Real xp = 0.0;
 794           Real penalty = parameters_.extra_object_collision_penalty_;
 795           if (Accidental_interface::has_interface (g))
 796             {
 797               penalty = parameters_.accidental_collision_;
 798
 799               Rational alt = ly_scm2rational (g->get_property ("alteration"));
 800               SCM scm_style = g->get_property ("style");
 801               if (!scm_is_symbol (scm_style)
 802                   && !to_boolean (g->get_property ("parenthesized"))
 803                   && !to_boolean (g->get_property ("restore-first")))
 804                 {
 805                   /* End copy accidental.cc */
 806                   if (alt == FLAT_ALTERATION
 807                       || alt == DOUBLE_FLAT_ALTERATION)
 808                     xp = LEFT;
 809                   else if (alt == SHARP_ALTERATION)
 810                     xp = 0.5 * dir_;
 811                   else if (alt == NATURAL_ALTERATION)
 812                     xp = -dir_;
 813                 }
 814             }
 815
 816           ye.widen (thickness_ * 0.5);
 817           xe.widen (thickness_ * 1.0);
 818           Extra_collision_info info (g, xp, xe, ye, penalty);
 819           collision_infos.push_back (info);
 820         }
 821     }
 822
 823   return collision_infos;
 824 }
 825
 826 Extra_collision_info::Extra_collision_info (Grob *g, Real idx, Interval x, Interval y, Real p)
 827 {
 828   idx_ = idx;
 829   extents_[X_AXIS] = x;
 830   extents_[Y_AXIS] = y;
 831   penalty_ = p;
 832   grob_ = g;
 833   type_ = g->get_property ("avoid-slur");
 834 }
 835
 836 Extra_collision_info::Extra_collision_info ()
 837 {
 838   idx_ = 0.0;
 839   penalty_ = 0.;
 840   grob_ = 0;
 841   type_ = SCM_EOL;
 842 }