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