lily/tuplet-bracket.cc

   1 /*
   2   tuplet-bracket.cc -- implement Tuplet_bracket
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7   Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 */
   9
  10 /*
  11   TODO:
  12
  13   - tuplet bracket should probably be subject to the same rules as
  14   beam sloping/quanting.
  15
  16   - There is no support for kneed brackets, or nested brackets.
  17
  18   - number placement for parallel beams should be much more advanced:
  19     for sloped beams some extra horizontal offset must be introduced.
  20
  21   - number placement is usually done over the center note, not the
  22     graphical center.
  23
  24  */
  25
  26 #include <math.h>
  27
  28 #include "line-interface.hh"
  29 #include "beam.hh"
  30 #include "box.hh"
  31 #include "warn.hh"
  32 #include "font-interface.hh"
  33 #include "stencil.hh"
  34 #include "output-def.hh"
  35 #include "text-item.hh"
  36 #include "tuplet-bracket.hh"
  37 #include "stem.hh"
  38 #include "note-column.hh"
  39 #include "group-interface.hh"
  40 #include "directional-element-interface.hh"
  41 #include "spanner.hh"
  42 #include "staff-symbol-referencer.hh"
  43 #include "lookup.hh"
  44
  45
  46 static Grob*
  47 get_x_bound_grob (Grob *g, Direction my_dir)
  48 {
  49   if (Note_column::get_stem (g)
  50       && Note_column::dir (g) == my_dir)
  51     {
  52       g = Note_column::get_stem (g);
  53     }
  54   return g;
  55 }
  56
  57
  58
  59 Grob*
  60 Tuplet_bracket::parallel_beam (Grob *me, Link_array<Grob> const &cols, bool *equally_long)
  61 {
  62   /*
  63     ugh: code dup.
  64   */
  65   Grob *s1 = Note_column::get_stem (cols[0]);
  66   Grob *s2 = Note_column::get_stem (cols.top ());
  67
  68   Grob*b1 = s1 ? Stem::get_beam (s1) : 0;
  69   Grob*b2 = s2 ? Stem::get_beam (s2) : 0;
  70
  71   Spanner*sp = dynamic_cast<Spanner*> (me);
  72
  73   *equally_long= false;
  74   if (! (b1 && (b1 == b2) && !sp->is_broken ()))
  75       return 0;
  76
  77   Link_array<Grob> beam_stems = Pointer_group_interface__extract_grobs
  78     (b1, (Grob*)0, "stems");
  79
  80   if (beam_stems.size () == 0)
  81     {
  82       programming_error ("Beam under tuplet bracket has no stems!");
  83       *equally_long = 0;
  84       return 0;
  85     }
  86
  87   *equally_long = (beam_stems[0] == s1 && beam_stems.top () == s2);
  88   return b1;
  89 }
  90
  91
  92 /*
  93   TODO:
  94
  95   in the case that there is no bracket, but there is a (single) beam,
  96   follow beam precisely for determining tuplet number location.
  97
  98  */
  99 MAKE_SCHEME_CALLBACK (Tuplet_bracket,print,1);
 100 SCM
 101 Tuplet_bracket::print (SCM smob)
 102 {
 103   Grob *me= unsmob_grob (smob);
 104   Stencil  mol;
 105   Link_array<Grob> columns=
 106     Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-columns");
 107
 108   if (!columns.size ())
 109     return mol.smobbed_copy ();
 110
 111
 112
 113   {
 114     SCM lp = me->get_property ("left-position");
 115     SCM rp = me->get_property ("right-position");
 116
 117     if (!ly_c_number_p (rp) || !ly_c_number_p (lp))
 118       after_line_breaking (smob);
 119   }
 120
 121   Real ly = robust_scm2double (me->get_property ("left-position"), 0);
 122   Real ry = robust_scm2double (me->get_property ("right-position"), 0);
 123
 124   bool equally_long = false;
 125   Grob * par_beam = parallel_beam (me, columns, &equally_long);
 126
 127   Spanner*sp = dynamic_cast<Spanner*> (me);
 128
 129   bool bracket_visibility = !(par_beam && equally_long);
 130   bool number_visibility = true;
 131
 132   /*
 133     Fixme: the type of this prop is sucky.
 134    */
 135   SCM bracket = me->get_property ("bracket-visibility");
 136   if (ly_c_boolean_p (bracket))
 137     {
 138       bracket_visibility = ly_scm2bool (bracket);
 139     }
 140   else if (bracket == ly_symbol2scm ("if-no-beam"))
 141     bracket_visibility = !par_beam;
 142
 143   SCM numb = me->get_property ("number-visibility");
 144   if (ly_c_boolean_p (numb))
 145     {
 146       number_visibility = ly_scm2bool (numb);
 147     }
 148   else if (numb == ly_symbol2scm ("if-no-beam"))
 149     number_visibility = !par_beam;
 150
 151   Grob * commonx = columns[0]->common_refpoint (columns.top (),X_AXIS);
 152
 153   /*
 154     Tuplet brackets are normally not broken, but we shouldn't crash if
 155     they are.
 156    */
 157   commonx = commonx->common_refpoint (sp->get_bound (LEFT), X_AXIS);
 158   commonx = commonx->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
 159
 160   Direction dir = get_grob_direction (me);
 161
 162   Grob * lgr = get_x_bound_grob (columns[0], dir);
 163   Grob * rgr = get_x_bound_grob (columns.top (), dir);
 164   Real x0 = lgr->extent (commonx,X_AXIS)[LEFT];
 165   Real x1 = rgr->extent (commonx,X_AXIS)[RIGHT];
 166
 167   Real w = x1 -x0;
 168
 169   SCM number = me->get_property ("text");
 170
 171   Output_def *pap = me->get_paper ();
 172   Stencil num;
 173  if (ly_c_string_p (number) && number_visibility)
 174     {
 175       SCM properties = Font_interface::text_font_alist_chain (me);
 176       SCM snum = Text_item::interpret_markup (pap->self_scm (), properties, number);
 177       num = *unsmob_stencil (snum);
 178       num.align_to (X_AXIS, CENTER);
 179       num.translate_axis (w/2, X_AXIS);
 180       num.align_to (Y_AXIS, CENTER);
 181
 182       num.translate_axis ((ry-ly)/2, Y_AXIS);
 183
 184       mol.add_stencil (num);
 185     }
 186
 187
 188   /*
 189     No bracket when it would be smaller than the number.
 190
 191     TODO: should use GAP in calculation too.
 192    */
 193   if (bracket_visibility && number_visibility
 194       && mol.extent (X_AXIS).length () > w)
 195     {
 196       bracket_visibility = false;
 197     }
 198
 199   if (bracket_visibility)
 200     {
 201       Real ss =   Staff_symbol_referencer::staff_space (me);
 202       Real gap=0.;
 203
 204       if (!num.extent (X_AXIS).is_empty ())
 205         gap = num.extent (X_AXIS).length () + 1.0;
 206
 207       SCM fl = me->get_property ("bracket-flare");
 208       SCM eh = me->get_property ("edge-height");
 209       SCM sp = me->get_property ("shorten-pair");
 210
 211       Direction d = LEFT;
 212       Drul_array<Real> height, flare, shorten;
 213       do {
 214         flare[d] =  height[d] = shorten[d] = 0.0;
 215         if (is_number_pair (fl))
 216           flare[d] +=  ss * ly_scm2double (index_get_cell (fl, d));
 217         if (is_number_pair (eh))
 218           height[d] +=  - dir * ss *ly_scm2double (index_get_cell (eh, d));
 219         if (is_number_pair (sp))
 220           shorten[d] +=  ss *ly_scm2double (index_get_cell (sp, d));
 221       }
 222       while (flip (&d) != LEFT);
 223
 224       Stencil brack = make_bracket (me, Y_AXIS,
 225                                      Offset (w, ry - ly),
 226                                      height,
 227                                     /*
 228                                       0.1 = more space at right due to italics
 229                                       TODO: use italic correction of font.
 230                                      */
 231                                     Interval (-0.5, 0.5) * gap + 0.1,
 232                                      flare, shorten);
 233       mol.add_stencil (brack);
 234     }
 235
 236   mol.translate_axis (ly, Y_AXIS);
 237   mol.translate_axis (x0  - sp->get_bound (LEFT)->relative_coordinate (commonx,X_AXIS),X_AXIS);
 238   return mol.smobbed_copy ();
 239 }
 240
 241 /*
 242   should move to lookup?
 243
 244   TODO: this will fail for very short (shorter than the flare)
 245   brackets.
 246  */
 247 Stencil
 248 Tuplet_bracket::make_bracket (Grob *me, // for line properties.
 249                               Axis protusion_axis,
 250                               Offset dz,
 251                               Drul_array<Real> height,
 252                               Interval gap,
 253                               Drul_array<Real> flare,
 254                               Drul_array<Real> shorten)
 255 {
 256   Drul_array<Offset> corners (Offset (0,0), dz);
 257
 258   Real length = dz.length ();
 259   Drul_array<Offset> gap_corners;
 260
 261
 262   Axis bracket_axis = other_axis (protusion_axis);
 263
 264   Drul_array<Offset> straight_corners = corners;
 265
 266   Direction d = LEFT;
 267   do {
 268     straight_corners[d] += - d * shorten[d] /length * dz;
 269   } while (flip (&d) != LEFT);
 270
 271
 272   if (gap.is_empty())
 273     gap = Interval (0,0);
 274   do {
 275     gap_corners[d] = (dz * 0.5) + gap[d] / length * dz;
 276   } while (flip (&d) != LEFT);
 277
 278   Drul_array<Offset> flare_corners = straight_corners;
 279   do {
 280     flare_corners[d][bracket_axis] = straight_corners[d][bracket_axis];
 281     flare_corners[d][protusion_axis] += height[d];
 282     straight_corners[d][bracket_axis] += - d * flare[d];
 283   } while (flip (&d) != LEFT);
 284
 285   Stencil m;
 286   do {
 287     m.add_stencil (Line_interface::line (me, straight_corners[d],
 288                                                  gap_corners[d]));
 289
 290     m.add_stencil (Line_interface::line (me,  straight_corners[d],
 291                                                  flare_corners[d]));
 292   } while (flip (&d) != LEFT);
 293
 294   return m;
 295 }
 296
 297
 298 /*
 299   use first -> last note for slope, and then correct for disturbing
 300   notes in between.  */
 301 void
 302 Tuplet_bracket::calc_position_and_height (Grob*me,Real *offset, Real * dy)
 303 {
 304   Link_array<Grob> columns=
 305     Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-columns");
 306
 307
 308   SCM cols = me->get_property ("note-columns");
 309   Grob * commony = common_refpoint_of_list (cols, me, Y_AXIS);
 310   Grob * commonx = common_refpoint_of_list (cols, me, X_AXIS);
 311
 312   Interval staff;
 313   if (Grob * st = Staff_symbol_referencer::get_staff_symbol (me))
 314     staff = st->extent (commony, Y_AXIS);
 315
 316   Direction dir = get_grob_direction (me);
 317
 318   /*
 319     Use outer non-rest columns to determine slope
 320    */
 321   int l = 0;
 322   while (l <columns.size () && Note_column::has_rests (columns[l]))
 323     l ++;
 324
 325   int r = columns.size ()- 1;
 326   while (r >= l && Note_column::has_rests (columns[r]))
 327     r--;
 328
 329   if (l < r)
 330     {
 331       Interval rv =columns[r]->extent (commony, Y_AXIS);
 332       Interval lv =columns[l]->extent (commony, Y_AXIS);
 333       rv.unite (staff);
 334       lv.unite (staff);
 335       Real graphical_dy =  rv[dir] - lv[dir];
 336
 337       Slice ls = Note_column::head_positions_interval (columns[l]);
 338       Slice rs = Note_column::head_positions_interval (columns[r]);
 339
 340       Interval musical_dy;
 341       musical_dy[UP] = rs[UP] - ls[UP];
 342       musical_dy[DOWN] = rs[DOWN] - ls[DOWN];
 343       if (sign (musical_dy[UP]) != sign (musical_dy[DOWN]))
 344         *dy = 0.0;
 345       else if (sign (graphical_dy) != sign (musical_dy[DOWN]))
 346         *dy = 0.0;
 347       else
 348         *dy = graphical_dy;
 349     }
 350   else
 351     * dy = 0;
 352
 353
 354   *offset = - dir * infinity_f;
 355
 356   if (!columns.size ())
 357     return;
 358
 359
 360
 361   Grob * lgr = get_x_bound_grob (columns[0], dir);
 362   Grob * rgr = get_x_bound_grob (columns.top (), dir);
 363   Real x0 = lgr->extent (commonx,X_AXIS)[LEFT];
 364   Real x1 = rgr->extent (commonx,X_AXIS)[RIGHT];
 365
 366
 367   /*
 368     Slope.
 369   */
 370   Real factor = columns.size () > 1 ? 1/ (x1 - x0) : 1.0;
 371
 372   for (int i = 0; i < columns.size ();  i++)
 373     {
 374       Interval note_ext =columns[i]->extent (commony, Y_AXIS);
 375       note_ext.unite (staff);
 376       Real notey = note_ext[dir] - me->relative_coordinate (commony, Y_AXIS);
 377
 378       Real x = columns[i]->relative_coordinate (commonx, X_AXIS) - x0;
 379       Real tuplety =  *dy * x * factor;
 380
 381       if (notey * dir > (*offset + tuplety) * dir)
 382         *offset = notey - tuplety;
 383     }
 384
 385   // padding
 386   *offset +=  ly_scm2double (me->get_property ("padding")) *dir;
 387
 388
 389   /*
 390     horizontal brackets should not collide with staff lines.
 391
 392    */
 393   Real ss= Staff_symbol_referencer::staff_space (me);
 394   if (*dy == 0 && fabs (*offset) <  ss * Staff_symbol_referencer::staff_radius (me))
 395     {
 396       // quantize, then do collision check.
 397       *offset *= 2 / ss;
 398
 399       *offset = rint (*offset);
 400       if (Staff_symbol_referencer::on_staffline (me, (int) rint (*offset)))
 401         *offset += dir;
 402
 403       *offset *= 0.5 * ss;
 404     }
 405
 406 }
 407
 408
 409
 410 /*
 411   We depend on the beams if there are any.
 412  */
 413 MAKE_SCHEME_CALLBACK (Tuplet_bracket,before_line_breaking,1);
 414 SCM
 415 Tuplet_bracket::before_line_breaking (SCM smob)
 416 {
 417   Grob *me = unsmob_grob (smob);
 418   Link_array<Grob> columns=
 419     Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-columns");
 420
 421
 422   for (int i = columns.size (); i--;)
 423     {
 424       Grob * s =Note_column::get_stem (columns[i]);
 425       Grob * b = s ? Stem::get_beam (s): 0;
 426       if (b)
 427         me->add_dependency (b);
 428     }
 429   return SCM_UNSPECIFIED;
 430 }
 431
 432 MAKE_SCHEME_CALLBACK (Tuplet_bracket,after_line_breaking,1);
 433
 434 SCM
 435 Tuplet_bracket::after_line_breaking (SCM smob)
 436 {
 437   Grob * me = unsmob_grob (smob);
 438   Link_array<Grob> columns=
 439     Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-columns");
 440
 441   if (!columns.size ())
 442     {
 443       me->suicide ();
 444       return SCM_UNSPECIFIED;
 445     }
 446   if (dynamic_cast<Spanner*> (me)->is_broken ())
 447     {
 448       me->warning (_("Killing tuplet bracket across linebreak."));
 449       me->suicide ();
 450       return SCM_UNSPECIFIED;
 451     }
 452
 453   Direction dir = get_grob_direction (me);
 454   if (!dir)
 455     {
 456       dir = Tuplet_bracket::get_default_dir (me);
 457       set_grob_direction (me, dir);
 458     }
 459
 460   bool equally_long = false;
 461   Grob * par_beam = parallel_beam (me, columns, &equally_long);
 462
 463   /*
 464     We follow the beam only if there is one, and we are next to it.
 465    */
 466   Real dy, offset;
 467   if (!par_beam
 468       || get_grob_direction (par_beam) != dir)
 469     {
 470       calc_position_and_height (me,&offset,&dy);
 471     }
 472   else
 473     {
 474       SCM ps =  par_beam->get_property ("positions");
 475
 476       Real lp = ly_scm2double (ly_car (ps));
 477       Real rp = ly_scm2double (ly_cdr (ps));
 478
 479       /*
 480         duh. magic.
 481        */
 482       offset = lp + dir * (0.5 + ly_scm2double (me->get_property ("padding")));
 483       dy = rp- lp;
 484     }
 485
 486
 487   SCM lp =  me->get_property ("left-position");
 488   SCM rp = me->get_property ("right-position");
 489
 490   if (ly_c_number_p (lp) && !ly_c_number_p (rp))
 491     {
 492       rp = scm_make_real (ly_scm2double (lp) + dy);
 493     }
 494   else if (ly_c_number_p (rp) && !ly_c_number_p (lp))
 495     {
 496       lp = scm_make_real (ly_scm2double (rp) - dy);
 497     }
 498   else if (!ly_c_number_p (rp) && !ly_c_number_p (lp))
 499     {
 500       lp = scm_make_real (offset);
 501       rp = scm_make_real (offset +dy);
 502     }
 503
 504   me->set_property ("left-position", lp);
 505   me->set_property ("right-position", rp);
 506
 507   return SCM_UNSPECIFIED;
 508 }
 509
 510
 511 /*
 512   similar to beam ?
 513  */
 514 Direction
 515 Tuplet_bracket::get_default_dir (Grob*me)
 516 {
 517   Drul_array<int> dirs (0,0);
 518   for (SCM s = me->get_property ("note-columns"); ly_c_pair_p (s); s = ly_cdr (s))
 519     {
 520       Grob * nc = unsmob_grob (ly_car (s));
 521       Direction d = Note_column::dir (nc);
 522       if (d)
 523         dirs[d]++;
 524     }
 525
 526   return dirs[UP] >= dirs[DOWN] ? UP : DOWN;
 527 }
 528
 529 void
 530 Tuplet_bracket::add_column (Grob*me, Item*n)
 531 {
 532   Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-columns"), n);
 533   me->add_dependency (n);
 534
 535   add_bound_item (dynamic_cast<Spanner*> (me), n);
 536 }
 537
 538
 539
 540
 541
 542
 543 ADD_INTERFACE (Tuplet_bracket,"tuplet-bracket-interface",
 544   "A bracket with a number in the middle, used for tuplets.",
 545   "note-columns bracket-flare edge-height shorten-pair padding left-position right-position bracket-visibility number-visibility thickness direction");
 546