lily/lookup.cc

   1 /*
   2   lookup.cc -- implement simple Lookup methods.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8   Jan Nieuwenhuizen <janneke@gnu.org>
   9
  10   TODO
  11       Glissando
  12 */
  13 #include <math.h>
  14 #include <ctype.h>
  15
  16 #include "warn.hh"
  17 #include "dimensions.hh"
  18 #include "bezier.hh"
  19 #include "string-convert.hh"
  20 #include "file-path.hh"
  21 #include "main.hh"
  22 #include "lily-guile.hh"
  23 #include "molecule.hh"
  24 #include "lookup.hh"
  25 #include "font-metric.hh"
  26 #include "interval.hh"
  27
  28 Molecule
  29 Lookup::dot (Offset p, Real radius)
  30 {
  31   SCM at = (scm_list_n (ly_symbol2scm ("dot"),
  32                         gh_double2scm (p[X_AXIS]),
  33                         gh_double2scm (p[Y_AXIS]),
  34                         gh_double2scm (radius),
  35                         SCM_UNDEFINED));
  36   Box box;
  37   box.add_point (p - Offset (radius, radius));
  38   box.add_point (p + Offset (radius, radius));
  39   return Molecule (box, at);
  40 }
  41
  42 Molecule
  43 Lookup::beam (Real slope, Real width, Real thick)
  44 {
  45   Real height = slope * width;
  46   Real min_y = (0 <? height) - thick/2;
  47   Real max_y = (0 >? height) + thick/2;
  48
  49
  50
  51   Box b (Interval (0, width),
  52          Interval (min_y, max_y));
  53
  54
  55   SCM at = scm_list_n (ly_symbol2scm ("beam"),
  56                     gh_double2scm (width),
  57                     gh_double2scm (slope),
  58                     gh_double2scm (thick),
  59                     SCM_UNDEFINED);
  60   return Molecule (b, at);
  61 }
  62
  63 Molecule
  64 Lookup::dashed_slur (Bezier b, Real thick, Real dash)
  65 {
  66   SCM l = SCM_EOL;
  67
  68   for (int i= 4; i -- ;)
  69     {
  70       l = gh_cons (ly_offset2scm (b.control_[i]), l);
  71     }
  72
  73   SCM at = (scm_list_n (ly_symbol2scm ("dashed-slur"),
  74                                gh_double2scm (thick),
  75                                gh_double2scm (dash),
  76                                ly_quote_scm (l),
  77                                SCM_UNDEFINED));
  78
  79   Box box (Interval (0,0),Interval (0,0));
  80   return   Molecule (box, at);
  81 }
  82
  83 Molecule
  84 Lookup::line (Real th, Offset from, Offset to)
  85 {
  86   SCM at = scm_list_n (ly_symbol2scm ("draw-line"),
  87                         gh_double2scm (th),
  88                         gh_double2scm (from[X_AXIS]),
  89                         gh_double2scm (from[Y_AXIS]),
  90                         gh_double2scm (to[X_AXIS]),
  91                         gh_double2scm (to[Y_AXIS]),
  92                         SCM_UNDEFINED);
  93
  94   Box box;
  95   box.add_point (from);
  96   box.add_point (to);
  97
  98   box[X_AXIS].widen (th/2);
  99   box[Y_AXIS].widen (th/2);
 100
 101   return Molecule (box, at);
 102 }
 103
 104 Molecule
 105 Lookup::horizontal_line (Interval w, Real th)
 106 {
 107   SCM at = scm_list_n (ly_symbol2scm ("horizontal-line"),
 108                        gh_double2scm (w[LEFT]),
 109                        gh_double2scm (w[RIGHT]),
 110                        gh_double2scm (th),
 111                        SCM_UNDEFINED);
 112
 113
 114   Box box ;
 115   box[X_AXIS] = w;
 116   box[Y_AXIS] = Interval (-th/2,th/2);
 117
 118   return Molecule (box, at);
 119 }
 120
 121
 122 Molecule
 123 Lookup::blank (Box b)
 124 {
 125   return Molecule (b, scm_makfrom0str (""));
 126 }
 127
 128 Molecule
 129 Lookup::filledbox (Box b)
 130 {
 131   SCM  at  = (scm_list_n (ly_symbol2scm ("filledbox"),
 132                      gh_double2scm (-b[X_AXIS][LEFT]),
 133                      gh_double2scm (b[X_AXIS][RIGHT]),
 134                      gh_double2scm (-b[Y_AXIS][DOWN]),
 135                      gh_double2scm (b[Y_AXIS][UP]),
 136                      SCM_UNDEFINED));
 137
 138   return Molecule (b,at);
 139 }
 140
 141 /*
 142  * round filled box:
 143  *
 144  *   __________________________________
 145  *  /     \  ^           /     \      ^
 146  * |         |blot              |     |
 147  * |       | |dia       |       |     |
 148  * |         |meter             |     |
 149  * |\ _ _ /  v           \ _ _ /|     |
 150  * |                            |     |
 151  * |                            |     | Box
 152  * |                    <------>|     | extent
 153  * |                      blot  |     | (Y_AXIS)
 154  * |                    diameter|     |
 155  * |                            |     |
 156  * |  _ _                  _ _  |     |
 157  * |/     \              /     \|     |
 158  * |                            |     |
 159  * |       |            |       |     |
 160  * |                            |     |
 161  * x\_____/______________\_____/|_____v
 162  * |(0,0)                       |
 163  * |                            |
 164  * |                            |
 165  * |<-------------------------->|
 166  *       Box extent(X_AXIS)
 167  */
 168 Molecule
 169 Lookup::round_filled_box (Box b, Real blotdiameter)
 170 {
 171   if (b.x ().length () < blotdiameter)
 172     {
 173       programming_error (_f ("round filled box horizontal extent smaller than blot; decreasing blot"));
 174       blotdiameter = b.x ().length ();
 175     }
 176   if (b.y ().length () < blotdiameter)
 177     {
 178       programming_error (_f ("round filled box vertical extent smaller than blot; decreasing blot"));
 179       blotdiameter = b.y ().length ();
 180     }
 181
 182   SCM at = (scm_list_n (ly_symbol2scm ("round-filled-box"),
 183                         gh_double2scm (-b[X_AXIS][LEFT]),
 184                         gh_double2scm (b[X_AXIS][RIGHT]),
 185                         gh_double2scm (-b[Y_AXIS][DOWN]),
 186                         gh_double2scm (b[Y_AXIS][UP]),
 187                         gh_double2scm (blotdiameter),
 188                         SCM_UNDEFINED));
 189
 190   return Molecule (b,at);
 191 }
 192
 193
 194
 195 /*
 196  * Create Molecule that represents a filled polygon with round edges.
 197  *
 198  * LIMITATIONS:
 199  *
 200  * (a) Only outer (convex) edges are rounded.
 201  *
 202  * (b) This algorithm works as expected only for polygons whose edges
 203  * do not intersect.  For example, the polygon ((0, 0), (q, 0), (0,
 204  * q), (q, q)) has an intersection at point (q/2, q/2) and therefore
 205  * will give a strange result.  Even non-adjacent edges that just
 206  * touch each other will in general not work as expected for non-null
 207  * blotdiameter.
 208  *
 209  * (c) Given a polygon ((x0, y0), (x1, y1), ... , (x(n-1), y(n-1))),
 210  * if there is a natural number k such that blotdiameter is greater
 211  * than the maximum of { | (x(k mod n), y(k mod n)) - (x((k+1) mod n),
 212  * y((k+1) mod n)) |, | (x(k mod n), y(k mod n)) - (x((k+2) mod n),
 213  * y((k+2) mod n)) |, | (x((k+1) mod n), y((k+1) mod n)) - (x((k+2)
 214  * mod n), y((k+2) mod n)) | }, then the outline of the rounded
 215  * polygon will exceed the outline of the core polygon.  In other
 216  * words: Do not draw rounded polygons that have a leg smaller or
 217  * thinner than blotdiameter (or set blotdiameter to a sufficiently
 218  * small value -- maybe even 0.0)!
 219  *
 220  * NOTE: Limitations (b) and (c) arise from the fact that round edges
 221  * are made by moulding sharp edges to round ones rather than adding
 222  * to a core filled polygon.  For details of these two different
 223  * approaches, see the thread upon the ledger lines patch that started
 224  * on March 25, 2002 on the devel mailing list.  The below version of
 225  * round_filled_polygon() sticks to the moulding model, which the
 226  * majority of the list participants finally voted for.  This,
 227  * however, results in the above limitations and a much increased
 228  * complexity of the algorithm, since it has to compute a shrinked
 229  * polygon -- which is not trivial define precisely and unambigously.
 230  * With the other approach, one simply could move a circle of size
 231  * blotdiameter along all edges of the polygon (which is what the
 232  * postscript routine in the backend effectively does, but on the
 233  * shrinked polygon). --jr
 234  */
 235 Molecule
 236 Lookup::round_filled_polygon (Array<Offset> points, Real blotdiameter)
 237 {
 238   /* TODO: Maybe print a warning if one of the above limitations
 239      applies to the given polygon.  However, this is quite complicated
 240      to check. */
 241
 242   /* remove consecutive duplicate points */
 243   const Real epsilon = 0.01;
 244   for (int i = 0; i < points.size ();)
 245     {
 246       int next_i = (i + 1) % points.size ();
 247       Real d = (points[i] - points[next_i]).length ();
 248       if (d < epsilon)
 249         points.del (next_i);
 250       else
 251         i++;
 252     }
 253
 254   /* special cases: degenerated polygons */
 255   if (points.size () == 0)
 256     return Molecule ();
 257   if (points.size () == 1)
 258     return dot (points[0], 0.5 * blotdiameter);
 259   if (points.size () == 2)
 260     return line (blotdiameter, points[0], points[1]);
 261
 262   /* shrink polygon in size by 0.5 * blotdiameter */
 263   Array<Offset> shrinked_points;
 264   shrinked_points.set_size (points.size ());
 265   bool ccw = 1; // true, if three adjacent points are counterclockwise ordered
 266   for (int i = 0; i < points.size (); i++)
 267     {
 268       int i0 = i;
 269       int i1 = (i + 1) % points.size ();
 270       int i2 = (i + 2) % points.size ();
 271       Offset p0 = points[i0];
 272       Offset p1 = points[i1];
 273       Offset p2 = points[i2];
 274       Offset p10 = p0 - p1;
 275       Offset p12 = p2 - p1;
 276       if (p10.length () != 0.0)
 277         { // recompute ccw
 278           Real phi = p10.arg ();
 279           // rotate (p2 - p0) by (-phi)
 280           Offset q = complex_multiply (p2 - p0, complex_exp (Offset (1.0, -phi)));
 281
 282           if (q[Y_AXIS] > 0)
 283             ccw = 1;
 284           else if (q[Y_AXIS] < 0)
 285             ccw = 0;
 286           else {} // keep ccw unchanged
 287         }
 288       else {} // keep ccw unchanged
 289       Offset p10n = (1.0 / p10.length ()) * p10; // normalize length to 1.0
 290       Offset p12n = (1.0 / p12.length ()) * p12;
 291       Offset p13n = 0.5 * (p10n + p12n);
 292       Offset p14n = 0.5 * (p10n - p12n);
 293       Offset p13;
 294       Real d = p13n.length () * p14n.length (); // distance p3n to line(p1..p0)
 295       if (d < epsilon)
 296         // special case: p0, p1, p2 are on a single line => build
 297         // vector orthogonal to (p2-p0) of length 0.5 blotdiameter
 298         {
 299           p13[X_AXIS] = p10[Y_AXIS];
 300           p13[Y_AXIS] = -p10[X_AXIS];
 301           p13 = (0.5 * blotdiameter / p13.length ()) * p13;
 302         }
 303       else
 304         p13 = (0.5 * blotdiameter / d) * p13n;
 305       shrinked_points[i1] = p1 + ((ccw) ? p13 : -p13);
 306     }
 307
 308   /* build scm expression and bounding box */
 309   SCM shrinked_points_scm = SCM_EOL;
 310   Box box;
 311   for (int i = 0; i < shrinked_points.size (); i++)
 312     {
 313       SCM x = gh_double2scm (shrinked_points[i][X_AXIS]);
 314       SCM y = gh_double2scm (shrinked_points[i][Y_AXIS]);
 315       shrinked_points_scm = gh_cons (x, gh_cons (y, shrinked_points_scm));
 316       box.add_point (points[i]);
 317     }
 318   SCM polygon_scm = scm_list_n (ly_symbol2scm ("polygon"),
 319                                 ly_quote_scm (shrinked_points_scm),
 320                                 gh_double2scm (blotdiameter),
 321                                 SCM_UNDEFINED);
 322
 323   Molecule polygon = Molecule (box, polygon_scm);
 324   shrinked_points.clear ();
 325   return polygon;
 326 }
 327
 328 Molecule
 329 Lookup::frame (Box b, Real thick)
 330 {
 331   Molecule m;
 332   Direction d = LEFT;
 333   for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
 334     {
 335       Axis o = Axis ((a+1)%NO_AXES);
 336       do
 337         {
 338           Box edges;
 339           edges[a] = b[a][d] + 0.5 * thick * Interval (-1, 1);
 340           edges[o][DOWN] = b[o][DOWN] - thick/2;
 341           edges[o][UP] = b[o][UP] + thick/2;
 342
 343           m.add_molecule (filledbox (edges));
 344         }
 345       while (flip (&d) != LEFT);
 346     }
 347   return m;
 348
 349 }
 350
 351 /*
 352   Make a smooth curve along the points
 353  */
 354 Molecule
 355 Lookup::slur (Bezier curve, Real curvethick, Real linethick)
 356 {
 357   Real alpha = (curve.control_[3] - curve.control_[0]).arg ();
 358   Bezier back = curve;
 359   Offset perp = curvethick * complex_exp (Offset (0, alpha + M_PI/2)) * 0.5;
 360   back.reverse ();
 361   back.control_[1] += perp;
 362   back.control_[2] += perp;
 363
 364   curve.control_[1] -= perp;
 365   curve.control_[2] -= perp;
 366
 367   SCM scontrols[8];
 368
 369   for (int i=4; i--;)
 370     scontrols[ i ] = ly_offset2scm (back.control_[i]);
 371   for (int i=4 ; i--;)
 372     scontrols[i+4] = ly_offset2scm (curve.control_[i]);
 373
 374   /*
 375     Need the weird order b.o. the way PS want its arguments
 376    */
 377   int indices[]= {5, 6, 7, 4, 1, 2, 3, 0};
 378   SCM list = SCM_EOL;
 379   for (int i= 8; i--;)
 380     {
 381       list = gh_cons (scontrols[indices[i]], list);
 382     }
 383
 384
 385   SCM at = (scm_list_n (ly_symbol2scm ("bezier-sandwich"),
 386                      ly_quote_scm (list),
 387                      gh_double2scm (linethick),
 388                      SCM_UNDEFINED));
 389   Box b(curve.extent (X_AXIS),
 390         curve.extent (Y_AXIS));
 391
 392   b[X_AXIS].unite (back.extent (X_AXIS));
 393   b[Y_AXIS].unite (back.extent (Y_AXIS));
 394
 395   return Molecule (b, at);
 396 }
 397
 398 /*
 399  * Bezier Sandwich:
 400  *
 401  *                               .|
 402  *                        .       |
 403  *              top .             |
 404  *              . curve           |
 405  *          .                     |
 406  *       .                        |
 407  *     .                          |
 408  *    |                           |
 409  *    |                          .|
 410  *    |                     .
 411  *    |         bottom .
 412  *    |            . curve
 413  *    |         .
 414  *    |      .
 415  *    |   .
 416  *    | .
 417  *    |.
 418  *    |
 419  *
 420  */
 421 Molecule
 422 Lookup::bezier_sandwich (Bezier top_curve, Bezier bottom_curve)
 423 {
 424   /*
 425     Need the weird order b.o. the way PS want its arguments
 426    */
 427   SCM list = SCM_EOL;
 428   list = gh_cons (ly_offset2scm (bottom_curve.control_[3]), list);
 429   list = gh_cons (ly_offset2scm (bottom_curve.control_[0]), list);
 430   list = gh_cons (ly_offset2scm (bottom_curve.control_[1]), list);
 431   list = gh_cons (ly_offset2scm (bottom_curve.control_[2]), list);
 432   list = gh_cons (ly_offset2scm (top_curve.control_[0]), list);
 433   list = gh_cons (ly_offset2scm (top_curve.control_[3]), list);
 434   list = gh_cons (ly_offset2scm (top_curve.control_[2]), list);
 435   list = gh_cons (ly_offset2scm (top_curve.control_[1]), list);
 436
 437   SCM horizontal_bend = scm_list_n (ly_symbol2scm ("bezier-sandwich"),
 438                                     ly_quote_scm (list),
 439                                     gh_double2scm (0.0),
 440                                     SCM_UNDEFINED);
 441
 442   Interval x_extent = top_curve.extent (X_AXIS);
 443   x_extent.unite (bottom_curve.extent (X_AXIS));
 444   Interval y_extent = top_curve.extent (Y_AXIS);
 445   y_extent.unite (bottom_curve.extent (Y_AXIS));
 446   Box b (x_extent, y_extent);
 447
 448   return Molecule (b, horizontal_bend);
 449 }
 450
 451 /*
 452  * Horizontal Slope:
 453  *
 454  *            /|   ^
 455  *           / |   |
 456  *          /  |   | height
 457  *         /   |   |
 458  *        /    |   v
 459  *       |    /
 460  *       |   /
 461  * (0,0) x  /slope=dy/dx
 462  *       | /
 463  *       |/
 464  *
 465  *       <----->
 466  *        width
 467  */
 468 Molecule
 469 Lookup::horizontal_slope (Real width, Real slope, Real height)
 470 {
 471   SCM width_scm = gh_double2scm (width);
 472   SCM slope_scm = gh_double2scm (slope);
 473   SCM height_scm = gh_double2scm (height);
 474   SCM horizontal_slope = scm_list_n (ly_symbol2scm ("beam"),
 475                                      width_scm, slope_scm,
 476                                      height_scm, SCM_UNDEFINED);
 477   Box b (Interval (0, width),
 478          Interval (-height/2, height/2 + width*slope));
 479   return Molecule (b, horizontal_slope);
 480 }
 481
 482 /*
 483   TODO: junk me.
 484  */
 485 Molecule
 486 Lookup::accordion (SCM s, Real staff_space, Font_metric *fm)
 487 {
 488   Molecule m;
 489   String sym = ly_scm2string (ly_car (s));
 490   String reg = ly_scm2string (ly_car (ly_cdr (s)));
 491
 492   if (sym == "Discant")
 493     {
 494       Molecule r = fm->find_by_name ("accordion-accDiscant");
 495       m.add_molecule (r);
 496       if (reg.left_string (1) == "F")
 497         {
 498           Molecule d = fm->find_by_name ("accordion-accDot");
 499           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 500           m.add_molecule (d);
 501           reg = reg.right_string (reg.length ()-1);
 502         }
 503       int eflag = 0x00;
 504       if (reg.left_string (3) == "EEE")
 505         {
 506           eflag = 0x07;
 507           reg = reg.right_string (reg.length ()-3);
 508         }
 509       else if (reg.left_string (2) == "EE")
 510         {
 511           eflag = 0x05;
 512           reg = reg.right_string (reg.length ()-2);
 513         }
 514       else if (reg.left_string (2) == "Eh")
 515         {
 516           eflag = 0x04;
 517           reg = reg.right_string (reg.length ()-2);
 518         }
 519       else if (reg.left_string (1) == "E")
 520         {
 521           eflag = 0x02;
 522           reg = reg.right_string (reg.length ()-1);
 523         }
 524       if (eflag & 0x02)
 525         {
 526           Molecule d = fm->find_by_name ("accordion-accDot");
 527           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 528           m.add_molecule (d);
 529         }
 530       if (eflag & 0x04)
 531         {
 532           Molecule d = fm->find_by_name ("accordion-accDot");
 533           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 534           d.translate_axis (0.8 * staff_space PT, X_AXIS);
 535           m.add_molecule (d);
 536         }
 537       if (eflag & 0x01)
 538         {
 539           Molecule d = fm->find_by_name ("accordion-accDot");
 540           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 541           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 542           m.add_molecule (d);
 543         }
 544       if (reg.left_string (2) == "SS")
 545         {
 546           Molecule d = fm->find_by_name ("accordion-accDot");
 547           d.translate_axis (0.5 * staff_space PT, Y_AXIS);
 548           d.translate_axis (0.4 * staff_space PT, X_AXIS);
 549           m.add_molecule (d);
 550           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 551           m.add_molecule (d);
 552           reg = reg.right_string (reg.length ()-2);
 553         }
 554       if (reg.left_string (1) == "S")
 555         {
 556           Molecule d = fm->find_by_name ("accordion-accDot");
 557           d.translate_axis (0.5 * staff_space PT, Y_AXIS);
 558           m.add_molecule (d);
 559           reg = reg.right_string (reg.length ()-1);
 560         }
 561     }
 562   else if (sym == "Freebase")
 563     {
 564       Molecule r = fm->find_by_name ("accordion-accFreebase");
 565       m.add_molecule (r);
 566       if (reg.left_string (1) == "F")
 567         {
 568           Molecule d = fm->find_by_name ("accordion-accDot");
 569           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 570           m.add_molecule (d);
 571           reg = reg.right_string (reg.length ()-1);
 572         }
 573       if (reg == "E")
 574         {
 575           Molecule d = fm->find_by_name ("accordion-accDot");
 576           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 577           m.add_molecule (d);
 578         }
 579     }
 580   else if (sym == "Bayanbase")
 581     {
 582       Molecule r = fm->find_by_name ("accordion-accBayanbase");
 583       m.add_molecule (r);
 584       if (reg.left_string (1) == "T")
 585         {
 586           Molecule d = fm->find_by_name ("accordion-accDot");
 587           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 588           m.add_molecule (d);
 589           reg = reg.right_string (reg.length ()-1);
 590         }
 591       /* include 4' reed just for completeness. You don't want to use this. */
 592       if (reg.left_string (1) == "F")
 593         {
 594           Molecule d = fm->find_by_name ("accordion-accDot");
 595           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 596           m.add_molecule (d);
 597           reg = reg.right_string (reg.length ()-1);
 598         }
 599       if (reg.left_string (2) == "EE")
 600         {
 601           Molecule d = fm->find_by_name ("accordion-accDot");
 602           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 603           d.translate_axis (0.4 * staff_space PT, X_AXIS);
 604           m.add_molecule (d);
 605           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 606           m.add_molecule (d);
 607           reg = reg.right_string (reg.length ()-2);
 608         }
 609       if (reg.left_string (1) == "E")
 610         {
 611           Molecule d = fm->find_by_name ("accordion-accDot");
 612           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 613           m.add_molecule (d);
 614           reg = reg.right_string (reg.length ()-1);
 615         }
 616     }
 617   else if (sym == "Stdbase")
 618     {
 619       Molecule r = fm->find_by_name ("accordion-accStdbase");
 620       m.add_molecule (r);
 621       if (reg.left_string (1) == "T")
 622         {
 623           Molecule d = fm->find_by_name ("accordion-accDot");
 624           d.translate_axis (staff_space * 3.5 PT, Y_AXIS);
 625           m.add_molecule (d);
 626           reg = reg.right_string (reg.length ()-1);
 627         }
 628       if (reg.left_string (1) == "F")
 629         {
 630           Molecule d = fm->find_by_name ("accordion-accDot");
 631           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 632           m.add_molecule (d);
 633           reg = reg.right_string (reg.length ()-1);
 634         }
 635       if (reg.left_string (1) == "M")
 636         {
 637           Molecule d = fm->find_by_name ("accordion-accDot");
 638           d.translate_axis (staff_space * 2 PT, Y_AXIS);
 639           d.translate_axis (staff_space PT, X_AXIS);
 640           m.add_molecule (d);
 641           reg = reg.right_string (reg.length ()-1);
 642         }
 643       if (reg.left_string (1) == "E")
 644         {
 645           Molecule d = fm->find_by_name ("accordion-accDot");
 646           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 647           m.add_molecule (d);
 648           reg = reg.right_string (reg.length ()-1);
 649         }
 650       if (reg.left_string (1) == "S")
 651         {
 652           Molecule d = fm->find_by_name ("accordion-accDot");
 653           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 654           m.add_molecule (d);
 655           reg = reg.right_string (reg.length ()-1);
 656         }
 657     }
 658   /* ugh maybe try to use regular font for S.B. and B.B and only use one font
 659      for the rectangle */
 660   else if (sym == "SB")
 661     {
 662       Molecule r = fm->find_by_name ("accordion-accSB");
 663       m.add_molecule (r);
 664     }
 665   else if (sym == "BB")
 666     {
 667       Molecule r = fm->find_by_name ("accordion-accBB");
 668       m.add_molecule (r);
 669     }
 670   else if (sym == "OldEE")
 671     {
 672       Molecule r = fm->find_by_name ("accordion-accOldEE");
 673       m.add_molecule (r);
 674     }
 675   else if (sym == "OldEES")
 676     {
 677       Molecule r = fm->find_by_name ("accordion-accOldEES");
 678       m.add_molecule (r);
 679     }
 680   return m;
 681 }
 682
 683 Molecule
 684 Lookup::repeat_slash (Real w, Real s, Real t)
 685 {
 686   SCM wid = gh_double2scm (w);
 687   SCM sl = gh_double2scm (s);
 688   SCM thick = gh_double2scm (t);
 689   SCM slashnodot = scm_list_n (ly_symbol2scm ("repeat-slash"),
 690                             wid, sl, thick, SCM_UNDEFINED);
 691
 692   Box b (Interval (0, w + sqrt (sqr(t/s) + sqr (t))),
 693          Interval (0, w * s));
 694
 695   return Molecule (b, slashnodot); //  http://slashnodot.org
 696 }
 697
 698 Molecule
 699 Lookup::bracket (Axis a, Interval iv, Real thick, Real protude)
 700 {
 701   Box b;
 702   Axis other = Axis((a+1)%2);
 703   b[a] = iv;
 704   b[other] = Interval(-1, 1) * thick * 0.5;
 705
 706   Molecule m =  filledbox (b);
 707
 708   b[a] = Interval (iv[UP] - thick, iv[UP]);
 709   Interval oi = Interval (-thick/2, thick/2 + fabs (protude)) ;
 710   oi *=  sign (protude);
 711   b[other] = oi;
 712   m.add_molecule (filledbox (b));
 713   b[a] = Interval (iv[DOWN], iv[DOWN]  +thick);
 714   m.add_molecule (filledbox(b));
 715
 716   return m;
 717 }
 718
 719 Molecule
 720 Lookup::triangle (Interval iv, Real thick, Real protude)
 721 {
 722   Box b ;
 723   b[X_AXIS] = iv;
 724   b[Y_AXIS] = Interval (0 <? protude , 0 >? protude);
 725
 726   SCM s = scm_list_n (ly_symbol2scm ("symmetric-x-triangle"),
 727                       gh_double2scm (thick),
 728                       gh_double2scm (iv.length()),
 729                       gh_double2scm (protude), SCM_UNDEFINED);
 730
 731   return Molecule (b, s);
 732 }
 733
 734
 735 /*
 736   TODO: use rounded boxes.
 737  */
 738 LY_DEFINE(ly_bracket ,"ly:bracket",
 739           4, 0, 0,
 740           (SCM a, SCM iv, SCM t, SCM p),
 741           "Make a bracket in direction @var{a}. The extent of the bracket is "
 742           "given by @var{iv}. The wings protude by an amount of @var{p}, which "
 743           "may be negative. The thickness is given by @var{t}.")
 744 {
 745   SCM_ASSERT_TYPE(ly_axis_p (a), a, SCM_ARG1, __FUNCTION__, "axis") ;
 746   SCM_ASSERT_TYPE(ly_number_pair_p (iv), iv, SCM_ARG2, __FUNCTION__, "number pair") ;
 747   SCM_ASSERT_TYPE(gh_number_p (t), a, SCM_ARG3, __FUNCTION__, "number") ;
 748   SCM_ASSERT_TYPE(gh_number_p (p), a, SCM_ARG4, __FUNCTION__, "number") ;
 749
 750
 751   return Lookup::bracket ((Axis)gh_scm2int (a), ly_scm2interval (iv),
 752                           gh_scm2double (t),
 753                           gh_scm2double (p)).smobbed_copy ();
 754 }
 755
 756
 757
 758 LY_DEFINE(ly_filled_box ,"ly:round-filled-box",
 759           3, 0, 0,
 760           (SCM xext, SCM yext, SCM blot),
 761           "Make a filled-box of dimensions @var{xext}, @var{yext} and roundness @var{blot}.")
 762 {
 763   SCM_ASSERT_TYPE(ly_number_pair_p (xext), xext, SCM_ARG1, __FUNCTION__, "number pair") ;
 764   SCM_ASSERT_TYPE(ly_number_pair_p (yext), yext, SCM_ARG2, __FUNCTION__, "number pair") ;
 765   SCM_ASSERT_TYPE(gh_number_p (blot), blot, SCM_ARG3, __FUNCTION__, "number") ;
 766
 767   return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)),
 768                                    gh_scm2double (blot)).smobbed_copy ();
 769 }
 770