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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8   Jan Nieuwenhuizen <janneke@gnu.org>
   9 */
  10 #include <math.h>
  11 #include <ctype.h>
  12
  13 #include "line-interface.hh"
  14 #include "warn.hh"
  15 #include "dimensions.hh"
  16 #include "bezier.hh"
  17 #include "string-convert.hh"
  18 #include "file-path.hh"
  19 #include "main.hh"
  20 #include "lily-guile.hh"
  21 #include "stencil.hh"
  22 #include "lookup.hh"
  23 #include "font-metric.hh"
  24 #include "interval.hh"
  25
  26 Stencil
  27 Lookup::dot (Offset p, Real radius)
  28 {
  29   SCM at = (scm_list_n (ly_symbol2scm ("dot"),
  30                         scm_make_real (p[X_AXIS]),
  31                         scm_make_real (p[Y_AXIS]),
  32                         scm_make_real (radius),
  33                         SCM_UNDEFINED));
  34   Box box;
  35   box.add_point (p - Offset (radius, radius));
  36   box.add_point (p + Offset (radius, radius));
  37   return Stencil (box, at);
  38 }
  39
  40
  41
  42 /*
  43  * Horizontal Slope:
  44  *
  45  *            /|   ^
  46  *           / |   |
  47  *          /  |   | height
  48  *         /   |   |
  49  *        /    |   v
  50  *       |    /
  51  *       |   /
  52  * (0,0) x  /slope=dy/dx
  53  *       | /
  54  *       |/
  55  *
  56  *       <----->
  57  *        width
  58  */
  59 Stencil
  60 Lookup::beam (Real slope, Real width, Real thick, Real blot)
  61 {
  62   Real height = slope * width;
  63   Real min_y = (0 <? height) - thick/2;
  64   Real max_y = (0 >? height) + thick/2;
  65
  66   Box b (Interval (0, width),
  67          Interval (min_y, max_y));
  68
  69   SCM at = scm_list_n (ly_symbol2scm ("beam"),
  70                     scm_make_real (width),
  71                     scm_make_real (slope),
  72                     scm_make_real (thick),
  73                     scm_make_real (blot),
  74                     SCM_UNDEFINED);
  75   return Stencil (b, at);
  76 }
  77
  78 Stencil
  79 Lookup::dashed_slur (Bezier b, Real thick, Real dash)
  80 {
  81   SCM l = SCM_EOL;
  82
  83   for (int i= 4; i -- ;)
  84     {
  85       l = scm_cons (ly_offset2scm (b.control_[i]), l);
  86     }
  87
  88   SCM at = (scm_list_n (ly_symbol2scm ("dashed-slur"),
  89                                scm_make_real (thick),
  90                                scm_make_real (dash),
  91                                ly_quote_scm (l),
  92                                SCM_UNDEFINED));
  93
  94   Box box (Interval (0,0),Interval (0,0));
  95   return   Stencil (box, at);
  96 }
  97
  98
  99
 100 Stencil
 101 Lookup::horizontal_line (Interval w, Real th)
 102 {
 103   SCM at = scm_list_n (ly_symbol2scm ("horizontal-line"),
 104                        scm_make_real (w[LEFT]),
 105                        scm_make_real (w[RIGHT]),
 106                        scm_make_real (th),
 107                        SCM_UNDEFINED);
 108
 109
 110   Box box ;
 111   box[X_AXIS] = w;
 112   box[Y_AXIS] = Interval (-th/2,th/2);
 113
 114   return Stencil (box, at);
 115 }
 116
 117
 118 Stencil
 119 Lookup::blank (Box b)
 120 {
 121   return Stencil (b, scm_makfrom0str (""));
 122 }
 123
 124 Stencil
 125 Lookup::filled_box (Box b)
 126 {
 127   SCM  at  = (scm_list_n (ly_symbol2scm ("filledbox"),
 128                      scm_make_real (-b[X_AXIS][LEFT]),
 129                      scm_make_real (b[X_AXIS][RIGHT]),
 130                      scm_make_real (-b[Y_AXIS][DOWN]),
 131                      scm_make_real (b[Y_AXIS][UP]),
 132                      SCM_UNDEFINED));
 133
 134   return Stencil (b,at);
 135 }
 136
 137 /*
 138  * round filled box:
 139  *
 140  *   __________________________________
 141  *  /     \  ^           /     \      ^
 142  * |         |blot              |     |
 143  * |       | |dia       |       |     |
 144  * |         |meter             |     |
 145  * |\ _ _ /  v           \ _ _ /|     |
 146  * |                            |     |
 147  * |                            |     | Box
 148  * |                    <------>|     | extent
 149  * |                      blot  |     | (Y_AXIS)
 150  * |                    diameter|     |
 151  * |                            |     |
 152  * |  _ _                  _ _  |     |
 153  * |/     \              /     \|     |
 154  * |                            |     |
 155  * |       |            |       |     |
 156  * |                            |     |
 157  * x\_____/______________\_____/|_____v
 158  * |(0,0)                       |
 159  * |                            |
 160  * |                            |
 161  * |<-------------------------->|
 162  *       Box extent (X_AXIS)
 163  */
 164 Stencil
 165 Lookup::round_filled_box (Box b, Real blotdiameter)
 166 {
 167   if (b.x ().length () < blotdiameter)
 168     {
 169       programming_error (_f ("round filled box horizontal extent smaller than blot; decreasing blot"));
 170       blotdiameter = b.x ().length ();
 171     }
 172   if (b.y ().length () < blotdiameter)
 173     {
 174       programming_error (_f ("round filled box vertical extent smaller than blot; decreasing blot"));
 175       blotdiameter = b.y ().length ();
 176     }
 177
 178   SCM at = (scm_list_n (ly_symbol2scm ("round-filled-box"),
 179                         scm_make_real (-b[X_AXIS][LEFT]),
 180                         scm_make_real (b[X_AXIS][RIGHT]),
 181                         scm_make_real (-b[Y_AXIS][DOWN]),
 182                         scm_make_real (b[Y_AXIS][UP]),
 183                         scm_make_real (blotdiameter),
 184                         SCM_UNDEFINED));
 185
 186   return Stencil (b,at);
 187 }
 188
 189
 190
 191 /*
 192  * Create Stencil that represents a filled polygon with round edges.
 193  *
 194  * LIMITATIONS:
 195  *
 196  * (a) Only outer (convex) edges are rounded.
 197  *
 198  * (b) This algorithm works as expected only for polygons whose edges
 199  * do not intersect.  For example, the polygon ((0, 0), (q, 0), (0,
 200  * q), (q, q)) has an intersection at point (q/2, q/2) and therefore
 201  * will give a strange result.  Even non-adjacent edges that just
 202  * touch each other will in general not work as expected for non-null
 203  * blotdiameter.
 204  *
 205  * (c) Given a polygon ((x0, y0), (x1, y1), ... , (x (n-1), y (n-1))),
 206  * if there is a natural number k such that blotdiameter is greater
 207  * than the maximum of { | (x (k mod n), y (k mod n)) - (x ((k+1) mod n),
 208  * y ((k+1) mod n)) |, | (x (k mod n), y (k mod n)) - (x ((k+2) mod n),
 209  * y ((k+2) mod n)) |, | (x ((k+1) mod n), y ((k+1) mod n)) - (x ((k+2)
 210  * mod n), y ((k+2) mod n)) | }, then the outline of the rounded
 211  * polygon will exceed the outline of the core polygon.  In other
 212  * words: Do not draw rounded polygons that have a leg smaller or
 213  * thinner than blotdiameter (or set blotdiameter to a sufficiently
 214  * small value -- maybe even 0.0)!
 215  *
 216  * NOTE: Limitations (b) and (c) arise from the fact that round edges
 217  * are made by moulding sharp edges to round ones rather than adding
 218  * to a core filled polygon.  For details of these two different
 219  * approaches, see the thread upon the ledger lines patch that started
 220  * on March 25, 2002 on the devel mailing list.  The below version of
 221  * round_filled_polygon () sticks to the moulding model, which the
 222  * majority of the list participants finally voted for.  This,
 223  * however, results in the above limitations and a much increased
 224  * complexity of the algorithm, since it has to compute a shrinked
 225  * polygon -- which is not trivial define precisely and unambigously.
 226  * With the other approach, one simply could move a circle of size
 227  * blotdiameter along all edges of the polygon (which is what the
 228  * postscript routine in the backend effectively does, but on the
 229  * shrinked polygon). --jr
 230  */
 231 Stencil
 232 Lookup::round_filled_polygon (Array<Offset> points, Real blotdiameter)
 233 {
 234   /* TODO: Maybe print a warning if one of the above limitations
 235      applies to the given polygon.  However, this is quite complicated
 236      to check. */
 237
 238   /* remove consecutive duplicate points */
 239   const Real epsilon = 0.01;
 240   for (int i = 0; i < points.size ();)
 241     {
 242       int next_i = (i + 1) % points.size ();
 243       Real d = (points[i] - points[next_i]).length ();
 244       if (d < epsilon)
 245         points.del (next_i);
 246       else
 247         i++;
 248     }
 249
 250   /* special cases: degenerated polygons */
 251   if (points.size () == 0)
 252     return Stencil ();
 253   if (points.size () == 1)
 254     return dot (points[0], 0.5 * blotdiameter);
 255   if (points.size () == 2)
 256     return Line_interface::make_line (blotdiameter, points[0], points[1]);
 257
 258   /* shrink polygon in size by 0.5 * blotdiameter */
 259   Array<Offset> shrinked_points;
 260   shrinked_points.set_size (points.size ());
 261   bool ccw = 1; // true, if three adjacent points are counterclockwise ordered
 262   for (int i = 0; i < points.size (); i++)
 263     {
 264       int i0 = i;
 265       int i1 = (i + 1) % points.size ();
 266       int i2 = (i + 2) % points.size ();
 267       Offset p0 = points[i0];
 268       Offset p1 = points[i1];
 269       Offset p2 = points[i2];
 270       Offset p10 = p0 - p1;
 271       Offset p12 = p2 - p1;
 272       if (p10.length () != 0.0)
 273         { // recompute ccw
 274           Real phi = p10.arg ();
 275           // rotate (p2 - p0) by (-phi)
 276           Offset q = complex_multiply (p2 - p0, complex_exp (Offset (1.0, -phi)));
 277
 278           if (q[Y_AXIS] > 0)
 279             ccw = 1;
 280           else if (q[Y_AXIS] < 0)
 281             ccw = 0;
 282           else {} // keep ccw unchanged
 283         }
 284       else {} // keep ccw unchanged
 285       Offset p10n = (1.0 / p10.length ()) * p10; // normalize length to 1.0
 286       Offset p12n = (1.0 / p12.length ()) * p12;
 287       Offset p13n = 0.5 * (p10n + p12n);
 288       Offset p14n = 0.5 * (p10n - p12n);
 289       Offset p13;
 290       Real d = p13n.length () * p14n.length (); // distance p3n to line (p1..p0)
 291       if (d < epsilon)
 292         // special case: p0, p1, p2 are on a single line => build
 293         // vector orthogonal to (p2-p0) of length 0.5 blotdiameter
 294         {
 295           p13[X_AXIS] = p10[Y_AXIS];
 296           p13[Y_AXIS] = -p10[X_AXIS];
 297           p13 = (0.5 * blotdiameter / p13.length ()) * p13;
 298         }
 299       else
 300         p13 = (0.5 * blotdiameter / d) * p13n;
 301       shrinked_points[i1] = p1 + ((ccw) ? p13 : -p13);
 302     }
 303
 304   /* build scm expression and bounding box */
 305   SCM shrinked_points_scm = SCM_EOL;
 306   Box box;
 307   for (int i = 0; i < shrinked_points.size (); i++)
 308     {
 309       SCM x = scm_make_real (shrinked_points[i][X_AXIS]);
 310       SCM y = scm_make_real (shrinked_points[i][Y_AXIS]);
 311       shrinked_points_scm = scm_cons (x, scm_cons (y, shrinked_points_scm));
 312       box.add_point (points[i]);
 313     }
 314   SCM polygon_scm = scm_list_n (ly_symbol2scm ("polygon"),
 315                                 ly_quote_scm (shrinked_points_scm),
 316                                 scm_make_real (blotdiameter),
 317                                 SCM_UNDEFINED);
 318
 319   Stencil polygon = Stencil (box, polygon_scm);
 320   shrinked_points.clear ();
 321   return polygon;
 322 }
 323
 324
 325 /*
 326   TODO: deprecate?
 327  */
 328 Stencil
 329 Lookup::frame (Box b, Real thick, Real blot)
 330 {
 331   Stencil 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_stencil (round_filled_box (edges, blot));
 344         }
 345       while (flip (&d) != LEFT);
 346     }
 347   return m;
 348 }
 349
 350 /*
 351   Make a smooth curve along the points
 352  */
 353 Stencil
 354 Lookup::slur (Bezier curve, Real curvethick, Real linethick)
 355 {
 356   Real alpha = (curve.control_[3] - curve.control_[0]).arg ();
 357   Bezier back = curve;
 358   Offset perp = curvethick * complex_exp (Offset (0, alpha + M_PI/2)) * 0.5;
 359   back.reverse ();
 360   back.control_[1] += perp;
 361   back.control_[2] += perp;
 362
 363   curve.control_[1] -= perp;
 364   curve.control_[2] -= perp;
 365
 366   SCM scontrols[8];
 367
 368   for (int i=4; i--;)
 369     scontrols[ i ] = ly_offset2scm (back.control_[i]);
 370   for (int i=4 ; i--;)
 371     scontrols[i+4] = ly_offset2scm (curve.control_[i]);
 372
 373   /*
 374     Need the weird order b.o. the way PS want its arguments
 375    */
 376   int indices[]= {5, 6, 7, 4, 1, 2, 3, 0};
 377   SCM list = SCM_EOL;
 378   for (int i= 8; i--;)
 379     {
 380       list = scm_cons (scontrols[indices[i]], list);
 381     }
 382
 383
 384   SCM at = (scm_list_n (ly_symbol2scm ("bezier-sandwich"),
 385                      ly_quote_scm (list),
 386                      scm_make_real (linethick),
 387                      SCM_UNDEFINED));
 388   Box b (curve.extent (X_AXIS),
 389         curve.extent (Y_AXIS));
 390
 391   b[X_AXIS].unite (back.extent (X_AXIS));
 392   b[Y_AXIS].unite (back.extent (Y_AXIS));
 393
 394   return Stencil (b, at);
 395 }
 396
 397 /*
 398  * Bezier Sandwich:
 399  *
 400  *                               .|
 401  *                        .       |
 402  *              top .             |
 403  *              . curve           |
 404  *          .                     |
 405  *       .                        |
 406  *     .                          |
 407  *    |                           |
 408  *    |                          .|
 409  *    |                     .
 410  *    |         bottom .
 411  *    |            . curve
 412  *    |         .
 413  *    |      .
 414  *    |   .
 415  *    | .
 416  *    |.
 417  *    |
 418  *
 419  */
 420 Stencil
 421 Lookup::bezier_sandwich (Bezier top_curve, Bezier bottom_curve)
 422 {
 423   /*
 424     Need the weird order b.o. the way PS want its arguments
 425    */
 426   SCM list = SCM_EOL;
 427   list = scm_cons (ly_offset2scm (bottom_curve.control_[3]), list);
 428   list = scm_cons (ly_offset2scm (bottom_curve.control_[0]), list);
 429   list = scm_cons (ly_offset2scm (bottom_curve.control_[1]), list);
 430   list = scm_cons (ly_offset2scm (bottom_curve.control_[2]), list);
 431   list = scm_cons (ly_offset2scm (top_curve.control_[0]), list);
 432   list = scm_cons (ly_offset2scm (top_curve.control_[3]), list);
 433   list = scm_cons (ly_offset2scm (top_curve.control_[2]), list);
 434   list = scm_cons (ly_offset2scm (top_curve.control_[1]), list);
 435
 436   SCM horizontal_bend = scm_list_n (ly_symbol2scm ("bezier-sandwich"),
 437                                     ly_quote_scm (list),
 438                                     scm_make_real (0.0),
 439                                     SCM_UNDEFINED);
 440
 441   Interval x_extent = top_curve.extent (X_AXIS);
 442   x_extent.unite (bottom_curve.extent (X_AXIS));
 443   Interval y_extent = top_curve.extent (Y_AXIS);
 444   y_extent.unite (bottom_curve.extent (Y_AXIS));
 445   Box b (x_extent, y_extent);
 446
 447   return Stencil (b, horizontal_bend);
 448 }
 449
 450 /*
 451   TODO: junk me.
 452  */
 453 Stencil
 454 Lookup::accordion (SCM s, Real staff_space, Font_metric *fm)
 455 {
 456   Stencil m;
 457   String sym = ly_scm2string (ly_car (s));
 458   String reg = ly_scm2string (ly_car (ly_cdr (s)));
 459
 460   if (sym == "Discant")
 461     {
 462       Stencil r = fm->find_by_name ("accordion-accDiscant");
 463       m.add_stencil (r);
 464       if (reg.left_string (1) == "F")
 465         {
 466           Stencil d = fm->find_by_name ("accordion-accDot");
 467           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 468           m.add_stencil (d);
 469           reg = reg.right_string (reg.length ()-1);
 470         }
 471       int eflag = 0x00;
 472       if (reg.left_string (3) == "EEE")
 473         {
 474           eflag = 0x07;
 475           reg = reg.right_string (reg.length ()-3);
 476         }
 477       else if (reg.left_string (2) == "EE")
 478         {
 479           eflag = 0x05;
 480           reg = reg.right_string (reg.length ()-2);
 481         }
 482       else if (reg.left_string (2) == "Eh")
 483         {
 484           eflag = 0x04;
 485           reg = reg.right_string (reg.length ()-2);
 486         }
 487       else if (reg.left_string (1) == "E")
 488         {
 489           eflag = 0x02;
 490           reg = reg.right_string (reg.length ()-1);
 491         }
 492       if (eflag & 0x02)
 493         {
 494           Stencil d = fm->find_by_name ("accordion-accDot");
 495           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 496           m.add_stencil (d);
 497         }
 498       if (eflag & 0x04)
 499         {
 500           Stencil d = fm->find_by_name ("accordion-accDot");
 501           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 502           d.translate_axis (0.8 * staff_space PT, X_AXIS);
 503           m.add_stencil (d);
 504         }
 505       if (eflag & 0x01)
 506         {
 507           Stencil d = fm->find_by_name ("accordion-accDot");
 508           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 509           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 510           m.add_stencil (d);
 511         }
 512       if (reg.left_string (2) == "SS")
 513         {
 514           Stencil d = fm->find_by_name ("accordion-accDot");
 515           d.translate_axis (0.5 * staff_space PT, Y_AXIS);
 516           d.translate_axis (0.4 * staff_space PT, X_AXIS);
 517           m.add_stencil (d);
 518           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 519           m.add_stencil (d);
 520           reg = reg.right_string (reg.length ()-2);
 521         }
 522       if (reg.left_string (1) == "S")
 523         {
 524           Stencil d = fm->find_by_name ("accordion-accDot");
 525           d.translate_axis (0.5 * staff_space PT, Y_AXIS);
 526           m.add_stencil (d);
 527           reg = reg.right_string (reg.length ()-1);
 528         }
 529     }
 530   else if (sym == "Freebase")
 531     {
 532       Stencil r = fm->find_by_name ("accordion-accFreebase");
 533       m.add_stencil (r);
 534       if (reg.left_string (1) == "F")
 535         {
 536           Stencil d = fm->find_by_name ("accordion-accDot");
 537           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 538           m.add_stencil (d);
 539           reg = reg.right_string (reg.length ()-1);
 540         }
 541       if (reg == "E")
 542         {
 543           Stencil d = fm->find_by_name ("accordion-accDot");
 544           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 545           m.add_stencil (d);
 546         }
 547     }
 548   else if (sym == "Bayanbase")
 549     {
 550       Stencil r = fm->find_by_name ("accordion-accBayanbase");
 551       m.add_stencil (r);
 552       if (reg.left_string (1) == "T")
 553         {
 554           Stencil d = fm->find_by_name ("accordion-accDot");
 555           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 556           m.add_stencil (d);
 557           reg = reg.right_string (reg.length ()-1);
 558         }
 559       /* include 4' reed just for completeness. You don't want to use this. */
 560       if (reg.left_string (1) == "F")
 561         {
 562           Stencil d = fm->find_by_name ("accordion-accDot");
 563           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 564           m.add_stencil (d);
 565           reg = reg.right_string (reg.length ()-1);
 566         }
 567       if (reg.left_string (2) == "EE")
 568         {
 569           Stencil d = fm->find_by_name ("accordion-accDot");
 570           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 571           d.translate_axis (0.4 * staff_space PT, X_AXIS);
 572           m.add_stencil (d);
 573           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 574           m.add_stencil (d);
 575           reg = reg.right_string (reg.length ()-2);
 576         }
 577       if (reg.left_string (1) == "E")
 578         {
 579           Stencil d = fm->find_by_name ("accordion-accDot");
 580           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 581           m.add_stencil (d);
 582           reg = reg.right_string (reg.length ()-1);
 583         }
 584     }
 585   else if (sym == "Stdbase")
 586     {
 587       Stencil r = fm->find_by_name ("accordion-accStdbase");
 588       m.add_stencil (r);
 589       if (reg.left_string (1) == "T")
 590         {
 591           Stencil d = fm->find_by_name ("accordion-accDot");
 592           d.translate_axis (staff_space * 3.5 PT, Y_AXIS);
 593           m.add_stencil (d);
 594           reg = reg.right_string (reg.length ()-1);
 595         }
 596       if (reg.left_string (1) == "F")
 597         {
 598           Stencil d = fm->find_by_name ("accordion-accDot");
 599           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 600           m.add_stencil (d);
 601           reg = reg.right_string (reg.length ()-1);
 602         }
 603       if (reg.left_string (1) == "M")
 604         {
 605           Stencil d = fm->find_by_name ("accordion-accDot");
 606           d.translate_axis (staff_space * 2 PT, Y_AXIS);
 607           d.translate_axis (staff_space PT, X_AXIS);
 608           m.add_stencil (d);
 609           reg = reg.right_string (reg.length ()-1);
 610         }
 611       if (reg.left_string (1) == "E")
 612         {
 613           Stencil d = fm->find_by_name ("accordion-accDot");
 614           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 615           m.add_stencil (d);
 616           reg = reg.right_string (reg.length ()-1);
 617         }
 618       if (reg.left_string (1) == "S")
 619         {
 620           Stencil d = fm->find_by_name ("accordion-accDot");
 621           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 622           m.add_stencil (d);
 623           reg = reg.right_string (reg.length ()-1);
 624         }
 625     }
 626   /* ugh maybe try to use regular font for S.B. and B.B and only use one font
 627      for the rectangle */
 628   else if (sym == "SB")
 629     {
 630       Stencil r = fm->find_by_name ("accordion-accSB");
 631       m.add_stencil (r);
 632     }
 633   else if (sym == "BB")
 634     {
 635       Stencil r = fm->find_by_name ("accordion-accBB");
 636       m.add_stencil (r);
 637     }
 638   else if (sym == "OldEE")
 639     {
 640       Stencil r = fm->find_by_name ("accordion-accOldEE");
 641       m.add_stencil (r);
 642     }
 643   else if (sym == "OldEES")
 644     {
 645       Stencil r = fm->find_by_name ("accordion-accOldEES");
 646       m.add_stencil (r);
 647     }
 648   return m;
 649 }
 650
 651 Stencil
 652 Lookup::repeat_slash (Real w, Real s, Real t)
 653 {
 654   SCM wid = scm_make_real (w);
 655   SCM sl = scm_make_real (s);
 656   SCM thick = scm_make_real (t);
 657   SCM slashnodot = scm_list_n (ly_symbol2scm ("repeat-slash"),
 658                             wid, sl, thick, SCM_UNDEFINED);
 659
 660   Box b (Interval (0, w + sqrt (sqr (t/s) + sqr (t))),
 661          Interval (0, w * s));
 662
 663   return Stencil (b, slashnodot); //  http://slashnodot.org
 664 }
 665
 666
 667 Stencil
 668 Lookup::bracket (Axis a, Interval iv, Real thick, Real protude, Real blot)
 669 {
 670   Box b;
 671   Axis other = Axis ((a+1)%2);
 672   b[a] = iv;
 673   b[other] = Interval (-1, 1) * thick * 0.5;
 674
 675   Stencil m =  round_filled_box (b, blot);
 676
 677   b[a] = Interval (iv[UP] - thick, iv[UP]);
 678   Interval oi = Interval (-thick/2, thick/2 + fabs (protude)) ;
 679   oi *=  sign (protude);
 680   b[other] = oi;
 681   m.add_stencil (round_filled_box (b, blot));
 682   b[a] = Interval (iv[DOWN], iv[DOWN]  +thick);
 683   m.add_stencil (round_filled_box (b,blot));
 684
 685   return m;
 686 }
 687
 688 Stencil
 689 Lookup::triangle (Interval iv, Real thick, Real protude)
 690 {
 691   Box b ;
 692   b[X_AXIS] = iv;
 693   b[Y_AXIS] = Interval (0 <? protude , 0 >? protude);
 694
 695   SCM s = scm_list_n (ly_symbol2scm ("symmetric-x-triangle"),
 696                       scm_make_real (thick),
 697                       scm_make_real (iv.length ()),
 698                       scm_make_real (protude), SCM_UNDEFINED);
 699
 700   return Stencil (b, s);
 701 }
 702
 703
 704 LY_DEFINE (ly_bracket ,"ly:bracket",
 705           4, 0, 0,
 706           (SCM a, SCM iv, SCM t, SCM p),
 707           "Make a bracket in direction @var{a}. The extent of the bracket is "
 708           "given by @var{iv}. The wings protude by an amount of @var{p}, which "
 709           "may be negative. The thickness is given by @var{t}.")
 710 {
 711   SCM_ASSERT_TYPE (is_axis (a), a, SCM_ARG1, __FUNCTION__, "axis") ;
 712   SCM_ASSERT_TYPE (is_number_pair (iv), iv, SCM_ARG2, __FUNCTION__, "number pair") ;
 713   SCM_ASSERT_TYPE (ly_number_p (t), a, SCM_ARG3, __FUNCTION__, "number") ;
 714   SCM_ASSERT_TYPE (ly_number_p (p), a, SCM_ARG4, __FUNCTION__, "number") ;
 715
 716
 717   return Lookup::bracket ((Axis)ly_scm2int (a), ly_scm2interval (iv),
 718                           ly_scm2double (t),
 719                           ly_scm2double (p),
 720                           0.95 * ly_scm2double (t)).smobbed_copy ();
 721 }
 722
 723
 724
 725 LY_DEFINE (ly_filled_box ,"ly:round-filled-box",
 726           3, 0, 0,
 727           (SCM xext, SCM yext, SCM blot),
 728           "Make a @code{Stencil} "
 729           "that prints a black box of dimensions @var{xext}, "
 730           "@var{yext} and roundness @var{blot}."
 731           )
 732 {
 733   SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG1, __FUNCTION__, "number pair") ;
 734   SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG2, __FUNCTION__, "number pair") ;
 735   SCM_ASSERT_TYPE (ly_number_p (blot), blot, SCM_ARG3, __FUNCTION__, "number") ;
 736
 737   return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)),
 738                                    ly_scm2double (blot)).smobbed_copy ();
 739 }
 740