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--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8   Jan Nieuwenhuizen <janneke@gnu.org>
   9 */
  10
  11 #include "lookup.hh"
  12
  13 #include <cmath>
  14 #include <cctype>
  15 using namespace std;
  16
  17 #include "line-interface.hh"
  18 #include "warn.hh"
  19 #include "dimensions.hh"
  20 #include "bezier.hh"
  21 #include "string-convert.hh"
  22 #include "file-path.hh"
  23 #include "main.hh"
  24 #include "lily-guile.hh"
  25 #include "font-metric.hh"
  26
  27 Stencil
  28 Lookup::dot (Offset p, Real radius)
  29 {
  30   SCM at = (scm_list_n (ly_symbol2scm ("dot"),
  31                         scm_from_double (p[X_AXIS]),
  32                         scm_from_double (p[Y_AXIS]),
  33                         scm_from_double (radius),
  34                         SCM_UNDEFINED));
  35   Box box;
  36   box.add_point (p - Offset (radius, radius));
  37   box.add_point (p + Offset (radius, radius));
  38   return Stencil (box, at);
  39 }
  40
  41 Stencil
  42 Lookup::beam (Real slope, Real width, Real thick, Real blot)
  43 {
  44   Box b;
  45
  46   Offset p;
  47
  48   p = Offset (0, thick / 2);
  49   b.add_point (p);
  50   p += Offset (1, -1) * (blot / 2);
  51
  52   SCM points = SCM_EOL;
  53
  54   points = scm_cons (scm_from_double (p[X_AXIS]),
  55                      scm_cons (scm_from_double (p[Y_AXIS]),
  56                                points));
  57
  58   p = Offset (0, -thick / 2);
  59   b.add_point (p);
  60   p += Offset (1, 1) * (blot / 2);
  61
  62   points = scm_cons (scm_from_double (p[X_AXIS]),
  63                      scm_cons (scm_from_double (p[Y_AXIS]),
  64                                points));
  65
  66   p = Offset (width, width * slope - thick / 2);
  67   b.add_point (p);
  68   p += Offset (-1, 1) * (blot / 2);
  69
  70   points = scm_cons (scm_from_double (p[X_AXIS]),
  71                      scm_cons (scm_from_double (p[Y_AXIS]),
  72                                points));
  73
  74   p = Offset (width, width * slope + thick / 2);
  75   b.add_point (p);
  76   p += Offset (-1, -1) * (blot / 2);
  77
  78   points = scm_cons (scm_from_double (p[X_AXIS]),
  79                      scm_cons (scm_from_double (p[Y_AXIS]),
  80                                points));
  81
  82   SCM expr = scm_list_n (ly_symbol2scm ("polygon"),
  83                          ly_quote_scm (points),
  84                          scm_from_double (blot),
  85                          SCM_BOOL_T,
  86                          SCM_UNDEFINED);
  87
  88   return Stencil (b, expr);
  89 }
  90
  91 Stencil
  92 Lookup::dashed_slur (Bezier b, Real thick, Real dash_period, Real dash_fraction)
  93 {
  94   SCM l = SCM_EOL;
  95
  96   Real on = dash_fraction * dash_period;
  97   Real off = dash_period - on;
  98
  99   for (int i = 4; i--;)
 100     l = scm_cons (ly_offset2scm (b.control_[i]), l);
 101
 102   SCM at = (scm_list_n (ly_symbol2scm ("dashed-slur"),
 103                         scm_from_double (thick),
 104                         scm_from_double (on),
 105                         scm_from_double (off),
 106                         ly_quote_scm (l),
 107                         SCM_UNDEFINED));
 108
 109   Box box (b.extent (X_AXIS), b.extent (Y_AXIS));
 110   return Stencil (box, at);
 111 }
 112
 113 Stencil
 114 Lookup::rotated_box (Real slope, Real width, Real thick, Real blot)
 115 {
 116   vector<Offset> pts;
 117   Offset rot (1, slope);
 118
 119   thick -= 2*blot;
 120   width -= 2*blot;
 121   rot /= sqrt (1 + slope*slope);
 122   pts.push_back (Offset (0, -thick / 2) * rot);
 123   pts.push_back (Offset (width, -thick / 2) * rot);
 124   pts.push_back (Offset (width, thick / 2) * rot);
 125   pts.push_back (Offset (0, thick / 2) * rot);
 126   return Lookup::round_filled_polygon (pts, blot);
 127 }
 128
 129 Stencil
 130 Lookup::horizontal_line (Interval w, Real th)
 131 {
 132   SCM at = scm_list_n (ly_symbol2scm ("draw-line"),
 133                        scm_from_double (th),
 134                        scm_from_double (w[LEFT]),
 135                        scm_from_double (0),
 136                        scm_from_double (w[RIGHT]),
 137                        scm_from_double (0),
 138                        SCM_UNDEFINED);
 139
 140   Box box;
 141   box[X_AXIS] = w;
 142   box[Y_AXIS] = Interval (-th / 2, th / 2);
 143
 144   return Stencil (box, at);
 145 }
 146
 147 Stencil
 148 Lookup::blank (Box b)
 149 {
 150   return Stencil (b, scm_from_locale_string (""));
 151 }
 152
 153 Stencil
 154 Lookup::filled_box (Box b)
 155 {
 156   return round_filled_box (b, 0.0);
 157 }
 158
 159 /*
 160  * round filled box:
 161  *
 162  *   __________________________________
 163  *  /     \  ^           /     \      ^
 164  * |         |blot              |     |
 165  * |       | |dia       |       |     |
 166  * |         |meter             |     |
 167  * |\ _ _ /  v           \ _ _ /|     |
 168  * |                            |     |
 169  * |                            |     | Box
 170  * |                    <------>|     | extent
 171  * |                      blot  |     | (Y_AXIS)
 172  * |                    diameter|     |
 173  * |                            |     |
 174  * |  _ _                  _ _  |     |
 175  * |/     \              /     \|     |
 176  * |                            |     |
 177  * |       |            |       |     |
 178  * |                            |     |
 179  * x\_____/______________\_____/|_____v
 180  * |(0, 0)                       |
 181  * |                            |
 182  * |                            |
 183  * |<-------------------------->|
 184  *       Box extent (X_AXIS)
 185  */
 186 Stencil
 187 Lookup::round_filled_box (Box b, Real blotdiameter)
 188 {
 189   if (b.x ().length () < blotdiameter)
 190     blotdiameter = b.x ().length ();
 191   if (b.y ().length () < blotdiameter)
 192     blotdiameter = b.y ().length ();
 193
 194   SCM at = (scm_list_n (ly_symbol2scm ("round-filled-box"),
 195                         scm_from_double (-b[X_AXIS][LEFT]),
 196                         scm_from_double (b[X_AXIS][RIGHT]),
 197                         scm_from_double (-b[Y_AXIS][DOWN]),
 198                         scm_from_double (b[Y_AXIS][UP]),
 199                         scm_from_double (blotdiameter),
 200                         SCM_UNDEFINED));
 201
 202   return Stencil (b, at);
 203 }
 204
 205 /*
 206  * Create Stencil that represents a filled polygon with round edges.
 207  *
 208  * LIMITATIONS:
 209  *
 210  * (a) Only outer (convex) edges are rounded.
 211  *
 212  * (b) This algorithm works as expected only for polygons whose edges
 213  * do not intersect.  For example, the polygon ((0, 0), (q, 0), (0,
 214  * q), (q, q)) has an intersection at point (q/2, q/2) and therefore
 215  * will give a strange result.  Even non-adjacent edges that just
 216  * touch each other will in general not work as expected for non-null
 217  * blotdiameter.
 218  *
 219  * (c) Given a polygon ((x0, y0), (x1, y1), ... , (x (n-1), y (n-1))),
 220  * if there is a natural number k such that blotdiameter is greater
 221  * than the maximum of { | (x (k mod n), y (k mod n)) - (x ((k+1) mod n),
 222  * y ((k+1) mod n)) |, | (x (k mod n), y (k mod n)) - (x ((k+2) mod n),
 223  * y ((k+2) mod n)) |, | (x ((k+1) mod n), y ((k+1) mod n)) - (x ((k+2)
 224  * mod n), y ((k+2) mod n)) | }, then the outline of the rounded
 225  * polygon will exceed the outline of the core polygon.  In other
 226  * words: Do not draw rounded polygons that have a leg smaller or
 227  * thinner than blotdiameter (or set blotdiameter to a sufficiently
 228  * small value -- maybe even 0.0)!
 229  *
 230  * NOTE: Limitations (b) and (c) arise from the fact that round edges
 231  * are made by moulding sharp edges to round ones rather than adding
 232  * to a core filled polygon.  For details of these two different
 233  * approaches, see the thread upon the ledger lines patch that started
 234  * on March 25, 2002 on the devel mailing list.  The below version of
 235  * round_filled_polygon () sticks to the moulding model, which the
 236  * majority of the list participants finally voted for.  This,
 237  * however, results in the above limitations and a much increased
 238  * complexity of the algorithm, since it has to compute a shrinked
 239  * polygon -- which is not trivial define precisely and unambigously.
 240  * With the other approach, one simply could move a circle of size
 241  * blotdiameter along all edges of the polygon (which is what the
 242  * postscript routine in the backend effectively does, but on the
 243  * shrinked polygon). --jr
 244  */
 245 Stencil
 246 Lookup::round_filled_polygon (vector<Offset> const &points,
 247                               Real blotdiameter)
 248 {
 249   /* TODO: Maybe print a warning if one of the above limitations
 250      applies to the given polygon.  However, this is quite complicated
 251      to check. */
 252
 253   const Real epsilon = 0.01;
 254
 255 #ifndef NDEBUG
 256   /* remove consecutive duplicate points */
 257   for (vsize i = 0; i < points.size (); i++)
 258     {
 259       int next = (i + 1) % points.size ();
 260       Real d = (points[i] - points[next]).length ();
 261       if (d < epsilon)
 262         programming_error ("Polygon should not have duplicate points");
 263     }
 264 #endif
 265
 266   /* special cases: degenerated polygons */
 267   if (points.size () == 0)
 268     return Stencil ();
 269   if (points.size () == 1)
 270     return dot (points[0], 0.5 * blotdiameter);
 271   if (points.size () == 2)
 272     return Line_interface::make_line (blotdiameter, points[0], points[1]);
 273
 274   /* shrink polygon in size by 0.5 * blotdiameter */
 275   vector<Offset> shrunk_points;
 276   shrunk_points.resize (points.size ());
 277   bool ccw = 1; // true, if three adjacent points are counterclockwise ordered
 278   for (vsize i = 0; i < points.size (); i++)
 279     {
 280       int i0 = i;
 281       int i1 = (i + 1) % points.size ();
 282       int i2 = (i + 2) % points.size ();
 283       Offset p0 = points[i0];
 284       Offset p1 = points[i1];
 285       Offset p2 = points[i2];
 286       Offset p10 = p0 - p1;
 287       Offset p12 = p2 - p1;
 288       if (p10.length () != 0.0)
 289         { // recompute ccw
 290           Real phi = p10.arg ();
 291           // rotate (p2 - p0) by (-phi)
 292           Offset q = complex_multiply (p2 - p0, complex_exp (Offset (1.0, -phi)));
 293
 294           if (q[Y_AXIS] > 0)
 295             ccw = 1;
 296           else if (q[Y_AXIS] < 0)
 297             ccw = 0;
 298           else {} // keep ccw unchanged
 299         }
 300       else {} // keep ccw unchanged
 301       Offset p10n = (1.0 / p10.length ()) * p10; // normalize length to 1.0
 302       Offset p12n = (1.0 / p12.length ()) * p12;
 303       Offset p13n = 0.5 * (p10n + p12n);
 304       Offset p14n = 0.5 * (p10n - p12n);
 305       Offset p13;
 306       Real d = p13n.length () * p14n.length (); // distance p3n to line (p1..p0)
 307       if (d < epsilon)
 308         // special case: p0, p1, p2 are on a single line => build
 309         // vector orthogonal to (p2-p0) of length 0.5 blotdiameter
 310         {
 311           p13[X_AXIS] = p10[Y_AXIS];
 312           p13[Y_AXIS] = -p10[X_AXIS];
 313           p13 = (0.5 * blotdiameter / p13.length ()) * p13;
 314         }
 315       else
 316         p13 = (0.5 * blotdiameter / d) * p13n;
 317       shrunk_points[i1] = p1 + ((ccw) ? p13 : -p13);
 318     }
 319
 320   /* build scm expression and bounding box */
 321   SCM shrunk_points_scm = SCM_EOL;
 322   Box box;
 323   for (vsize i = 0; i < shrunk_points.size (); i++)
 324     {
 325       SCM x = scm_from_double (shrunk_points[i][X_AXIS]);
 326       SCM y = scm_from_double (shrunk_points[i][Y_AXIS]);
 327       shrunk_points_scm = scm_cons (x, scm_cons (y, shrunk_points_scm));
 328       box.add_point (points[i]);
 329     }
 330   SCM polygon_scm = scm_list_n (ly_symbol2scm ("polygon"),
 331                                 ly_quote_scm (shrunk_points_scm),
 332                                 scm_from_double (blotdiameter),
 333                                 SCM_BOOL_T,
 334                                 SCM_UNDEFINED);
 335
 336   Stencil polygon = Stencil (box, polygon_scm);
 337   shrunk_points.clear ();
 338   return polygon;
 339 }
 340
 341 /*
 342   TODO: deprecate?
 343 */
 344 Stencil
 345 Lookup::frame (Box b, Real thick, Real blot)
 346 {
 347   Stencil m;
 348   Direction d = LEFT;
 349   for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
 350     {
 351       Axis o = Axis ((a + 1)%NO_AXES);
 352       do
 353         {
 354           Box edges;
 355           edges[a] = b[a][d] + 0.5 * thick * Interval (-1, 1);
 356           edges[o][DOWN] = b[o][DOWN] - thick / 2;
 357           edges[o][UP] = b[o][UP] + thick / 2;
 358
 359           m.add_stencil (round_filled_box (edges, blot));
 360         }
 361       while (flip (&d) != LEFT);
 362     }
 363   return m;
 364 }
 365
 366 /*
 367   Make a smooth curve along the points
 368 */
 369 Stencil
 370 Lookup::slur (Bezier curve, Real curvethick, Real linethick)
 371 {
 372   Real alpha = (curve.control_[3] - curve.control_[0]).arg ();
 373   Bezier back = curve;
 374   Offset perp = curvethick * complex_exp (Offset (0, alpha + M_PI / 2)) * 0.5;
 375   back.reverse ();
 376   back.control_[1] += perp;
 377   back.control_[2] += perp;
 378
 379   curve.control_[1] -= perp;
 380   curve.control_[2] -= perp;
 381
 382   SCM scontrols[8];
 383
 384   for (int i = 0; i < 4; i++)
 385     scontrols[i] = ly_offset2scm (back.control_[i]);
 386   for (int i = 0; i < 4; i++)
 387     scontrols[i + 4] = ly_offset2scm (curve.control_[i]);
 388
 389   /*
 390     Need the weird order b.o. the way PS want its arguments
 391   */
 392   int indices[] = {5, 6, 7, 4, 1, 2, 3, 0};
 393   SCM list = SCM_EOL;
 394   for (int i = 8; i--;)
 395     list = scm_cons (scontrols[indices[i]], list);
 396
 397   SCM at = (scm_list_n (ly_symbol2scm ("bezier-sandwich"),
 398                         ly_quote_scm (list),
 399                         scm_from_double (linethick),
 400                         SCM_UNDEFINED));
 401   Box b (curve.extent (X_AXIS),
 402          curve.extent (Y_AXIS));
 403
 404   b[X_AXIS].unite (back.extent (X_AXIS));
 405   b[Y_AXIS].unite (back.extent (Y_AXIS));
 406
 407   b.widen (0.5 * linethick, 0.5 * linethick);
 408   return Stencil (b, at);
 409 }
 410
 411 /*
 412  * Bezier Sandwich:
 413  *
 414  *                               .|
 415  *                        .       |
 416  *              top .             |
 417  *              . curve           |
 418  *          .                     |
 419  *       .                        |
 420  *     .                          |
 421  *    |                           |
 422  *    |                          .|
 423  *    |                     .
 424  *    |         bottom .
 425  *    |            . curve
 426  *    |         .
 427  *    |      .
 428  *    |   .
 429  *    | .
 430  *    |.
 431  *    |
 432  *
 433  */
 434 Stencil
 435 Lookup::bezier_sandwich (Bezier top_curve, Bezier bottom_curve)
 436 {
 437   /*
 438     Need the weird order b.o. the way PS want its arguments
 439   */
 440   SCM list = SCM_EOL;
 441   list = scm_cons (ly_offset2scm (bottom_curve.control_[3]), list);
 442   list = scm_cons (ly_offset2scm (bottom_curve.control_[0]), list);
 443   list = scm_cons (ly_offset2scm (bottom_curve.control_[1]), list);
 444   list = scm_cons (ly_offset2scm (bottom_curve.control_[2]), list);
 445   list = scm_cons (ly_offset2scm (top_curve.control_[0]), list);
 446   list = scm_cons (ly_offset2scm (top_curve.control_[3]), list);
 447   list = scm_cons (ly_offset2scm (top_curve.control_[2]), list);
 448   list = scm_cons (ly_offset2scm (top_curve.control_[1]), list);
 449
 450   SCM horizontal_bend = scm_list_n (ly_symbol2scm ("bezier-sandwich"),
 451                                     ly_quote_scm (list),
 452                                     scm_from_double (0.0),
 453                                     SCM_UNDEFINED);
 454
 455   Interval x_extent = top_curve.extent (X_AXIS);
 456   x_extent.unite (bottom_curve.extent (X_AXIS));
 457   Interval y_extent = top_curve.extent (Y_AXIS);
 458   y_extent.unite (bottom_curve.extent (Y_AXIS));
 459   Box b (x_extent, y_extent);
 460
 461   return Stencil (b, horizontal_bend);
 462 }
 463
 464 /*
 465   TODO: junk me.
 466 */
 467 Stencil
 468 Lookup::accordion (SCM s, Real staff_space, Font_metric *fm)
 469 {
 470   Stencil m;
 471   string sym = ly_scm2string (scm_car (s));
 472   string reg = ly_scm2string (scm_car (scm_cdr (s)));
 473
 474   if (sym == "Discant")
 475     {
 476       Stencil r = fm->find_by_name ("accordion.accDiscant");
 477       m.add_stencil (r);
 478       if (reg.substr (0, 1) == "F")
 479         {
 480           Stencil d = fm->find_by_name ("accordion.accDot");
 481           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 482           m.add_stencil (d);
 483           reg = reg.substr (1);
 484         }
 485       int eflag = 0x00;
 486       if (reg.substr (0, 3) == "EEE")
 487         {
 488           eflag = 0x07;
 489           reg = reg.substr (3);
 490         }
 491       else if (reg.substr (0, 2) == "EE")
 492         {
 493           eflag = 0x05;
 494           reg = reg.substr (2);
 495         }
 496       else if (reg.substr (0, 2) == "Eh")
 497         {
 498           eflag = 0x04;
 499           reg = reg.substr (2);
 500         }
 501       else if (reg.substr (0, 1) == "E")
 502         {
 503           eflag = 0x02;
 504           reg = reg.substr (1);
 505         }
 506       if (eflag & 0x02)
 507         {
 508           Stencil d = fm->find_by_name ("accordion.accDot");
 509           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 510           m.add_stencil (d);
 511         }
 512       if (eflag & 0x04)
 513         {
 514           Stencil d = fm->find_by_name ("accordion.accDot");
 515           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 516           d.translate_axis (0.8 * staff_space PT, X_AXIS);
 517           m.add_stencil (d);
 518         }
 519       if (eflag & 0x01)
 520         {
 521           Stencil d = fm->find_by_name ("accordion.accDot");
 522           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 523           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 524           m.add_stencil (d);
 525         }
 526       if (reg.substr (0, 2) == "SS")
 527         {
 528           Stencil d = fm->find_by_name ("accordion.accDot");
 529           d.translate_axis (0.5 * staff_space PT, Y_AXIS);
 530           d.translate_axis (0.4 * staff_space PT, X_AXIS);
 531           m.add_stencil (d);
 532           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 533           m.add_stencil (d);
 534           reg = reg.substr (2);
 535         }
 536       if (reg.substr (0, 1) == "S")
 537         {
 538           Stencil d = fm->find_by_name ("accordion.accDot");
 539           d.translate_axis (0.5 * staff_space PT, Y_AXIS);
 540           m.add_stencil (d);
 541           reg = reg.substr (1);
 542         }
 543     }
 544   else if (sym == "Freebase")
 545     {
 546       Stencil r = fm->find_by_name ("accordion.accFreebase");
 547       m.add_stencil (r);
 548       if (reg.substr (0, 1) == "F")
 549         {
 550           Stencil d = fm->find_by_name ("accordion.accDot");
 551           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 552           m.add_stencil (d);
 553           reg = reg.substr (1);
 554         }
 555       if (reg == "E")
 556         {
 557           Stencil d = fm->find_by_name ("accordion.accDot");
 558           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 559           m.add_stencil (d);
 560         }
 561     }
 562   else if (sym == "Bayanbase")
 563     {
 564       Stencil r = fm->find_by_name ("accordion.accBayanbase");
 565       m.add_stencil (r);
 566       if (reg.substr (0, 1) == "T")
 567         {
 568           Stencil d = fm->find_by_name ("accordion.accDot");
 569           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 570           m.add_stencil (d);
 571           reg = reg.substr (1);
 572         }
 573       /* include 4' reed just for completeness. You don't want to use this. */
 574       if (reg.substr (0, 1) == "F")
 575         {
 576           Stencil d = fm->find_by_name ("accordion.accDot");
 577           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 578           m.add_stencil (d);
 579           reg = reg.substr (1);
 580         }
 581       if (reg.substr (0, 2) == "EE")
 582         {
 583           Stencil d = fm->find_by_name ("accordion.accDot");
 584           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 585           d.translate_axis (0.4 * staff_space PT, X_AXIS);
 586           m.add_stencil (d);
 587           d.translate_axis (-0.8 * staff_space PT, X_AXIS);
 588           m.add_stencil (d);
 589           reg = reg.substr (2);
 590         }
 591       if (reg.substr (0, 1) == "E")
 592         {
 593           Stencil d = fm->find_by_name ("accordion.accDot");
 594           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 595           m.add_stencil (d);
 596           reg = reg.substr (1);
 597         }
 598     }
 599   else if (sym == "Stdbase")
 600     {
 601       Stencil r = fm->find_by_name ("accordion.accStdbase");
 602       m.add_stencil (r);
 603       if (reg.substr (0, 1) == "T")
 604         {
 605           Stencil d = fm->find_by_name ("accordion.accDot");
 606           d.translate_axis (staff_space * 3.5 PT, Y_AXIS);
 607           m.add_stencil (d);
 608           reg = reg.substr (1);
 609         }
 610       if (reg.substr (0, 1) == "F")
 611         {
 612           Stencil d = fm->find_by_name ("accordion.accDot");
 613           d.translate_axis (staff_space * 2.5 PT, Y_AXIS);
 614           m.add_stencil (d);
 615           reg = reg.substr (1);
 616         }
 617       if (reg.substr (0, 1) == "M")
 618         {
 619           Stencil d = fm->find_by_name ("accordion.accDot");
 620           d.translate_axis (staff_space * 2 PT, Y_AXIS);
 621           d.translate_axis (staff_space PT, X_AXIS);
 622           m.add_stencil (d);
 623           reg = reg.substr (1);
 624         }
 625       if (reg.substr (0, 1) == "E")
 626         {
 627           Stencil d = fm->find_by_name ("accordion.accDot");
 628           d.translate_axis (staff_space * 1.5 PT, Y_AXIS);
 629           m.add_stencil (d);
 630           reg = reg.substr (1);
 631         }
 632       if (reg.substr (0, 1) == "S")
 633         {
 634           Stencil d = fm->find_by_name ("accordion.accDot");
 635           d.translate_axis (staff_space * 0.5 PT, Y_AXIS);
 636           m.add_stencil (d);
 637           reg = reg.substr (1);
 638         }
 639     }
 640   /* ugh maybe try to use regular font for S.B. and B.B and only use one font
 641      for the rectangle */
 642   else if (sym == "SB")
 643     {
 644       Stencil r = fm->find_by_name ("accordion.accSB");
 645       m.add_stencil (r);
 646     }
 647   else if (sym == "BB")
 648     {
 649       Stencil r = fm->find_by_name ("accordion.accBB");
 650       m.add_stencil (r);
 651     }
 652   else if (sym == "OldEE")
 653     {
 654       Stencil r = fm->find_by_name ("accordion.accOldEE");
 655       m.add_stencil (r);
 656     }
 657   else if (sym == "OldEES")
 658     {
 659       Stencil r = fm->find_by_name ("accordion.accOldEES");
 660       m.add_stencil (r);
 661     }
 662   return m;
 663 }
 664
 665 Stencil
 666 Lookup::repeat_slash (Real w, Real s, Real t)
 667 {
 668 #if 0 /*  TODO */
 669   vector<Offset> points;
 670   Real blotdiameter = 0.0;
 671
 672   Offset p1 (0, 0);
 673   Offset p2 (w, w * s);
 674
 675   return Lookup::round_filled_polygon (points, blotdiameter);
 676 #endif
 677
 678   SCM wid = scm_from_double (w);
 679   SCM sl = scm_from_double (s);
 680   SCM thick = scm_from_double (t);
 681   SCM slashnodot = scm_list_n (ly_symbol2scm ("repeat-slash"),
 682                                wid, sl, thick, SCM_UNDEFINED);
 683
 684   Box b (Interval (0, w + sqrt (sqr (t / s) + sqr (t))),
 685          Interval (0, w * s));
 686
 687   return Stencil (b, slashnodot); //  http://slashnodot.org
 688 }
 689
 690 Stencil
 691 Lookup::bracket (Axis a, Interval iv, Real thick, Real protrude, Real blot)
 692 {
 693   Box b;
 694   Axis other = Axis ((a + 1)%2);
 695   b[a] = iv;
 696   b[other] = Interval (-1, 1) * thick * 0.5;
 697
 698   Stencil m = round_filled_box (b, blot);
 699
 700   b[a] = Interval (iv[UP] - thick, iv[UP]);
 701   Interval oi = Interval (-thick / 2, thick / 2 + fabs (protrude));
 702   oi *= sign (protrude);
 703   b[other] = oi;
 704   m.add_stencil (round_filled_box (b, blot));
 705   b[a] = Interval (iv[DOWN], iv[DOWN] + thick);
 706   m.add_stencil (round_filled_box (b, blot));
 707
 708   return m;
 709 }
 710
 711 Stencil
 712 Lookup::triangle (Interval iv, Real thick, Real protrude)
 713 {
 714   Box b;
 715   b[X_AXIS] = Interval (0, iv.length ());
 716   b[Y_AXIS] = Interval (min (0., protrude), max (0.0, protrude));
 717
 718   vector<Offset> points;
 719   points.push_back (Offset (iv[LEFT], 0));
 720   points.push_back (Offset (iv[RIGHT], 0));
 721   points.push_back (Offset (iv.center (), protrude));
 722
 723   return points_to_line_stencil (thick, points);
 724
 725 }
 726
 727
 728
 729 Stencil
 730 Lookup::points_to_line_stencil (Real thick, vector<Offset> const &points)
 731 {
 732   Stencil ret;
 733   for (vsize i = 1; i < points.size (); i++)
 734     {
 735       if (points[i-1].is_sane () && points[i].is_sane ())
 736         {
 737           Stencil line
 738             = Line_interface::make_line (thick, points[i-1], points[i]);
 739           ret.add_stencil (line);
 740         }
 741     }
 742   return ret;
 743 }