lily/stencil-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20
  21 #include "font-metric.hh"
  22 #include "libc-extension.hh"
  23 #include "lookup.hh"
  24 #include "stencil.hh"
  25
  26 /*
  27   TODO: naming add/combine.
  28 */
  29
  30 LY_DEFINE (ly_stencil_translate_axis, "ly:stencil-translate-axis",
  31            3, 0, 0, (SCM stil, SCM amount, SCM axis),
  32            "Return a copy of @var{stil} but translated by @var{amount}"
  33            " in @var{axis} direction.")
  34 {
  35   Stencil *s = unsmob_stencil (stil);
  36   LY_ASSERT_SMOB (Stencil, stil, 1);
  37   LY_ASSERT_TYPE (scm_is_number, amount, 2);
  38   LY_ASSERT_TYPE (is_axis, axis, 3);
  39
  40   Real real_amount = scm_to_double (amount);
  41
  42   SCM new_s = s->smobbed_copy ();
  43   Stencil *q = unsmob_stencil (new_s);
  44   q->translate_axis (real_amount, Axis (scm_to_int (axis)));
  45   return new_s;
  46 }
  47
  48 LY_DEFINE (ly_stencil_translate, "ly:stencil-translate",
  49            2, 0, 0, (SCM stil, SCM offset),
  50            "Return a @var{stil}, but translated by @var{offset}"
  51            " (a pair of numbers).")
  52 {
  53   Stencil *s = unsmob_stencil (stil);
  54   LY_ASSERT_SMOB (Stencil, stil, 1);
  55   LY_ASSERT_TYPE (is_number_pair, offset, 2);
  56   Offset o = ly_scm2offset (offset);
  57
  58   SCM new_s = s->smobbed_copy ();
  59   Stencil *q = unsmob_stencil (new_s);
  60   q->translate (o);
  61   return new_s;
  62 }
  63
  64 LY_DEFINE (ly_stencil_expr, "ly:stencil-expr",
  65            1, 0, 0, (SCM stil),
  66            "Return the expression of @var{stil}.")
  67 {
  68   Stencil *s = unsmob_stencil (stil);
  69   LY_ASSERT_SMOB (Stencil, stil, 1);
  70   return s->expr ();
  71 }
  72
  73 LY_DEFINE (ly_stencil_extent, "ly:stencil-extent",
  74            2, 0, 0, (SCM stil, SCM axis),
  75            "Return a pair of numbers signifying the extent of @var{stil} in"
  76            " @var{axis} direction (@code{0} or @code{1} for x and"
  77            " y@tie{}axis, respectively).")
  78 {
  79   Stencil *s = unsmob_stencil (stil);
  80   LY_ASSERT_SMOB (Stencil, stil, 1);
  81   LY_ASSERT_TYPE (is_axis, axis, 2);
  82
  83   return ly_interval2scm (s->extent (Axis (scm_to_int (axis))));
  84 }
  85
  86 LY_DEFINE (ly_stencil_empty_p, "ly:stencil-empty?",
  87            1, 0, 0, (SCM stil),
  88            "Return whether @var{stil} is empty.")
  89 {
  90   Stencil *s = unsmob_stencil (stil);
  91   LY_ASSERT_SMOB (Stencil, stil, 1);
  92   return scm_from_bool (s->is_empty ());
  93 }
  94
  95 LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge",
  96            4, 2, 0, (SCM first, SCM axis, SCM direction,
  97                      SCM second,
  98                      SCM padding,
  99                      SCM minimum),
 100            "Construct a stencil by putting @var{second} next to @var{first}."
 101            "  @var{axis} can be 0 (x-axis) or@tie{}1 (y-axis)."
 102            "  @var{direction} can be -1 (left or down) or@tie{}1 (right or"
 103            "  up).  The stencils are juxtaposed with @var{padding} as extra"
 104            " space.  If this puts the reference points closer than"
 105            " @var{minimum}, they are moved by the latter amount."
 106            "  @var{first} and @var{second} may also be @code{'()} or"
 107            " @code{#f}.")
 108 {
 109   Stencil *s1 = unsmob_stencil (first);
 110   Stencil *s2 = unsmob_stencil (second);
 111   Stencil result;
 112
 113   SCM_ASSERT_TYPE (s1 || first == SCM_BOOL_F || first == SCM_EOL,
 114                    first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()");
 115   SCM_ASSERT_TYPE (s2 || second == SCM_BOOL_F || second == SCM_EOL,
 116                    second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()");
 117   LY_ASSERT_TYPE (is_axis, axis,  2);
 118   LY_ASSERT_TYPE (is_direction, direction, 3);
 119
 120   Real p = 0.0;
 121   if (padding != SCM_UNDEFINED)
 122     {
 123       LY_ASSERT_TYPE (scm_is_number, padding, 5);
 124       p = scm_to_double (padding);
 125     }
 126   Real m = 0.0;
 127   if (minimum != SCM_UNDEFINED)
 128     {
 129       LY_ASSERT_TYPE (scm_is_number, minimum, 6);
 130       m = scm_to_double (minimum);
 131     }
 132
 133   if (s1)
 134     result = *s1;
 135
 136   if (s2)
 137     result.add_at_edge (Axis (scm_to_int (axis)),
 138                         Direction (scm_to_int (direction)), *s2, p);
 139
 140   return result.smobbed_copy ();
 141 }
 142
 143 LY_DEFINE (ly_stencil_add, "ly:stencil-add",
 144            0, 0, 1, (SCM args),
 145            "Combine stencils.  Takes any number of arguments.")
 146 {
 147 #define FUNC_NAME __FUNCTION__
 148   SCM_VALIDATE_REST_ARGUMENT (args);
 149
 150   SCM expr = SCM_EOL;
 151   SCM *tail = &expr;
 152   Box extent;
 153   extent.set_empty ();
 154
 155   while (!SCM_NULLP (args))
 156     {
 157       Stencil *s = unsmob_stencil (scm_car (args));
 158       if (!s)
 159         SCM_ASSERT_TYPE (s, scm_car (args), SCM_ARGn, __FUNCTION__, "Stencil");
 160
 161       extent.unite (s->extent_box ());
 162       *tail = scm_cons (s->expr (), SCM_EOL);
 163       tail = SCM_CDRLOC (*tail);
 164       args = scm_cdr (args);
 165     }
 166
 167   expr = scm_cons (ly_symbol2scm ("combine-stencil"), expr);
 168   return Stencil (extent, expr).smobbed_copy ();
 169 }
 170
 171 LY_DEFINE (ly_make_stencil, "ly:make-stencil",
 172            1, 2, 0, (SCM expr, SCM xext, SCM yext),
 173            "Stencils are device independent output expressions."
 174            "  They carry two pieces of information:\n"
 175            "\n"
 176            "@enumerate\n"
 177            "@item\n"
 178            "A specification of how to print this object."
 179            "  This specification is processed by the output backends,"
 180            " for example @file{scm/output-ps.scm}.\n"
 181            "\n"
 182            "@item\n"
 183            "The vertical and horizontal extents of the object, given as"
 184            " pairs.  If an extent is unspecified (or if you use"
 185            " @code{(1000 . -1000)} as its value), it is taken to be empty.\n"
 186            "@end enumerate\n")
 187 {
 188   SCM_ASSERT_TYPE (!scm_is_pair (expr)
 189                    || is_stencil_head (scm_car (expr)),
 190                    expr, SCM_ARG1, __FUNCTION__, "registered stencil expression");
 191
 192
 193   Interval x;
 194   if (xext != SCM_UNDEFINED)
 195     {
 196       LY_ASSERT_TYPE (is_number_pair, xext, 2);
 197       x = ly_scm2interval (xext);
 198     }
 199
 200   Interval y;
 201   if (yext != SCM_UNDEFINED)
 202     {
 203       LY_ASSERT_TYPE (is_number_pair, yext, 3);
 204       y = ly_scm2interval (yext);
 205     }
 206
 207   Box b (x, y);
 208   Stencil s (b, expr);
 209   return s.smobbed_copy ();
 210 }
 211
 212 LY_DEFINE (ly_stencil_aligned_to, "ly:stencil-aligned-to",
 213            3, 0, 0, (SCM stil, SCM axis, SCM dir),
 214            "Align @var{stil} using its own extents.  @var{dir} is a number."
 215            "  @code{-1} and @code{1} are left and right, respectively."
 216            "  Other values are interpolated (so @code{0} means the center).")
 217 {
 218   LY_ASSERT_SMOB (Stencil, stil, 1);
 219   LY_ASSERT_TYPE (is_axis, axis, 2);
 220   LY_ASSERT_TYPE (scm_is_number, dir, 3);
 221
 222   Stencil target = *unsmob_stencil (stil);
 223
 224   target.align_to ((Axis)scm_to_int (axis),
 225                    scm_to_double (dir));
 226   return target.smobbed_copy ();
 227 }
 228
 229 LY_DEFINE (ly_stencil_fonts, "ly:stencil-fonts",
 230            1, 0, 0, (SCM s),
 231            "Analyze @var{s}, and return a list of fonts used"
 232            " in@tie{}@var{s}.")
 233 {
 234   LY_ASSERT_SMOB (Stencil, s, 1);
 235   Stencil *stil = unsmob_stencil (s);
 236   return find_expression_fonts (stil->expr ());
 237 }
 238
 239 LY_DEFINE (ly_stencil_in_color, "ly:stencil-in-color",
 240            4, 0, 0, (SCM stc, SCM r, SCM g, SCM b),
 241            "Put @var{stc} in a different color.")
 242 {
 243   LY_ASSERT_SMOB (Stencil, stc, 1);
 244   Stencil *stil = unsmob_stencil (stc);
 245   return Stencil (stil->extent_box (),
 246                   scm_list_3 (ly_symbol2scm ("color"),
 247                               scm_list_3 (r, g, b),
 248                               stil->expr ())).smobbed_copy ();
 249 }
 250
 251 struct Stencil_interpret_arguments
 252 {
 253   SCM func;
 254   SCM arg1;
 255 };
 256
 257 void stencil_interpret_in_scm (void *p, SCM expr)
 258 {
 259   Stencil_interpret_arguments *ap = (Stencil_interpret_arguments *) p;
 260   scm_call_2 (ap->func, ap->arg1, expr);
 261 }
 262
 263 LY_DEFINE (ly_interpret_stencil_expression, "ly:interpret-stencil-expression",
 264            4, 0, 0, (SCM expr, SCM func, SCM arg1, SCM offset),
 265            "Parse @var{expr}, feed bits to @var{func} with first arg"
 266            " @var{arg1} having offset @var{offset}.")
 267 {
 268   LY_ASSERT_TYPE (ly_is_procedure, func, 2);
 269
 270   Stencil_interpret_arguments a;
 271   a.func = func;
 272   a.arg1 = arg1;
 273   Offset o = ly_scm2offset (offset);
 274
 275   interpret_stencil_expression (expr, stencil_interpret_in_scm, (void *) & a, o);
 276
 277   return SCM_UNSPECIFIED;
 278 }
 279
 280 LY_DEFINE (ly_bracket, "ly:bracket",
 281            4, 0, 0,
 282            (SCM a, SCM iv, SCM t, SCM p),
 283            "Make a bracket in direction@tie{}@var{a}.  The extent of the"
 284            " bracket is given by @var{iv}.  The wings protrude by an amount"
 285            " of@tie{}@var{p}, which may be negative.  The thickness is given"
 286            " by@tie{}@var{t}.")
 287 {
 288   LY_ASSERT_TYPE (is_axis, a, 1);
 289   LY_ASSERT_TYPE (is_number_pair, iv, 2);
 290   LY_ASSERT_TYPE (scm_is_number, t, 3);
 291   LY_ASSERT_TYPE (scm_is_number, p, 4);
 292
 293   return Lookup::bracket ((Axis)scm_to_int (a), ly_scm2interval (iv),
 294                           scm_to_double (t),
 295                           scm_to_double (p),
 296                           0.95 * scm_to_double (t)).smobbed_copy ();
 297 }
 298
 299 LY_DEFINE (ly_stencil_rotate, "ly:stencil-rotate",
 300            4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
 301            "Return a stencil @var{stil} rotated @var{angle} degrees around"
 302            " the relative offset (@var{x}, @var{y}). E.g. an offset of"
 303            " (-1, 1) will rotate the stencil around the left upper corner.")
 304 {
 305   Stencil *s = unsmob_stencil (stil);
 306   LY_ASSERT_SMOB (Stencil, stil, 1);
 307   LY_ASSERT_TYPE (scm_is_number, angle, 2);
 308   LY_ASSERT_TYPE (scm_is_number, x, 3);
 309   LY_ASSERT_TYPE (scm_is_number, y, 4);
 310   Real a = scm_to_double (angle);
 311   Real x_off = scm_to_double (x);
 312   Real y_off = scm_to_double (y);
 313
 314   SCM new_s = s->smobbed_copy ();
 315   Stencil *q = unsmob_stencil (new_s);
 316   q->rotate_degrees (a, Offset (x_off, y_off));
 317   return new_s;
 318 }
 319
 320 LY_DEFINE (ly_stencil_rotate_absolute, "ly:stencil-rotate-absolute",
 321            4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
 322            "Return a stencil @var{stil} rotated @var{angle} degrees around"
 323            " point (@var{x}, @var{y}), given in absolute coordinates.")
 324 {
 325   Stencil *s = unsmob_stencil (stil);
 326   LY_ASSERT_SMOB (Stencil, stil, 1);
 327   LY_ASSERT_TYPE (scm_is_number, angle, 2);
 328   LY_ASSERT_TYPE (scm_is_number, x, 3);
 329   LY_ASSERT_TYPE (scm_is_number, y, 4);
 330   Real a = scm_to_double (angle);
 331   Real x_off = scm_to_double (x);
 332   Real y_off = scm_to_double (y);
 333
 334   SCM new_s = s->smobbed_copy ();
 335   Stencil *q = unsmob_stencil (new_s);
 336   q->rotate_degrees_absolute (a, Offset (x_off, y_off));
 337   return new_s;
 338 }
 339
 340 LY_DEFINE (ly_round_filled_box, "ly:round-filled-box",
 341            3, 0, 0,
 342            (SCM xext, SCM yext, SCM blot),
 343            "Make a @code{Stencil} object that prints a black box of"
 344            " dimensions @var{xext}, @var{yext} and roundness @var{blot}.")
 345 {
 346   LY_ASSERT_TYPE (is_number_pair, xext, 1);
 347   LY_ASSERT_TYPE (is_number_pair, yext, 2);
 348   LY_ASSERT_TYPE (scm_is_number, blot, 3);
 349
 350   return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)),
 351                                    scm_to_double (blot)).smobbed_copy ();
 352 }
 353
 354 LY_DEFINE (ly_round_filled_polygon, "ly:round-filled-polygon",
 355            2, 0, 0,
 356            (SCM points, SCM blot),
 357            "Make a @code{Stencil} object that prints a black polygon with"
 358            " corners at the points defined by @var{points} (list of coordinate"
 359            " pairs) and roundness @var{blot}.")
 360 {
 361   SCM_ASSERT_TYPE (scm_ilength (points) > 0, points, SCM_ARG1, __FUNCTION__, "list of coordinate pairs");
 362   LY_ASSERT_TYPE (scm_is_number, blot, 2);
 363   vector<Offset> pts;
 364   for (SCM p = points; scm_is_pair (p); p = scm_cdr (p))
 365     {
 366       SCM scm_pt = scm_car (p);
 367       if (scm_is_pair (scm_pt)) {
 368         pts.push_back (ly_scm2offset (scm_pt));
 369       } else {
 370         // TODO: Print out warning
 371       }
 372     }
 373   return Lookup::round_filled_polygon (pts, scm_to_double (blot)).smobbed_copy ();
 374 }
 375
 376 LY_DEFINE (ly_register_stencil_expression, "ly:register-stencil-expression",
 377            1, 0, 0,
 378            (SCM symbol),
 379            "Add @var{symbol} as head of a stencil expression.")
 380 {
 381   LY_ASSERT_TYPE (ly_is_symbol, symbol, 1);
 382   register_stencil_head (symbol);
 383   return SCM_UNSPECIFIED;
 384 }
 385
 386 LY_DEFINE (ly_all_stencil_expressions, "ly:all-stencil-expressions",
 387            0, 0, 0,
 388            (),
 389            "Return all symbols recognized as stencil expressions.")
 390 {
 391   return all_stencil_heads ();
 392 }
 393
 394 LY_DEFINE (ly_stencil_scale, "ly:stencil-scale",
 395             3, 0, 0, (SCM stil, SCM x, SCM y),
 396            "Scale @var{stil} using the horizontal and vertical scaling"
 397            " factors @var{x} and @var{y}.")
 398 {
 399   Stencil *s = unsmob_stencil (stil);
 400   LY_ASSERT_SMOB (Stencil, stil, 1);
 401   LY_ASSERT_TYPE (scm_is_number, x, 2);
 402   LY_ASSERT_TYPE (scm_is_number, y, 3);
 403
 404   SCM new_s = s->smobbed_copy ();
 405   Stencil *q = unsmob_stencil (new_s);
 406
 407   q->scale (scm_to_double (x), scm_to_double (y));
 408   return new_s;
 409 }