2 stencil-scheme.cc -- implement Stencil scheme accessors
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "font-metric.hh"
11 #include "libc-extension.hh"
16 TODO: naming add/combine.
19 LY_DEFINE (ly_stencil_translate_axis, "ly:stencil-translate-axis",
20 3, 0, 0, (SCM stil, SCM amount, SCM axis),
21 "Return a copy of @var{stil} but translated by @var{amount} in @var{axis} direction.")
23 Stencil *s = unsmob_stencil (stil);
24 LY_ASSERT_FIRST_SMOB(Stencil, stil);
25 LY_ASSERT_TYPE(scm_is_number, 2);
27 Real real_amount = scm_to_double (amount);
30 SCM_ASSERT_TYPE (!isinf (real_amount) && !isnan (real_amount),
31 amount, SCM_ARG2, __FUNCTION__, "finite number");
34 LY_ASSERT_TYPE(is_axis, 3);
36 SCM new_s = s->smobbed_copy ();
37 Stencil *q = unsmob_stencil (new_s);
38 q->translate_axis (real_amount, Axis (scm_to_int (axis)));
42 LY_DEFINE (ly_stencil_translate, "ly:stencil-translate",
43 2, 0, 0, (SCM stil, SCM offset),
44 "Return a @var{stil}, "
45 "but translated by @var{offset} (a pair of numbers).")
47 Stencil *s = unsmob_stencil (stil);
48 LY_ASSERT_FIRST_SMOB(Stencil, stil);
49 LY_ASSERT_TYPE(is_number_pair, 2);
50 Offset o = ly_scm2offset (offset);
52 SCM new_s = s->smobbed_copy ();
53 Stencil *q = unsmob_stencil (new_s);
58 LY_DEFINE (ly_stencil_expr, "ly:stencil-expr",
60 "Return the expression of @var{stil}.")
62 Stencil *s = unsmob_stencil (stil);
63 LY_ASSERT_FIRST_SMOB(Stencil, stil);
67 LY_DEFINE (ly_stencil_extent, "ly:stencil-extent",
68 2, 0, 0, (SCM stil, SCM axis),
69 "Return a pair of numbers signifying the extent of @var{stil} in "
70 "@var{axis} direction (0 or 1 for x and y axis respectively).")
72 Stencil *s = unsmob_stencil (stil);
73 LY_ASSERT_FIRST_SMOB(Stencil, stil);
74 LY_ASSERT_TYPE(is_axis, 2);
76 return ly_interval2scm (s->extent (Axis (scm_to_int (axis))));
79 LY_DEFINE (ly_stencil_empty_p, "ly:stencil-empty?",
81 "Return whether @var{stil} is empty ")
83 Stencil *s = unsmob_stencil (stil);
84 LY_ASSERT_FIRST_SMOB(Stencil, stil);
85 return scm_from_bool (s->is_empty ());
88 LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge",
89 4, 2, 0, (SCM first, SCM axis, SCM direction,
93 "Construct a stencil by putting @var{second} next to @var{first}. "
94 "@var{axis} can be 0 (x-axis) or 1 (y-axis), "
95 "@var{direction} can be -1 (left or down) or 1 (right or up). "
96 "The stencils are juxtaposed with @var{padding} as extra space. "
97 "If this puts the reference points closer than @var{minimum}, "
98 "they are moved by the latter amount."
99 "@var{first} and @var{second} may also be '() or #f.")
101 Stencil *s1 = unsmob_stencil (first);
102 Stencil *s2 = unsmob_stencil (second);
105 LY_FUNC_NOTE_FIRST_ARG(first);
106 SCM_ASSERT_TYPE (s1 || first == SCM_BOOL_F || first == SCM_EOL,
107 first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()");
108 SCM_ASSERT_TYPE (s2 || second == SCM_BOOL_F || second == SCM_EOL,
109 second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()");
110 LY_ASSERT_TYPE(is_axis, 2);
111 LY_ASSERT_TYPE(is_direction, 3);
114 if (padding != SCM_UNDEFINED)
116 LY_ASSERT_TYPE(scm_is_number, 5);
117 p = scm_to_double (padding);
120 if (minimum != SCM_UNDEFINED)
122 LY_ASSERT_TYPE(scm_is_number, 6);
123 m = scm_to_double (minimum);
130 result.add_at_edge (Axis (scm_to_int (axis)),
131 Direction (scm_to_int (direction)), *s2, p);
133 return result.smobbed_copy ();
136 LY_DEFINE (ly_stencil_add, "ly:stencil-add",
138 "Combine stencils. Takes any number of arguments.")
140 #define FUNC_NAME __FUNCTION__
141 SCM_VALIDATE_REST_ARGUMENT (args);
148 while (!SCM_NULLP (args))
150 Stencil *s = unsmob_stencil (scm_car (args));
152 SCM_ASSERT_TYPE (s, scm_car (args), SCM_ARGn, __FUNCTION__, "Stencil");
154 extent.unite (s->extent_box ());
155 *tail = scm_cons (s->expr (), SCM_EOL);
156 tail = SCM_CDRLOC (*tail);
157 args = scm_cdr (args);
160 expr = scm_cons (ly_symbol2scm ("combine-stencil"), expr);
161 return Stencil (extent, expr).smobbed_copy ();
164 LY_DEFINE (ly_make_stencil, "ly:make-stencil",
165 1, 2, 0, (SCM expr, SCM xext, SCM yext),
167 "Stencils are a device independent output expressions."
168 "They carry two pieces of information: \n\n"
169 "1: a specification of how to print this object. "
170 "This specification is processed by the output backends, "
171 " for example @file{scm/output-ps.scm}.\n\n"
172 "2: the vertical and horizontal extents of the object.\n\n"
173 "If the extents are unspecified, they are taken to be empty."
176 LY_FUNC_NOTE_FIRST_ARG (expr);
177 SCM_ASSERT_TYPE (!scm_is_pair (expr)
178 || is_stencil_head (scm_car (expr)),
179 expr, SCM_ARG1, __FUNCTION__, "registered stencil expression");
183 if (xext != SCM_UNDEFINED)
185 LY_ASSERT_TYPE(is_number_pair, 2);
186 x = ly_scm2interval (xext);
190 if (yext != SCM_UNDEFINED)
192 LY_ASSERT_TYPE(is_number_pair, 3);
193 y = ly_scm2interval (yext);
198 return s.smobbed_copy ();
201 LY_DEFINE (ly_stencil_aligned_to, "ly:stencil-aligned-to",
202 3, 0, 0, (SCM stil, SCM axis, SCM dir),
203 "Align @var{stil} using its own extents. "
204 "@var{dir} is a number -1, 1 are left and right respectively. "
205 "Other values are interpolated (so 0 means the center).")
207 LY_ASSERT_FIRST_SMOB(Stencil, stil);
208 LY_ASSERT_TYPE(is_axis, 2);
209 LY_ASSERT_TYPE(scm_is_number, 3);
211 Stencil target = *unsmob_stencil (stil);
213 target.align_to ((Axis)scm_to_int (axis),
214 scm_to_double (dir));
215 return target.smobbed_copy ();
218 LY_DEFINE (ly_stencil_fonts, "ly:stencil-fonts",
220 " Analyse @var{s}, and return a list of fonts used in @var{s}.")
222 LY_ASSERT_FIRST_SMOB (Stencil, s);
223 Stencil *stil = unsmob_stencil (s);
224 return find_expression_fonts (stil->expr ());
227 LY_DEFINE (ly_stencil_in_color, "ly:stencil-in-color",
228 4, 0, 0, (SCM stc, SCM r, SCM g, SCM b),
229 "Put @var{stc} in a different color.")
231 LY_ASSERT_FIRST_SMOB (Stencil, stc);
232 Stencil *stil = unsmob_stencil (stc);
233 return Stencil (stil->extent_box (),
234 scm_list_3 (ly_symbol2scm ("color"),
235 scm_list_3 (r, g, b),
236 stil->expr ())).smobbed_copy ();
239 struct Stencil_interpret_arguments
245 void stencil_interpret_in_scm (void *p, SCM expr)
247 Stencil_interpret_arguments *ap = (Stencil_interpret_arguments *) p;
248 scm_call_2 (ap->func, ap->arg1, expr);
251 LY_DEFINE (ly_interpret_stencil_expression, "ly:interpret-stencil-expression",
252 4, 0, 0, (SCM expr, SCM func, SCM arg1, SCM offset),
253 "Parse EXPR, feed bits to FUNC with first arg ARG1")
255 LY_FUNC_NOTE_FIRST_ARG(expr);
256 LY_ASSERT_TYPE (ly_is_procedure, 2);
258 Stencil_interpret_arguments a;
261 Offset o = ly_scm2offset (offset);
263 interpret_stencil_expression (expr, stencil_interpret_in_scm, (void *) & a, o);
265 return SCM_UNSPECIFIED;
268 LY_DEFINE (ly_bracket, "ly:bracket",
270 (SCM a, SCM iv, SCM t, SCM p),
271 "Make a bracket in direction @var{a}. The extent of the bracket is "
272 "given by @var{iv}. The wings protude by an amount of @var{p}, which "
273 "may be negative. The thickness is given by @var{t}.")
275 LY_ASSERT_FIRST_TYPE(is_axis, a);
276 LY_ASSERT_TYPE(is_number_pair, 2);
277 LY_ASSERT_TYPE(scm_is_number, 3);
278 LY_ASSERT_TYPE(scm_is_number, 4);
280 return Lookup::bracket ((Axis)scm_to_int (a), ly_scm2interval (iv),
283 0.95 * scm_to_double (t)).smobbed_copy ();
286 LY_DEFINE (ly_stencil_rotate, "ly:stencil-rotate",
287 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
288 "Return a @var{stil} rotated @var{angle} degrees around point (@var{x}, @var{y}).")
290 Stencil *s = unsmob_stencil (stil);
291 LY_ASSERT_FIRST_SMOB(Stencil, stil);
292 LY_ASSERT_TYPE(scm_is_number, 2);
293 LY_ASSERT_TYPE(scm_is_number, 3);
294 LY_ASSERT_TYPE(scm_is_number, 4);
295 Real a = scm_to_double (angle);
296 Real x_off = scm_to_double (x);
297 Real y_off = scm_to_double (y);
299 SCM new_s = s->smobbed_copy ();
300 Stencil *q = unsmob_stencil (new_s);
301 q->rotate (a, Offset (x_off, y_off));
305 LY_DEFINE (ly_round_filled_box, "ly:round-filled-box",
307 (SCM xext, SCM yext, SCM blot),
308 "Make a @code{Stencil} "
309 "that prints a black box of dimensions @var{xext}, "
310 "@var{yext} and roundness @var{blot}.")
312 LY_ASSERT_FIRST_TYPE(is_number_pair, xext);
313 LY_ASSERT_TYPE(is_number_pair, 2);
314 LY_ASSERT_TYPE(scm_is_number, 3);
316 return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)),
317 scm_to_double (blot)).smobbed_copy ();
320 LY_DEFINE (ly_register_stencil_expression, "ly:register-stencil-expression",
323 "Add @var{symbol} as head of a stencil expression")
325 LY_ASSERT_FIRST_TYPE(ly_is_symbol, symbol);
326 register_stencil_head (symbol);
327 return SCM_UNSPECIFIED;
330 LY_DEFINE (ly_all_stencil_expressions, "ly:all-stencil-expressions",
333 "Return all symbols recognized as stencil expressions.")
335 return all_stencil_heads ();