2 stencil.cc -- implement Stencil
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
13 #include "dimensions.hh"
14 #include "font-metric.hh"
15 #include "input-smob.hh"
16 #include "libc-extension.hh" // isinf
17 #include "string-convert.hh"
20 #include "ly-smobs.icc"
28 Stencil::Stencil (Box b, SCM func)
35 Stencil::print_smob (SCM, SCM port, scm_print_state *)
37 scm_puts ("#<Stencil ", port);
38 scm_puts (" >", port);
43 Stencil::mark_smob (SCM smob)
45 Stencil *s = (Stencil *) SCM_CELL_WORD_1 (smob);
49 IMPLEMENT_SIMPLE_SMOBS (Stencil);
50 IMPLEMENT_TYPE_P (Stencil, "ly:stencil?");
51 IMPLEMENT_DEFAULT_EQUAL_P (Stencil);
54 Stencil::extent (Axis a) const
59 /* Hmm... maybe this is not such a good idea ; stuff can be empty,
62 Stencil::is_empty () const
64 return expr_ == SCM_EOL;
68 Stencil::expr () const
74 Stencil::extent_box () const
79 Stencil::origin () const
85 Stencil::translate (Offset o)
96 programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
98 + "Setting to zero.");
104 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
106 expr_, SCM_UNDEFINED);
113 Stencil::translate_axis (Real x, Axis a)
121 Stencil::add_stencil (Stencil const &s)
123 expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
128 Stencil::set_empty (bool e)
132 dim_[X_AXIS].set_empty ();
133 dim_[Y_AXIS].set_empty ();
137 dim_[X_AXIS] = Interval (0, 0);
138 dim_[Y_AXIS] = Interval (0, 0);
143 Stencil::align_to (Axis a, Real x)
148 Interval i (extent (a));
149 translate_axis (-i.linear_combination (x), a);
152 /* FIXME: unintuitive naming, you would expect *this to be moved.
153 Kept (keeping?) API for compat with add_at_edge ().
155 What is PADDING, what is MINIMUM, exactly? */
157 Stencil::moved_to_edge (Axis a, Direction d, Stencil const &s,
158 Real padding, Real minimum) const
160 Interval my_extent = dim_[a];
161 Interval i (s.extent (a));
165 programming_error ("Stencil::moved_to_edge: adding empty stencil.");
167 // SCM_ASSERT_TYPE (0, s.expr (), SCM_ARG1, __FUNCTION__, "non-empty stencil");
172 Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
176 toadd.translate_axis (offset, a);
178 if (minimum > 0 && d * (-origin ()[a] + toadd.origin ()[a]) < minimum)
179 toadd.translate_axis (-toadd.origin ()[a]
180 + origin ()[a] + d * minimum, a);
185 /* See scheme Function. */
187 Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding,
190 add_stencil (moved_to_edge (a, d, s, padding, minimum));
193 /****************************************************************/
196 interpret_stencil_expression (SCM expr,
197 void (*func) (void *, SCM),
203 if (!scm_is_pair (expr))
206 SCM head = scm_car (expr);
208 if (head == ly_symbol2scm ("translate-stencil"))
210 o += ly_scm2offset (scm_cadr (expr));
211 expr = scm_caddr (expr);
213 else if (head == ly_symbol2scm ("combine-stencil"))
215 for (SCM x = scm_cdr (expr); scm_is_pair (x); x = scm_cdr (x))
216 interpret_stencil_expression (scm_car (x), func, func_arg, o);
219 else if (head == ly_symbol2scm ("grob-cause"))
221 SCM grob = scm_cadr (expr);
223 (*func) (func_arg, scm_list_3 (head,
224 ly_quote_scm (ly_offset2scm (o)), grob));
225 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
226 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("no-origin")));
229 else if (head == ly_symbol2scm ("color"))
231 SCM color = scm_cadr (expr);
232 SCM r = scm_car (color);
233 SCM g = scm_cadr (color);
234 SCM b = scm_caddr (color);
236 (*func) (func_arg, scm_list_4 (ly_symbol2scm ("setcolor"), r, g, b));
237 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
238 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("resetcolor")));
245 scm_list_4 (ly_symbol2scm ("placebox"),
246 scm_make_real (o[X_AXIS]),
247 scm_make_real (o[Y_AXIS]),
260 find_font_function (void *fs, SCM x)
262 Font_list *me = (Font_list *) fs;
264 if (scm_car (x) == ly_symbol2scm ("placebox"))
266 SCM args = scm_cdr (x);
267 SCM what = scm_caddr (args);
269 if (scm_is_pair (what))
271 SCM head = scm_car (what);
272 if (ly_symbol2scm ("text") == head)
273 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
274 else if (head == ly_symbol2scm ("char"))
275 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
281 find_expression_fonts (SCM expr)
287 interpret_stencil_expression (expr, &find_font_function,
288 (void *) & fl, Offset (0, 0));