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)
90 if (isinf (o[a]) || isnan (o[a]))
92 programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
94 + "Setting to zero.");
100 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
102 expr_, SCM_UNDEFINED);
109 Stencil::translate_axis (Real x, Axis a)
117 Stencil::add_stencil (Stencil const &s)
119 expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
124 Stencil::set_empty (bool e)
128 dim_[X_AXIS].set_empty ();
129 dim_[Y_AXIS].set_empty ();
133 dim_[X_AXIS] = Interval (0, 0);
134 dim_[Y_AXIS] = Interval (0, 0);
139 Stencil::align_to (Axis a, Real x)
144 Interval i (extent (a));
145 translate_axis (-i.linear_combination (x), a);
148 /* FIXME: unintuitive naming, you would expect *this to be moved.
149 Kept (keeping?) API for compat with add_at_edge ().
151 What is PADDING, what is MINIMUM, exactly? */
153 Stencil::moved_to_edge (Axis a, Direction d, Stencil const &s,
154 Real padding, Real minimum) const
156 Interval my_extent = dim_[a];
157 Interval i (s.extent (a));
161 programming_error ("Stencil::moved_to_edge: adding empty stencil.");
163 // SCM_ASSERT_TYPE (0, s.expr (), SCM_ARG1, __FUNCTION__, "non-empty stencil");
168 Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
172 toadd.translate_axis (offset, a);
174 if (minimum > 0 && d * (-origin ()[a] + toadd.origin ()[a]) < minimum)
175 toadd.translate_axis (-toadd.origin ()[a]
176 + origin ()[a] + d * minimum, a);
181 /* See scheme Function. */
183 Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding,
186 add_stencil (moved_to_edge (a, d, s, padding, minimum));
189 /****************************************************************/
192 interpret_stencil_expression (SCM expr,
193 void (*func) (void *, SCM),
199 if (!scm_is_pair (expr))
202 SCM head = scm_car (expr);
204 if (head == ly_symbol2scm ("translate-stencil"))
206 o += ly_scm2offset (scm_cadr (expr));
207 expr = scm_caddr (expr);
209 else if (head == ly_symbol2scm ("combine-stencil"))
211 for (SCM x = scm_cdr (expr); scm_is_pair (x); x = scm_cdr (x))
212 interpret_stencil_expression (scm_car (x), func, func_arg, o);
215 else if (head == ly_symbol2scm ("grob-cause"))
217 SCM grob = scm_cadr (expr);
219 (*func) (func_arg, scm_list_3 (head,
220 ly_quote_scm (ly_offset2scm (o)), grob));
221 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
222 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("no-origin")));
225 else if (head == ly_symbol2scm ("color"))
227 SCM color = scm_cadr (expr);
228 SCM r = scm_car (color);
229 SCM g = scm_cadr (color);
230 SCM b = scm_caddr (color);
232 (*func) (func_arg, scm_list_4 (ly_symbol2scm ("setcolor"), r, g, b));
233 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
234 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("resetcolor")));
241 scm_list_4 (ly_symbol2scm ("placebox"),
242 scm_make_real (o[X_AXIS]),
243 scm_make_real (o[Y_AXIS]),
256 find_font_function (void *fs, SCM x)
258 Font_list *me = (Font_list *) fs;
260 if (scm_car (x) == ly_symbol2scm ("placebox"))
262 SCM args = scm_cdr (x);
263 SCM what = scm_caddr (args);
265 if (scm_is_pair (what))
267 SCM head = scm_car (what);
268 if (ly_symbol2scm ("text") == head)
269 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
270 else if (head == ly_symbol2scm ("char"))
271 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
277 find_expression_fonts (SCM expr)
283 interpret_stencil_expression (expr, &find_font_function,
284 (void *) & fl, Offset (0, 0));