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 <libc-extension.hh> // isinf
15 #include "input-smob.hh"
16 #include "font-metric.hh"
17 #include "dimensions.hh"
18 #include "string-convert.hh"
21 #include "ly-smobs.icc"
29 Stencil::Stencil (Box b, SCM func)
36 Stencil::print_smob (SCM, SCM port, scm_print_state *)
38 scm_puts ("#<Stencil ", port);
39 scm_puts (" >", port);
44 Stencil::mark_smob (SCM smob)
46 Stencil *s = (Stencil *) SCM_CELL_WORD_1 (smob);
50 IMPLEMENT_SIMPLE_SMOBS (Stencil);
51 IMPLEMENT_TYPE_P (Stencil, "ly:stencil?");
52 IMPLEMENT_DEFAULT_EQUAL_P (Stencil);
55 Stencil::extent (Axis a) const
60 /* Hmm... maybe this is not such a good idea ; stuff can be empty,
63 Stencil::is_empty () const
65 return expr_ == SCM_EOL;
69 Stencil::expr () const
75 Stencil::extent_box () const
80 Stencil::origin () const
86 Stencil::translate (Offset o)
91 if (isinf (o[a]) || isnan (o[a]))
93 programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
95 + "Setting to zero.");
101 expr_ = scm_list_n (ly_symbol2scm ("translate-stencil"),
103 expr_, SCM_UNDEFINED);
110 Stencil::translate_axis (Real x, Axis a)
118 Stencil::add_stencil (Stencil const &s)
120 expr_ = scm_list_3 (ly_symbol2scm ("combine-stencil"), s.expr_, expr_);
125 Stencil::set_empty (bool e)
129 dim_[X_AXIS].set_empty ();
130 dim_[Y_AXIS].set_empty ();
134 dim_[X_AXIS] = Interval (0, 0);
135 dim_[Y_AXIS] = Interval (0, 0);
140 Stencil::align_to (Axis a, Real x)
145 Interval i (extent (a));
146 translate_axis (-i.linear_combination (x), a);
149 /* FIXME: unintuitive naming, you would expect *this to be moved.
150 Kept (keeping?) API for compat with add_at_edge ().
152 What is PADDING, what is MINIMUM, exactly? */
154 Stencil::moved_to_edge (Axis a, Direction d, Stencil const &s,
155 Real padding, Real minimum) const
157 Interval my_extent = dim_[a];
158 Interval i (s.extent (a));
162 programming_error ("Stencil::moved_to_edge: adding empty stencil.");
164 // SCM_ASSERT_TYPE (0, s.expr (), SCM_ARG1, __FUNCTION__, "non-empty stencil");
169 Real offset = (my_extent.is_empty () ? 0.0 : my_extent[d] - his_extent)
173 toadd.translate_axis (offset, a);
175 if (minimum > 0 && d * (-origin ()[a] + toadd.origin ()[a]) < minimum)
176 toadd.translate_axis (-toadd.origin ()[a]
177 + origin ()[a] + d * minimum, a);
182 /* See scheme Function. */
184 Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding,
187 add_stencil (moved_to_edge (a, d, s, padding, minimum));
190 /****************************************************************/
193 interpret_stencil_expression (SCM expr,
194 void (*func) (void *, SCM),
200 if (!scm_is_pair (expr))
203 SCM head = scm_car (expr);
205 if (head == ly_symbol2scm ("translate-stencil"))
207 o += ly_scm2offset (scm_cadr (expr));
208 expr = scm_caddr (expr);
210 else if (head == ly_symbol2scm ("combine-stencil"))
212 for (SCM x = scm_cdr (expr); scm_is_pair (x); x = scm_cdr (x))
213 interpret_stencil_expression (scm_car (x), func, func_arg, o);
216 else if (head == ly_symbol2scm ("grob-cause"))
218 SCM grob = scm_cadr (expr);
220 (*func) (func_arg, scm_list_3 (head,
221 ly_quote_scm (ly_offset2scm (o)), grob));
222 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
223 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("no-origin")));
226 else if (head == ly_symbol2scm ("color"))
228 SCM color = scm_cadr (expr);
229 SCM r = scm_car (color);
230 SCM g = scm_cadr (color);
231 SCM b = scm_caddr (color);
233 (*func) (func_arg, scm_list_4 (ly_symbol2scm ("setcolor"), r, g, b));
234 interpret_stencil_expression (scm_caddr (expr), func, func_arg, o);
235 (*func) (func_arg, scm_list_1 (ly_symbol2scm ("resetcolor")));
242 scm_list_4 (ly_symbol2scm ("placebox"),
243 scm_make_real (o[X_AXIS]),
244 scm_make_real (o[Y_AXIS]),
257 find_font_function (void *fs, SCM x)
259 Font_list *me = (Font_list *) fs;
261 if (scm_car (x) == ly_symbol2scm ("placebox"))
263 SCM args = scm_cdr (x);
264 SCM what = scm_caddr (args);
266 if (scm_is_pair (what))
268 SCM head = scm_car (what);
269 if (ly_symbol2scm ("text") == head)
270 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
271 else if (head == ly_symbol2scm ("char"))
272 me->fonts_ = scm_cons (scm_cadr (what), me->fonts_);
278 find_expression_fonts (SCM expr)
284 interpret_stencil_expression (expr, &find_font_function,
285 (void *) &fl, Offset (0, 0));