2 time-signature.cc -- implement Time_signature
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "molecule.hh"
12 #include "text-item.hh"
13 #include "time-signature.hh"
14 #include "paper-def.hh"
15 #include "font-interface.hh"
17 #include "staff-symbol-referencer.hh"
19 MAKE_SCHEME_CALLBACK (Time_signature,brew_molecule,1);
21 TODO: make different functions for special and normal timesigs.
24 Time_signature::brew_molecule (SCM smob)
26 Grob * me = unsmob_grob (smob);
27 SCM st = me->get_grob_property ("style");
28 SCM frac = me->get_grob_property ("fraction");
33 n = gh_scm2int (ly_car (frac));
34 d = gh_scm2int (ly_cdr (frac));
40 String style (ly_scm2string (scm_symbol_to_string (st)));
43 m = time_signature (me, n, 0);
47 m = special_time_signature (me, style, n, d);
51 m = time_signature (me, n,d);
53 if (Staff_symbol_referencer::line_count (me) % 2 == 0)
54 m.translate_axis (Staff_symbol_referencer::staff_space (me)/2 , Y_AXIS);
56 return m.smobbed_copy ();
60 Time_signature::special_time_signature (Grob*me, String s, int n, int d)
63 Randomly probing the font sucks?
66 SCM alist_chain = Font_interface::font_alist_chain (me);
69 Font_interface::add_style (me, ly_symbol2scm ("timesig-symbol"),
72 Font_metric *feta = Font_interface::get_font (me, style_chain);
75 First guess: s contains only the signature style, append fraction.
77 String symbolname = "timesig-" + s + to_string (n) + "/" + to_string (d);
79 Molecule m = feta->find_by_name (symbolname);
84 Second guess: s contains the full signature name
86 m = feta->find_by_name ("timesig-" + s);
87 m.align_to (X_AXIS, LEFT);
92 If there is no such symbol, we default without warning to the
95 return time_signature (me, n, d);
100 Time_signature::time_signature (Grob*me,int num, int den)
102 SCM chain = Font_interface::font_alist_chain (me);
104 Molecule n = Text_item::text2molecule (me,
105 ly_str02scm (to_string (num).to_str0 ()),
107 Molecule d = Text_item::text2molecule (me,
108 ly_str02scm (to_string (den).to_str0 ()),
110 n.align_to (X_AXIS, CENTER);
111 d.align_to (X_AXIS, CENTER);
115 m.add_at_edge (Y_AXIS, UP, n, 0.0);
116 m.add_at_edge (Y_AXIS, DOWN, d, 0.0);
121 m.align_to (Y_AXIS, CENTER);
124 m.align_to (X_AXIS, LEFT);
131 ADD_INTERFACE (Time_signature,"time-signature-interface",
132 "A time signature, in different styles.
133 The following values for 'style are are recognized:
137 4/4 and 2/2 are typeset as C and struck C, respectively. All
138 other time signatures are written with two digits.
141 2/2, 3/2, 2/4, 3/4, 4/4, 6/4, 9/4, 4/8, 6/8 and 9/8 are
142 typeset with old-style mensuration marks. All other time
143 signatures are written with two digits.
146 All time signatures are typeset with a single
147 digit, e.g. 3/2 is written as 3. (Any symbol starting
148 with the digit @code{1} will do.)
150 @item @code{C}@var{M}@code{/}@var{N},
151 @code{old}@var{M}@code{/}@var{N} or
153 Tells LilyPond to use a specific symbol as time signature,
154 regardless of the actual time signature.
157 See also the test-file @file{input/test/time.ly}.