lily/time-signature.cc

   1 /*
   2   time-signature.cc -- implement Time_signature
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "time-signature.hh"
  10
  11 #include "grob.hh"
  12 #include "font-interface.hh"
  13 #include "international.hh"
  14 #include "output-def.hh"
  15 #include "staff-symbol-referencer.hh"
  16 #include "text-interface.hh"
  17 #include "warn.hh"
  18
  19 /*
  20   TODO:
  21
  22   this file should go ; The formatting can completely be done with
  23   markups.
  24 */
  25
  26 MAKE_SCHEME_CALLBACK (Time_signature, print, 1);
  27 SCM
  28 Time_signature::print (SCM smob)
  29 {
  30   Grob *me = unsmob_grob (smob);
  31   SCM st = me->get_property ("style");
  32   SCM frac = me->get_property ("fraction");
  33   int n = 4;
  34   int d = 4;
  35   if (scm_is_pair (frac))
  36     {
  37       n = scm_to_int (scm_car (frac));
  38       d = scm_to_int (scm_cdr (frac));
  39     }
  40
  41   Stencil m;
  42   if (st == ly_symbol2scm ("single-digit"))
  43     m = numbered_time_signature (me, n, 0);
  44   else if (scm_is_symbol (st))
  45     m = special_time_signature (me, st, n, d);
  46   else
  47     m = numbered_time_signature (me, n, d);
  48
  49   if (Staff_symbol_referencer::line_count (me) % 2 == 0)
  50     m.translate_axis (Staff_symbol_referencer::staff_space (me) / 2, Y_AXIS);
  51
  52   return m.smobbed_copy ();
  53 }
  54
  55 Stencil
  56 Time_signature::special_time_signature (Grob *me, SCM scm_style, int n, int d)
  57 {
  58   string style = ly_scm2string (scm_symbol_to_string (scm_style));
  59
  60   if (style == "numbered")
  61     return numbered_time_signature (me, n, d);
  62
  63   if ((style == "default") || (style == ""))
  64     style = to_string ("C");
  65
  66   if (style == "C")
  67     {
  68       if /* neither C2/2 nor C4/4 */
  69         (((n != 2) || (d != 2))
  70          && ((n != 4) || (d != 4)))
  71         return numbered_time_signature (me, n, d);
  72     }
  73
  74   string char_name = style + to_string (n) + to_string (d);
  75   me->set_property ("font-encoding", ly_symbol2scm ("fetaMusic"));
  76   Stencil out = Font_interface::get_default_font (me)
  77     ->find_by_name ("timesig." + char_name);
  78   if (!out.is_empty ())
  79     return out;
  80
  81   /* If there is no such symbol, we default to the numbered style.
  82      (Here really with a warning!) */
  83   me->warning (_f ("time signature symbol `%s' not found; "
  84                    "reverting to numbered style", char_name));
  85   return numbered_time_signature (me, n, d);
  86 }
  87
  88 Stencil
  89 Time_signature::numbered_time_signature (Grob *me, int num, int den)
  90 {
  91   SCM chain = me->get_property_alist_chain (Font_interface::text_font_alist_chain (me));
  92   chain = scm_cons (scm_list_1 (scm_cons (ly_symbol2scm ("font-encoding"),
  93                                           ly_symbol2scm ("fetaNumber"))),
  94                     chain);
  95
  96   SCM sn = Text_interface::interpret_markup (me->layout ()->self_scm (), chain,
  97                                              ly_string2scm (to_string (num)));
  98   SCM sd = Text_interface::interpret_markup (me->layout ()->self_scm (), chain,
  99                                              ly_string2scm (to_string (den)));
 100
 101   Stencil n = *unsmob_stencil (sn);
 102   Stencil d = *unsmob_stencil (sd);
 103
 104   n.align_to (X_AXIS, CENTER);
 105   d.align_to (X_AXIS, CENTER);
 106   Stencil m;
 107   if (den)
 108     {
 109       m.add_at_edge (Y_AXIS, UP, n, 0.0);
 110       m.add_at_edge (Y_AXIS, DOWN, d, 0.0);
 111     }
 112   else
 113     {
 114       m = n;
 115       m.align_to (Y_AXIS, CENTER);
 116     }
 117
 118   m.align_to (X_AXIS, LEFT);
 119
 120   return m;
 121 }
 122
 123 ADD_INTERFACE (Time_signature,
 124                "A time signature, in different styles.  The following values"
 125                " for @code{style} are are recognized:\n"
 126                "\n"
 127                "@table @code\n"
 128                "@item C\n"
 129                "4/4 and 2/2 are typeset as C and struck C, respectively."
 130                "  All other time signatures are written with two digits."
 131                "  The value @code{default} is equivalent to @code{C}.\n"
 132                "@item neomensural\n"
 133                "2/2, 3/2, 2/4, 3/4, 4/4, 6/4, 9/4, 4/8, 6/8, and 9/8 are"
 134                " typeset with neo-mensural style mensuration marks.  All"
 135                " other time signatures are written with two digits.\n"
 136                "@item mensural\n"
 137                "2/2, 3/2, 2/4, 3/4, 4/4, 6/4, 9/4, 4/8, 6/8, and 9/8 are"
 138                " typeset with mensural style mensuration marks.  All other"
 139                " time signatures are written with two digits.\n"
 140                "@item single-digit\n"
 141                "All time signatures are typeset with a single digit, e.g.,"
 142                " 3/2 is written as 3.\n"
 143                "@item numbered\n"
 144                "All time signatures are typeset with two digits.\n"
 145                "@end table",
 146
 147                /* properties */
 148                "fraction "
 149                "style "
 150                );