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--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 #include "molecule.hh"
  12 #include "text-item.hh"
  13 #include "time-signature.hh"
  14 #include "paper-def.hh"
  15 #include "font-interface.hh"
  16 #include "warn.hh"
  17 #include "staff-symbol-referencer.hh"
  18
  19 MAKE_SCHEME_CALLBACK (Time_signature, brew_molecule, 1);
  20 /* TODO: make different functions for special and normal timesigs. */
  21 SCM
  22 Time_signature::brew_molecule (SCM smob)
  23 {
  24   Grob * me = unsmob_grob (smob);
  25   SCM st = me->get_grob_property ("style");
  26   SCM frac = me->get_grob_property ("fraction");
  27   int n = 4;
  28   int d = 4;
  29   if (gh_pair_p (frac))
  30     {
  31       n = gh_scm2int (ly_car (frac));
  32       d = gh_scm2int (ly_cdr (frac));
  33     }
  34
  35   Molecule m;
  36   if (gh_symbol_p (st))
  37     {
  38       String style (ly_scm2string (scm_symbol_to_string (st)));
  39       if (style[0]=='1')
  40         {
  41           m = numbered_time_signature (me, n, 0);
  42         }
  43       else
  44         {
  45           m = special_time_signature (me, st, n, d);
  46         }
  47     }
  48   else
  49     m = numbered_time_signature (me, n,d);
  50
  51   if (Staff_symbol_referencer::line_count (me) % 2 == 0)
  52     m.translate_axis (Staff_symbol_referencer::staff_space (me)/2 , Y_AXIS);
  53
  54   return m.smobbed_copy ();
  55 }
  56
  57 Molecule
  58 Time_signature::special_time_signature (Grob *me, SCM scm_style, int n, int d)
  59 {
  60   String style = ly_scm2string (scm_symbol_to_string (scm_style));
  61
  62   if (style == "numbered")
  63     return numbered_time_signature (me, n, d);
  64
  65   if ((style == "default") || (style == ""))
  66     style = to_string ("C");
  67
  68   if (style == "C")
  69     {
  70       if /* neither C2/2 nor C4/4 */
  71         (((n != 2) || (d != 2)) &&
  72          ((n != 4) || (d != 4)))
  73         {
  74           return numbered_time_signature (me, n, d);
  75         }
  76     }
  77
  78   String char_name = style + to_string (n) + "/" + to_string (d);
  79   me->set_grob_property ("font-family", ly_symbol2scm ("music"));
  80   Molecule out = Font_interface::get_default_font (me)
  81     ->find_by_name ("timesig-" + char_name);
  82   if (!out.empty_b ())
  83     return out;
  84
  85   /* If there is no such symbol, we default to the numbered style.
  86     (Here really with a warning!) */
  87   me->warning (_f ("time signature symbol `%s' not found; "
  88                    "reverting to numbered style", char_name));
  89   return numbered_time_signature (me, n, d);
  90 }
  91
  92 Molecule
  93 Time_signature::numbered_time_signature (Grob*me,int num, int den)
  94 {
  95   SCM chain = Font_interface::font_alist_chain (me);
  96   me->set_grob_property ("font-family", ly_symbol2scm ("number"));
  97
  98   Molecule n =
  99     Text_item::text2molecule (me, scm_makfrom0str (to_string (num).to_str0 ()),
 100                               chain);
 101   Molecule d =
 102     Text_item::text2molecule (me, scm_makfrom0str (to_string (den).to_str0 ()),
 103                               chain);
 104   n.align_to (X_AXIS, CENTER);
 105   d.align_to (X_AXIS, CENTER);
 106   Molecule m;
 107   if (den)
 108     {
 109       m.add_at_edge (Y_AXIS, UP, n, 0.0, 0);
 110       m.add_at_edge (Y_AXIS, DOWN, d, 0.0,0);
 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, "time-signature-interface",
 124   "A time signature, in different styles.\n"
 125 "  The following values for 'style are are recognized:\n"
 126 "\n"
 127 "    @table @samp\n"
 128 "      @item @code{C}\n"
 129 "        4/4 and 2/2 are typeset as C and struck C, respectively.  All\n"
 130 "        other time signatures are written with two digits.\n"
 131 "\n"
 132 "      @item @code{neo_mensural}\n"
 133 "        2/2, 3/2, 2/4, 3/4, 4/4, 6/4, 9/4, 4/8, 6/8 and 9/8 are\n"
 134 "        typeset with neo-mensural style mensuration marks.  All other time\n"
 135 "        signatures are written with two digits.\n"
 136 "\n"
 137 "      @item @code{mensural}\n"
 138 "        2/2, 3/2, 2/4, 3/4, 4/4, 6/4, 9/4, 4/8, 6/8 and 9/8 are\n"
 139 "        typeset with mensural style mensuration marks.  All other time\n"
 140 "        signatures are written with two digits.\n"
 141 "\n"
 142 "      @item @code{1xxx}\n"
 143 "        All time signatures are typeset with a single\n"
 144 "        digit, e.g. 3/2 is written as 3. (Any symbol starting\n"
 145 "       with the digit @code{1} will do.)\n"
 146 "    @end table\n"
 147 "\n"
 148 "See also the test-file @file{input/test/time.ly}.\n",
 149   "fraction style");