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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 #include "molecule.hh"
  12 #include "time-signature.hh"
  13 #include "paper-def.hh"
  14 #include "lookup.hh"
  15
  16 MAKE_SCHEME_CALLBACK(Time_signature,brew_molecule);
  17
  18 SCM
  19 Time_signature::brew_molecule (SCM smob)
  20 {
  21   Score_element * me = unsmob_element (smob);
  22   SCM st = me->get_elt_property ("style");
  23   SCM frac = me->get_elt_property ("fraction");
  24   int n = 4;
  25   int d = 4;
  26   if (gh_pair_p (frac))
  27     {
  28       n = gh_scm2int (gh_car (frac));
  29       d = gh_scm2int (gh_cdr (frac));
  30     }
  31
  32
  33   if (gh_string_p (st))
  34     {
  35       String style (ly_scm2string (st));
  36       if (style[0]=='1')
  37         {
  38           return time_signature (me, n, 0).create_scheme();
  39         }
  40       else
  41         {
  42           return special_time_signature (me, style, n, d).create_scheme();
  43         }
  44     }
  45   else
  46     return time_signature (me, n,d).create_scheme();
  47 }
  48
  49 Molecule
  50 Time_signature::special_time_signature (Score_element*me, String s, int n, int d)
  51 {
  52   // First guess: s contains only the signature style
  53   String symbolname = "timesig-" + s + to_str (n) + "/" + to_str (d);
  54
  55   Molecule m = me->lookup_l ()->afm_find (symbolname, false);
  56   if (!m.empty_b())
  57     return m;
  58
  59   // Second guess: s contains the full signature name
  60   m = me->lookup_l ()->afm_find ("timesig-"+s, false);
  61   if (!m.empty_b ())
  62     return m;
  63
  64   // Resort to default layout with numbers
  65   return time_signature (me, n,d);
  66 }
  67
  68
  69 Molecule
  70 Time_signature::time_signature (Score_element*me,int num, int den)
  71 {
  72   String sty = "timesig";
  73
  74   /*
  75     UGH: need to look at fontsize.
  76    */
  77   Molecule n (me->lookup_l ()->text (sty, to_str (num), me->paper_l ()));
  78   Molecule d (me->lookup_l ()->text (sty, to_str (den), me->paper_l ()));
  79   n.align_to (X_AXIS, CENTER);
  80   d.align_to (X_AXIS, CENTER);
  81   Molecule m;
  82   if (den)
  83     {
  84       m.add_at_edge (Y_AXIS, UP, n, 0.0);
  85       m.add_at_edge (Y_AXIS, DOWN, d, 0.0);
  86     }
  87   else
  88     {
  89       m = n;
  90       m.align_to (Y_AXIS, CENTER);
  91     }
  92   return m;
  93 }
  94