lily/rest.cc

   1 /*
   2  rest.cc -- implement Rest
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "molecule.hh"
  10 #include "paper-def.hh"
  11 #include "font-interface.hh"
  12 #include "rest.hh"
  13 #include "dots.hh"
  14 #include "paper-score.hh"
  15 #include "staff-symbol-referencer.hh"
  16
  17 // -> offset callback
  18 MAKE_SCHEME_CALLBACK (Rest,after_line_breaking,1);
  19 SCM
  20 Rest::after_line_breaking (SCM smob)
  21 {
  22   Grob *me = unsmob_grob (smob);
  23   int bt = gh_scm2int (me->get_grob_property ("duration-log"));
  24   if (bt == 0)
  25     {
  26       me->translate_axis (Staff_symbol_referencer::staff_space (me) , Y_AXIS);
  27     }
  28
  29   Grob * d = unsmob_grob (me->get_grob_property ("dot"));
  30   if (d && bt > 4) // UGH.
  31     {
  32       d->set_grob_property ("staff-position",
  33                            gh_int2scm ((bt == 7) ? 4 : 3));
  34     }
  35
  36   return SCM_UNSPECIFIED;
  37 }
  38
  39 /*
  40   make this function easily usable in C++
  41  */
  42
  43 String
  44 Rest::glyph_name (Grob * me, int balltype, String style)
  45 {
  46   bool ledger_b =false;
  47
  48   if (balltype == 0 || balltype == 1)
  49     {
  50       Real rad = Staff_symbol_referencer::staff_radius (me) * 2.0;
  51       Real pos = Staff_symbol_referencer::position_f (me);
  52
  53       /*
  54         Figure out when the rest is far enough outside the staff. This
  55         could bemore generic, but hey, we understand this even after
  56         dinner.
  57
  58        */
  59       ledger_b = ledger_b || (balltype == 0 && (pos >= rad +2   || pos < -rad ));
  60       ledger_b = ledger_b || (balltype == 1 &&
  61                               (pos  <= -rad -2 || pos > rad));
  62     }
  63
  64   return ("rests-") + to_str (balltype)
  65     + (ledger_b ? "o" : "") + style;
  66 }
  67
  68
  69
  70
  71 MAKE_SCHEME_CALLBACK (Rest,brew_molecule,1);
  72
  73 SCM
  74 Rest::brew_internal_molecule (SCM smob)
  75 {
  76   Grob* me = unsmob_grob (smob);
  77
  78   SCM balltype_scm = me->get_grob_property ("duration-log");
  79   if (!gh_number_p (balltype_scm))
  80     return Molecule ().smobbed_copy ();
  81   int balltype = gh_scm2int (balltype_scm);
  82
  83   String style;
  84   SCM style_sym =me->get_grob_property ("style");
  85   if (balltype >= 2 && gh_symbol_p (style_sym))
  86     {
  87       style = ly_scm2string (scm_symbol_to_string (style_sym));
  88     }
  89
  90   String idx = glyph_name (me, balltype, style);
  91   return Font_interface::get_default_font (me)->find_by_name (idx).smobbed_copy ();
  92 }
  93
  94 SCM
  95 Rest::brew_molecule (SCM smob)
  96 {
  97   return brew_internal_molecule (smob);
  98 }
  99 MAKE_SCHEME_CALLBACK (Rest,extent_callback,2);
 100 /*
 101   We need the callback. The real molecule has ledgers depending on
 102   Y-position. The Y-position is known only after line breaking.  */
 103 SCM
 104 Rest::extent_callback (SCM smob, SCM ax)
 105 {
 106   Axis a = (Axis) gh_scm2int (ax);
 107   SCM m = brew_internal_molecule (smob);
 108   return ly_interval2scm (unsmob_molecule (m)->extent (a));
 109 }
 110
 111 bool
 112 Rest::has_interface (Grob*m)
 113 {
 114   return m && m->has_interface (ly_symbol2scm ("rest-interface"));
 115 }