lily/rest.cc

   1 /*
   2  rest.cc -- implement Rest
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 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_SCHEME_CALLBACK(Rest,brew_molecule,1);
  41
  42 SCM
  43 Rest::brew_internal_molecule (SCM smob)
  44 {
  45   Grob* me = unsmob_grob (smob);
  46
  47   bool ledger_b =false;
  48
  49   SCM balltype = me->get_grob_property ("duration-log");
  50
  51   if (balltype == gh_int2scm (0) || balltype == gh_int2scm (1))
  52     {
  53       int sz = Staff_symbol_referencer::line_count (me);
  54       Real dif = abs(Staff_symbol_referencer::position_f (me)  - (2* gh_scm2int (balltype) - 1));
  55       ledger_b = dif > sz;
  56     }
  57
  58   String style;
  59   SCM style_sym =me->get_grob_property ("style");
  60   if (gh_scm2int (balltype) >= 2 && gh_symbol_p (style_sym))
  61     {
  62       style = ly_scm2string (scm_symbol_to_string (style_sym));
  63     }
  64
  65   String idx =  ("rests-") + to_str (gh_scm2int (balltype))
  66     + (ledger_b ? "o" : "") + style;
  67
  68   return Font_interface::get_default_font (me)->find_by_name (idx).smobbed_copy();
  69 }
  70
  71 SCM
  72 Rest::brew_molecule (SCM smob)
  73 {
  74   return brew_internal_molecule (smob);
  75 }
  76 MAKE_SCHEME_CALLBACK(Rest,extent_callback,2);
  77 /*
  78   We need the callback. The real molecule has ledgers depending on
  79   Y-position. The Y-position is known only after line breaking.  */
  80 SCM
  81 Rest::extent_callback (SCM smob, SCM ax)
  82 {
  83   Axis a = (Axis) gh_scm2int (ax);
  84   SCM m = brew_internal_molecule (smob);
  85   return ly_interval2scm (unsmob_molecule (m)->extent (a));
  86 }
  87
  88 bool
  89 Rest::has_interface (Grob*m)
  90 {
  91   return m && m->has_interface (ly_symbol2scm ("rest-interface"));
  92 }