lily/staff-symbol.cc

   1 /*
   2   staff-symbol.cc -- implement Staff_symbol
   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 "lookup.hh"
  10 #include "dimensions.hh"
  11 #include "paper-def.hh"
  12 #include "molecule.hh"
  13 #include "debug.hh"
  14 #include "item.hh"
  15 #include "staff-symbol.hh"
  16 #include "spanner.hh"
  17
  18
  19
  20 MAKE_SCHEME_CALLBACK (Staff_symbol,brew_molecule,1);
  21
  22 SCM
  23 Staff_symbol::brew_molecule (SCM smob)
  24 {
  25   Grob *me = unsmob_grob (smob);
  26   Spanner* sp = dynamic_cast<Spanner*> (me);
  27   Grob * common
  28     = sp->get_bound (LEFT)->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
  29
  30   Real width =
  31     // right_shift     - left_shift
  32     + sp->get_bound (RIGHT)->relative_coordinate (common , X_AXIS)
  33     - sp->get_bound (LEFT)->relative_coordinate (common, X_AXIS)
  34     ;
  35
  36   Real t = me->paper_l ()->get_var ("stafflinethickness");
  37   int l = Staff_symbol::line_count (me);
  38
  39   Real height = (l-1) * staff_space (me) /2;
  40   Molecule m;
  41   for (int i=0; i < l; i++)
  42     {
  43       Molecule a =
  44         Lookup::filledbox (Box (Interval (0,width),
  45                                          Interval (-t/2, t/2)));
  46
  47       a.translate_axis (height - i * staff_space (me), Y_AXIS);
  48       m.add_molecule (a);
  49     }
  50
  51   return m.smobbed_copy ();
  52 }
  53
  54 int
  55 Staff_symbol::steps_i (Grob*me)
  56 {
  57   return line_count (me) * 2;
  58 }
  59
  60 int
  61 Staff_symbol::line_count (Grob*me)
  62 {
  63   SCM c = me->get_grob_property ("line-count");
  64   if (gh_number_p (c))
  65     return gh_scm2int (c);
  66   else
  67     return 0;
  68 }
  69
  70 Real
  71 Staff_symbol::staff_space (Grob*me)
  72 {
  73   Real ss = 1.0;
  74
  75   SCM s = me->get_grob_property ("staff-space");
  76   if (gh_number_p (s))
  77     ss *= gh_scm2double (s);
  78   return ss;
  79 }
  80
  81 bool
  82 Staff_symbol::has_interface (Grob*m)
  83 {
  84   return m && m->has_interface (ly_symbol2scm ("staff-symbol-interface"));
  85 }