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--2003 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 "warn.hh"
  14 #include "item.hh"
  15 #include "staff-symbol.hh"
  16 #include "staff-symbol-referencer.hh"
  17 #include "spanner.hh"
  18
  19
  20
  21 MAKE_SCHEME_CALLBACK (Staff_symbol,brew_molecule,1);
  22
  23 SCM
  24 Staff_symbol::brew_molecule (SCM smob)
  25 {
  26   Grob *me = unsmob_grob (smob);
  27   Spanner* sp = dynamic_cast<Spanner*> (me);
  28   Grob * common
  29     = sp->get_bound (LEFT)->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
  30
  31   Real width  = 0.0;
  32
  33   /*
  34     For raggedright without ragged staffs, simply set width to the linewidth.
  35
  36     (ok -- lousy UI, since width is in staff spaces)
  37
  38     --hwn.
  39    */
  40   SCM width_scm = me->get_grob_property ("width");
  41   if (gh_number_p (width_scm))
  42     {
  43
  44       /*
  45         don't multiply by Staff_symbol_referencer::staff_space (me),
  46         since that would make aligning staff symbols of different sizes to
  47         one right margin hell.
  48       */
  49       width = gh_scm2double (width_scm);
  50     }
  51   else
  52     {
  53       width = sp->get_bound (RIGHT)->relative_coordinate (common , X_AXIS);
  54     }
  55
  56   // respect indentation, if any
  57   width -= sp->get_bound (LEFT)->relative_coordinate (common, X_AXIS);
  58
  59   if (width < 0)
  60     {
  61       warning (_f ("staff symbol: indentation yields beyond end of line"));
  62       width = 0;
  63     }
  64
  65   Real t = me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
  66   SCM my_thick = me->get_grob_property("thickness");
  67   if (gh_number_p (my_thick))
  68     t *= gh_scm2double (my_thick);
  69
  70   int l = Staff_symbol::line_count (me);
  71
  72   Real height = (l-1) * staff_space (me) /2;
  73   Molecule m;
  74   for (int i=0; i < l; i++)
  75     {
  76       Molecule a =
  77         Lookup::horizontal_line (Interval (0,width), t);
  78
  79       a.translate_axis (height - i * staff_space (me), Y_AXIS);
  80       m.add_molecule (a);
  81     }
  82
  83   return m.smobbed_copy ();
  84 }
  85
  86 int
  87 Staff_symbol::get_steps (Grob*me)
  88 {
  89   return line_count (me) * 2;
  90 }
  91
  92 int
  93 Staff_symbol::line_count (Grob*me)
  94 {
  95   SCM c = me->get_grob_property ("line-count");
  96   if (gh_number_p (c))
  97     return gh_scm2int (c);
  98   else
  99     return 0;
 100 }
 101
 102 Real
 103 Staff_symbol::staff_space (Grob*me)
 104 {
 105   Real ss = 1.0;
 106
 107   SCM s = me->get_grob_property ("staff-space");
 108   if (gh_number_p (s))
 109     ss *= gh_scm2double (s);
 110   return ss;
 111 }
 112
 113
 114
 115
 116 ADD_INTERFACE (Staff_symbol,"staff-symbol-interface",
 117   "This spanner draws the lines of a staff.  The center (i.e. middle line "
 118 "or space) is position 0. The length of the symbol may be set by hand "
 119 "through the @code{width} property. ",
 120
 121   "width staff-space thickness line-count");
 122