lily/sustain-pedal.cc

   1 /*
   2   sustain-pedal.cc --  implement Sustain_pedal
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include "grob.hh"
  10 #include "molecule.hh"
  11 #include "font-interface.hh"
  12 #include "string.hh"
  13
  14 // update comment --hwn
  15 /*
  16   Urg.
  17   This is almost text
  18   Problem is:
  19     * we have no kerning
  20     * symbols are at wrong place in font
  21
  22
  23
  24   Properties:
  25
  26   glyph -- text string (TODO: make one large glyph of the Ped symbol, removes need for member_brew_molecule ())
  27
  28 */
  29
  30 struct Sustain_pedal
  31 {
  32 public:
  33   DECLARE_SCHEME_CALLBACK (brew_molecule, (SCM));
  34 };
  35
  36
  37 MAKE_SCHEME_CALLBACK (Sustain_pedal,brew_molecule,1);
  38 SCM
  39 Sustain_pedal::brew_molecule (SCM smob)
  40 {
  41   Grob * e = unsmob_grob (smob);
  42
  43   Molecule mol;
  44   SCM glyph = e->get_grob_property ("text");
  45   if (!gh_string_p (glyph))
  46     return mol.smobbed_copy ();
  47
  48   String text = ly_scm2string (glyph);
  49
  50   for (int i = 0; i < text.length (); i++)
  51     {
  52       String idx ("pedal-");
  53       if (text.cut_string (i, 3) == "Ped")
  54         {
  55           idx += "Ped";
  56           i += 2;
  57         }
  58       else
  59         idx += String (&text.to_bytes ()[i], 1);
  60       Molecule m = Font_interface::get_default_font (e)->find_by_name (idx);
  61       if (!m.empty_b ())
  62         mol.add_at_edge (X_AXIS, RIGHT, m, 0, 0);
  63     }
  64
  65   return mol.smobbed_copy ();
  66 }
  67