lily/lyric-extender.cc

   1 /*
   2   lyric-extender.cc -- implement Lyric_extender
   3   source file of the GNU LilyPond music typesetter
   4
   5   (c)  1998--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   6   Han-Wen Nienhuys
   7 */
   8
   9
  10 #include "box.hh"
  11 #include "debug.hh"
  12 #include "lookup.hh"
  13 #include "molecule.hh"
  14 #include "paper-column.hh"
  15 #include "paper-def.hh"
  16 #include "lyric-extender.hh"
  17
  18
  19 MAKE_SCHEME_CALLBACK (Lyric_extender,brew_molecule,1)
  20 SCM
  21 Lyric_extender::brew_molecule (SCM smob)
  22 {
  23   Spanner *sp = dynamic_cast<Spanner*> (unsmob_grob (smob));
  24
  25   // ugh: refp
  26   Real leftext = sp->get_bound (LEFT)->extent (sp->get_bound (LEFT),
  27                                                X_AXIS).length ();
  28
  29   Real sl = sp->paper_l ()->get_var ("stafflinethickness");
  30   Real righttrim = 0.5; // default to half a space gap on the right
  31   SCM righttrim_scm = sp->get_grob_property ("right-trim-amount");
  32   if (gh_number_p (righttrim_scm)) {
  33     righttrim = gh_scm2double (righttrim_scm);
  34   }
  35   // The extender can exist in the word space of the left lyric ...
  36   SCM space =  sp->get_bound (LEFT)->get_grob_property ("word-space");
  37   if (gh_number_p (space))
  38     {
  39       leftext -=  gh_scm2double (space);
  40     }
  41   Real w = sp->spanner_length () - leftext - righttrim;
  42
  43   Real h = sl * gh_scm2double (sp->get_grob_property ("height"));
  44   Molecule  mol (Lookup::filledbox (Box (Interval (0,w), Interval (0,h))));
  45   mol.translate (Offset (leftext, 0));
  46   return mol.smobbed_copy ();
  47 }
  48
  49 void
  50 Lyric_extender::set_textitem (Spanner*sp, Direction d, Grob*s)
  51 {
  52   sp->set_bound (d, s);
  53   sp->add_dependency (s);
  54 }
  55
  56