lily/font-size-engraver.cc

   1 /*
   2   font-size-engraver.cc -- implement Font_size_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2001--2009  Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "grob.hh"
  10 #include "engraver.hh"
  11
  12 class Font_size_engraver : public Engraver
  13 {
  14
  15   TRANSLATOR_DECLARATIONS (Font_size_engraver);
  16 protected:
  17   DECLARE_ACKNOWLEDGER (font);
  18   void process_music ();
  19   Real size;
  20 private:
  21 };
  22
  23 Font_size_engraver::Font_size_engraver ()
  24 {
  25   size = 0.0;
  26 }
  27
  28 void
  29 Font_size_engraver::process_music ()
  30 {
  31   size = robust_scm2double (get_property ("fontSize"), 0.0);
  32 }
  33
  34 void
  35 Font_size_engraver::acknowledge_font (Grob_info gi)
  36 {
  37   /*
  38     We only want to process a grob once.
  39   */
  40   if (!size)
  41     return;
  42
  43   if (gi.context () != context ())
  44     return;
  45
  46   Real font_size = size
  47     + robust_scm2double (gi.grob ()->get_property ("font-size"), 0);
  48   gi.grob ()->set_property ("font-size", scm_from_double (font_size));
  49 }
  50
  51 #include "translator.icc"
  52
  53 ADD_ACKNOWLEDGER (Font_size_engraver, font);
  54 ADD_TRANSLATOR (Font_size_engraver,
  55                 /* doc */
  56                 "Put @code{fontSize} into @code{font-size} grob property.",
  57
  58                 /* create */
  59                 "",
  60
  61                 /* read */
  62                 "fontSize ",
  63
  64                 /* write */
  65                 ""
  66                 );