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--2004  Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "grob.hh"
  11 #include "engraver.hh"
  12
  13 class Font_size_engraver : public Engraver
  14 {
  15
  16   TRANSLATOR_DECLARATIONS (Font_size_engraver);
  17 protected:
  18   virtual void acknowledge_grob (Grob_info gi);
  19 private:
  20 };
  21
  22
  23 Font_size_engraver::Font_size_engraver ()
  24 {
  25
  26 }
  27
  28 void
  29 Font_size_engraver::acknowledge_grob (Grob_info gi)
  30 {
  31   SCM sz = get_property ("fontSize");
  32
  33   /*
  34     We only want to process a grob once.
  35    */
  36   if (gi.origin_trans_->daddy_context_ != daddy_context_)
  37     return ;
  38
  39   if (gh_number_p (sz) && gh_scm2double (sz))
  40     {
  41       Real font_size = gh_scm2double (sz);
  42
  43       font_size +=  robust_scm2double (gi.grob_->get_property ("font-size"), 0);
  44       gi.grob_->set_property ("font-size", gh_double2scm (font_size));
  45     }
  46 }
  47
  48
  49 ENTER_DESCRIPTION (Font_size_engraver,
  50 /* descr */       "Puts fontSize into font-relative-size grob property.",
  51 /* creats*/       "",
  52 /* accepts */     "",
  53 /* acks  */      "font-interface",
  54 /* reads */       "fontSize",
  55 /* write */       "");