* Documentation/user/tutorial.itely: Revised (continued).

[lilypond.git] / lily / font-size-engraver.cc

diff --git a/lily/font-size-engraver.cc b/lily/font-size-engraver.cc
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..9066bee1f6132c4f8f200d8d19beaaf7158cc83c 100644 (file)
--- a/lily/font-size-engraver.cc
+++ b/lily/font-size-engraver.cc
@@ -0,0 +1,55 @@
+/*   
+  font-size-engraver.cc --  implement Font_size_engraver
+  
+  source file of the GNU LilyPond music typesetter
+  
+  (c) 2001--2004  Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  
+ */
+
+#include "grob.hh"
+#include "engraver.hh"
+
+class Font_size_engraver : public Engraver
+{
+  
+  TRANSLATOR_DECLARATIONS (Font_size_engraver);
+protected:
+  virtual void acknowledge_grob (Grob_info gi);
+private:
+};
+
+
+Font_size_engraver::Font_size_engraver ()
+{
+
+}
+
+void
+Font_size_engraver::acknowledge_grob (Grob_info gi)
+{
+  SCM sz = get_property ("fontSize");
+
+  /*
+    We only want to process a grob once.
+   */
+  if (gi.origin_trans_->daddy_context_ != daddy_context_)
+    return ;
+  
+  if (gh_number_p (sz) && gh_scm2double (sz))
+    {
+      Real font_size = gh_scm2double (sz);
+      
+      font_size +=  robust_scm2double (gi.grob_->get_property ("font-size"), 0);
+      gi.grob_->set_property ("font-size", gh_double2scm (font_size));
+    }
+}
+
+
+ENTER_DESCRIPTION (Font_size_engraver,
+/* descr */       "Puts fontSize into font-relative-size grob property.",
+/* creats*/       "",
+/* accepts */     "",
+/* acks  */      "font-interface",
+/* reads */       "fontSize",
+/* write */       "");