+
+ stem->set_property ("duration-log",
+ scm_from_int (durlog));
+ Moment stem_location = now - beam_start_mom_ + beam_start_location_;
+ beam_info_->add_stem (stem_location,
+ max (durlog- 2, 0),
+ Stem::is_invisible (stem));
+ Beam::add_stem (beam_, stem);
+}
+
+ADD_ACKNOWLEDGER (Beam_engraver, stem);
+ADD_ACKNOWLEDGER (Beam_engraver, rest);
+
+ADD_TRANSLATOR (Beam_engraver,
+ /* doc */
+ "Handle @code{Beam} events by engraving beams. If omitted,"
+ " then notes are printed with flags instead of beams.",
+
+ /* create */
+ "Beam ",
+
+ /* read */
+ "beamMelismaBusy "
+ "beatLength "
+ "subdivideBeams ",
+
+ /* write */
+ "forbidBreak"
+ );
+
+class Grace_beam_engraver : public Beam_engraver
+{
+public:
+ TRANSLATOR_DECLARATIONS (Grace_beam_engraver);
+
+ DECLARE_TRANSLATOR_LISTENER (beam);
+
+protected:
+ virtual bool valid_start_point ();
+ virtual bool valid_end_point ();
+};
+
+Grace_beam_engraver::Grace_beam_engraver ()
+{
+}
+
+bool
+Grace_beam_engraver::valid_start_point ()
+{
+ Moment n = now_mom ();
+
+ return n.grace_part_ != Rational (0);
+}
+
+bool
+Grace_beam_engraver::valid_end_point ()
+{
+ return beam_ && valid_start_point ();