2 note-head-line-engraver.cc -- implement Note_head_line_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2003 Jan Nieuwenhuizen <janneke@gnu.org>
10 #include "group-interface.hh"
15 #include "rhythmic-head.hh"
16 #include "side-position-interface.hh"
17 #include "staff-symbol-referencer.hh"
18 #include "translator-group.hh"
21 Create line-spanner grobs for lines that connect note heads.
23 TODO: have the line commit suicide if the notes are connected with
27 class Note_head_line_engraver
: public Engraver
30 TRANSLATOR_DECLARATIONS(Note_head_line_engraver
);
33 virtual void acknowledge_grob (Grob_info
);
34 virtual void process_acknowledged_grobs ();
35 virtual void stop_translation_timestep ();
39 Translator
* last_staff_
;
45 Note_head_line_engraver::Note_head_line_engraver ()
55 Note_head_line_engraver::acknowledge_grob (Grob_info info
)
57 if (Rhythmic_head::has_interface (info
.grob_
))
60 if (to_boolean (get_property ("followVoice")))
62 Translator_group
* tr
= daddy_trans_
;
63 while (tr
&& !tr
->is_alias_b (ly_symbol2scm ( "Staff")))
64 tr
= tr
->daddy_trans_
;
66 if (tr
&& tr
->is_alias_b (ly_symbol2scm ("Staff")) && tr
!= last_staff_
)
78 Note_head_line_engraver::process_acknowledged_grobs ()
80 if (!line_
&& follow_
&& last_head_
&& head_
)
82 /* TODO: Don't follow if there's a beam.
84 We can't do beam-stuff here, since beam doesn't exist yet.
85 Should probably store follow_ in line_, and suicide at some
88 line_
= new Spanner (get_property ("VoiceFollower"));
90 line_
->set_bound (LEFT
, last_head_
);
91 line_
->set_bound (RIGHT
, head_
);
93 announce_grob(line_
, head_
->self_scm ());
100 Note_head_line_engraver::stop_translation_timestep ()
104 typeset_grob (line_
);
115 ENTER_DESCRIPTION(Note_head_line_engraver
,
116 /* descr */ "Engrave a line between two note heads, for example a glissando. If "
117 " followVoice is set, staff switches also generate a line.",
118 /* creats*/ "Glissando VoiceFollower",
119 /* accepts */ "glissando-event",
120 /* acks */ "rhythmic-head-interface",
121 /* reads */ "followVoice",