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 glissandi (and possibly other) lines
22 that connect note heads.
25 TODO: have the line commit suicide if the notes are connected with
29 class Note_head_line_engraver : public Engraver
32 TRANSLATOR_DECLARATIONS(Note_head_line_engraver);
35 virtual void acknowledge_grob (Grob_info);
36 virtual void process_acknowledged_grobs ();
37 virtual void stop_translation_timestep ();
38 virtual bool try_music (Music *);
44 Translator* last_staff_;
50 Note_head_line_engraver::Note_head_line_engraver ()
62 Note_head_line_engraver::try_music (Music* m)
73 Note_head_line_engraver::acknowledge_grob (Grob_info info)
75 if (Rhythmic_head::has_interface (info.grob_))
78 if (to_boolean (get_property ("followVoice")))
80 Translator_group * tr = daddy_trans_;
81 while (tr && tr->type_string_ != "Staff")
82 tr = tr->daddy_trans_ ;
84 if (tr && tr->type_string_ == "Staff" && tr != last_staff_)
96 Note_head_line_engraver::process_acknowledged_grobs ()
98 if (!line_ && (follow_ || last_req_) && last_head_ && head_
99 && (last_head_ != head_))
101 /* TODO: Don't follow if there's a beam.
103 We can't do beam-stuff here, since beam doesn't exist yet.
104 Should probably store follow_ in line_, and suicide at some
107 line_ = new Spanner (get_property ("VoiceFollower"));
109 line_ = new Spanner (get_property ("Glissando"));
111 line_->set_bound (LEFT, last_head_);
112 line_->set_bound (RIGHT, head_);
114 /* Note, mustn't set y-parent of breakable symbol to simple item:
115 one of the two broken parts won't have an y-parent! */
116 /* X parent is set by set_bound */
117 line_->set_parent (Staff_symbol_referencer::get_staff_symbol (last_head_),
120 SCM c = last_req_? last_req_->self_scm () : SCM_EOL;
121 announce_grob(line_, c);
129 Note_head_line_engraver::stop_translation_timestep ()
133 typeset_grob (line_);
150 ENTER_DESCRIPTION(Note_head_line_engraver,
151 /* descr */ "Engrave a line between two note heads, for example a glissando. If "
152 " followVoice is set, staff switches also generate a line.",
153 /* creats*/ "Glissando VoiceFollower",
154 /* accepts */ "glissando-event",
155 /* acks */ "rhythmic-head-interface",
156 /* reads */ "followVoice",