2 note-head-line-engraver.cc -- implement Note_head_line_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2002 Jan Nieuwenhuizen <janneke@gnu.org>
10 #include "group-interface.hh"
12 #include "musical-request.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 create_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)
66 if (Glissando_req *r = dynamic_cast<Glissando_req*> (m))
76 Note_head_line_engraver::acknowledge_grob (Grob_info info)
78 if (Rhythmic_head::has_interface (info.grob_l_))
81 if (to_boolean (get_property ("followVoice")))
83 Translator_group * tr = daddy_trans_l_;
84 while (tr && tr->type_str_ != "Staff")
85 tr = tr->daddy_trans_l_ ;
87 if (tr && tr->type_str_ == "Staff" && tr != last_staff_)
99 Note_head_line_engraver::create_grobs ()
101 if (!line_ && (follow_ || last_req_) && last_head_ && head_
102 && (last_head_ != head_))
104 /* TODO: Don't follow if there's a beam.
106 We can't do beam-stuff here, since beam doesn't exist yet.
107 Should probably store follow_ in line_, and suicide at some
110 line_ = new Spanner (get_property ("VoiceFollower"));
112 line_ = new Spanner (get_property ("Glissando"));
114 line_->set_bound (LEFT, last_head_);
115 line_->set_bound (RIGHT, head_);
117 /* Note, mustn't set y-parent of breakable symbol to simple item:
118 one of the two broken parts won't have an y-parent! */
119 /* X parent is set by set_bound */
120 line_->set_parent (Staff_symbol_referencer::staff_symbol_l (last_head_),
123 SCM c = last_req_? last_req_->self_scm () : SCM_EOL;
124 announce_grob(line_, c);
132 Note_head_line_engraver::stop_translation_timestep ()
136 typeset_grob (line_);
153 ENTER_DESCRIPTION(Note_head_line_engraver,
154 /* descr */ "Engrave a line between two note heads, for example a glissando.
155 If followVoice is set, staff switches also generate a line.",
156 /* creats*/ "Glissando VoiceFollower",
157 /* acks */ "rhythmic-head-interface",
158 /* reads */ "followVoice",