2 custos-engraver.cc -- implement Custos_engraver
4 source file of the GNU LilyPond music typesetter
6 (C) 2000 Juergen Reuter <reuterj@ira.uka.de>,
8 Han-Wen Nienhuys <hanwen@cs.uu.nl>
12 #include "engraver.hh"
13 #include "bar-line.hh"
15 #include "note-head.hh"
16 #include "staff-symbol-referencer.hh"
21 This class implements an engraver for custos symbols.
23 class Custos_engraver : public Engraver
26 TRANSLATOR_DECLARATIONS( Custos_engraver);
27 virtual void start_translation_timestep ();
28 virtual void acknowledge_grob (Grob_info);
29 virtual void process_acknowledged_grobs ();
30 virtual void stop_translation_timestep ();
31 virtual void finalize ();
35 Item * create_custos ();
36 bool custos_permitted;
37 Link_array<Grob> custodes_;
38 Array<Pitch> pitches_;
41 Custos_engraver::Custos_engraver ()
43 custos_permitted = false;
48 Custos_engraver::stop_translation_timestep ()
51 delay typeset until we're at the next moment, so we can silence custodes at the end of the piece.
56 Custos_engraver::start_translation_timestep ()
58 for (int i = custodes_.size (); i--;)
60 typeset_grob (custodes_[i]);
65 custos_permitted = false;
70 Custos_engraver::acknowledge_grob (Grob_info info)
72 Item *item = dynamic_cast <Item *> (info.grob_);
75 Music * m = info.music_cause();
76 if (Bar_line::has_interface (info.grob_))
77 custos_permitted = true;
78 else if (Note_head::has_interface (info.grob_)
80 && m->is_mus_type ("note-event"))
84 ideally, we'd do custos->set_parent (Y_AXIS, notehead),
85 but since the note head lives on the other system, we can't
87 So we copy the position from the note head pitch. We
88 don't look at the staff-position, since we can't be sure
89 whether Clef_engraver already applied a vertical shift.
91 pitches_.push (*unsmob_pitch (m->get_mus_property ("pitch")));
97 Custos_engraver::process_acknowledged_grobs ()
99 if (gh_string_p (get_property ("whichBar")))
100 custos_permitted = true;
102 if (custos_permitted)
104 for (int i = pitches_.size (); i--;)
106 Item *c = create_custos ();
108 int p = pitches_[i].steps ();
109 SCM c0 = get_property ("centralCPosition");
110 if (gh_number_p (c0))
111 p += gh_scm2int (c0);
114 c->set_grob_property ("staff-position",
124 Custos_engraver::create_custos ()
126 SCM basicProperties = get_property ("Custos");
127 Item* custos = new Item (basicProperties);
129 announce_grob(custos, SCM_EOL);
130 custodes_.push (custos);
136 Custos_engraver::finalize ()
138 for (int i = custodes_.size (); i--;)
140 custodes_[i]->suicide ();
141 typeset_grob (custodes_[i]);
148 ENTER_DESCRIPTION(Custos_engraver,
150 /* creats*/ "Custos",
152 /* acks */ "bar-line-interface note-head-interface",