2 key-performer.cc -- implement Key_performer
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 Jan Nieuwenhuizen <janneke@gnu.org>
9 #include "lily-guile.hh"
10 #include "command-request.hh"
11 #include "audio-item.hh"
12 #include "performer.hh"
16 class Key_performer
: public Performer
19 TRANSLATOR_DECLARATIONS(Key_performer
);
23 virtual bool try_music (Music
* req
);
24 virtual void create_audio_elements ();
25 virtual void stop_translation_timestep ();
28 Key_change_req
* key_req_
;
32 Key_performer::Key_performer ()
38 Key_performer::~Key_performer ()
43 Key_performer::create_audio_elements ()
47 SCM pitchlist
= key_req_
->get_mus_property ("pitch-alist");
48 SCM proc
= scm_primitive_eval (ly_symbol2scm ("accidentals-in-key"));
49 SCM acc
= gh_call1 (proc
, pitchlist
);
50 proc
= scm_primitive_eval (ly_symbol2scm ("major-key"));
53 gh_scm2int (ly_caar (pitchlist
)),
54 gh_scm2int (ly_cdar (pitchlist
)));
57 (7 - gh_scm2int (ly_caar (pitchlist
))) % 7,
58 -gh_scm2int (ly_cdar (pitchlist
)));
60 my_do
.transpose (to_c
);
61 to_c
.alteration_
-= my_do
.alteration_
;
63 Key_change_req
*key
= new Key_change_req
;
64 key
->set_mus_property ("pitch-alist", scm_list_copy (pitchlist
));
65 ((Music
*)key
)->transpose (to_c
);
66 SCM c_pitchlist
= key
->get_mus_property ("pitch-alist");
67 SCM major
= gh_call1 (proc
, c_pitchlist
);
69 audio_
= new Audio_key (gh_scm2int (acc
), major
== SCM_BOOL_T
);
70 Audio_element_info
info (audio_
, key_req_
);
71 announce_element (info
);
77 Key_performer::stop_translation_timestep ()
81 play_element (audio_
);
87 Key_performer::try_music (Music
* req
)
89 if (Key_change_req
*kc
= dynamic_cast <Key_change_req
*> (req
))
92 warning (_ ("FIXME: key change merge"));
101 ENTER_DESCRIPTION(Key_performer
,"","","","","");