2 key-performer.cc -- implement Key_performer
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Jan Nieuwenhuizen <janneke@gnu.org>
9 #include "lily-guile.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_ev* 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);
52 gh_scm2int (ly_caar (pitchlist)),
53 gh_scm2int (ly_cdar (pitchlist)));
58 = ly_transpose_key_alist (pitchlist,
59 interval (key_do, c_do).smobbed_copy ());
61 /* MIDI keys are too limited for lilypond scales.
62 We check for minor scale and assume major otherwise. */
63 SCM minor = scm_primitive_eval (ly_symbol2scm ("minor"));
64 audio_ = new Audio_key (gh_scm2int (acc),
65 SCM_BOOL_T != scm_equal_p (minor, c_pitchlist));
67 Audio_element_info info (audio_, key_req_);
68 announce_element (info);
74 Key_performer::stop_translation_timestep ()
78 play_element (audio_);
84 Key_performer::try_music (Music* req)
86 if (Key_change_ev *kc = dynamic_cast <Key_change_ev *> (req))
89 warning (_ ("FIXME: key change merge"));
98 ENTER_DESCRIPTION(Key_performer,