2 chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
7 Erik Sandberg <mandolaerik@gmail.com>
11 #include "engraver-group.hh"
12 #include "international.hh"
14 #include "math.h" // ceil
16 #include "repeated-music.hh"
17 #include "rhythmic-head.hh"
19 #include "stem-tremolo.hh"
21 #include "stream-event.hh"
24 #include "translator.icc"
28 This acknowledges repeated music with "tremolo" style. It typesets
33 - perhaps use engraver this to steer other engravers? That would
34 create dependencies between engravers, which is bad.
36 - create dots if appropriate.
38 - create TremoloBeam iso Beam?
40 class Chord_tremolo_engraver : public Engraver
42 TRANSLATOR_DECLARATIONS (Chord_tremolo_engraver);
44 Stream_event *repeat_;
47 // number of beams for short tremolos
48 int expected_beam_count_;
49 // current direction of beam (first RIGHT, then LEFT)
54 virtual void finalize ();
55 void process_music ();
56 DECLARE_TRANSLATOR_LISTENER (tremolo_span);
57 DECLARE_ACKNOWLEDGER (stem);
60 Chord_tremolo_engraver::Chord_tremolo_engraver ()
65 expected_beam_count_ = 0;
69 IMPLEMENT_TRANSLATOR_LISTENER (Chord_tremolo_engraver, tremolo_span);
71 Chord_tremolo_engraver::listen_tremolo_span (Stream_event *ev)
73 Direction span_dir = to_dir (ev->get_property ("span-direction"));
74 if (span_dir == START)
77 int type = scm_to_int (ev->get_property ("tremolo-type"));
78 /* e.g. 1 for type 8, 2 for type 16 */
79 flags_ = intlog2 (type) - 2;
80 expected_beam_count_ = scm_to_int (ev->get_property ("expected-beam-count"));
83 else if (span_dir == STOP)
87 expected_beam_count_ = 0;
93 Chord_tremolo_engraver::process_music ()
95 if (repeat_ && !beam_)
97 beam_ = make_spanner ("Beam", repeat_->self_scm ());
102 Chord_tremolo_engraver::finalize ()
106 repeat_->origin ()->warning (_ ("unterminated chord tremolo"));
112 Chord_tremolo_engraver::acknowledge_stem (Grob_info info)
116 Grob *s = info.grob ();
118 Stem::set_beaming (s, flags_, beam_dir_);
120 if (Stem::duration_log (s) != 1)
121 beam_->set_property ("gap-count", scm_from_int (flags_ - expected_beam_count_));
123 if (beam_dir_ == RIGHT)
126 if (info.ultimate_music_cause ()->is_mus_type ("rhythmic-event"))
127 Beam::add_stem (beam_, s);
130 string s = _ ("stem must have Rhythmic structure");
131 if (info.music_cause ())
132 info.music_cause ()->origin ()->warning (s);
139 ADD_ACKNOWLEDGER (Chord_tremolo_engraver, stem);
140 ADD_TRANSLATOR (Chord_tremolo_engraver,
141 /* doc */ "Generates beams for tremolo repeats.",
143 /* accept */ "tremolo-span-event",