2 new-chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "engraver.hh"
12 #include "repeated-music.hh"
14 #include "rhythmic-head.hh"
15 #include "engraver-group-engraver.hh"
16 #include "musical-request.hh"
19 #include "note-head.hh"
22 #include "chord-tremolo-iterator.hh"
23 #include "stem-tremolo.hh"
24 #include "music-list.hh"
25 #include "math.h" // ceil
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?
41 class Chord_tremolo_engraver : public Engraver
44 TRANSLATOR_DECLARATIONS(Chord_tremolo_engraver);
46 Repeated_music * repeat_;
48 /// moment (global time) where beam started.
52 /// location within measure where beam started.
53 Moment beam_start_location_;
58 bool sequential_body_b_;
60 Spanner * finished_beam_p_;
63 virtual void finalize ();
64 virtual bool try_music (Music*);
65 virtual void acknowledge_grob (Grob_info);
66 virtual void stop_translation_timestep ();
67 virtual void start_translation_timestep ();
68 virtual void process_music ();
71 Chord_tremolo_engraver::Chord_tremolo_engraver ()
73 beam_p_ = finished_beam_p_ = 0;
78 sequential_body_b_ = false;
82 Chord_tremolo_engraver::try_music (Music * m)
84 Repeated_music * rp = dynamic_cast<Repeated_music*> (m);
86 && rp->get_mus_property ("iterator-ctor") == Chord_tremolo_iterator::constructor_cxx_function
89 Moment l = rp->length_mom ();
91 start_mom_ = now_mom ();
92 stop_mom_ = start_mom_ + l;
93 sequential_body_b_ = dynamic_cast<Sequential_music*> (rp->body ());
95 // ugh. should generate triplet beams.
96 note_head_i_ = int (ceil (double(l.den ()) / l.num ()));
97 dots_i_ = intlog2 (1+l.num ()) -1 ; // 1->0, 3->1, 7->2
98 note_head_i_ = note_head_i_ <? 4;
106 Chord_tremolo_engraver::process_music ()
110 if (sequential_body_b_ && !beam_p_)
112 beam_p_ = new Spanner (get_property ("Beam"));
113 beam_p_->set_grob_property ("chord-tremolo", SCM_BOOL_T);
116 SCM smp = get_property ("measurePosition");
118 = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
119 beam_start_location_ = mp;
120 announce_grob(beam_p_, repeat_->self_scm());
122 else if (!sequential_body_b_ && !stem_tremolo_)
124 int flags = intlog2 (note_head_i_ * repeat_->repeat_count ()) -2;
127 stem_tremolo_ = new Item (get_property ("StemTremolo"));
128 announce_grob(stem_tremolo_, repeat_->self_scm());
129 stem_tremolo_->set_grob_property ("flag-count",
137 Chord_tremolo_engraver::finalize ()
142 repeat_->origin ()->warning (_ ("unterminated chord tremolo"));
148 Chord_tremolo_engraver::typeset_beam ()
150 if (finished_beam_p_)
152 typeset_grob (finished_beam_p_);
153 finished_beam_p_ = 0;
159 Chord_tremolo_engraver::acknowledge_grob (Grob_info info)
163 if (Stem::has_interface (info.grob_l_))
165 Grob * s = info.grob_l_;
166 int f = Stem::duration_log (s);
167 f = (f > 2) ? f - 2 : 1;
168 Stem::set_beaming (s, f, LEFT);
169 Stem::set_beaming (s, f, RIGHT);
171 SCM d = s->get_grob_property ("direction");
172 if (Stem::type_i (s) != 1)
174 int gap_i =Stem::duration_log (s) - ((Stem::type_i (s) >? 2) - 2);
175 beam_p_->set_grob_property ("gap", gh_int2scm (gap_i));
177 s->set_grob_property ("direction", d);
179 if (dynamic_cast <Rhythmic_req *> (info.music_cause ()))
181 Beam::add_stem (beam_p_, s);
185 String s = _ ("stem must have Rhythmic structure");
186 if (info.music_cause ())
187 info.music_cause ()->origin ()->warning (s);
193 else if (stem_tremolo_ && Stem::has_interface (info.grob_l_))
195 Stem_tremolo::set_stem (stem_tremolo_, info.grob_l_);
197 info.grob_l_->set_grob_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
201 if (repeat_ && Note_head::has_interface (info.grob_l_))
203 info.grob_l_->set_grob_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
206 Item * d = new Item (get_property ("Dots"));
207 Rhythmic_head::set_dots (info.grob_l_, d);
209 d->set_grob_property ("dot-count", gh_int2scm (dots_i_));
211 d->set_parent (info.grob_l_, Y_AXIS);
212 announce_grob (d, SCM_EOL);
219 Chord_tremolo_engraver::start_translation_timestep ()
221 if (beam_p_ && stop_mom_ == now_mom ())
223 finished_beam_p_ = beam_p_;
232 Chord_tremolo_engraver::stop_translation_timestep ()
238 typeset_grob (stem_tremolo_);
246 ENTER_DESCRIPTION(Chord_tremolo_engraver,
247 /* descr */ "Generates beams for tremolo repeats.",
249 /* acks */ "stem-interface note-head-interface",