2 completion-note-heads-engraver.cc -- Completion_heads_engraver
4 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "rhythmic-head.hh"
10 #include "output-def.hh"
13 #include "dot-column.hh"
14 #include "staff-symbol-referencer.hh"
16 #include "score-engraver.hh"
20 #include "global-context.hh"
23 TODO: make matching rest engraver.
29 When we catch the note, we predict the end of the note. We keep the
30 events living until we reach the predicted end-time.
32 Every time process_music () is called and there are note events, we
33 figure out how long the note to typeset should be. It should be no
34 longer than what's specified, than what is left to do and it should
37 We copy the reqs into scratch note reqs, to make sure that we get
38 all durations exactly right.
41 class Completion_heads_engraver : public Engraver
43 Link_array<Item> notes_;
44 Link_array<Item> prev_notes_;
45 Link_array<Grob> ties_;
47 Link_array<Item> dots_;
48 Link_array<Music> note_reqs_;
49 Link_array<Music> scratch_note_reqs_;
54 Rational do_nothing_until_;
56 Moment next_barline_moment ();
57 Duration find_nearest_duration (Rational length);
60 TRANSLATOR_DECLARATIONS (Completion_heads_engraver);
63 virtual void initialize ();
64 virtual void start_translation_timestep ();
65 virtual bool try_music (Music *req);
66 virtual void process_music ();
67 virtual void stop_translation_timestep ();
71 Completion_heads_engraver::initialize ()
77 Completion_heads_engraver::try_music (Music *m)
79 if (m->is_mus_type ("note-event"))
84 Moment musiclen = m->get_length ();
85 Moment now = now_mom ();
87 if (now_mom ().grace_part_)
89 musiclen.grace_part_ = musiclen.main_part_;
90 musiclen.main_part_ = Rational (0, 1);
92 note_end_mom_ = note_end_mom_ >? (now + musiclen);
93 do_nothing_until_ = Rational (0, 0);
97 else if (m->is_mus_type ("busy-playing-event"))
99 return note_reqs_.size () && is_first_;
107 The duration _until_ the next barline.
110 Completion_heads_engraver::next_barline_moment ()
112 Moment *e = unsmob_moment (get_property ("measurePosition"));
113 Moment *l = unsmob_moment (get_property ("measureLength"));
116 programming_error ("No timing props set?");
117 return Moment (1, 1);
124 Completion_heads_engraver::find_nearest_duration (Rational length)
131 this could surely be done more efficient. Left to the reader as an
133 while (d.get_length () > length && d.duration_log () < log_limit)
137 d = Duration (d.duration_log (), d.dot_count ()- 1);
142 d = Duration (d.duration_log () + 1, 2);
146 if (d.duration_log () >= log_limit)
149 d = Duration (d.duration_log (), 0);
152 d = d.compressed (length / d.get_length ());
159 Completion_heads_engraver::process_music ()
161 if (!is_first_ && !left_to_do_)
166 Moment now = now_mom ();
167 if (do_nothing_until_ > now.main_part_)
174 note_dur = find_nearest_duration (left_to_do_);
178 orig = unsmob_duration (note_reqs_[0]->get_property ("duration"));
181 Moment nb = next_barline_moment ();
182 if (nb < note_dur.get_length ())
184 note_dur = find_nearest_duration (nb.main_part_);
187 next.main_part_ += note_dur.get_length ();
189 get_global_context ()->add_moment_to_process (next);
190 do_nothing_until_ = next.main_part_;
195 left_to_do_ = orig->get_length ();
198 if (orig && note_dur.get_length () != orig->get_length ())
200 if (!scratch_note_reqs_.size ())
201 for (int i = 0; i < note_reqs_.size (); i++)
203 Music *m = note_reqs_[i]->clone ();
204 scratch_note_reqs_.push (m);
209 left_to_do_ && i < note_reqs_.size (); i++)
211 Music *req = note_reqs_[i];
212 if (scratch_note_reqs_.size ())
214 req = scratch_note_reqs_[i];
215 SCM pits = note_reqs_[i]->get_property ("pitch");
216 req->set_property ("pitch", pits);
219 req->set_property ("duration", note_dur.smobbed_copy ());
221 Item *note = make_item ("NoteHead", req->self_scm ());
222 note->set_property ("duration-log",
223 scm_int2num (note_dur.duration_log ()));
225 int dots = note_dur.dot_count ();
228 Item *d = make_item ("Dots", SCM_EOL);
229 Rhythmic_head::set_dots (note, d);
232 measly attempt to save an eeny-weenie bit of memory.
234 if (dots != scm_to_int (d->get_property ("dot-count")))
235 d->set_property ("dot-count", scm_int2num (dots));
237 d->set_parent (note, Y_AXIS);
241 Pitch *pit = unsmob_pitch (req->get_property ("pitch"));
243 int pos = pit->steps ();
244 SCM c0 = get_property ("middleCPosition");
245 if (scm_is_number (c0))
246 pos += scm_to_int (c0);
248 note->set_property ("staff-position", scm_int2num (pos));
252 if (prev_notes_.size () == notes_.size ())
254 for (int i = 0; i < notes_.size (); i++)
256 Grob *p = make_spanner ("Tie", SCM_EOL);
257 Tie::set_interface (p); // cannot remove yet!
259 Tie::set_head (p, LEFT, prev_notes_[i]);
260 Tie::set_head (p, RIGHT, notes_[i]);
267 left_to_do_ -= note_dur.get_length ();
270 don't do complicated arithmetic with grace notes.
273 && now_mom ().grace_part_)
275 left_to_do_ = Rational (0, 0);
280 Completion_heads_engraver::stop_translation_timestep ()
285 prev_notes_ = notes_;
290 for (int i = scratch_note_reqs_.size (); i--;)
292 scm_gc_unprotect_object (scratch_note_reqs_[i]->self_scm ());
295 scratch_note_reqs_.clear ();
299 Completion_heads_engraver::start_translation_timestep ()
301 Moment now = now_mom ();
302 if (note_end_mom_.main_part_ <= now.main_part_)
305 prev_notes_.clear ();
309 Completion_heads_engraver::Completion_heads_engraver ()
313 ADD_TRANSLATOR (Completion_heads_engraver,
314 /* descr */ "This engraver replaces "
315 "@code{Note_heads_engraver}. It plays some trickery to "
316 "break long notes and automatically tie them into the next measure.",
317 /* creats*/ "NoteHead Dots Tie",
318 /* accepts */ "busy-playing-event note-event",
320 /* reads */ "middleCPosition measurePosition measureLength",