2 completion-note-heads-engraver.cc -- Completion_heads_engraver
4 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "rhythmic-head.hh"
10 #include "paper-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.
30 When we catch the note, we predict the end of the note. We keep the
31 events living until we reach the predicted end-time.
33 Every time process_music () is called and there are note events, we
34 figure out how long the note to typeset should be. It should be no
35 longer than what's specified, than what is left to do and it should
38 We copy the reqs into scratch note reqs, to make sure that we get
39 all durations exactly right.
42 class Completion_heads_engraver : public Engraver
44 Link_array<Item> notes_;
45 Link_array<Item> prev_notes_;
46 Link_array<Grob> ties_;
48 Link_array<Item> dots_;
49 Link_array<Music> note_reqs_;
50 Link_array<Music> scratch_note_reqs_;
55 Rational do_nothing_until_;
57 Moment next_barline_moment ();
58 Duration find_nearest_duration (Rational length);
61 TRANSLATOR_DECLARATIONS (Completion_heads_engraver);
64 virtual void initialize ();
65 virtual void start_translation_timestep ();
66 virtual bool try_music (Music *req) ;
67 virtual void process_music ();
68 virtual void stop_translation_timestep ();
72 Completion_heads_engraver::initialize ()
78 Completion_heads_engraver::try_music (Music *m)
80 if (m->is_mus_type ("note-event"))
85 Moment musiclen = m->get_length ();
86 Moment now = now_mom ();
88 if (now_mom ().grace_part_)
90 musiclen.grace_part_ = musiclen.main_part_ ;
91 musiclen.main_part_ = Rational (0,1);
93 note_end_mom_ = note_end_mom_ >? (now + musiclen);
94 do_nothing_until_ = Rational (0,0);
98 else if (m->is_mus_type ("busy-playing-event"))
100 return note_reqs_.size ();
108 The duration _until_ the next barline.
111 Completion_heads_engraver::next_barline_moment ( )
113 Moment *e = unsmob_moment (get_property ("measurePosition"));
114 Moment *l = unsmob_moment (get_property ("measureLength"));
117 programming_error ("No timing props set?");
125 Completion_heads_engraver::find_nearest_duration (Rational length)
132 this could surely be done more efficient. Left to the reader as an
134 while (d.get_length () > length && d.duration_log () < log_limit)
138 d = Duration (d.duration_log (), d.dot_count ()- 1);
143 d = Duration (d.duration_log () + 1, 2);
147 if (d.duration_log () >= log_limit)
150 d = Duration (d.duration_log (), 0);
153 d = d.compressed (length / d.get_length ());
160 Completion_heads_engraver::process_music ()
162 if (!first_b_ && !left_to_do_)
167 Moment now = now_mom ();
168 if (do_nothing_until_ > now.main_part_)
175 note_dur = find_nearest_duration (left_to_do_);
179 orig = unsmob_duration (note_reqs_[0]->get_property ("duration"));
182 Moment nb = next_barline_moment ();
183 if (nb < note_dur.get_length ())
185 note_dur = find_nearest_duration (nb.main_part_);
188 next.main_part_ += note_dur.get_length ();
190 get_global_context ()->add_moment_to_process (next);
191 do_nothing_until_ = next.main_part_;
196 left_to_do_ = orig->get_length ();
199 if (orig && note_dur.get_length () != orig->get_length ())
201 if (!scratch_note_reqs_.size ())
202 for (int i = 0; i < note_reqs_.size (); i++)
204 Music * m = note_reqs_[i]->clone ();
205 scratch_note_reqs_.push (m);
211 left_to_do_ && i < note_reqs_.size (); i++)
214 Music * req = note_reqs_[i];
215 Item *note = make_item ("NoteHead", req->self_scm ());
216 if (scratch_note_reqs_.size ())
218 req = scratch_note_reqs_[i];
219 SCM pits = note_reqs_[i]->get_property ("pitch");
220 req->set_property ("pitch",pits);
223 req->set_property ("duration", note_dur.smobbed_copy ());
224 note->set_property ("duration-log",
225 scm_int2num (note_dur.duration_log ()));
227 int dots= note_dur.dot_count ();
230 Item * d = make_item ("Dots", SCM_EOL);
231 Rhythmic_head::set_dots (note, d);
234 measly attempt to save an eeny-weenie bit of memory.
236 if (dots != ly_scm2int (d->get_property ("dot-count")))
237 d->set_property ("dot-count", scm_int2num (dots));
239 d->set_parent (note, Y_AXIS);
243 Pitch *pit =unsmob_pitch (req->get_property ("pitch"));
245 int pos = pit->steps ();
246 SCM c0 = get_property ("middleCPosition");
247 if (ly_c_number_p (c0))
248 pos += ly_scm2int (c0);
250 note->set_property ("staff-position", scm_int2num (pos));
254 if (prev_notes_.size () == notes_.size ())
256 for (int i= 0; i < notes_.size (); i++)
258 Grob * p = make_spanner ("Tie", SCM_EOL);
259 Tie::set_interface (p); // cannot remove yet!
261 Tie::set_head (p, LEFT, prev_notes_[i]);
262 Tie::set_head (p, RIGHT, notes_[i]);
269 left_to_do_ -= note_dur.get_length ();
272 don't do complicated arithmetic with grace notes.
275 && now_mom ().grace_part_ )
277 left_to_do_ = Rational (0,0);
282 Completion_heads_engraver::stop_translation_timestep ()
287 prev_notes_ = notes_;
292 for (int i = scratch_note_reqs_.size (); i--;)
294 scm_gc_unprotect_object (scratch_note_reqs_[i]->self_scm () );
297 scratch_note_reqs_.clear ();
301 Completion_heads_engraver::start_translation_timestep ()
303 Moment now = now_mom ();
304 if (note_end_mom_.main_part_ <= now.main_part_)
307 prev_notes_.clear ();
311 Completion_heads_engraver::Completion_heads_engraver ()
315 ENTER_DESCRIPTION (Completion_heads_engraver,
316 /* descr */ "This engraver replaces "
317 "@code{Note_heads_engraver}. It plays some trickery to "
318 "break long notes and automatically tie them into the next measure.",
319 /* creats*/ "NoteHead Dots Tie",
320 /* accepts */ "busy-playing-event note-event",
322 /* reads */ "middleCPosition measurePosition measureLength",