2 head-grav.cc -- part of GNU LilyPond
4 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "rhythmic-head.hh"
10 #include "paper-def.hh"
11 #include "musical-request.hh"
13 #include "dot-column.hh"
14 #include "staff-symbol-referencer.hh"
16 #include "score-engraver.hh"
23 When we catch the note, we predict the end of the note. We keep the
24 requests living until we reach the predicted end-time.
26 Every time process_music() is called and there are note requests, we
27 figure out how long the note to typeset should be. It should be no
28 longer than what's specified, than what is left to do and it should
31 We copy the reqs into scratch note reqs, to make sure that we get
32 all durations exactly right.
35 class Completion_heads_engraver : public Engraver
37 Link_array<Item> note_p_arr_;
39 Link_array<Item> dot_p_arr_;
40 Link_array<Music> note_req_l_arr_;
41 Link_array<Music> scratch_note_reqs_;
47 Moment next_barline_moment ();
48 Duration find_nearest_duration (Rational length);
51 TRANSLATOR_DECLARATIONS(Completion_heads_engraver);
54 virtual void initialize ();
55 virtual void start_translation_timestep ();
56 virtual bool try_music (Music *req_l) ;
57 virtual void process_music ();
58 virtual void stop_translation_timestep ();
62 Completion_heads_engraver::initialize ()
68 Completion_heads_engraver::try_music (Music *m)
70 if (Note_req * n =dynamic_cast <Note_req *> (m))
72 note_req_l_arr_.push (n);
75 Moment musiclen = m->length_mom ();
76 Moment now = now_mom();
78 if (now_mom ().grace_part_)
80 musiclen.grace_part_ = musiclen.main_part_ ;
81 musiclen.main_part_ = Rational (0,1);
83 note_end_mom_ = note_end_mom_ >? (now + musiclen);
86 else if (dynamic_cast<Busy_playing_req*> (m))
88 return note_req_l_arr_.size ();
96 Completion_heads_engraver::next_barline_moment ( )
98 Moment *e = unsmob_moment (get_property ("measurePosition"));
99 Moment *l = unsmob_moment (get_property ("measureLength"));
102 programming_error ("No timing props set?");
110 Completion_heads_engraver::find_nearest_duration (Rational length)
117 this could surely be done more efficient. Left to the reader as an
119 while (d.length_mom () > length && d.duration_log () < log_limit)
123 d = Duration (d.duration_log (), d.dot_count ()- 1);
128 d = Duration (d.duration_log () + 1, 2);
132 if (d.duration_log () >= log_limit)
135 d = Duration (d.duration_log (), 0);
138 d = d.compressed (length / d.length_mom ());
145 Completion_heads_engraver::process_music ()
147 if (!first_b_ && !left_to_do_)
156 note_dur = find_nearest_duration (left_to_do_);
160 orig = unsmob_duration (note_req_l_arr_[0]->get_mus_property ("duration"));
164 Moment nb = next_barline_moment ();
165 if (nb < note_dur.length_mom ())
167 note_dur = find_nearest_duration (nb.main_part_);
169 Moment next = now_mom();
170 next.main_part_ += note_dur.length_mom ();
171 top_engraver ()->add_moment_to_process (next);
176 left_to_do_ = orig->length_mom ();
179 if (orig && note_dur.length_mom() != orig->length_mom())
181 if (!scratch_note_reqs_.size ())
182 for (int i = 0; i < note_req_l_arr_.size (); i++)
184 Music * m = note_req_l_arr_[i]->clone ();
185 scratch_note_reqs_.push (m);
188 for (int i =0; i < scratch_note_reqs_.size (); i++)
189 scratch_note_reqs_[i]->set_mus_property ("duration", note_dur.smobbed_copy ());
194 left_to_do_ && i < note_req_l_arr_.size (); i++)
196 Item *note_p = new Item (get_property ("NoteHead"));
198 Music * req = note_req_l_arr_[i];
199 if (scratch_note_reqs_.size())
201 req = scratch_note_reqs_[i];
202 SCM pits = note_req_l_arr_[i]->get_mus_property ("pitch");
203 req->set_mus_property ("pitch",pits);
206 note_p->set_grob_property ("duration-log",
207 gh_int2scm (note_dur.duration_log ()));
209 int dots= note_dur.dot_count ();
212 Item * d = new Item (get_property ("Dots"));
213 Rhythmic_head::set_dots (note_p, d);
216 measly attempt to save an eeny-weenie bit of memory.
218 if (dots != gh_scm2int (d->get_grob_property ("dot-count")))
219 d->set_grob_property ("dot-count", gh_int2scm (dots));
221 d->set_parent (note_p, Y_AXIS);
222 announce_grob (d, SCM_EOL);
226 Pitch *pit =unsmob_pitch (req->get_mus_property ("pitch"));
228 int pos = pit->steps ();
229 SCM c0 = get_property ("centralCPosition");
230 if (gh_number_p (c0))
231 pos += gh_scm2int (c0);
233 note_p->set_grob_property ("staff-position", gh_int2scm (pos));
234 announce_grob (note_p,req->self_scm ());
235 note_p_arr_.push (note_p);
238 left_to_do_ -= note_dur.length_mom ();
242 don't do complicated arithmetic with grace notes.
245 && now_mom().grace_part_ )
247 left_to_do_ = Rational (0,0);
253 Completion_heads_engraver::stop_translation_timestep ()
255 for (int i=0; i < note_p_arr_.size (); i++)
257 typeset_grob (note_p_arr_[i]);
259 note_p_arr_.clear ();
261 for (int i=0; i < dot_p_arr_.size (); i++)
263 typeset_grob (dot_p_arr_[i]);
267 for (int i = scratch_note_reqs_.size(); i--;)
269 scm_gc_unprotect_object (scratch_note_reqs_[i]->self_scm () );
272 scratch_note_reqs_.clear();
275 Tie_req * tie_req = 0;
278 Completion_heads_engraver::start_translation_timestep ()
280 Moment now = now_mom ();
281 if (note_end_mom_.main_part_ <= now.main_part_)
283 note_req_l_arr_.clear ();
289 tie_req = new Tie_req;
291 bool succ = daddy_trans_l_->try_music (tie_req);
294 programming_error ("Completion_heads_engraver: no-one to make tie.");
299 Completion_heads_engraver::Completion_heads_engraver()
303 ENTER_DESCRIPTION(Completion_heads_engraver,
304 /* descr */ "This engraver replaces
305 @code{Note_heads_engraver}. It plays some trickery to
306 break long notes and automatically tie them into the next measure.",
307 /* creats*/ "NoteHead Dots",
309 /* reads */ "centralCPosition measurePosition measureLength",