2 new-chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000 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"
24 This acknowledges repeated music with "tremolo" style. It typesets
29 - perhaps use engraver this to steer other engravers? That would
30 create dependencies between engravers, which is bad.
32 - create dots if appropriate.
36 class Chord_tremolo_engraver : public Engraver
40 VIRTUAL_COPY_CONS(Translator);
41 Chord_tremolo_engraver();
43 Repeated_music * repeat_;
45 /// moment (global time) where beam started.
49 /// location within measure where beam started.
50 Moment beam_start_location_;
55 Spanner * finished_beam_p_;
58 virtual void do_removal_processing();
59 virtual void do_process_music();
60 virtual bool do_try_music (Music*);
61 virtual void acknowledge_element (Score_element_info);
62 virtual void do_pre_move_processing();
63 virtual void do_post_move_processing();
66 Chord_tremolo_engraver::Chord_tremolo_engraver()
68 beam_p_ = finished_beam_p_ = 0;
74 Chord_tremolo_engraver::do_try_music (Music * m)
76 Repeated_music * rp = dynamic_cast<Repeated_music*> (m);
77 if (rp && rp->type_ == "tremolo" && !repeat_)
79 Moment l = rp->body_length_mom ();
81 start_mom_ = now_mom ();
82 stop_mom_ = start_mom_ + l;
84 // ugh. should generate dots, triplet beams.
85 note_head_i_ = l.den () <? 4;
92 Chord_tremolo_engraver::do_process_music ()
94 if (repeat_ && !beam_p_)
96 beam_p_ = new Spanner (get_property ("Beam"));
97 Beam::set_interface (beam_p_);
98 beam_p_->set_elt_property ("chord-tremolo", SCM_BOOL_T);
101 SCM smp = get_property ("measurePosition");
102 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
103 beam_start_location_ = mp;
104 announce_element (beam_p_, repeat_);
110 Chord_tremolo_engraver::do_removal_processing ()
115 repeat_->origin ()->warning (_ ("unterminated chord tremolo"));
117 finished_beam_p_ = beam_p_;
126 Chord_tremolo_engraver::typeset_beam ()
128 if (finished_beam_p_)
130 typeset_element (finished_beam_p_);
131 finished_beam_p_ = 0;
137 Chord_tremolo_engraver::acknowledge_element (Score_element_info info)
141 if (Stem::has_interface (info.elem_l_))
143 Score_element * s = info.elem_l_;
144 int f = Stem::flag_i (s);
145 f = (f > 2) ? f - 2 : 1;
146 Stem::set_beaming (s, f, LEFT);
147 Stem::set_beaming (s, f, RIGHT);
150 URG: this sets the direction of the Stem s.
153 Stem:: type_i () ->first_head ()->get_direction () ->
154 Directional_element_interface::set (me, d);
157 don't understand this comment.
160 SCM d = s->get_elt_property ("direction");
161 if (Stem::type_i (s ) != 1)
163 int gap_i =Stem::flag_i (s ) - ((Stem::type_i (s ) >? 2) - 2);
164 beam_p_->set_elt_property ("beam-gap", gh_int2scm(gap_i));
166 s->set_elt_property ("direction", d);
168 if (dynamic_cast <Rhythmic_req *> (info.req_l_))
170 Beam::add_stem (beam_p_, s);
174 String s = _ ("stem must have Rhythmic structure");
176 info.req_l_->origin ()->warning (s);
181 if (Note_head::has_interface (info.elem_l_))
183 info.elem_l_->set_elt_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
190 Chord_tremolo_engraver::do_post_move_processing ()
192 if (beam_p_ && stop_mom_ == now_mom ())
194 finished_beam_p_ = beam_p_;
203 Chord_tremolo_engraver::do_pre_move_processing ()
208 ADD_THIS_TRANSLATOR(Chord_tremolo_engraver);