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.
34 - create TremoloBeam iso Beam?
37 class Chord_tremolo_engraver : public Engraver
41 VIRTUAL_COPY_CONS(Translator);
42 Chord_tremolo_engraver();
44 Repeated_music * repeat_;
46 /// moment (global time) where beam started.
50 /// location within measure where beam started.
51 Moment beam_start_location_;
56 Spanner * finished_beam_p_;
59 virtual void do_removal_processing();
60 virtual void do_process_music();
61 virtual bool do_try_music (Music*);
62 virtual void acknowledge_element (Score_element_info);
63 virtual void do_pre_move_processing();
64 virtual void do_post_move_processing();
67 Chord_tremolo_engraver::Chord_tremolo_engraver()
69 beam_p_ = finished_beam_p_ = 0;
75 Chord_tremolo_engraver::do_try_music (Music * m)
77 Repeated_music * rp = dynamic_cast<Repeated_music*> (m);
78 if (rp && rp->type_ == "tremolo" && !repeat_)
80 Moment l = rp->body_length_mom ();
82 start_mom_ = now_mom ();
83 stop_mom_ = start_mom_ + l;
85 // ugh. should generate dots, triplet beams.
86 note_head_i_ = l.den () <? 4;
93 Chord_tremolo_engraver::do_process_music ()
95 if (repeat_ && !beam_p_)
97 beam_p_ = new Spanner (get_property ("Beam"));
98 Beam::set_interface (beam_p_);
99 beam_p_->set_elt_property ("chord-tremolo", SCM_BOOL_T);
102 SCM smp = get_property ("measurePosition");
103 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
104 beam_start_location_ = mp;
105 announce_element (beam_p_, repeat_);
111 Chord_tremolo_engraver::do_removal_processing ()
116 repeat_->origin ()->warning (_ ("unterminated chord tremolo"));
118 finished_beam_p_ = beam_p_;
127 Chord_tremolo_engraver::typeset_beam ()
129 if (finished_beam_p_)
131 typeset_element (finished_beam_p_);
132 finished_beam_p_ = 0;
138 Chord_tremolo_engraver::acknowledge_element (Score_element_info info)
142 if (Stem::has_interface (info.elem_l_))
144 Score_element * s = info.elem_l_;
145 int f = Stem::flag_i (s);
146 f = (f > 2) ? f - 2 : 1;
147 Stem::set_beaming (s, f, LEFT);
148 Stem::set_beaming (s, f, RIGHT);
151 URG: this sets the direction of the Stem s.
154 Stem:: type_i () ->first_head ()->get_direction () ->
155 Directional_element_interface::set (me, d);
158 don't understand this comment.
161 SCM d = s->get_elt_property ("direction");
162 if (Stem::type_i (s ) != 1)
164 int gap_i =Stem::flag_i (s ) - ((Stem::type_i (s ) >? 2) - 2);
165 beam_p_->set_elt_property ("beam-gap", gh_int2scm(gap_i));
167 s->set_elt_property ("direction", d);
169 if (dynamic_cast <Rhythmic_req *> (info.req_l_))
171 Beam::add_stem (beam_p_, s);
175 String s = _ ("stem must have Rhythmic structure");
177 info.req_l_->origin ()->warning (s);
182 if (Note_head::has_interface (info.elem_l_))
184 info.elem_l_->set_elt_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
191 Chord_tremolo_engraver::do_post_move_processing ()
193 if (beam_p_ && stop_mom_ == now_mom ())
195 finished_beam_p_ = beam_p_;
204 Chord_tremolo_engraver::do_pre_move_processing ()
209 ADD_THIS_TRANSLATOR(Chord_tremolo_engraver);