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"
22 This acknowledges repeated music with "tremolo" style. It typesets
27 - perhaps use engraver this to steer other engravers? That would
28 create dependencies between engravers, which is bad.
30 - create dots if appropriate.
34 class Chord_tremolo_engraver : public Engraver
38 VIRTUAL_COPY_CONS(Translator);
39 Chord_tremolo_engraver();
41 Repeated_music * repeat_;
43 /// moment (global time) where beam started.
47 /// location within measure where beam started.
48 Moment beam_start_location_;
53 Beam * finished_beam_p_;
56 virtual void do_removal_processing();
57 virtual void do_process_music();
58 virtual bool do_try_music (Music*);
59 virtual void acknowledge_element (Score_element_info);
60 virtual void do_pre_move_processing();
61 virtual void do_post_move_processing();
64 Chord_tremolo_engraver::Chord_tremolo_engraver()
66 beam_p_ = finished_beam_p_ = 0;
72 Chord_tremolo_engraver::do_try_music (Music * m)
74 Repeated_music * rp = dynamic_cast<Repeated_music*> (m);
75 if (rp && rp->type_ == "tremolo" && !repeat_)
77 Moment l = rp->body_length_mom ();
79 start_mom_ = now_mom ();
80 stop_mom_ = start_mom_ + l;
82 // ugh. should generate dots, triplet beams.
83 note_head_i_ = l.den () <? 4;
90 Chord_tremolo_engraver::do_process_music ()
92 if (repeat_ && !beam_p_)
94 beam_p_ = new Beam (get_property ("basicBeamProperties"));
95 beam_p_->set_elt_property ("chord-tremolo", SCM_BOOL_T);
98 SCM smp = get_property ("measurePosition");
99 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
100 beam_start_location_ = mp;
101 announce_element (Score_element_info (beam_p_, repeat_));
107 Chord_tremolo_engraver::do_removal_processing ()
112 repeat_->warning (_ ("unterminated chord tremolo"));
113 finished_beam_p_ = beam_p_;
119 Chord_tremolo_engraver::typeset_beam ()
121 if (finished_beam_p_)
123 typeset_element (finished_beam_p_);
124 finished_beam_p_ = 0;
130 Chord_tremolo_engraver::acknowledge_element (Score_element_info info)
134 if (Stem::has_interface (info.elem_l_))
136 Score_element * s = info.elem_l_;
137 int f = Stem::flag_i (s);
138 f = (f > 2) ? f - 2 : 1;
139 Stem::set_beaming (s, f, LEFT);
140 Stem::set_beaming (s, f, RIGHT);
143 URG: this sets the direction of the Stem s.
146 Stem:: type_i () ->first_head ()->get_direction () ->
147 Directional_element_interface (me).set (d);
150 don't understand this comment.
153 SCM d = s->get_elt_property ("direction");
154 if (Stem::type_i (s ) != 1)
156 int gap_i =Stem::flag_i (s ) - ((Stem::type_i (s ) >? 2) - 2);
157 beam_p_->set_elt_property ("beam-gap", gh_int2scm(gap_i));
159 s->set_elt_property ("direction", d);
161 if (Rhythmic_req* r = dynamic_cast <Rhythmic_req *> (info.req_l_))
163 beam_p_->add_stem (s);
164 Moment stem_location = now_mom () -
165 start_mom_ + beam_start_location_;
169 String s = _ ("stem must have Rhythmic structure");
171 info.req_l_->warning (s);
176 if (Note_head::has_interface (info.elem_l_))
178 info.elem_l_->set_elt_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
185 Chord_tremolo_engraver::do_post_move_processing ()
187 if (beam_p_ && stop_mom_ == now_mom ())
189 finished_beam_p_ = beam_p_;
198 Chord_tremolo_engraver::do_pre_move_processing ()
203 ADD_THIS_TRANSLATOR(Chord_tremolo_engraver);