2 beam-grav.cc -- implement Beam_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
8 #include "duration-convert.hh"
9 #include "time-description.hh"
10 #include "beam-grav.hh"
13 #include "musical-request.hh"
14 #include "grouping.hh"
15 #include "text-spanner.hh"
16 #include "text-def.hh"
19 Beam_engraver::Beam_engraver()
21 span_reqs_drul_[LEFT] = span_reqs_drul_[RIGHT] =0;
23 current_grouping_p_ =0;
28 Beam_engraver::do_try_request(Request*r)
30 Musical_req* mus_l = r->musical();
34 Beam_req * b = mus_l->beam();
39 if (bool (beam_p_) == bool (b->spantype == Span_req::START))
42 Direction d = (!beam_p_) ? LEFT : RIGHT;
43 if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (mus_l))
46 span_reqs_drul_[d] = b;
51 Beam_engraver::do_process_requests()
53 if ( !beam_p_ && span_reqs_drul_[LEFT]) {
54 current_grouping_p_ = new Rhythmic_grouping;
56 if (span_reqs_drul_[LEFT]->nplet)
58 plet_spanner_p_ = new Text_spanner();
59 Text_def *defp = new Text_def;
60 plet_spanner_p_->set_support (beam_p_);
63 plet_spanner_p_->set_bounds (LEFT, get_staff_info ().command_pcol_l ());
66 defp->text_str_ = span_reqs_drul_[LEFT]->nplet;
67 defp->style_str_="italic";
68 plet_spanner_p_->spec_p_ = defp;
69 announce_element (Score_elem_info(plet_spanner_p_,0));
72 Scalar prop = get_property ("beamslopedamping");
75 beam_p_->damping_i_ = prop;
78 prop = get_property ("beamquantisaton");
81 beam_p_->quantisation_ = (Beam::Quantise)(int)prop;
84 announce_element (Score_elem_info (beam_p_, span_reqs_drul_[LEFT]));
89 Beam_engraver::do_pre_move_processing()
91 if (beam_p_ && span_reqs_drul_[RIGHT])
93 Rhythmic_grouping const * rg_C = get_staff_info().rhythmic_C_;
94 rg_C->extend (current_grouping_p_->interval());
95 beam_p_->set_grouping (*rg_C, *current_grouping_p_);
96 typeset_element (beam_p_);
99 delete current_grouping_p_;
100 current_grouping_p_ = 0;
102 span_reqs_drul_[RIGHT] =
103 span_reqs_drul_[LEFT] = 0;
106 typeset_element (plet_spanner_p_);
113 Beam_engraver::do_removal_processing()
117 span_reqs_drul_[LEFT]->warning (_("unterminated beam"));
118 typeset_element (beam_p_);
125 Beam_engraver::acknowledge_element (Score_elem_info i)
127 if (!beam_p_ || !i.elem_l_->is_type_b (Stem::static_name ()))
130 Stem* s = (Stem*)i.elem_l_->item();
131 Rhythmic_req *rhythmic_req = i.req_l_->musical ()->rhythmic ();
132 if (rhythmic_req->duration_.durlog_i_<= 2)
134 rhythmic_req->warning (_("Stem doesn't fit in Beam"));
139 TODO: do something sensible if it doesn't fit in the beam.
141 Moment start = get_staff_info().time_C_->whole_in_measure_;
143 if (!current_grouping_p_->child_fit_b (start))
145 String s (_("please fix me: Stem at ")
146 + String(now_moment ()) + _(" does not fit in beam"));
148 i.req_l_->warning(s);
154 current_grouping_p_->add_child (start, rhythmic_req->duration ());
155 s->flag_i_ = rhythmic_req->duration_.durlog_i_;
159 IMPLEMENT_IS_TYPE_B1(Beam_engraver, Engraver);
160 ADD_THIS_TRANSLATOR(Beam_engraver);