2 stem-info.cc -- implement Stem_info
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1999 Jan Nieuwenhuizen <janneke@gnu.org>
15 #include "paper-def.hh"
17 #include "stem-info.hh"
19 #include "staff-symbol.hh"
21 Stem_info::Stem_info ()
25 Stem_info::Stem_info (Stem*s)
28 x_ = stem_l_->hpos_f ();
30 beam_dir_ = stem_l_->beam_dir_;
31 mult_i_ = stem_l_->mult_i_;
34 Paper_def* paper_l = stem_l_->paper_l ();
35 Real internote_f = stem_l_->staff_line_leading_f ()/2;
36 Real interbeam_f = paper_l->interbeam_f (mult_i_);
37 Real beam_f = paper_l->beam_thickness_f ();
41 DOUT << "******" << i++ << "******\n"
42 << "begin_f: " << stem_l_->stem_begin_f () * dir_
43 << "\nchord_f/i: " << stem_l_->chord_start_f () * dir_ / internote_f << '\n';
46 // strangely enough, dim(chord_start_f) == pt (and not internote!)
47 idealy_f_ = stem_l_->chord_start_f () / internote_f;
49 // calculate using dim(y) == pt
50 idealy_f_ *= internote_f;
52 // for simplicity, we calculate as if dir == UP
53 idealy_f_ *= beam_dir_;
55 int stem_max = (int)rint(paper_l->get_var ("stem_max"));
56 Real min_stem_f = paper_l->get_var (String ("minimum_stem_length")
57 + to_str (mult_i_ <? stem_max));
58 Real stem_f = paper_l->get_var (String ("stem_length")
59 + to_str (mult_i_ <? stem_max));
61 if (!beam_dir_ || (beam_dir_ == dir_))
62 /* normal beamed stem */
67 idealy_f_ += (mult_i_ - 1) * interbeam_f;
73 miny_f_ += min_stem_f;
75 // lowest beam of (UP) beam must never be lower than second staffline
76 miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
77 + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
83 // idealy_f_ -= (mult_i_ - 1) * interbeam_f;
84 // idealy_f_ += (mult_i_ - stem_l_->flag_i_ >? 0) * interbeam_f;
89 maxy_f_ -= min_stem_f;
92 // set dim(y) == internote
93 idealy_f_ /= internote_f;
94 miny_f_ /= internote_f;
95 maxy_f_ /= internote_f;
97 DOUT << "dir_: " << dir_ << '\n';
98 DOUT << "mult_i_: " << mult_i_ << '\n';
99 DOUT << "idealy_f_: " << idealy_f_ << '\n';
100 DOUT << "miny_f_: " << miny_f_ << '\n';
101 DOUT << "maxy_f_: " << maxy_f_ << '\n';
103 idealy_f_ = maxy_f_ <? idealy_f_;
104 idealy_f_ = miny_f_ >? idealy_f_;
107 Beam* beam_l_ = stem_l_->beam_l_;
108 if (beam_l_->sinfo_.size ()
109 && stem_l_->staff_symbol_l () != beam_l_->sinfo_[0].stem_l_->staff_symbol_l ())
112 // warning (_ ("invalid dimension cache: guessing staff position"));
113 if (beam_l_->vertical_align_drul_[MIN] !=
114 beam_l_->vertical_align_drul_[MAX])
115 warning (_ ("minVerticalAlign != maxVerticalAlign: interstaff slurs may be broken"));
116 interstaff_f_ = beam_l_->vertical_align_drul_[MIN] / internote_f;
117 // urg, guess staff order:
118 // if our stem ends higher, our staff is probably lower...
119 if (idealy_f_ * beam_dir_ > beam_l_->sinfo_[0].idealy_f_ * beam_dir_)
122 idealy_f_ += interstaff_f_ * beam_dir_;
123 miny_f_ += interstaff_f_ * beam_dir_;
124 maxy_f_ += interstaff_f_ * beam_dir_;