2 stem-info.cc -- implement Stem_info
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1998 Jan Nieuwenhuizen <jan@digicash.com>
16 #include "paper-def.hh"
18 #include "stem-info.hh"
20 Stem_info::Stem_info ()
24 Stem_info::Stem_info (Stem const *s)
32 * get algorithm runtime
35 miny_f_ = interline + #beams * interbeam
36 ideal8 = 2 * interline + interbeam
37 ideal16,32,64,128 = 1.5 * interline + #beams * interbeam
40 miny_f_ = interline + #beams * interbeam
41 ideal8,16 = 2 interline + #beams * interbeam
42 ideal32,64,128 = 1.5 interline + #beams * interbeam
46 Real internote_f = s->paper ()->internote_f ();
47 Real interline_f = 2.0 * internote_f;
48 Real interbeam_f = s->paper ()->interbeam_f ();
49 Real staffline_f = s->paper ()->rule_thickness ();
50 Real beam_f = 0.48 * (interline_f - staffline_f);
52 if (check_debug && !monitor->silent_b ("Stem_info"))
55 cout << "******" << i++ << "******" << endl;
56 cout << "begin_f: " << s->stem_begin_f () * dir_ << endl;
58 cout << "chord_f/i: " << s->chord_start_f () * dir_ / internote_f << endl;
62 For simplicity, we'll assume dir = UP and correct if
63 dir = DOWN afterwards.
65 idealy_f_ = s->chord_start_f () * dir_ / internote_f;
66 idealy_f_ *= internote_f;
68 idealy_f_ += interbeam_f * mult_i_;
74 idealy_f_ += 2.0 * interline_f;
76 idealy_f_ += 1.5 * interline_f;
78 miny_f_ += 1.0 * interline_f;
80 // lowest beam of (UP) beam must never be lower than second staffline
81 miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
82 + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
84 idealy_f_ /= internote_f;
85 miny_f_ /= internote_f;
87 if (check_debug && !monitor->silent_b ("Stem_info"))
89 cout << "dir_: " << dir_ << endl;
90 cout << "mult_i_: " << mult_i_ << endl;
91 cout << "idealy_f_: " << idealy_f_ << endl;
92 cout << "miny_f_: " << miny_f_ << endl;
95 idealy_f_ = miny_f_ >? idealy_f_;