2 stem-info.cc -- implement Stem_info
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1998 Jan Nieuwenhuizen <janneke@gnu.org>
15 #include "paper-def.hh"
17 #include "stem-info.hh"
19 Stem_info::Stem_info ()
23 Stem_info::Stem_info (Stem const *s)
27 beam_dir_ = s->beam_dir_;
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 interbeam_f = s->paper ()->interbeam_f (mult_i_);
48 Real beam_f = s->paper ()->beam_thickness_f ();
53 DOUT << "******" << i++ << "******\n"
54 << "begin_f: " << s->stem_begin_f () * dir_
55 << "\nchord_f/i: " << s->chord_start_f () * dir_ / internote_f << '\n';
59 For simplicity, we'll assume dir = UP and correct if
60 dir = DOWN afterwards.
62 idealy_f_ = s->chord_start_f () * beam_dir_ / internote_f;
63 idealy_f_ *= internote_f;
65 Real break_i = (int)rint (s->paper ()->get_var ("beam_multiple_break"));
66 Real min_stem1_f = s->paper ()->get_var ("beam_minimum_stem1");
67 Real min_stem2_f = s->paper ()->get_var ("beam_minimum_stem2");
68 Real ideal_stem1_f = s->paper ()->get_var ("beam_ideal_stem1");
69 Real ideal_stem2_f = s->paper ()->get_var ("beam_ideal_stem2");
70 Real shorten_f = s->paper ()->get_var ("forced_stem_shorten");
72 if (!beam_dir_ || (beam_dir_ == dir_))
74 idealy_f_ += interbeam_f * mult_i_;
78 if (mult_i_ < break_i)
80 idealy_f_ += ideal_stem1_f;
81 miny_f_ += min_stem1_f;
85 idealy_f_ += ideal_stem2_f;
86 miny_f_ += min_stem2_f;
89 // stems in unnatural (forced) direction are shortened
90 if (s->dir_ != s->get_default_dir ())
91 idealy_f_ -= shorten_f;
93 // lowest beam of (UP) beam must never be lower than second staffline
94 miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
95 + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
104 if (mult_i_ < break_i)
106 idealy_f_ -= ideal_stem1_f;
107 maxy_f_ -= min_stem1_f;
111 idealy_f_ -= ideal_stem2_f;
112 maxy_f_ -= min_stem2_f;
116 idealy_f_ /= internote_f;
117 miny_f_ /= internote_f;
118 maxy_f_ /= internote_f;
120 DOUT << "dir_: " << dir_ << '\n';
121 DOUT << "mult_i_: " << mult_i_ << '\n';
122 DOUT << "idealy_f_: " << idealy_f_ << '\n';
123 DOUT << "miny_f_: " << miny_f_ << '\n';
124 DOUT << "maxy_f_: " << maxy_f_ << '\n';
126 idealy_f_ = maxy_f_ <? idealy_f_;
127 idealy_f_ = miny_f_ >? idealy_f_;