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>
11 #include "dimension.hh"
16 #include "paper-def.hh"
18 #include "stem-info.hh"
20 Stem_info::Stem_info ()
24 Stem_info::Stem_info (Stem const *s)
28 beam_dir_ = s->beam_dir_;
36 miny_f_ = interline + #beams * interbeam
37 ideal8 = 2 * interline + interbeam
38 ideal16,32,64,128 = 1.5 * interline + #beams * interbeam
41 miny_f_ = interline + #beams * interbeam
42 ideal8,16 = 2 interline + #beams * interbeam
43 ideal32,64,128 = 1.5 interline + #beams * interbeam
47 Real internote_f = s->paper ()->internote_f ();
48 Real interbeam_f = s->paper ()->interbeam_f (mult_i_);
49 Real beam_f = s->paper ()->beam_thickness_f ();
54 DOUT << "******" << i++ << "******\n"
55 << "begin_f: " << s->stem_begin_f () * dir_
56 << "\nchord_f/i: " << s->chord_start_f () * dir_ / internote_f << '\n';
60 For simplicity, we'll assume dir = UP and correct if
61 dir = DOWN afterwards.
63 idealy_f_ = s->chord_start_f () * beam_dir_ / internote_f;
64 idealy_f_ *= internote_f;
66 Real break_i = (int)rint (s->paper ()->get_var ("beam_multiple_break"));
67 Real min_stem1_f = s->paper ()->get_var ("beam_minimum_stem1");
68 Real min_stem2_f = s->paper ()->get_var ("beam_minimum_stem2");
69 Real ideal_stem1_f = s->paper ()->get_var ("beam_ideal_stem1");
70 Real ideal_stem2_f = s->paper ()->get_var ("beam_ideal_stem2");
71 Real shorten_f = s->paper ()->get_var ("forced_stem_shorten");
73 if (!beam_dir_ || (beam_dir_ == dir_))
75 idealy_f_ += interbeam_f * mult_i_;
79 if (mult_i_ < break_i)
81 idealy_f_ += ideal_stem1_f;
82 miny_f_ += min_stem1_f;
86 idealy_f_ += ideal_stem2_f;
87 miny_f_ += min_stem2_f;
90 // stems in unnatural (forced) direction are shortened
91 if (s->dir_ != s->get_default_dir ())
92 idealy_f_ -= shorten_f;
94 // lowest beam of (UP) beam must never be lower than second staffline
95 miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
96 + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
105 if (mult_i_ < break_i)
107 idealy_f_ -= ideal_stem1_f;
108 maxy_f_ -= min_stem1_f;
112 idealy_f_ -= ideal_stem2_f;
113 maxy_f_ -= min_stem2_f;
117 idealy_f_ /= internote_f;
118 miny_f_ /= internote_f;
119 maxy_f_ /= internote_f;
121 DOUT << "dir_: " << dir_ << '\n';
122 DOUT << "mult_i_: " << mult_i_ << '\n';
123 DOUT << "idealy_f_: " << idealy_f_ << '\n';
124 DOUT << "miny_f_: " << miny_f_ << '\n';
125 DOUT << "maxy_f_: " << maxy_f_ << '\n';
127 idealy_f_ = maxy_f_ <? idealy_f_;
128 idealy_f_ = miny_f_ >? idealy_f_;