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>
12 #include "cross-staff.hh"
15 #include "paper-def.hh"
17 #include "stem-info.hh"
21 Stem_info::Stem_info ()
27 FIXME: y dims should not be in internote.
30 GURG UGRGINRG INA UG R
32 JUNKME -> This should be in Beam
34 Stem_info::Stem_info (Stem*s, int mult)
38 Beam* beam_l = stem_l_->beam_l_;
40 x_ = stem_l_->hpos_f ();
41 set_direction (stem_l_->get_direction ());
42 SCM bd = stem_l_->remove_elt_property ("beam-dir");
46 beam_dir_ = gh_scm2int (bd);
50 programming_error ("Beam direction not set.");
51 beam_dir_ = UP; // GURAUGRNAGURAGU! urg !
54 Paper_def* paper_l = stem_l_->paper_l ();
55 Real internote_f = stem_l_->staff_line_leading_f ()/2;
56 Real interbeam_f = paper_l->interbeam_f (mult_i_);
57 Real beam_f = gh_scm2double (beam_l->get_elt_property ("beam-thickness"));
60 // strangely enough, dim(chord_start_f) == pt (and not internote!)
61 idealy_f_ = stem_l_->chord_start_f () / internote_f;
63 // calculate using dim(y) == pt
64 idealy_f_ *= internote_f;
66 // for simplicity, we calculate as if dir == UP
67 idealy_f_ *= beam_dir_;
69 bool grace_b = stem_l_->get_elt_property ("grace") != SCM_UNDEFINED;
70 bool no_extend_b = stem_l_->get_elt_property ("no-stem-extend")
73 int stem_max = (int)rint(paper_l->get_var ("stem_max"));
74 String type_str = grace_b ? "grace_" : "";
75 Real min_stem_f = paper_l->get_var (type_str + "minimum_stem_length"
76 + to_str (mult_i_ <? stem_max)) * internote_f;
77 Real stem_f = paper_l->get_var (type_str + "stem_length"
78 + to_str (mult_i_ <? stem_max))* internote_f;
80 if (!beam_dir_ || (beam_dir_ == get_direction ()))
81 /* normal beamed stem */
86 idealy_f_ += (mult_i_ - 1) * interbeam_f;
92 miny_f_ += min_stem_f;
95 lowest beam of (UP) beam must never be lower than second staffline
97 Hmm, reference (Wanske?)
99 Although this (additional) rule is probably correct,
100 I expect that highest beam (UP) should also never be lower
101 than middle staffline, just as normal stems.
104 if (!grace_b && !no_extend_b)
106 //highest beam of (UP) beam must never be lower than middle staffline
107 miny_f_ = miny_f_ >? 0;
108 //lowest beam of (UP) beam must never be lower than second staffline
109 miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
110 + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
121 maxy_f_ -= min_stem_f;
124 // set dim(y) == internote
125 idealy_f_ /= internote_f;
126 miny_f_ /= internote_f;
127 maxy_f_ /= internote_f;
129 idealy_f_ = maxy_f_ <? idealy_f_;
130 idealy_f_ = miny_f_ >? idealy_f_;
132 interstaff_f_ = calc_interstaff_dist (stem_l_, beam_l) / internote_f;
133 idealy_f_ += interstaff_f_* beam_dir_;
134 miny_f_ += interstaff_f_ * beam_dir_;
135 maxy_f_ += interstaff_f_ * beam_dir_;