2 spacing-basic.cc -- implement Spacing_spanner, simplistic spacing routines
4 source file of the GNU LilyPond music typesetter
6 (c) 2005--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "spacing-spanner.hh"
11 #include "spacing-options.hh"
13 #include "paper-column.hh"
15 #include "pointer-group-interface.hh"
19 LilyPond spaces by taking a simple-minded spacing algorithm, and
20 adding subtle adjustments to that. This file does the simple-minded
24 The one-size-fits all spacing. It doesn't take into account
25 different spacing wishes from one to the next column.
28 Spacing_spanner::standard_breakable_column_spacing (Grob *me, Item *l, Item *r,
29 Real *fixed, Real *space,
30 Spacing_options const *options)
34 Drul_array<Item *> cols (l, r);
39 TODO: this is fishy, the extent gets distorted due to wide
40 \marks, so better not do this.
42 if (!Paper_column::is_musical (cols[d]))
45 Tied accidentals over barlines cause problems, so lets see
46 what happens if we do this for non musical columns only.
48 Interval lext = cols[d]->extent (cols [d], X_AXIS);
49 if (!lext.is_empty ())
50 *fixed += -d * lext[-d];
53 while (flip (&d) != LEFT);
55 if (Paper_column::is_breakable (l) && Paper_column::is_breakable (r))
57 Moment *dt = unsmob_moment (l->get_property ("measure-length"));
62 Real incr = robust_scm2double (me->get_property ("spacing-increment"), 1);
64 *space = *fixed + incr * double (mlen.main_part_ / options->global_shortest_) * 0.8;
68 Moment dt = Paper_column::when_mom (r) - Paper_column::when_mom (l);
70 if (dt == Moment (0, 0))
73 In this case, Staff_spacing should handle the job,
74 using dt when it is 0 is silly.
76 *space = *fixed + 0.5;
81 *space = *fixed + options->get_duration_space (dt.main_part_, &dummy);
87 get_measure_length (Grob *column)
89 Grob * sys = column->get_parent (X_AXIS);
91 extract_grob_set (sys, "columns", cols);
93 vsize col_idx = Paper_column::get_rank (column);
97 if (Moment *len = unsmob_moment (cols[col_idx]->get_property ("measure-length")))
102 while (col_idx-- != 0);
108 Spacing_spanner::note_spacing (Grob *me, Grob *lc, Grob *rc,
109 Spacing_options const *options,
114 Moment shortest_playing_len = 0;
115 SCM s = lc->get_property ("shortest-playing-duration");
117 if (unsmob_moment (s))
118 shortest_playing_len = *unsmob_moment (s);
120 if (! shortest_playing_len.to_bool ())
122 programming_error ("cannot find a ruling note at: " + Paper_column::when_mom (lc).to_string ());
123 shortest_playing_len = 1;
126 Moment lwhen = Paper_column::when_mom (lc);
127 Moment rwhen = Paper_column::when_mom (rc);
129 Moment delta_t = rwhen - lwhen;
132 when toying with mmrests, it is possible to have musical
133 column on the left and non-musical on the right, spanning
136 TODO: efficiency: measure length can be cached, or stored as
137 property in paper-column.
140 if (Moment *measure_len = get_measure_length (lc))
142 delta_t = min (delta_t, *measure_len);
145 The following is an extra safety measure, such that
146 the length of a mmrest event doesn't cause havoc.
148 shortest_playing_len = min (shortest_playing_len, *measure_len);
152 if (delta_t.main_part_ && !lwhen.grace_part_)
154 dist = options->get_duration_space (shortest_playing_len.main_part_,
156 dist *= double (delta_t.main_part_ / shortest_playing_len.main_part_);
158 else if (delta_t.grace_part_)
161 Crude hack for spacing graces: we take the shortest space
162 available (namely the space for the global shortest note), and
163 multiply that by grace-space-factor
165 dist = options->get_duration_space (options->global_shortest_, expand_only) / 2.0;
166 Grob *grace_spacing = unsmob_grob (lc->get_object ("grace-spacing"));
169 Spacing_options grace_opts;
170 grace_opts.init_from_grob (grace_spacing);
172 dist = grace_opts.get_duration_space (delta_t.grace_part_, &bla);