2 spacing-basic.cc -- implement Spacing_spanner, simplistic spacing routines
4 source file of the GNU LilyPond music typesetter
6 (c) 2005--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "spacing-spanner.hh"
11 #include "paper-column.hh"
15 LilyPond spaces by taking a simple-minded spacing algorithm, and
16 adding subtle adjustments to that. This file does the simple-minded
20 The one-size-fits all spacing. It doesn't take into account
21 different spacing wishes from one to the next column.
24 Spacing_spanner::standard_breakable_column_spacing (Grob *me, Item *l, Item *r,
25 Real *fixed, Real *space,
26 Spacing_options const *options)
30 Drul_array<Item *> cols (l, r);
34 if (!Paper_column::is_musical (cols[d]))
37 Tied accidentals over barlines cause problems, so lets see
38 what happens if we do this for non musical columns only.
40 Interval lext = cols[d]->extent (cols [d], X_AXIS);
41 if (!lext.is_empty ())
42 *fixed += -d * lext[-d];
45 while (flip (&d) != LEFT);
47 if (Paper_column::is_breakable (l) && Paper_column::is_breakable (r))
49 Moment *dt = unsmob_moment (l->get_property ("measure-length"));
54 Real incr = robust_scm2double (me->get_property ("spacing-increment"), 1);
56 *space = *fixed + incr * double (mlen.main_part_ / options->global_shortest_) * 0.8;
60 Moment dt = Paper_column::when_mom (r) - Paper_column::when_mom (l);
62 if (dt == Moment (0, 0))
65 In this case, Staff_spacing should handle the job,
66 using dt when it is 0 is silly.
68 *space = *fixed + 0.5;
73 *space = *fixed + options->get_duration_space (dt.main_part_, &dummy);
79 Spacing_spanner::note_spacing (Grob *me, Grob *lc, Grob *rc,
80 Spacing_options const *options,
85 Moment shortest_playing_len = 0;
86 SCM s = lc->get_property ("shortest-playing-duration");
88 if (unsmob_moment (s))
89 shortest_playing_len = *unsmob_moment (s);
91 if (! shortest_playing_len.to_bool ())
93 programming_error ("can't find a ruling note at " + Paper_column::when_mom (lc).to_string ());
94 shortest_playing_len = 1;
97 Moment lwhen = Paper_column::when_mom (lc);
98 Moment rwhen = Paper_column::when_mom (rc);
100 Moment delta_t = rwhen - lwhen;
101 if (!Paper_column::is_musical (rc))
104 when toying with mmrests, it is possible to have musical
105 column on the left and non-musical on the right, spanning
109 Moment *dt = unsmob_moment (rc->get_property ("measure-length"));
112 delta_t = min (delta_t, *dt);
115 The following is an extra safety measure, such that
116 the length of a mmrest event doesn't cause havoc.
118 shortest_playing_len = min (shortest_playing_len, *dt);
123 if (delta_t.main_part_ && !lwhen.grace_part_)
125 dist = options->get_duration_space (shortest_playing_len.main_part_,
127 dist *= double (delta_t.main_part_ / shortest_playing_len.main_part_);
129 else if (delta_t.grace_part_)
132 Crude hack for spacing graces: we take the shortest space
133 available (namely the space for the global shortest note), and
134 multiply that by grace-space-factor
136 dist = options->get_duration_space (options->global_shortest_, expand_only) / 2.0;
137 Grob *grace_spacing = unsmob_grob (lc->get_object ("grace-spacing"));
140 Spacing_options grace_opts;
141 grace_opts.init_from_grob (grace_spacing);
144 dist = grace_opts.get_duration_space (delta_t.grace_part_, &bla);