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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 2005--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "spacing-spanner.hh"
#include "spacing-options.hh"
#include "moment.hh"
#include "paper-column.hh"
#include "warn.hh"
#include "pointer-group-interface.hh"
#include "system.hh"
#include "spacing-interface.hh"
#include "spring.hh"
/*
LilyPond spaces by taking a simple-minded spacing algorithm, and
adding subtle adjustments to that. This file does the simple-minded
spacing routines.
*/
/*
The one-size-fits all spacing. It doesn't take into account
different spacing wishes from one to the next column.
*/
Spring
Spacing_spanner::standard_breakable_column_spacing (Grob *me, Item *l, Item *r, Spacing_options const *options)
{
Real min_dist = max (0.0, Paper_column::minimum_distance (l, r));
if (Paper_column::is_breakable (l) && Paper_column::is_breakable (r))
{
Moment *dt = unsmob<Moment> (l->get_property ("measure-length"));
Moment mlen (1);
if (dt)
mlen = *dt;
Real incr = robust_scm2double (me->get_property ("spacing-increment"), 1);
Real space = incr * double (mlen.main_part_ / options->global_shortest_) * 0.8;
Spring spring = Spring (min_dist + space, min_dist);
/*
By default, the spring will have an inverse_stretch_strength of space+min_dist.
However, we don't want stretchability to scale with min_dist or else an
empty first measure on a line (which has a large min_dist because of the clef)
will stretch much more than an empty measure later in the line.
*/
spring.set_inverse_stretch_strength (space);
return spring;
}
Moment dt = Paper_column::when_mom (r) - Paper_column::when_mom (l);
Real ideal;
if (dt == Moment (0, 0))
{
/*
In this case, Staff_spacing should handle the job,
using dt when it is 0 is silly.
*/
ideal = min_dist + 0.5;
}
else
ideal = min_dist + options->get_duration_space (dt.main_part_);
return Spring (ideal, min_dist);
}
Moment *
get_measure_length (Grob *column)
{
Grob *sys = column->get_parent (X_AXIS);
extract_grob_set (sys, "columns", cols);
vsize col_idx = Paper_column::get_rank (column);
do
{
if (Moment *len = unsmob<Moment> (cols[col_idx]->get_property ("measure-length")))
{
return len;
}
}
while (col_idx-- != 0);
return 0;
}
/* Basic spring based on duration alone */
Spring
Spacing_spanner::note_spacing (Grob * /* me */,
Grob *lc,
Grob *rc,
Spacing_options const *options)
{
Moment shortest_playing_len = 0;
SCM s = lc->get_property ("shortest-playing-duration");
if (unsmob<Moment> (s))
shortest_playing_len = *unsmob<Moment> (s);
if (! shortest_playing_len.to_bool ())
{
programming_error ("cannot find a ruling note at: " + Paper_column::when_mom (lc).to_string ());
shortest_playing_len = 1;
}
Moment lwhen = Paper_column::when_mom (lc);
Moment rwhen = Paper_column::when_mom (rc);
Moment delta_t = rwhen - lwhen;
/*
when toying with mmrests, it is possible to have musical
column on the left and non-musical on the right, spanning
several measures.
TODO: efficiency: measure length can be cached, or stored as
property in paper-column.
*/
if (Moment *measure_len = get_measure_length (lc))
{
delta_t = min (delta_t, *measure_len);
/*
The following is an extra safety measure, such that
the length of a mmrest event doesn't cause havoc.
*/
shortest_playing_len = min (shortest_playing_len, *measure_len);
}
Spring ret;
if (delta_t.main_part_ && !lwhen.grace_part_)
{
// A spring of length and stiffness based on the controlling duration
Real len = options->get_duration_space (shortest_playing_len.main_part_);
Real min = options->increment_; // canonical notehead width
// The portion of that spring proportional to the time between lc and rc
Real fraction = (delta_t.main_part_ / shortest_playing_len.main_part_);
ret = Spring (fraction * len, fraction * min);
// Stretch proportional to the space between canonical bare noteheads
ret.set_inverse_stretch_strength (fraction * max (0.1, (len - min)));
}
else if (delta_t.grace_part_)
{
Grob *grace_spacing = unsmob<Grob> (lc->get_object ("grace-spacing"));
if (grace_spacing)
{
Spacing_options grace_opts;
grace_opts.init_from_grob (grace_spacing);
Real len = grace_opts.get_duration_space (delta_t.grace_part_);
Real min = grace_opts.increment_;
ret = Spring (len, min);
// Grace notes should not stretch very much
ret.set_inverse_stretch_strength (grace_opts.increment_ / 2.0);
}
else // Fallback to the old grace spacing: half that of the shortest note
ret = Spring (options->
get_duration_space (options->global_shortest_) / 2.0,
options->increment_ / 2.0);
}
return ret;
}
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