/*
- spacing-options.cc -- implement Spacing_options
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2006--2010 Han-Wen Nienhuys <hanwen@lilypond.org>
- (c) 2006 Han-Wen Nienhuys <hanwen@lilypond.org>
+ 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-options.hh"
#include "spacing-spanner.hh"
#include "grob.hh"
+#include "misc.hh"
+#include "moment.hh"
+#include "spanner.hh"
void
Spacing_options::init_from_grob (Grob *me)
float_grace_columns_
= to_boolean (me->get_property ("strict-grace-spacing"));
shortest_duration_space_ = robust_scm2double (me->get_property ("shortest-duration-space"), 1);
+
+
+ Moment shortest_dur = robust_scm2moment (me->get_property ("common-shortest-duration"),
+ Moment (Rational (1,8), Rational (1,16)));
+
+ if (shortest_dur.main_part_)
+ global_shortest_ = shortest_dur.main_part_;
+ else
+ global_shortest_ = shortest_dur.grace_part_;
}
Spacing_options::Spacing_options ()
{
- increment_ = 1.2;
packed_ = false;
stretch_uniformly_ = false;
float_nonmusical_columns_ = false;
float_grace_columns_ = false;
+
shortest_duration_space_ = 2.0;
+ increment_ = 1.2;
global_shortest_ = Rational (1, 8);
}
+
+
+
+/*
+ Get the measure wide ant for arithmetic spacing.
+*/
+Real
+Spacing_options::get_duration_space (Rational d) const
+{
+ Real k = shortest_duration_space_;
+
+ if (d < global_shortest_)
+ {
+ /*
+ We don't space really short notes using the log of the
+ duration, since it would disproportionally stretches the long
+ notes in a piece. In stead, we use geometric spacing with constant 0.5
+ (i.e. linear.)
+
+ This should probably be tunable, to use other base numbers.
+
+ In Mozart hrn3 by EB., we have 8th note = 3.9 mm (total), 16th note =
+ 3.6 mm (total). head-width = 2.4, so we 1.2mm for 16th, 1.5
+ mm for 8th. (white space), suggesting that we use
+
+ (1.2 / 1.5)^{-log2(duration ratio)}
+
+
+ */
+ Rational ratio = d / global_shortest_;
+
+ return ((k - 1) + double (ratio)) * increment_;
+ }
+ else
+ {
+ /*
+ John S. Gourlay. ``Spacing a Line of Music, '' Technical
+ Report OSU-CISRC-10/87-TR35, Department of Computer and
+ Information Science, The Ohio State University, 1987.
+ */
+ Real log = log_2 (global_shortest_);
+ k -= log;
+
+ return (log_2 (d) + k) * increment_;
+ }
+}
+