+
+/*
+ Get the measure wide ant for arithmetic spacing.
+*/
+Real
+Spacing_options::get_duration_space (Rational d) const
+{
+ Real ratio = d / global_shortest_;
+
+ if (ratio < 1.0)
+ {
+ /*
+ 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)}
+
+
+ */
+
+ return (shortest_duration_space_ + ratio - 1) * 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.
+ */
+
+ return (shortest_duration_space_ + log_2 (ratio)) * increment_;
+ }
+}
+