2 misc.cc -- implement various stuff
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
14 Return the 2-log, rounded down
34 return log (x) /log (2.0);
39 comp (Real const &a, Real const &b)
45 quantise_iv (Array<Real> positions, Real x)
47 positions.sort (comp);
48 Real period = positions.top () - positions[0];
50 int n = int ((x - positions[0]) / period);
51 Real frac = (x - positions[0] ) - n * period;
59 Real px = frac + positions[0];
60 assert ( positions[0] <= px && px <= positions.top ());
62 for (; i < positions.size () - 1; i++)
64 if (positions[i] <= px && px <= positions[i+1])
68 return Interval (positions[i] , positions[i+1]) + period * n;