source file of the GNU LilyPond music typesetter
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include <math.h>
-
-#include "item.hh"
#include "misc.hh"
-#include "moment.hh"
+/*
+ Return the 2-log, rounded down
+ */
int
-intlog2(int d) {
+intlog2 (int d)
+{
+ assert (d);
int i=0;
- while (!(d&1))
+ while ((d != 1))
{
- d/= 2;
- i++;
+ d/= 2;
+ i++;
}
- assert (!(d/2));
+
+ assert (! (d/2));
return i;
}
double
-log_2(double x) {
+log_2 (double x)
+{
return log (x) /log (2.0);
}
-#if 1
+
+static int
+comp (Real const &a, Real const &b)
+{
+ return sign (a-b);
+}
+
Interval
-itemlist_width (const Array<Item*> &its)
+quantise_iv (Array<Real> positions, Real x)
{
- Interval iv ;
- iv.set_empty();
-
- for (int j =0; j < its.size(); j++)
- {
- iv.unite (its[j]->width());
+ positions.sort (comp);
+ Real period = positions.top () - positions[0];
+
+ int n = int ((x - positions[0]) / period);
+ Real frac = (x - positions[0]) - n * period;
+ while (frac < 0)
+ {
+ frac += period;
+ n --;
+ }
+
+ Real px = frac + positions[0];
+ assert (positions[0] <= px && px <= positions.top ());
+ int i=0;
+ for (; i < positions.size () - 1; i++)
+ {
+ if (positions[i] <= px && px <= positions[i+1])
+ break;
}
- return iv;
-}
-#endif
+ return Interval (positions[i] , positions[i+1]) + period * n;
+}