source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
- Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include <math.h>
+
#include "misc.hh"
+/*
+ Return the 2-log, rounded down
+*/
int
-intlog2(int d)
+intlog2 (int d)
{
assert (d);
- int i=0;
- while (!(d&1))
+ int i = 0;
+ 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);
+ return log (x) / log (2.0);
+}
+
+Real
+directed_round (Real f, Direction d)
+{
+ if (d < 0)
+ return floor (f);
+ else
+ return ceil (f);
}
-static int
-comp (Real const &a, Real const &b)
+
+/*
+ 0 at threshold, 1 at 0, with 1/x falloff.
+ */
+Real
+peak_around (Real epsilon, Real threshold, Real x)
{
- return sign (a-b);
+ if (x < 0)
+ return 1.0;
+ return max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
}
-Interval
-quantise_iv (Array<Real> positions, Real x)
+/*
+ 0 at 0, 1 at standard_x, and increasing thereafter.
+ */
+Real
+convex_amplifier (Real standard_x, Real increase_factor, Real x)
{
- positions.sort (comp);
- Real period = positions.top () - positions[0];
-
- int n = int ((x - positions[0]) / period);
- Real frac = (x - positions[0] ) - n * period;
+ return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0);
+}
- while (frac < 0)
- {
- frac += period;
- n --;
- }
+string
+camel_case_to_lisp_identifier (string in)
+{
+ vector<char> out;
- Real px = frac + positions[0];
- assert ( positions[0] <= px && px <= positions.top ());
- int i=0;
- for (; i < positions.size () - 1; i++)
+ /* don't add '-' before first character */
+ out.push_back (tolower (in[0]));
+
+ for (size_t inpos = 1; inpos < in.size (); inpos++)
{
- if (positions[i] <= px && px <= positions[i+1])
- break;
+ if (isupper (in[inpos]))
+ out.push_back ('-');
+ out.push_back (tolower (in[inpos]));
}
+
+ string result (&out[0], out.size ());
+ replace_all (result, '_', '-');
- return Interval (positions[i] , positions[i+1]) + period * n;
+ return result;
}
+