X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fmisc.cc;h=e7c3063df234c6ce79bca6185bf9358e837e401b;hb=7dcae7597fae14ce5c4e2e7d50c2709d162b7332;hp=370164c7ed5aaac1e73b49bbf6a65557f9653410;hpb=667d9bdb6227dd10819599c6d069a5eeb67eedd7;p=lilypond.git

diff --git a/lily/misc.cc b/lily/misc.cc
index 370164c7ed..e7c3063df2 100644
--- a/lily/misc.cc
+++ b/lily/misc.cc
@@ -3,34 +3,55 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-    Jan Nieuwenhuizen <janneke@gnu.org>
+  (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Jan Nieuwenhuizen <janneke@gnu.org>
 */
 
-#include <math.h>
+
 #include "misc.hh"
 
 /*
-  Return the 2-log, rounded down 
- */
+  Return the 2-log, rounded down
+*/
 int
 intlog2 (int d)
 {
   assert (d);
-  int i=0;
-  while ((d != 1)) 
+  int i = 0;
+  while ((d != 1))
     {
       d /= 2;
       i++;
     }
-  
-  assert (! (d/2));
+
+  assert (! (d / 2));
   return i;
 }
 
 double
 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);
 }
 
+
+
+/*
+   0 at threshold,  1 at 0, with 1/x falloff.
+ */
+Real
+peak_around (Real epsilon,  Real threshold, Real x)
+{
+  if (x < 0)
+    return 1.0;
+  return max (- epsilon * (x - threshold) / ((x + epsilon)  * threshold), 0.0);
+}