X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fmisc.cc;h=f104f98baa7be06dc611011d5995d97bddb72fb5;hb=0b544cfb7332615ef809b71b57ab656741311ae1;hp=adcf536ad26dc9130d215ec1f4d42f74d2e384f8;hpb=7aabfb20c46e0a1de41698ddc6859ccd3a6dea85;p=lilypond.git

diff --git a/lily/misc.cc b/lily/misc.cc
index adcf536ad2..f104f98baa 100644
--- a/lily/misc.cc
+++ b/lily/misc.cc
@@ -1,36 +1,116 @@
 /*
-  misc.cc -- implement various stuff
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Jan Nieuwenhuizen <janneke@gnu.org>
 
-  (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-    Jan Nieuwenhuizen <janneke@gnu.org>
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <math.h>
+#include <complex>
+
 #include "misc.hh"
+#include "offset.hh"
+#include "warn.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);
+}
+
+/*
+  0 at 0,  1 at standard_x, and increasing thereafter.
+ */
+Real
+convex_amplifier (Real standard_x, Real increase_factor, Real x)
+{
+  return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0);
+}
+
+string
+camel_case_to_lisp_identifier (const string &in)
+{
+  vector<char> out;
+
+  /* don't add '-' before first character */
+  out.push_back (char (tolower (in[0])));
+
+  for (size_t inpos = 1; inpos < in.size (); inpos++)
+    {
+      if (isupper (in[inpos]))
+        out.push_back ('-');
+      out.push_back ( char (tolower (in[inpos])));
+    }
+
+  string result (&out[0], out.size ());
+  replace_all (&result, '_', '-');
+
+  return result;
+}
+
+Offset
+get_point_in_y_direction (Offset orig, Real slope, Real dist, Direction dir)
+{
+  if (slope == infinity_f)
+    return orig + Offset (dir * dist, 0.0);
+
+  Real x = slope == 0.0 ? 1.0 * dir : 1.0 * sign (slope) * dir;
+  Real y = slope * x;
+  Real angle = atan2 (y, x);
+
+  complex<Real> orig_c (orig[X_AXIS], orig[Y_AXIS]);
+  complex<Real> to_move = polar (dist, angle);
+  complex<Real> res = orig_c + to_move;
+
+  return Offset (real (res), imag (res));
+}