include/lang/MiscInlineMath.h

   1 /*
   2         SuperCollider real time audio synthesis system
   3     Copyright (c) 2002 James McCartney. All rights reserved.
   4         http://www.audiosynth.com
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19 */
  20
  21 #ifndef LANG_MISCINLINEMATH_H
  22 #define LANG_MISCINLINEMATH_H
  23
  24 #define NUMPRIMES 6542
  25 long nthPrime(int n);
  26 long findPrime(int n);
  27 long prevPrime(int n);
  28 long nextPrime(int n);
  29
  30
  31 inline double linlin(double x, double a, double b, double c, double d)
  32 {
  33     if (x <= a) return c;
  34     if (x >= b) return d;
  35     return (x-a)/(b-a) * (d-c) + c;
  36 }
  37
  38 inline double explin(double x, double a, double b, double c, double d)
  39 {
  40     if (x <= a) return c;
  41     if (x >= b) return d;
  42     return (log(x/a)) / (log(b/a)) * (d-c) + c;
  43 }
  44
  45 inline double expexp(double x, double a, double b, double c, double d)
  46 {
  47     if (x <= a) return c;
  48     if (x >= b) return d;
  49     return pow(d/c, log(x/a)) / (log(b/a)) * c;
  50 }
  51
  52 inline double linexp(double x, double a, double b, double c, double d)
  53 {
  54     if (x <= a) return c;
  55     if (x >= b) return d;
  56     return pow(d/c, (x-a)/(b-a)) * c;
  57 }
  58
  59 #endif