source: cpp/frams/util/rndutil.h @ 215

// This file is a part of the Framsticks GDK.
// Copyright (C) 1999-2014  Maciej Komosinski and Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.framsticks.com/ for further information.

#ifndef _RNDUTIL_H_
#define _RNDUTIL_H_

#include <common/nonstd.h>
#include "math.h"

/** @file rndutil.h various functions */

/** @param x change seed if x<=0
    @return random value [0..x-1] if x>0 */
unsigned short pseudornd(short x);

double CustomRnd(double*);
// the parameter is a table which describes the random distribution:
// e.g.
// double x[]={ 3,     // 3 intervals
//  -10,-1,            // (each of them has always uniform distribution and equal probability of being selected)
//  -1, 1,
//   1,10, };

class RandomGener
{
   public:
      RandomGener() {isNextGauss=0;}
      static double Uni(double begin, double end); ///< uniform excluding 'end' boundary
      double GaussStd();
      double Gauss(double m,double s); ///< usually will not return further than 5*stdd
   private:
      int isNextGauss;
      double nextGauss;
};

extern RandomGener RndGen;

#endif