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rngen.h

/*
    Copyright (C) 2003 Fons Adriaensen <fons.adriaensen@skynet.be>
    
    This program 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 2 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#ifndef __RNGEN_H
#define     __RNGEN_H


#include "itypes.h"


00027 class Rngen
{
public:

  Rngen (void);

  void init (U32 s);

  U32 irand (void)
  {
    U32 r;

    if (++_i == 55) _i = 0;
    if (_i < 24) r = _a [_i] += _a [_i + 31];
    else         r = _a [_i] += _a [_i - 24];
    return r;
  }

  double  urand (void) { return irand () / _p32; }
  double  grand (void);
  void    grand (double *x, double *y);
  float   urandf (void) { return irand () / _p32f; }
  float   grandf (void);
  void    grandf (float  *x, float *y);

  ~Rngen (void);
  Rngen (const Rngen&);           // disabled, not to be used
  Rngen& operator=(const Rngen&); // disabled, not to be used

private:
  
  U32     _a [55];
  int     _i;
  bool    _md;
  bool    _mf;
  double  _vd;
  float   _vf;

  static const double _p31;
  static const double _p32;
  static const float _p31f;
  static const float _p32f;
};


#endif

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