/******************************************************************/
/* Random.h                                                       */
/* -----------------------                                        */
/*                                                                */
/* The file defines a random number generator class.  This may    */
/*   not be the best random number generator around, but it works */
/*   reasonably well, and gives a portable random class for use   */
/*   on multiple platforms (which may or may not have rand() or   */
/*   drand48(), or they may be broken).                           */
/*                                                                */
/* Chris Wyman (10/26/2006)                                       */
/******************************************************************/
#include <math.h>
#include "Random.h"

Random::Random( unsigned long seed ) :
   maxshort( 65536L ), multiplier( 1194211693L ), adder( 12345L )
{
	randSeed = ( seed ? seed : (unsigned long)time(0) );
}

double Random::dRandom( void )
{
	randSeed = multiplier * randSeed + adder;
	return ((randSeed >> 16) % maxshort) / (double)maxshort;
}

float  Random::fRandom( void )
{
	randSeed = multiplier * randSeed + adder;
	return ((randSeed >> 16) % maxshort) / (float)maxshort;
}

unsigned short Random::sRandom ( void )
{
	randSeed = multiplier * randSeed + adder;
	return (unsigned short)((randSeed >> 16) % maxshort);
}

unsigned char Random::cRandom ( void )
{
	randSeed = multiplier * randSeed + adder;
	return (unsigned char)((randSeed >> 16) % 256L );
}

bool Random::bRandom ( void )
{
	randSeed = multiplier * randSeed + adder;
	return ((randSeed >> 16) & 0x00000001) > 0;  // check if the last bit is on or off
}