Random.cpp

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#include <openmodeller/Random.hh>
#include <openmodeller/os_specific.hh>

#include <stdlib.h>


/********************************************************/
/************************ Random ************************/

int Random::_initialized = 0;


/*******************/
/*** Constructor ***/

Random::Random()
{
  if ( ! _initialized )
    _initialized = initRandom();
}


/********************/
/*** get (double) ***/
double
Random::get( double min, double max )
{
  return( (max-min) * random() + min );
}

double
Random::get( double max )
{
  return( max * random() );
}


/***************************/
/*** operator() (double) ***/
double
Random::operator()( double min, double max )
{
  return( (max-min) * random() + min );
}

double
Random::operator()( double max )
{
  return( max * random() );
}


/*****************/
/*** get (int) ***/
int
Random::get( int min, int max )
{
  return( int((max-min) * random()) + min );
}

int
Random::get( int max )
{
  return( int(max * random()) );
}


/************************/
/*** operator() (int) ***/
int
Random::operator()( int min, int max )
{
  return( int((max-min) * random()) + min );
}

int
Random::operator()( int max )
{
  return( int(max * random()) );
}


/*******************/
/*** get  (long) ***/
long
Random::get( long min, long max )
{
  return( long((max-min) * random()) + min );
}

long
Random::get( long max )
{
  return( long(max * random()) );
}


/**************************/
/*** operator()  (long) ***/
long
Random::operator()( long min, long max )
{
  return( long((max-min) * random()) + min );
}

long
Random::operator()( long max )
{
  return( long(max * random()) );
}


/****************/
/*** discrete ***/
double
Random::discrete( float range, float dim_interv )
{
  double d = 2.0 * range / dim_interv;
  int k = int( (d + 1) * random() );
  return( k * dim_interv - range );
}


/**************/
/*** random ***/
double
Random::random()
{
  return ::rand() / (RAND_MAX + 1.0);
}