unlekker.util
Class Rnd

java.lang.Object
  unlekker.util.Rnd

All Implemented Interfaces:

java.io.Serializable

public class Rnd
extends java.lang.Object
implements java.io.Serializable

unlekker.Rnd implements the Mersenne Twister, an advanced psuedorandom number generator with a period of 2^19937-1. It is an adaptation of Paul Houle's RngPack library.

See Also:

Serialized Form

Constructor Summary

Rnd()
Initialize random number generator.

Rnd(long seed)

Method Summary

boolean	probGt(float chance) Returns true if rndFloat(100) returns a result greater than the parameter "chance".
float	random() Returns a random value in the ranges [0..1>, [0..range> or [min..max> depending on the version used.
float	random(float range)
float	random(float min, float max)
boolean	randomBool() Randomly returns true or false.
int	randomInt(int range) Returns a random integer value in the range [0..range-1> or [min..max-1>.
int	randomInt(int min, int max)
void	randomSeed(long _seed)
void	randomSeedComplex(int[] array) Paul Houle: An alternative, more complete, method of seeding the pseudo random number generator.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Rnd

public Rnd()

Initialize random number generator. When called the first time the seed 0 will be used. An internal static variable is then incremented, so that the next instance will have seed 1 etc.

Rnd

public Rnd(long seed)

Method Detail

randomSeed

public void randomSeed(long _seed)

randomSeedComplex

public void randomSeedComplex(int[] array)

Paul Houle: An alternative, more complete, method of seeding the pseudo random number generator. array must be an array of 624 ints, and they can be any value as long as they're not *all* zero.

randomBool

public boolean randomBool()

Randomly returns true or false.

Returns:

boolean

probGt

public boolean probGt(float chance)

Returns true if rndFloat(100) returns a result greater than the parameter "chance".

Parameters:

chance - float

Returns:

boolean

random

public float random()

Returns a random value in the ranges [0..1>, [0..range> or [min..max> depending on the version used.

Returns:

float

random

public float random(float range)

random

public float random(float min,
                    float max)

randomInt

public int randomInt(int range)

Returns a random integer value in the range [0..range-1> or [min..max-1>.

Parameters:

min - int

max - int

Returns:

int

randomInt

public int randomInt(int min,
                     int max)