squidpony.squidmath

Class TorusCachePointHash

java.lang.Object

squidpony.squidmath.IPointHash.IntImpl

squidpony.squidmath.TorusCachePointHash

All Implemented Interfaces:

IPointHash

public class TorusCachePointHash
extends IPointHash.IntImpl

A group of similar methods for getting hashes of points based on int coordinates in 2, 3, 4, 5, or 6 dimensions and an int for state; here, points are considered toroidally wrapping, where the wrap happens at a power of two that is no greater than 1024. This implementation stores 6 caches of 1024 numbers each, where each cache is used for a different dimension, and XORs the values along with the seed before running through Thomas Wang's integer hash.

Nested Class Summary

Nested classes/interfaces inherited from interface squidpony.squidmath.IPointHash

IPointHash.IntImpl, IPointHash.LongImpl

Field Summary

Fields

Modifier and Type	Field and Description
protected int[]	cache
protected int	wrap

Fields inherited from class squidpony.squidmath.IPointHash.IntImpl

state

Constructor Summary

Constructors

Constructor and Description
TorusCachePointHash()
TorusCachePointHash(int state)
TorusCachePointHash(int state, int wrapAt)

Method Summary

Modifier and Type	Method and Description
static int	determineInt(int x) Thomas Wang's 2002 integer hash.
int	hashWithState(int x, int y, int state)
int	hashWithState(int x, int y, int z, int state)
int	hashWithState(int x, int y, int z, int w, int state)
int	hashWithState(int x, int y, int z, int w, int u, int state)
int	hashWithState(int x, int y, int z, int w, int u, int v, int state)
void	setState(int state)
void	setState(long state)

Methods inherited from class squidpony.squidmath.IPointHash.IntImpl

hash, hash, hash, hash, hash

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected final int[] cache

wrap

protected int wrap

Constructor Detail

TorusCachePointHash

public TorusCachePointHash()

TorusCachePointHash

public TorusCachePointHash(int state)

TorusCachePointHash

public TorusCachePointHash(int state,
                           int wrapAt)

Method Detail

setState

public void setState(int state)

Specified by:

setState in interface IPointHash

Overrides:

setState in class IPointHash.IntImpl

setState

public void setState(long state)

Specified by:

setState in interface IPointHash

Overrides:

setState in class IPointHash.IntImpl

determineInt

public static int determineInt(int x)

Thomas Wang's 2002 integer hash.

Parameters:

x - any int

Returns:

a usually different and very-scrambled int

hashWithState

public int hashWithState(int x,
                         int y,
                         int state)

hashWithState

public int hashWithState(int x,
                         int y,
                         int z,
                         int state)

hashWithState

public int hashWithState(int x,
                         int y,
                         int z,
                         int w,
                         int state)

hashWithState

public int hashWithState(int x,
                         int y,
                         int z,
                         int w,
                         int u,
                         int state)

hashWithState

public int hashWithState(int x,
                         int y,
                         int z,
                         int w,
                         int u,
                         int v,
                         int state)