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KRandomSequence Class Reference

#include <krandomsequence.h>

List of all members.

Public Methods
	KRandomSequence (long lngSeed=0)
virtual	~KRandomSequence ()
	KRandomSequence (const KRandomSequence &a)
KRandomSequence &	operator= (const KRandomSequence &a)
void	setSeed (long lngSeed=1)
double	getDouble ()
unsigned long	getLong (unsigned long max)
bool	getBool ()
void	randomize (QGList *list)
void	modulate (int i)

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Detailed Description

A class to create a pseudo-random sequence

Given a seed number, this class will produce a sequence of pseudo-random numbers. This would typically be used in applications like games.

In general, you should instantiate a KRandomSequence object and pass along your seed number in the constructor. From then on, simply call getDouble or getLong to obtain the next number in the sequence.

Author:

Sean Harmer <sh@astro.keele.ac.uk>

Definition at line 37 of file krandomsequence.h.

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Constructor & Destructor Documentation

KRandomSequence::KRandomSequence (  long    lngSeed = 0 )

Creates a pseudo-random sequence based on the seed lngSeed. A Pseudo-random sequence is different for each seed but can be reproduced by starting the sequence with the same seed. If you need a single value which needs to be unpredictable, you need to use kapp->random() instead. Parameters: lngSeed  Seed to initialize the sequence with. If lngSeed is 0, the sequence is initialized with a value from KApplication::random().

virtual KRandomSequence::~KRandomSequence (    )  [virtual]

Standard destructor

KRandomSequence::KRandomSequence (  const KRandomSequence &    a )

Copy constructor

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Member Function Documentation

bool KRandomSequence::getBool (    )

Get a boolean from the pseudo-random sequence. Returns: a boolean which is either true or false

double KRandomSequence::getDouble (    )

Get the next number from the pseudo-random sequence. Returns: a psuedo-random double value between [0,1[

unsigned long KRandomSequence::getLong (  unsigned long    max )

Get the next number from the pseudo-random sequence. Returns: a pseudo-random integer value between [0, max[ with 0 <= max < 1.000.000

void KRandomSequence::modulate (  int    i )

Modulate the random sequence. If S(i) is the sequence of numbers that will follow given the current state after calling modulate(i), then S(i) != S(j) for i != j and S(i) == S(j) for i == j. This can be usefull in game situation where "undo" restores the state of the random sequence. If the game modulates the random sequence with the move chosen by the player, the random sequence will be identical whenever the player "redo"-s his or hers original move, but different when the player chooses another move. With this scenario "undo" can no longer be used to repeat a certain move over and over again until the computer reacts with a favourable response or to predict the response for a certain move based on the response to another move. Parameters: i  the sequence identified

KRandomSequence& KRandomSequence::operator= (  const KRandomSequence &    a )

Assignment

void KRandomSequence::randomize (  QGList *    list )

Put a list in random order. Parameters: list  the list whose order will be modified

void KRandomSequence::setSeed (  long    lngSeed = 1 )

Restart the sequence based on lngSeed. Parameters: lngSeed  Seed to initialize the sequence with. If lngSeed is 0, the sequence is initialized with a value from KApplication::random().

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The documentation for this class was generated from the following file:

• krandomsequence.h

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