movement

Class RandomDirection

java.lang.Object

movement.MovementModel

movement.RandomDirection

Direct Known Subclasses:

ModifiedRandomDirection

public class RandomDirection
extends MovementModel

Random Direction movement model as described in: Elizabeth M. Royer, P. Michael Melliar-Smith, and Louise E. Moser, "An Analysis of the Optimum Node Density for Ad hoc Mobile Networks"

Nodes will start at a random place on the simulation area and pick a random direction and follow it to the edge of the simulation area. They will then pause and pick another direction to go in until they hit the edge again.

Field Summary

Fields inherited from class movement.MovementModel

comBus, DEF_SPEEDS, DEF_WAIT_TIMES, host, maxSpeed, maxWaitTime, minSpeed, minWaitTime, MOVEMENT_MODEL_NS, rng, RNG_SEED, SPEED, WAIT_TIME, WORLD_SIZE

Constructor Summary

Constructors

Constructor and Description
RandomDirection(RandomDirection other)
RandomDirection(Settings settings)

Method Summary

Methods

Modifier and Type	Method and Description
Coord	getInitialLocation() Returns a new initial placement for a node
Path	getPath() Returns a new path by this movement model or null if no new path could be constructed at the moment (node should wait where it is).
protected double	getTravelFraction() Returns the fraction of the path to follow towards the edge.
MovementModel	replicate() Creates a replicate of the movement model.

Methods inherited from class movement.MovementModel

generateSpeed, generateWaitTime, getComBus, getHost, getMaxX, getMaxY, isActive, nextPathAvailable, reset, setComBus, setHost, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomDirection

public RandomDirection(Settings settings)

RandomDirection

public RandomDirection(RandomDirection other)

Method Detail

getPath

public Path getPath()

Description copied from class: MovementModel

Returns a new path by this movement model or null if no new path could be constructed at the moment (node should wait where it is). A new path should not be requested before the destination of the previous path has been reached.

Specified by:

getPath in class MovementModel

Returns:

A new path or null

getInitialLocation

public Coord getInitialLocation()

Description copied from class: MovementModel

Returns a new initial placement for a node

Specified by:

getInitialLocation in class MovementModel

Returns:

The initial coordinates for a node

replicate

public MovementModel replicate()

Description copied from class: MovementModel

Creates a replicate of the movement model.

Specified by:

replicate in class MovementModel

Returns:

A new movement model with the same settings as this model

getTravelFraction

protected double getTravelFraction()

Returns the fraction of the path to follow towards the edge. This is called after the direction of travel has been picked and the path towards the edge calculated. Returning 1.0 causes the node to travel all the way to the edge, returning 0.5 would cause the node to travel half way, etc.

Returns:

the fraction of the path to follow towards the edge of the simulation area