model.agent.humanAgent.aatom.operationalLevel.action.movement.impl

Class HelbingMovementModule

java.lang.Object

model.agent.humanAgent.aatom.operationalLevel.action.movement.MovementModule

model.agent.humanAgent.aatom.operationalLevel.action.movement.impl.HelbingMovementModule

All Implemented Interfaces:

Updatable

public class HelbingMovementModule
extends MovementModule

The Helbing Model is an implementation of the Helbing (2000) paper. It uses 'social forces' to determine the next move.

Author:

S.A.M. Janssen

Field Summary

Fields

Modifier and Type	Field and Description
private static double	A Helbing constant A.
private static double	accelerationTime Helbing constant tau.
private static double	B Helbing constant B.
private static double	errorTerm An error term to prevent accumulating errors.
private static double	k Helbing constant k.
private static double	kappa Helbing constant kappa.
private boolean	onlyPassengers Specifies if only passengers are considered in the walking behavior.

Fields inherited from class model.agent.humanAgent.aatom.operationalLevel.action.movement.MovementModule

agent, currentVelocity, desiredSpeed, observationModule

Constructor Summary

Constructors

Constructor and Description
HelbingMovementModule(double desiredSpeed) Creates a Helbing model.
HelbingMovementModule(double desiredSpeed, boolean onlyPassengers) Creates a Helbing model.

Method Summary

Modifier and Type	Method and Description
private Vector	getAgentInteractionForce() Gets the agent interaction force.
private Vector	getInternalAccelerationForce() Gets the internal acceleration force.
Vector	getMove(int timeStep) Gets the next move.
private Vector	getPhysicalObstacleForce() Gets the physical obstacle force.
private Vector	getSingleAgentInteractionForce(HumanAgent other) The agent interaction force, is a force that other HumanAgents apply to us.
private Vector	getSinglePhysicalObstacleForce(PhysicalObject physicalObstacle) The physicalObstacle interaction force, is a force that physicalObstacles apply to us.
void	init(AatomHumanAgent agent, ObservationModule observationModule) Sets the agent.
private boolean	isInQueue() Determines if the agent is queuing.

Methods inherited from class model.agent.humanAgent.aatom.operationalLevel.action.movement.MovementModule

boundSpeed, getChair, getCurrentVelocity, getDesiredSpeed, getPosition, getStopMovingTime, getStopOrder, isSitting, setSitDown, setStopOrder, update

Methods inherited from class java.lang.Object

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

Field Detail

A

private static final double A

Helbing constant A.

See Also:

Constant Field Values

accelerationTime

private static final double accelerationTime

Helbing constant tau.

See Also:

Constant Field Values

B

private static final double B

Helbing constant B.

See Also:

Constant Field Values

errorTerm

private static final double errorTerm

An error term to prevent accumulating errors.

See Also:

Constant Field Values

k

private static final double k

Helbing constant k.

See Also:

Constant Field Values

kappa

private static final double kappa

Helbing constant kappa.

See Also:

Constant Field Values

onlyPassengers

private boolean onlyPassengers

Specifies if only passengers are considered in the walking behavior.

Constructor Detail

HelbingMovementModule

public HelbingMovementModule(double desiredSpeed)

Creates a Helbing model.

Parameters:

desiredSpeed - The desired speed.

HelbingMovementModule

public HelbingMovementModule(double desiredSpeed,
                             boolean onlyPassengers)

Creates a Helbing model.

Parameters:

desiredSpeed - The desired speed.

onlyPassengers - Only passengers are considered in the walking behavior or not.

Method Detail

getAgentInteractionForce

private Vector getAgentInteractionForce()

Gets the agent interaction force.

Returns:

The force.

getInternalAccelerationForce

private Vector getInternalAccelerationForce()

Gets the internal acceleration force.

Returns:

The force.

getMove

public Vector getMove(int timeStep)

Description copied from class: MovementModule

Gets the next move. When overriding this method, please ensure that you scalar multiply the generated vector with the timestep/1000.0, and update the field MovementModule.currentVelocity to the generated value.

Specified by:

getMove in class MovementModule

Parameters:

timeStep - The time step (in milliseconds).

Returns:

The next move.

getPhysicalObstacleForce

private Vector getPhysicalObstacleForce()

Gets the physical obstacle force.

Returns:

The force.

getSingleAgentInteractionForce

private Vector getSingleAgentInteractionForce(HumanAgent other)

The agent interaction force, is a force that other HumanAgents apply to us.

Parameters:

other - The other agent.

Returns:

The force.

getSinglePhysicalObstacleForce

private Vector getSinglePhysicalObstacleForce(PhysicalObject physicalObstacle)

The physicalObstacle interaction force, is a force that physicalObstacles apply to us.

Parameters:

physicalObstacle - The physicalObstacle.

Returns:

The force.

init

public void init(AatomHumanAgent agent,
                 ObservationModule observationModule)

Description copied from class: MovementModule

Sets the agent.

Overrides:

init in class MovementModule

Parameters:

agent - The agent.

observationModule - The observation module.

isInQueue

private boolean isInQueue()

Determines if the agent is queuing.

Returns:

True if it is, false otherwise.