def seek(agent,
targetPosition):
maxSpeed = agent.getMaxSpeed()
agentPosition = agent.getPosition()
agentVelocity = agent.getVelocity()
agentToTarget = calculate.subtractPoints(targetPosition,
agentPosition)
desiredVelocity = vector.setMagnitude(agentToTarget,
maxSpeed)
return calculate.subtractVectors(desiredVelocity,
agentVelocity)
def flee(agent,
targetPosition,
evadeDistanceSquared=None):
steeringController = agent.getSteeringController()
agentPosition = agent.getPosition()
agentMaxSpeed = agent.getMaxSpeed()
agentVelocity = agent.getVelocity()
agentToTarget = calculate.subtractPoints(agentPosition,
targetPosition)
distanceSquaredToTarget = vector.getMagnitudeSquared(agentToTarget)
if (evadeDistanceSquared is not None and
distanceSquaredToTarget > evadeDistanceSquared):
return (0, 0)
desiredVelocity = vector.setMagnitude(agentToTarget,
agentMaxSpeed)
return calculate.subtractVectors(desiredVelocity,
agentVelocity)
def arrive(agent,
targetPosition,
decelerationFactor=None):
steeringController = agent.getSteeringController()
if decelerationFactor is None:
decelerationFactor = steeringController.decelerationFactor
agentPosition = agent.getPosition()
agentToTarget = calculate.subtractPoints(targetPosition,
agentPosition)
distanceToTarget = vector.getMagnitude(agentToTarget)
if round(distanceToTarget) > 0:
agentMaxSpeed = agent.getMaxSpeed()
agentVelocity = agent.getVelocity()
speed = distanceToTarget / decelerationFactor
speed = min(speed, agentMaxSpeed)
desiredVelocity = calculate.multiplyVectorAndScalar(agentToTarget,
speed / distanceToTarget)
return calculate.subtractVectors(desiredVelocity,
agentVelocity)
else:
return (0, 0)
