/// <summary>
/// Handles the case where the current Audio AiTarget contains a current Audio Threat.
/// </summary>
/// <returns>A new state or NONE if nothing needed to be handled</returns>
private AiStateType HandleAudioThreat()
{
AiStateType state = AiStateType.None;
AiThreatManager manager = zombieStateMachine.ThreatManager;
AiTarget audioThreat = zombieStateMachine.ThreatManager.CurrentAudioThreat;
if (manager.IsTargeting(AiTargetType.Visual_Food))
{
state = AiStateType.Alerted;
}
else if (manager.IsTargeting(AiTargetType.Audio))
{
// Get unique ID of the collider of our target
int currentID = zombieStateMachine.ThreatManager.CurrentTarget.GetColliderID();
// If this is the same light
if (currentID == zombieStateMachine.ThreatManager.CurrentAudioThreat.GetColliderID())
{
RepathToThreatIfNecessary(audioThreat);
state = AiStateType.Pursuit;
}
else
{
state = AiStateType.Alerted;
}
}
manager.TrackTarget(audioThreat);
return(state);
}
/// <summary>
/// Handles the case where the current visual threat is a Visual_light.
/// </summary>
/// <returns>A new state or NONE if nothing needed to be handled</returns>
private AiStateType HandleVisualLightThreats()
{
AiStateType state = AiStateType.None;
AiThreatManager manager = zombieStateMachine.ThreatManager;
AiTarget visualThreat = zombieStateMachine.ThreatManager.CurrentVisualThreat;
// and we currently have a lower priority target then drop into alerted
// mode and try to find source of light
if (manager.IsTargeting(AiTargetType.Audio) || manager.IsTargeting(AiTargetType.Visual_Food))
{
state = AiStateType.Alerted;
}
else if (manager.IsTargeting(AiTargetType.Visual_Light))
{
// Get unique ID of the collider of our target
int currentID = zombieStateMachine.ThreatManager.CurrentTarget.GetColliderID();
// If this is the same light
if (currentID == visualThreat.GetColliderID())
{
RepathToThreatIfNecessary(visualThreat);
state = AiStateType.Pursuit;
}
else
{
state = AiStateType.Alerted;
}
}
manager.TrackTarget(visualThreat);
return(state);
}
/// <summary>
/// Actions to take whenever a player threat is detected.
/// </summary>
/// <param name="playerCollider">The player collider that triggered the collision</param>
private void HandlePlayerThreat(Collider playerCollider)
{
AiThreatManager manager = zombieStateMachine.ThreatManager;
float distanceToThreat = Vector3.Distance(zombieStateMachine.Sensor.WorldPosition, playerCollider.transform.position);
// if the currently stored threat is not the player or it is the player and it's closer than what was last stored
if (!manager.DoesPlayerThreatExist() ||
(manager.DoesPlayerThreatExist() && IsCloserThanLastThreat(manager.CurrentVisualThreat, distanceToThreat)))
{
RaycastHit hitInfo;
if (IsColliderVisible(playerCollider, out hitInfo, playerLayerMask))
{
// it's close and in our FOV so store as the current most dangerous threat
this.zombieStateMachine.ThreatManager.TrackVisualThreat(
AiTargetType.Visual_Player,
playerCollider,
distanceToThreat
);
}
}
}
/// <summary>
/// Called by the state machine each frame.
/// </summary>
/// <returns>Either Idle or a new state based upon the threats that were processed</returns>
public override AiStateType OnUpdate()
{
IncrementTimer();
AiStateType state = GetDefaultStateType();
// if we got to this state, but its not hungry, go back to alert state
if (!zombieStateMachine.IsHungery())
{
zombieStateMachine.WaypointManager.TrackWayPoint();
state = AiStateType.Alerted;
}
else
{
AiThreatManager manager = zombieStateMachine.ThreatManager;
if (manager.DoesPlayerThreatExist() || manager.DoesLightThreatExist())
{
manager.TrackTarget(zombieStateMachine.ThreatManager.CurrentVisualThreat);
state = AiStateType.Alerted;
}
else if (manager.DoesAudioThreatExist())
{
manager.TrackTarget(zombieStateMachine.ThreatManager.CurrentAudioThreat);
state = AiStateType.Alerted;
}
else if (manager.IsTargeting(AiTargetType.Visual_Food))
{
if (IsZombieCurrentlyEating())
{
ReplenishSatisfaction();
}
}
FaceTargetGradually(this.slerpSpeed);
}
return(state);
}
/// <summary>
/// Initializes all of the threats/targets.
/// </summary>
private void InitializeThreatManager()
{
this.threatManager = new AiThreatManager(this.targetTrigger, this);
}
/// <summary>
/// Indicates whether or not the distance to the given threat is smaller then anything we may have
/// previously stored
/// </summary>
/// <param name="threat">The threat to test</param>
/// <param name="distanceToThreat">The pre-computed distance to the given threat</param>
/// <returns>true if a previous threat existed and zombie is now closer to it.</returns>
private bool IsCloserThanLastThreat(AiTarget threat, float distanceToThreat)
{
AiThreatManager manager = zombieStateMachine.ThreatManager;
return(threat.Type == AiTargetType.None || distanceToThreat < threat.Distance);
}