/**
* Updates the movement direction (see NavAgentHelper) according to the
* pheromones located near the agent.
*
* Combat/Harvest pheromones are only taken into account, if the task of the agent
* is combat and harvest respectively.
*
* Also: Combat/Harvest pheromones are ignored in certain states. Repellant pheromones
* are taken into account in every state.
*/
void Update()
{
_currentSmellAngleCos = Mathf.Cos(_agentConfiguration.smellAngle);
UpdatePheromoneSensor();
Vector3 attractionDirection = new Vector3();
if (_states.IsIdling())
{
_previousState = EAntStates.Idle;
}
// Only take harvest/combat pheromones into account if the agent is idling or following pheromones.
if (_states.IsIdling() || _states.IsFollowingPheromone())
{
if (_states.GetTask() == EAntTasks.HarvestFood && _previousState != EAntStates.ReturnToBase)
{
attractionDirection = AggregateMovementDirection(EPheromoneTypes.Food);
}
else if (_states.GetTask() == EAntTasks.Attack)
{
attractionDirection = AggregateMovementDirection(EPheromoneTypes.Attack);
}
}
// Always take repellant pheromones into account.
Vector3 repulsionDirection = AggregateMovementDirection(EPheromoneTypes.Repellant);
// If pheromones influence movement direction, set this direction and switch
// to pheromone following state if necessary.
if (attractionDirection.sqrMagnitude > 0f || repulsionDirection.sqrMagnitude > 0f)
{
_navHelper.SetDirection(0.01f * attractionDirection + 0.99f * repulsionDirection);
if (!_states.IsFollowingPheromone())
{
// Save the current state so we can restore status quo lateron.
_previousState = _states.currentState;
_states.currentState = EAntStates.FollowPheromone;
}
}
// Switch back to previous state, if no longer following pheromones.
else if (_states.IsFollowingPheromone())
{
_states.currentState = _previousState;
}
// Debug.DrawLine (transform.position, transform.position + Quaternion.Euler(0f, GlobalAntConfiguration.smellAngle * Mathf.Rad2Deg, 0f) * transform.forward * _currentSmellDistance);
// Debug.DrawLine (transform.position, transform.position + Quaternion.Euler(0f, -GlobalAntConfiguration.smellAngle * Mathf.Rad2Deg, 0f) * transform.forward * _currentSmellDistance);
}
void Update()
{
idleLocationChangeTimer += Time.deltaTime;
if (idleLocationChangeTimer >= idleLocationChangeInterval)
{
// Determine a random angle.
float randomAngle = Random.Range(-idleRandomAngle, idleRandomAngle);
// Rotate current direction by this angle.
Vector3 randomDirection = Quaternion.Euler(0, randomAngle, 0) * transform.forward;
navHelper.SetDirection(randomDirection);
idleLocationChangeTimer = 0.0f;
}
}
/**
* Begin to harvest the resource.
*
* This method is called by the AgentResourceSensor when it detects a
* resource.
*/
public void StartHarvesting(Collider other)
{
if (_states.GetTask() != EAntTasks.HarvestFood)
{
return;
}
ResourceSource resourceSource = other.GetComponent <ResourceSource> ();
if (resourceSource)
{
_navHelper.SetDirection(other.transform.position - transform.position);
_currentSource = resourceSource;
_inventory.resourceType = resourceSource.resourceType;
_harvestTimer = 0.0f;
_states.currentState = EAntStates.Harvesting;
}
}
/**
* Combating agents circle around their enemies. This method recalculates
* a random point inside this circle to which the agent moves.
*/
void DoCombatCircling()
{
GameObject target = _attack.GetCurrentTarget();
// Sanity check. THis is acutally not reqiured, since DoCombatCircling() is only
// invoked when the agent is _inCombat. The integrity of this state is ensured by
// the Update() method.
if (!target)
{
return;
}
// Orbit around enemy to continue attack and spread pheromones
Vector2 randomCircle = Random.insideUnitCircle;
Vector3 randomPoint = new Vector3(randomCircle.x, 0, randomCircle.y);
randomPoint = target.transform.position + randomPoint.normalized * _randomRadius;
_navHelper.SetDirection(randomPoint - transform.position);
}
/**
* Sets the movement direction of the agent to the center of the base.
*/
void FixedUpdate()
{
Vector3 homeDirection = agentBase.transform.position - transform.position;
navHelper.SetDirection(0.9f * navHelper.GetDirection() + 0.01f * homeDirection);
}