protected IEnumerator ChangeStateCoroutine(AIBehaviourState newBehaviourState, float timeToStayInNewState = -1, float delay = -1)
{
if (newBehaviourState == currentBehaviourState)
{
yield break;
}
float timeToWait = delay;
float timeRemainingInNewState = timeToStayInNewState;
while (timeToWait > 0)
{
timeToWait -= Time.deltaTime;
yield return(null);
}
//Switch to new
SwitchState(newBehaviourState);
while (timeRemainingInNewState > 0)
{
timeRemainingInNewState -= Time.deltaTime;
yield return(null);
}
if (timeRemainingInNewState < 0 && timeToStayInNewState > 0)
{
//Switch back to previous
SwitchState(previousBehaviourState);
}
}
protected void SwitchState(AIBehaviourState newBehaviourState)
{
if (newBehaviourState == currentBehaviourState)
{
return;
}
previousBehaviourState = currentBehaviourState;
currentBehaviourState = newBehaviourState;
}
public virtual void Reset()
{
currentSubBehaviour = 0;
this.state = AIBehaviourState.Idle;
if (subbehaviours != null)
{
for (int index = 0; index < subbehaviours.Count; index++)
{
subbehaviours[index].Reset();
}
}
}
public virtual void OnBehaviourFinish(int finishedBehaviour)
{
// try to start next behaviour if there is something else
// if not, just finish this behaviour
if (finishedBehaviour == subbehaviours.Count - 1)
{
this.state = AIBehaviourState.Finished;
}
else
{
this.state = AIBehaviourState.Working;
currentSubBehaviour++;
}
}
public virtual void IterateSubBehaviours(GameTime gameTime)
{
if (subbehaviours.Count > 0)
{
// check state of the current subbehaviour
if (subbehaviours[currentSubBehaviour].State == AIBehaviourState.Idle ||
subbehaviours[currentSubBehaviour].State == AIBehaviourState.Working)
{
this.state = AIBehaviourState.Working;
subbehaviours[currentSubBehaviour].Iterate(gameTime);
}
else
{
if (subbehaviours[currentSubBehaviour].State == AIBehaviourState.Failed)
{
this.OnBehaviourFailure(currentSubBehaviour);
}
else if (subbehaviours[currentSubBehaviour].State == AIBehaviourState.Finished)
{
this.OnBehaviourFinish(currentSubBehaviour);
}
}
}
}
public void ChangeState(AIBehaviourState newBehaviourState, float timeToStayInNewState = -1, float delay = -1)
{
// if (changingStateCoroutine != null) StopCoroutine(changingStateCoroutine);
changingStateCoroutine = StartCoroutine(ChangeStateCoroutine(newBehaviourState, timeToStayInNewState, delay));
}
public AIBehaviour()
{
state = AIBehaviourState.Idle;
currentSubBehaviour = 0;
}
public virtual void OnBehaviourFailure(int failedBehaviour)
{
this.state = AIBehaviourState.Failed;
}
