/// <summary>
/// Uninitializes attack state after completing animation
/// </summary>
void ExitAttack()
{
// darken agent and initializes cooldown timer
mySpriteRenderer.material.SetVector("_HSVAAdjust", cooldownHSV);
waitCounter = attackCooldown;
// set animation triggers and transition to wait state
myAnimator.SetTrigger("OnWaitTrigger");
myAnimator.ResetTrigger("OnAttackTrigger");
currState = ChaseStates.Wait;
}
/// <summary>
/// Used for initialization
/// </summary>
void Awake()
{
// retrieve components from agent
myRigidbody = GetComponent <Rigidbody2D>();
mySpriteRenderer = GetComponent <SpriteRenderer>();
myAnimator = GetComponent <Animator>();
sightTrigger = GetComponent <CircleCollider2D>();
// initialize agent and set internal variables
currState = startingState;
sightTrigger.isTrigger = true;
standardHSV = mySpriteRenderer.material.GetVector("_HSVAAdjust");
ignoreLayerMask = ~(1 << 12);
}
/// <summary>
/// Updates agent as it waits for cooldown before returning to idle state
/// </summary>
void UpdateWait()
{
// gradually slow agent to a halt
myRigidbody.velocity = Vector2.Lerp(myRigidbody.velocity, Vector2.zero, Time.deltaTime);
// decrease wait counter by time between frames
waitCounter -= Time.deltaTime;
// after waiting specific time, transition to idle
if (waitCounter <= 0)
{
currState = ChaseStates.Idle;
}
}
/// <summary>
/// Updates agent as it waits idly
/// </summary>
void UpdateIdle()
{
// slow agent to halt and lerp color to normal
myRigidbody.velocity = Vector2.Lerp(myRigidbody.velocity, Vector2.zero, Time.deltaTime);
mySpriteRenderer.material.SetVector("_HSVAAdjust",
Vector4.Lerp(mySpriteRenderer.material.GetVector("_HSVAAdjust"), standardHSV, Time.deltaTime));
// if agent has a target that they can see
if (targetTransform != null && CanSeeTarget())
{
// set animation triggers
myAnimator.SetTrigger("OnPursueTrigger");
myAnimator.ResetTrigger("OnIdleTrigger");
// move to pursue state
currState = ChaseStates.Pursue;
EnterPursue();
}
}
/// <summary>
/// Updates agent as it pursues its target
/// </summary>
void UpdatePursue()
{
// if agent can longer see target or has no target to pursue
if (!(targetTransform != null && CanSeeTarget()))
{
// set animation triggers
myAnimator.SetTrigger("OnIdleTrigger");
myAnimator.ResetTrigger("OnPursueTrigger");
// move to idle animation
currState = ChaseStates.Idle;
// return from this method to avoid target calculations
return;
}
// lerp agent's color to normal
mySpriteRenderer.material.SetVector("_HSVAAdjust",
Vector4.Lerp(mySpriteRenderer.material.GetVector("_HSVAAdjust"), standardHSV, Time.deltaTime));
// find distance from agent to target
float distToTarget = (transform.position - targetTransform.position).magnitude;
// move agent to intercept target
float targetDisplacementAtIntercept = (distToTarget / Mathf.Max(0.1f, myRigidbody.velocity.magnitude)) * targetRigidbody.velocity.magnitude;
Vector3 interceptPoint = (Vector3)targetRigidbody.velocity.normalized * targetDisplacementAtIntercept + targetTransform.position;
myRigidbody.velocity = Vector2.Lerp(myRigidbody.velocity, (interceptPoint - transform.position).normalized * AgentSpeed, Time.deltaTime);
// if agent is within attack range
if (distToTarget <= attackRange)
{
// set animation triggers
myAnimator.SetTrigger("OnAttackTrigger");
myAnimator.ResetTrigger("OnPursueTrigger");
// move to attack state
currState = ChaseStates.Attack;
EnterAttack();
}
}