private void ChasePlayer()
{
stateText.text = "Chasing";
currentState = ZookeeperState.Chasing;
running = true;
nav.speed = runSpeed;
nav.SetDestination(player.transform.position);
}
private void ResumePatrol()
{
running = false;
nav.speed = walkSpeed;
stateText.text = "Patrolling";
currentState = ZookeeperState.Patrolling;
nav.SetDestination(waypoints[nextWaypoint]);
nextWaypoint++;
if (nextWaypoint >= waypoints.Length)
{
nextWaypoint = 0;
}
}
// Update is called once per frame
void Update()
{
//apply walk/run animation while moving
//most reliable way to get speed is based on position difference from last frame
Vector3 curMove = transform.position - previousPosition;
var curSpeed = curMove.magnitude / Time.deltaTime;
previousPosition = transform.position;
//determine how to scale the velocity to set the animation parameter.
//walking and running are part of a blend tree, where walking is set to 0.5 vSpeed, and run is 1 VSpeed.
//so, scale running to 1 and scale walking to 0.5
var scale = running ? runSpeed : walkSpeed * 2;
anim.SetFloat("VSpeed", curSpeed / scale);
//check if the zookeeper can see the player
bool seePlayer = CanSeePlayer();
//AI state machine
switch (currentState)
{
case ZookeeperState.Patrolling:
if (seePlayer)
{
ChasePlayer();
}
else
{
//check if we have reached our current waypoint
if (arrivedAtWaypoint())
{
//yep, wait here for pause time
waypointArriveTime = Time.time;
stateText.text = "Paused";
currentState = ZookeeperState.Paused;
}
}
break;
case ZookeeperState.Paused:
if (seePlayer)
{
ChasePlayer();
}
else if (Time.time > waypointArriveTime + waypointPauseTime)
{
ResumePatrol();
}
break;
case ZookeeperState.Chasing:
if (!seePlayer)
{
//lost sight of the player while chasing him.
//keep going toward current waypoint (his last known position)
//set up timeout to give up the search
lostTime = Time.time;
stateText.text = "Searching";
currentState = ZookeeperState.Searching;
}
else
{
nav.SetDestination(player.transform.position);
}
break;
case ZookeeperState.Searching:
if (seePlayer)
{
ChasePlayer();
}
if (Time.time > lostTime + MaxSearchTime)
{
ResumePatrol();
}
if (arrivedAtWaypoint())
{
running = false;
nav.speed = walkSpeed; //walk speed
//TODO: turn in place a couple times to look for the player
}
break;
case ZookeeperState.Stopped:
//game over?
break;
}
}
private void Stop()
{
stateText.text = "Stopped";
nav.Stop();
currentState = ZookeeperState.Stopped;
}
