82 lines
2.8 KiB
C#
82 lines
2.8 KiB
C#
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using UnityEngine;
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namespace BehaviorDesigner.Runtime.Tasks.Movement
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{
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[TaskDescription("Flee from the target specified using the Unity NavMesh.")]
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[TaskCategory("Movement")]
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[HelpURL("https://www.opsive.com/support/documentation/behavior-designer-movement-pack/")]
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[TaskIcon("Assets/Behavior Designer Movement/Editor/Icons/{SkinColor}FleeIcon.png")]
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public class Flee : NavMeshMovement
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{
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[Tooltip("The agent has fleed when the magnitude is greater than this value")]
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public SharedFloat fleedDistance = 20;
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[Tooltip("The distance to look ahead when fleeing")]
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public SharedFloat lookAheadDistance = 5;
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[Tooltip("The GameObject that the agent is fleeing from")]
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public SharedGameObject target;
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private bool hasMoved;
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public override void OnStart()
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{
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base.OnStart();
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hasMoved = false;
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SetDestination(Target());
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}
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// Flee from the target. Return success once the agent has fleed the target by moving far enough away from it
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// Return running if the agent is still fleeing
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public override TaskStatus OnUpdate()
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{
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if (Vector3.Magnitude(transform.position - target.Value.transform.position) > fleedDistance.Value) {
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return TaskStatus.Success;
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}
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if (HasArrived()) {
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if (!hasMoved) {
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return TaskStatus.Failure;
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}
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if (!SetDestination(Target())) {
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return TaskStatus.Failure;
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}
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hasMoved = false;
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} else {
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// If the agent is stuck the task shouldn't continue to return a status of running.
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var velocityMagnitude = Velocity().sqrMagnitude;
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if (hasMoved && velocityMagnitude <= 0f) {
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return TaskStatus.Failure;
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}
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hasMoved = velocityMagnitude > 0f;
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}
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return TaskStatus.Running;
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}
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// Flee in the opposite direction
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private Vector3 Target()
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{
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return transform.position + (transform.position - target.Value.transform.position).normalized * lookAheadDistance.Value;
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}
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// Return false if the position isn't valid on the NavMesh.
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protected override bool SetDestination(Vector3 destination)
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{
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if (!SamplePosition(destination)) {
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return false;
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}
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return base.SetDestination(destination);
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}
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// Reset the public variables
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public override void OnReset()
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{
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base.OnReset();
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fleedDistance = 20;
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lookAheadDistance = 5;
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target = null;
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}
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}
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}
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