using ActionGameFramework.Health;
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using ActionGameFramework.Helpers;
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using Core.Health;
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using UnityEngine;
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namespace ActionGameFramework.Projectiles
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{
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/// <summary>
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/// Basic override of LinearProjectile that allows them to adjust their path in-flight to intercept a designated target.
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/// </summary>
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public class HomingLinearProjectile : LinearProjectile
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{
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public int leadingPrecision = 2;
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public bool leadTarget;
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protected Targetable m_HomingTarget;
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Vector3 m_TargetVelocity;
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/// <summary>
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/// Sets the target transform that will be homed in on once fired.
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/// </summary>
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/// <param name="target">Transform of the target to home in on.</param>
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public void SetHomingTarget(Targetable target)
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{
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m_HomingTarget = target;
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}
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protected virtual void FixedUpdate()
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{
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if (m_HomingTarget == null)
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{
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return;
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}
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m_TargetVelocity = m_HomingTarget.velocity;
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}
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protected override void Update()
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{
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if (!m_Fired)
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{
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return;
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}
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if (m_HomingTarget == null)
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{
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m_Rigidbody.rotation = Quaternion.LookRotation(m_Rigidbody.velocity);
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return;
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}
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Quaternion aimDirection = Quaternion.LookRotation(GetHeading());
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m_Rigidbody.rotation = aimDirection;
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m_Rigidbody.velocity = transform.forward * m_Rigidbody.velocity.magnitude;
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base.Update();
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}
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protected Vector3 GetHeading()
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{
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if (m_HomingTarget == null)
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{
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return Vector3.zero;
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}
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Vector3 heading;
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if (leadTarget)
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{
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heading = Ballistics.CalculateLinearLeadingTargetPoint(transform.position, m_HomingTarget.position,
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m_TargetVelocity, m_Rigidbody.velocity.magnitude,
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acceleration,
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leadingPrecision) - transform.position;
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}
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else
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{
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heading = m_HomingTarget.position - transform.position;
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}
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return heading.normalized;
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}
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protected override void Fire(Vector3 firingVector)
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{
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if (m_HomingTarget == null)
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{
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Debug.LogError("Homing target has not been specified. Aborting fire.");
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return;
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}
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m_HomingTarget.removed += OnTargetDied;
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base.Fire(firingVector);
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}
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void OnTargetDied(DamageableBehaviour targetable)
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{
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targetable.removed -= OnTargetDied;
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m_HomingTarget = null;
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}
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}
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}
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