daluandou/Assets/Script/ArcherHunterSkill.cs

using UnityEngine;

public class ArcherHunterSkill : UnitSkill
{
    [Min(0f)]
    public float splitShotRadius = 3f;

    public override void ReleaseSkill()
    {
        GameObject mainTarget = unit.Target;
        if (mainTarget == null)
        {
            return;
        }

        GameObject nearbyOpponent = FindNearbyOpponent(mainTarget);
        unit.FireSkillProjectile(nearbyOpponent != null ? nearbyOpponent : mainTarget);
    }

    private GameObject FindNearbyOpponent(GameObject mainTarget)
    {
        UnitTeam myTeam = unit.GetComponent<UnitTeam>();
        if (myTeam == null)
        {
            return null;
        }

        GameObject nearbyOpponent = null;
        float nearestSqrDistance = splitShotRadius * splitShotRadius;
        foreach (UnitTeam opponentTeam in GameObject.FindObjectsOfType<UnitTeam>())
        {
            GameObject opponent = opponentTeam.gameObject;
            if (opponent == null
                || opponent == mainTarget
                || opponent == unit.gameObject
                || opponent.transform.root == unit.transform.root
                || !myTeam.IsEnemy(opponent))
            {
                continue;
            }

            float sqrDistance = (opponent.transform.position - mainTarget.transform.position).sqrMagnitude;
            if (sqrDistance <= nearestSqrDistance)
            {
                nearestSqrDistance = sqrDistance;
                nearbyOpponent = opponent;
            }
        }

        return nearbyOpponent;
    }
}