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)
    {
        string opponentTag = unit.OpponentTag;
        if (string.IsNullOrEmpty(opponentTag))
        {
            return null;
        }

        GameObject nearbyOpponent = null;
        float nearestSqrDistance = splitShotRadius * splitShotRadius;
        GameObject[] opponents = GameObject.FindGameObjectsWithTag(opponentTag);
        foreach (GameObject opponent in opponents)
        {
            if (opponent == mainTarget || opponent == unit.gameObject || opponent.transform.root == unit.transform.root)
            {
                continue;
            }

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

        return nearbyOpponent;
    }
}