Gen_Hack-and-Slash-Roguelite-zzdxxz/Client/Assets/Scripts/Entity/Bullet.cs

using System;
using Base;
using Data;
using Prefab;
using UnityEngine;

namespace Entity
{
    public class Bullet : Entity
    {
        public Entity bulletSource;
        public float lifeTime = 10;
        
        public override void SetTarget(Vector3 pos)
        {
            base.SetTarget(pos);
            RotateTransformToDirection(transform, direction);
        }

        protected override void AutoBehave()
        {
            TryMove();
            lifeTime-=Time.deltaTime;
            if (lifeTime <= 0)
            {
                Kill();
            }
        }

        private void OnTriggerEnter2D(Collider2D other)
        {
            var entity = other.GetComponent<Entity>();
            if (!entity || entity == bulletSource) return;
            if (Managers.AffiliationManager.Instance.GetRelation(bulletSource.affiliation, entity.affiliation) != Relation.Friendly)
            {
                entity.OnHit(this);
            }
            else if (Setting.Instance.CurrentSettings.friendlyFire)
            {
                entity.OnHit(this);
            }
            else
            {
                return; // 如果是友好关系且不允许友军伤害，则不处理
            }
            attributes.health -= 1;
        }

        // 旋转对象到指定方向
        public static void RotateTransformToDirection(Transform transform, Vector3 targetDirection)
        {
            // 确保目标方向不是零向量
            if (targetDirection == Vector3.zero)
                return;

            // 计算当前向上方向与目标方向之间的角度
            float angle = Mathf.Atan2(targetDirection.y, targetDirection.x) * Mathf.Rad2Deg;

            // 调整角度，因为默认贴图向上是0度，而Atan2计算的是相对于x轴的角度
            angle -= 90f;

            // 应用旋转
            transform.rotation = Quaternion.Euler(0f, 0f, angle);
        }
    }
}