unity3d 塔防代码

这是一个简单的Unity3D塔防游戏的代码示例：

using UnityEngine;
using System.Collections;

public class Tower : MonoBehaviour {

    public GameObject bulletPrefab;
    public float fireRate = 1f;
    public float range = 10f;

    private Transform target;
    private float fireCountdown = 0f;

    void Start () {
        InvokeRepeating ("UpdateTarget", 0f, 0.5f);
    }

    void UpdateTarget () {
        GameObject[] enemies = GameObject.FindGameObjectsWithTag("Enemy");
        float shortestDistance = Mathf.Infinity;
        GameObject nearestEnemy = null;
        foreach (GameObject enemy in enemies) {
            float distanceToEnemy = Vector3.Distance(transform.position, enemy.transform.position);
            if (distanceToEnemy < shortestDistance) {
                shortestDistance = distanceToEnemy;
                nearestEnemy = enemy;
            }
        }

        if (nearestEnemy != null && shortestDistance <= range) {
            target = nearestEnemy.transform;
        } else {
            target = null;
        }
    }

    void Update () {
        if (target == null) {
            return;
        }

        if (fireCountdown <= 0f) {
            Shoot ();
            fireCountdown = 1f / fireRate;
        }

        fireCountdown -= Time.deltaTime;
    }

    void Shoot () {
        GameObject bulletGO = (GameObject)Instantiate (bulletPrefab, transform.position, transform.rotation);
        Bullet bullet = bulletGO.GetComponent<Bullet> ();

        if (bullet != null) {
            bullet.Seek (target);
        }
    }

    void OnDrawGizmosSelected () {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere (transform.position, range);
    }
}

这段代码实现了一个简单的塔防游戏，其中包含了塔的基本属性和行为，例如攻击速率、攻击范围、自动锁定敌人等。在每一次更新中，塔会自动搜索并锁定最近的敌人，如果敌人在攻击范围内，则发射子弹攻击敌人。在场景中，需要添加敌人和子弹的预制体，并将其分别与塔的代码关联。