Demo_敌军坦克生成，坦克移动（可以拓展发射子弹，敌军消失获取分数或者添加动画，声音功能）

using UnityEngine;
using System.Collections;

public class Tank : MonoBehaviour {

    //坦克面积结构体对象
    public TankArea tankArea;
    private float hor, ver;
    //坦克行走的速度，以及掉头速度
    public float moveSpeed = ;
    public float turnSpeed = ;

    void Start()
    {
        hor = Input.GetAxis("Horizontal");
        ver = Input.GetAxis("Vertical");

    }
    void Update()
    {
        //t坦克转身
        hor = Input.GetAxis("Horizontal");
        transform.eulerAngles += hor * Vector3.up * turnSpeed;
       //坦克前后行进
        ver = Input.GetAxis("Vertical");
        transform.position += transform.right * ver * Time.deltaTime * moveSpeed;

        //实时同步坦克面积结构体对象
        tankArea.TankInit (transform.position.x, transform.position.z);
    }
}

有了坦克之后再创造敌军坦克，随机生成并且向主坦克进攻。没有创造发射子弹以及敌人消失功能

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class EnemyCreater : MonoBehaviour {

    //敌方坦克预设体
    public GameObject enemyPrefab;
    //场面上的所有坦克
    private List<Tank> allTank;
    //主角坦克
    private Tank playerArea;
    //计时器
    private float timer;
    //生成坦克的时间间隔
    public float interval = ;

    void Awake()
    {
        allTank = new List<Tank> ();
    }

    void Start()
    {
        //找到主角TankArea对象
        playerArea = GameObject.FindWithTag ("Player").
            GetComponent<Tank> ();
        //将主角坦克添加到列表中
        allTank.Add (playerArea);
    }

    void Update()
    {
        //计时器计时
        timer += Time.deltaTime;
        //计时结束
        if (timer >= interval) {
            ///TODO:生成坦克
            EnemyInit();
            //计时器清零
            timer = ;
        }
    }

    /// <summary>
    /// 生成坦克
    /// </summary>
    void EnemyInit()
    {
        //随机位置
        float currentX;
        float currentZ;
        do {
            //开始随机
            currentX = Random.Range (-23.0f, 23.0f);
            currentZ = Random.Range (-23.0f, 23.0f);
        } while (!EnemyCheck(currentX,currentZ));
        //可用位置
        Vector3 canUsePos = new Vector3(currentX,,currentZ);
        //生成
        GameObject current = Instantiate (enemyPrefab,
            canUsePos,
            Quaternion.identity) as GameObject;
        //更新当前坦克列表
        allTank.Add (current.GetComponent<Tank> ());
    }

    /// <summary>
    /// 坦克位置检测
    /// </summary>
    /// <returns>True为可用，false为不可用.</returns>
    /// <param name="x">The x .</param>
    /// <param name="z">The z .</param>
    bool EnemyCheck(float x,float z)
    {
        //遍历所有坦克
        foreach (var currentT in allTank) {
            //检测当前坦克位置是否与该范围冲突
            bool canUse = !currentT.tankArea.PositionCheck (new Vector3 (x, , z));
            //如果冲突
            if (!canUse)
                //返回不可用
                return false;
        }
        //返回可用
        return true;
    }
}

需要引用的TankArea脚本

using UnityEngine;
using System.Collections;

public struct TankArea
{
    //坦克坐标
    Vector2 position;
    //左下坐标
    public Vector2 leftDown;
    //右上坐标
    public Vector2 rightUp;

    public void TankInit(float x,float z)
    {
        //设置坦克位置
        position = new Vector2 (x,z);
        //生成左上及右下点坐标
        leftDown = new Vector2 (x-,z-2.7f);
        rightUp = new Vector2 (x+,z+4.2f);
    }

    /// <summary>
    /// 位置检测
    /// </summary>
    /// <returns>如果该位置在范围内返回True，否则返回false</returns>
    /// <param name="pos">传入的坦克位置.</param>
    public bool PositionCheck(Vector3 pos)
    {
        if (pos.x > leftDown.x
           && pos.x < rightUp.x
           && pos.z > leftDown.y
           && pos.z < rightUp.y) {
            return true;
        }
        return false;
    }
}