Unity游戏开发之射击小游戏的实现

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

public class PlayerMove : MonoBehaviour {

    /// <summary>
    /// 生命值
    /// </summary>
    public int HP;
    public Slider hpUI;

    /// <summary>
    /// 动画组建
    /// </summary>
    public Animator _animator;

    /// <summary>
    /// 击杀
    /// </summary>
    public static int jisha;
    public Text jishaUI;
    public Text jishaUIEnd;

    /// <summary>
    /// 是否跳跃
    /// </summary>
    public bool isJump;

    /// <summary>
    /// 游戏结束UI
    /// </summary>
    public GameObject ui;
    // Use this for initialization
    void Start ()
    {
        Time.timeScale = 1;
        jisha = 0;
        hpUI.maxValue = HP;
        hpUI.value = HP;
    }
	
	// Update is called once per frame
	void Update ()
    {
        if (Input.GetKeyDown (KeyCode.Escape))
        {
            UnityEngine.SceneManagement.SceneManager.LoadScene("Menu");
        }
        if (HP <= 0)
        {
            HP = 0;
        }
        jishaUI.text = "击杀：" + jisha;
        jishaUIEnd.text = "击杀：" + jisha;
        if (HP == 0)
        {
            ui.SetActive(true);
            Time.timeScale = 0;
        }
        hpUI.transform.position = Camera.main.WorldToScreenPoint(transform.position + new Vector3(0, 3, 0));
        hpUI.value = HP;
        if (Input.GetKey (KeyCode.D))
        {
            transform.localEulerAngles = new Vector3(0, 0, 0);
            transform.Translate(Vector3.right * Time.deltaTime * 7);
            _animator.SetBool("run", true);
        }
        else if (Input.GetKey(KeyCode.A))
        {
            transform.localEulerAngles = new Vector3(0, 180, 0);
            transform.Translate(Vector3.right * Time.deltaTime * 7);
            _animator.SetBool("run", true);
        }
        else
        {
            _animator.SetBool("run", false);
        }
        if (Input.GetKeyDown (KeyCode.Space) && !isJump)
        {
            GetComponent<Rigidbody2D>().velocity = new Vector2(0, 30);
        }
        if (isJump)
        {
            _animator.SetBool("Jump", true);
        }
        else
        {
            _animator.SetBool("Jump", false);
        }
        if (Input.GetKeyDown (KeyCode.J))
        {
            GameObject n = Instantiate(Resources.Load("a1"), transform.GetChild(0).position, transform.GetChild(0).rotation) as GameObject;
            n.name = "a1";
            Destroy(n, 2);
        }
        if (Input.GetKeyDown(KeyCode.K))
        {
            GameObject n = Instantiate(Resources.Load("a2"), transform.GetChild(0).position, transform.GetChild(0).rotation) as GameObject;
            n.name = "a2";
            Destroy(n, 2);
        }

    }
    private void OnTriggerStay2D(Collider2D collision)
    {
        if (collision.name == "0")
        {
            isJump = false;
        }
    }
    private void OnTriggerExit2D(Collider2D collision)
    {
        if (collision.name == "0")
        {
            isJump = true;
        }
    }
    public void ReturnMenu()
    {
        UnityEngine.SceneManagement.SceneManager.LoadScene("Menu");
    }
}

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

public class Monster : MonoBehaviour {
    /// <summary>
    /// 生命
    /// </summary>
    public int HP;

    /// <summary>
    /// 速度
    /// </summary>
    public float speed;

    /// <summary>
    /// 攻击力
    /// </summary>
    public int att;


    public Slider hpUI;
	// Use this for initialization
	void Start ()
    {
        speed = Random.RandomRange(speed - 2, speed + 2);
        Destroy(gameObject, 10);

        GameObject n = Instantiate(Resources.Load("HP")) as GameObject;
        n.transform.SetParent(GameObject.Find("HPShow").transform);
        n.transform.localScale = Vector3.one;
        hpUI = n.GetComponent<Slider>();
        hpUI.maxValue = HP;
        hpUI.value = HP;
	}
	
	// Update is called once per frame
	void Update ()
    {
        if (HP <= 0)
        {
            HP = 0;
            PlayerMove.jisha++;
            Destroy(gameObject);
        }
        hpUI.transform.position = Camera.main.WorldToScreenPoint(transform.position + new Vector3 (0, 6, 0));
        hpUI.value = HP;
        transform.Translate(Vector3.right * Time.deltaTime * speed);
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        //撞到玩家生命值
        if (collision.name == "Player")
        {
            collision.GetComponent<PlayerMove>().HP -= Random.RandomRange(att - 2, att + 2);
            Destroy(gameObject);
        }
        //红色子弹伤害低，能够连续穿透射击多个目标
        if (collision.name == "a1")
        {
            HP -= Random.RandomRange(8, 15);
        }
        //红色子弹伤害高，只能击中一个目标
        if (collision.name == "a2")
        {
            HP -= Random.RandomRange(20, 40);
            Destroy(collision.gameObject);
        }
    }

    private void OnDestroy()
    {
        Destroy(hpUI.gameObject);
    }
}