unity3d开发 打飞机小游戏（四）（敌机/奖励物品生成）

紧接着上一期哈，我们讲一下怎么随机生成敌机和奖励物品

首先在资源里面找到你的敌机和奖励物品，拖到场景，选好layer，应该都很熟练了吧，然后给敌机和奖励物品添加一下脚本

敌机的脚本，比较简单

public class Emeny : MonoBehaviour {    public int hp = 1;    public float Speed = 2;    public int score;// Update is called once per framevoid Update () {        transform.Translate(Vector3.down * Speed * Time.deltaTime);        if(transform.position.y<=-5.3f){            Destroy(this.gameObject);        }}}

奖励物品脚本，这里分了两种奖励物品，所以设定了一个type

public class Award : MonoBehaviour {    public int type = 0; // 0 gun 1 explode    public float Speed = 1.5f;// Update is called once per framevoid Update () {        transform.Translate(Vector3.down * Speed * Time.deltaTime);        if (transform.position.y <= -4.5f)            Destroy(this.gameObject);}}

设置完之后呢给物品添加脚本，然后就可以拖进prefabs里面了

这样我们到目前为止就拥有了这么多的模型了

这样呢你可能会发现，敌机和奖励物品不能自动无限出来啊？我们呢就可以给它一个触发器来控制它

新建一个空物品，把它拖到场景外一点，这样呢生成出来的敌机不会太突兀是吧

添加脚本，脚本看了上一期的应该非常简单，这里唯一不同的是我们添加了一个在x轴上的随机生成，至于随机的范围怎么确定呢，非常简单，你拖一个物品到场景里然后左右拖动就可以知道范围了~

public class Spawn : MonoBehaviour {    public GameObject enemy0Prefab;    public GameObject enemy1Prefab;    public GameObject enemy2Prefab;    public GameObject award0Prefab;    public GameObject award1Prefab;    //生成敌机/奖励的速率    public float enemy0Rate = 0.5f;    public float enemy1Rate = 2f;    public float enemy2Rate = 5f;    public float award0Rate = 6f;    public float award1Rate = 10f;    // Use this for initialization    void Start () {        InvokeRepeating("createEnemy0", 1, enemy0Rate);        InvokeRepeating("createEnemy1", 2, enemy1Rate);        InvokeRepeating("createEnemy2", 3, enemy2Rate);        InvokeRepeating("createAward0", 6, award0Rate);        InvokeRepeating("createAward1", 10, award1Rate);    }    public void createEnemy0(){        float x = Random.Range(-2.16f,2.16f);        GameObject.Instantiate(enemy0Prefab, new Vector3(x,transform.position.y,0), Quaternion.identity);    }    public void createEnemy1()    {        float x = Random.Range(-2.14f, 2.14f);        GameObject.Instantiate(enemy1Prefab, new Vector3(x, transform.position.y, 0), Quaternion.identity);    }    public void createEnemy2()    {        float x = Random.Range(-2.0f, 2.0f);        GameObject.Instantiate(enemy2Prefab, new Vector3(x, transform.position.y, 0), Quaternion.identity);    }    public void createAward0()    {        float x = Random.Range(-2.0f, 2.0f);        GameObject.Instantiate(award0Prefab, new Vector3(x, transform.position.y, 0), Quaternion.identity);    }    public void createAward1()    {        float x = Random.Range(-2.0f, 2.0f);        GameObject.Instantiate(award1Prefab, new Vector3(x, transform.position.y, 0), Quaternion.identity);    }}

这样添加好脚本，并且把敌机和奖励物品拖进脚本之后呢，就可以运行啦

是不是很好玩呢，感觉动手试试吧