unity 判断物体是否到达屏幕边界

来源：互联网发布：safari 64位 windows 编辑：程序博客网时间：2024/05/17 22:30

 public float leftBorder;    public float rightBorder;    public float topBorder;    public float downBorder;    private float width;    private float height;    private int count;    bool fistTan = false;    void Start()    {        //世界坐标的右上角  因为视口坐标右上角是1,1,点        Vector3 cornerPos = Camera.main.ViewportToWorldPoint(new Vector3(1f, 1f,         Mathf.Abs(-Camera.main.transform.position.z)));//世界坐标左边界        leftBorder = Camera.main.transform.position.x - (cornerPos.x - Camera.main.transform.position.x);        //世界坐标右边界

rightBorder = cornerPos.x;

//世界坐标上边界        topBorder = cornerPos.y;

//世界坐标下边界        downBorder = Camera.main.transform.position.y - (cornerPos.y - Camera.main.transform.position.y);        width = rightBorder - leftBorder;        height = topBorder - downBorder;    }    void Update()    {

        transform.Translate(new Vector3(0, Time.deltaTime * speed, 0f));        //上 如果物体的Y轴和屏幕Y轴相等那么就是证明到达边界        if (transform.localPosition.y >= topBorder)        {            transform.position = new Vector3(transform.localPosition.x, topBorder, 0);

//计算物体到达边界之后又按原来角度弹回去            if (transform.eulerAngles.z > 0)            {                transform.eulerAngles = new Vector3(0, 0, 180 - transform.eulerAngles.z);                count++;            }        }        //下        if (transform.localPosition.y <= downBorder)        {            transform.position = new Vector3(transform.localPosition.x, downBorder, 0);            if (transform.eulerAngles.z > 0)            {                transform.eulerAngles = new Vector3(0, 0, 180 - transform.eulerAngles.z);                count++;            }        }        //左        if (transform.localPosition.x <= leftBorder)        {            transform.position = new Vector3(leftBorder, transform.localPosition.y, 0);            if (transform.eulerAngles.z > 0)            {                transform.eulerAngles = new Vector3(0, 0, -transform.eulerAngles.z);                count++;            }        }        //右        if (transform.localPosition.x >= rightBorder)        {            transform.position = new Vector3(rightBorder, transform.localPosition.y, 0);            if (transform.eulerAngles.z > 0)            {                transform.eulerAngles = new Vector3(0, 0, -transform.eulerAngles.z);                count++;            }        }

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