Touch简单使用

<pre name="code" class="csharp">        Vector2 oldFingerPosition1;    Vector2 oldFingerPosition2;void Start()     {   //允许多点触屏 Input.multiTouchEnabled=true;  }void Update () {        //判断当前触摸屏幕的手指个数 该函数可自定义 然后在Update()里面调用 也可以直接在Update()里面写        if (Input.touchCount <= 0) { return; }        else if (Input.touchCount > 1)//当有多个手指触屏         {            if (Input.GetTouch(0).phase == TouchPhase.Began || Input.GetTouch(1).phase == TouchPhase.Began)            {                oldFingerPosition1 = Input.GetTouch(0).position;                oldFingerPosition2 = Input.GetTouch(1).position;            }            if (Input.GetTouch(0).phase == TouchPhase.Moved || Input.GetTouch(1).phase == TouchPhase.Moved)            {                Vector2 newFingerPosition1 = Input.GetTouch(0).position;                Vector2 newFingerPosition2 = Input.GetTouch(1).position;                float lendth1 = lenth2Point(oldFingerPosition1, oldFingerPosition2);                float lendth2 = lenth2Point(newFingerPosition1, newFingerPosition2);                float speedValue = (lendth2 - lendth1) / 400;                Camera.main.transform.Translate(0, 0, speedValue * Time.deltaTime);//移动相机 在z轴上变化             }        }    }    //计算两点之间的距离    public float lenth2Point(Vector2 oP1, Vector2 oP2)    {        return Mathf.Sqrt((oP1.x - oP2.x) * (oP1.x - oP2.x) + (oP1.y - oP2.y) * (oP1.y - oP2.y));    }