Unity UGUI在鼠标位置不同时 图片浮动效果

 /// <summary>
 /// 在鼠标位置不同时 图片浮动效果
 /// </summary>
 public class TiltWindow : MonoBehaviour
 {
     public Vector2 range = new Vector2(5f, 3f);

     Transform mTrans;
     Quaternion mStart;
     Vector2 mRot = Vector2.zero;

     void Start ()
     {
         mTrans = transform;
         mStart = mTrans.localRotation;
     }

     void Update ()
     {
         Vector3 pos = Input.mousePosition;

         float halfWidth = Screen.width * 0.5f;
         float halfHeight = Screen.height * 0.5f;
         float x = Mathf.Clamp((pos.x - halfWidth) / halfWidth, -1f, 1f);
         float y = Mathf.Clamp((pos.y - halfHeight) / halfHeight, -1f, 1f);
         mRot = Vector2.Lerp(mRot, new Vector2(x, y), Time.deltaTime * 5f);

         mTrans.localRotation = mStart * Quaternion.Euler(-mRot.y * range.y, mRot.x * range.x, 0f);
     }
 }