c# 2d重力感应 （陀螺仪）

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

public class news : MonoBehaviour
{
    public RectTransform go;
    private float cross_x, cross_y;
    private Vector2 vec;
    public Text tt;
    void Start()
    {
        print(go.sizeDelta.x);
        cross_x = Screen.width - go.sizeDelta.x/2;
        cross_y = Screen.height - go.sizeDelta.y/2;
        vec = go.position;
    }

    void Update()
    {
        vec.x += Input.acceleration.x*10;
        vec.y += Input.acceleration.y * 10;
        if (vec.x < go.sizeDelta.x/2)
        {
            vec.x = go.sizeDelta.x/2;
        }
        else if (vec.x > cross_x)
        {
            vec.x = cross_x;
        }

        if (vec.y < go.sizeDelta.y/2)
        {
            vec.y = go.sizeDelta.y/2;
        }
        else if (vec.y > cross_y)
        {
            vec.y = cross_y;
        }
        tt.text = vec.x + "      " + vec.y;
        go.position = vec;
    }
}