GUI管理 鼠标左键点击界面方向键，摄像机移动移动

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
/*
 * GUI管理
 * 鼠标左键点击界面方向键，摄像机移动移动
 */
public class GUIManager : MonoBehaviour {

    //前后左右移动
    private float moveSpeed = 200;
    public GameObject startPosition;
    private bool isTop = false;
    private bool isDown = false;
    private bool isLeft = false;
    private bool isRight = false;
    
    public void toTop()
    {
        isTop = true;
    }
    public void toDown()
    {
        isDown = true;
    }
    public void toLeft()
    {
        isLeft = true;
    }
    public void toRight()
    {
        isRight = true;
    }
    private void FixedUpdate()
    {
            if (isTop)
            {
                //Debug.Log("to top");
                startPosition.transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
            }
            if (isDown)
            {
                //Debug.Log("to down");
                startPosition.transform.Translate((-Vector3.forward) * moveSpeed * Time.deltaTime);
            }
            if (isLeft)
            {
                //Debug.Log("to left");
                startPosition.transform.Translate((-Vector3.right) * moveSpeed * Time.deltaTime);
            }
            if (isRight)
            {
                //Debug.Log("to right");
                startPosition.transform.Translate(Vector3.right * moveSpeed * Time.deltaTime);
            }
            isTop = false;
            isDown = false;
            isLeft = false;
            isRight = false;
    }
}