public void RotateAround(Vector3 point, Vector3 axis, float angle);
    //通過給定一個世界坐標、軸向以及一個角度，使物體以該角度旋轉(zhuǎn)繞世界坐標點的軸向的變換
  
  public T GetComponent<T>();
    //獲取對象的組件
 
  public bool enabled { get; set; }
    //設(shè)置激活狀態(tài) 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class RotateControl : MonoBehaviour {
 
  public GameObject RedLight;//紅燈
  public GameObject GreenLight;//綠燈
  public GameObject Center;//旋轉(zhuǎn)中心，若為自身則指定自身
 
  private bool isOn = false;//正在開啟
  private bool isOff = false;//正在關(guān)閉
  [Range(0,180)]
  public float onLine = 80;//旋鈕最大角度
  [Range(0,180)]
  private float offLine = 0;//旋鈕最小角度
  [Range(0,3)]
  public float speed = 1;//旋轉(zhuǎn)速度
  [Range(0, 20)]
  public float LightingRange = 10;//亮燈角度與旋鈕最大角度的角度差
 
  // Use this for initialization
  void Start () {
    isOn = false;
    isOff = false;
    offLine = Center.transform.rotation.z;//設(shè)定起始位置即為最小角度
    RedLight.GetComponent<Renderer>().enabled = false;//關(guān)閉紅燈渲染
    GreenLight.GetComponent<Renderer>().enabled = false;//關(guān)閉綠燈渲染
  }
 
 // Update is called once per frame
 void Update () {
    if (Input.GetKeyDown(KeyCode.R))//關(guān)閉
    {
      isOn = false;
      isOff = true;
    }
    if (Input.GetKeyDown(KeyCode.G))//開啟
    {
      isOn = true;
      isOff = false;
    }
 
    if (isOn == true)
    {
      if (this.transform.eulerAngles.z < onLine)//旋鈕旋轉(zhuǎn)至最大角度
      {
        this.transform.RotateAround(this.transform.position, this.transform.forward, speed);
      }
      else
      {
        isOn = false;
      }
    }
    if (isOff == true)
    {
      if (this.transform.eulerAngles.z > offLine + 1)//旋轉(zhuǎn)至最小角度+1°的角度，當物體旋轉(zhuǎn)到0時繼續(xù)旋轉(zhuǎn)則變?yōu)?60度
      {
        this.transform.RotateAround(this.transform.position, this.transform.forward, -speed);
      }
      else
      {
        isOff = false;
      }
    }
 
    //檢測旋轉(zhuǎn)角度控制燈光
    if (this.transform.eulerAngles.z >= onLine - LightingRange)//當旋鈕旋轉(zhuǎn)角度大于閾值則渲染綠燈，關(guān)閉紅燈
    {
      RedLight.GetComponent<Renderer>().enabled = false;
      GreenLight.GetComponent<Renderer>().enabled = true;
    }
    else
    {
      RedLight.GetComponent<Renderer>().enabled = true;
      GreenLight.GetComponent<Renderer>().enabled = false;
    }
  }
}