Unity幸运转盘实战项目

using UnityEngine;using UnityEngine.UI; public class LuckyTurntable : MonoBehaviour{ public enum State {  None,  //待机状态  Start,  //加速阶段  Prepared, //等待数据阶段  End,  //减速阶段 }  public delegate void OnFinishCallback(); private event OnFinishCallback OnFinish;  /// <summary> /// 设置完成时的回调 /// </summary> /// <param name="onFinish"></param> public void SetOnFinishCallback(OnFinishCallback onFinish) {  OnFinish += onFinish; }  /// <summary> /// 最大速度 /// </summary> public int velocity = 3000;  public Transform node; public Button btnStart; public Button btnStop; public Button btnRandom; public InputField input;  private State _state; /// <summary> /// 转盘的状态 /// </summary> public State CurState {  get  {   return _state;  }  private set  {   _state = value;   switch (value)   {    //不同阶段限制各按钮的点击状态    case State.None:     btnStart.enabled = true;     btnStop.enabled = false;     btnRandom.enabled = false;     break;    case State.Start:     btnStart.enabled = false;     btnStop.enabled = true;     btnRandom.enabled = true;     break;    case State.Prepared:    case State.End:     btnStart.enabled = false;     btnStop.enabled = false;     btnRandom.enabled = false;     break;   }  } }  private float _endAngle = 0f; /// <summary> /// 最终停止的角度[0, 360] /// </summary> public float EndAngle {  get  {   return _endAngle;  }  set  {   _endAngle = Mathf.Abs(value);   print("End Angle: " + value);   _endAngle = _endAngle % 360; //将角度限定在[0, 360]这个区间   _endAngle = -_endAngle - 360 * 2; //多N圈并取反，圈数能使减速阶段变得更长，显示更自然，逼真  } }  /// <summary> /// 加速持续时间 /// </summary> private readonly float AcceleateTime = 1f;  /// <summary> /// 减速前的最短持续时间 /// </summary> private float _minTime = 3.0f; /// <summary> /// 角度缓存 /// </summary> private float _tmpAngle = 0f; /// <summary> /// 时间统计 /// </summary> private float _time; /// <summary> /// 速度变化因子 /// </summary> private float _factor;  private void Start() {  CurState = State.None;  btnStart.onClick.AddListener(OnStartClick);  btnStop.onClick.AddListener(OnStopClick);  btnRandom.onClick.AddListener(OnRandomClick); }  private void Update() {  if (CurState == State.None)   return;   _time += Time.deltaTime;  if (CurState == State.End)  {   //通过差值运算实现精准地旋转到指定角度（球型插值无法实现大于360°的计算）   float k = 2f; //如果嫌减速太慢，可以加个系数修正一下   _tmpAngle = Mathf.Lerp(_tmpAngle, EndAngle, Time.deltaTime * k);    //这里只存在一个方向的旋转，所以不存在欧拉角万向节的问题，所以使用欧拉角和四元数直接赋值都是可以的   node.rotation = Quaternion.Euler(0, 0, _tmpAngle);   //node.eulerAngles = new Vector3(0, 0, _tmpAngle);    if (1 >= Mathf.Abs(_tmpAngle - EndAngle))   {    CurState = State.None;    if (null != OnFinish)    {     OnFinish();     OnFinish = null;    }   }  }  else  {   //利用一个速度因子实现变加速的过程   _factor = _time / AcceleateTime;   _factor = _factor > 1 ? 1 : _factor;   node.Rotate(Vector3.back, _factor * velocity * Time.deltaTime, Space.Self);  }   //当收到数据之后并且旋转了一定时间后开始减速  if (CurState == State.Prepared && _time > _minTime)  {   CurState = State.End;   _tmpAngle = GetCurClockwiseAngle();  } }  /// <summary> /// 将当前指针的欧拉角转换成顺时针统计角度 /// </summary> /// <returns></returns> private float GetCurClockwiseAngle() {  //由于读取到的值是[0, 180] U [-180, 0]，左边由0至180递增，右边由180转变成-180，然后递增至0，所以需要转相应的转换  return (-1) * (360 - node.eulerAngles.z) % 360; }  private void OnStartClick() {  CurState = State.Start;  _time = 0; }  /// <summary> /// 读取输入框中的角度并停止 /// </summary> private void OnStopClick() {  try  {   EndAngle = float.Parse(input.text);  }  catch  {   EndAngle = 0f;  }  CurState = State.Prepared;  }  /// <summary> /// 随机一个角度并停止 /// </summary> private void OnRandomClick() {  EndAngle = UnityEngine.Random.Range(0f, 360f);  CurState = State.Prepared; }}