unity实现简单抽奖系统

这段时间工作比较空闲，想做个抽奖系统，发现网上的抽奖系统看不懂，然后自己做了一个可以随意定义奖品概率，不管什么时候停下来指针最终都会转到指定的奖品哪。

废话不多说，动手一步一步来。

这个抽奖系统就使用了两张图片，一个指针，一个圆形的图片。

然后做一个预制体，图片就是圆形图片，image type选择filled,fill amount控制这个图片的面积大小，同时也是该图片的概率，Text组件是该奖品的名称。

再接下来就做一下界面布局的工作

Bg就是那个灰色的图片，Rotate是个空物体，用来挂在脚本的（DialRotate.cs和Slot.cs），cloneParent也是个空物体，作为预制体的父物体，要注意的是cloneParent中心那个蓝色的圆圈要和Rotate的蓝色的圈的位置一致，界面布局工作完成。

接下来到代码了，Slot.cs脚本，一开始会实例化奖品，K键和L键可以随意修改奖品名称，概率（这里概率做了限制，需要使用的自己修改一下代码即可），空格键会随机抛出物品，并且开始旋转，鼠标右键是停止转动（想什么时候停下来都行，最后都会得到所抛出的物体）DialRotate.cs脚本用于处理旋转的。这两个脚本涉及到一些数学计算，慢慢理解即可。

以下是这个工程的脚本，需要的话直接复制黏贴即可使用

Slot.cs 

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

public class Slot : MonoBehaviour {

  private DialRotate dialRotate;   
  /// <summary>
  /// 奖品数据
  /// </summary>
  private class GrifData
  { 
   /// <summary>
  /// 奖品的名称
  /// </summary>
    public string mText;
    /// <summary>
    /// 图片的Amount值
    /// </summary>
    public float point;
    /// <summary>
    /// 奖品停留在指针时父物体要旋转的角度
    /// </summary>
    public float angle;
    /// <summary>
    /// 该奖品对应UI面板上的名称
    /// </summary>
    public string mtran;
    /// <summary>
    /// 该奖品的ID
    /// </summary>
    public int gID;
  }
   /// <summary>
   /// 奖品的描述信息
   /// </summary>
  private class GrifInfo
  {
    public Text mText;
    public string msg;
  }

  private List<GrifInfo> mListSD = new List<GrifInfo>();
  /// <summary>
  /// 奖品的id和概率对应
  /// </summary>
  private Dictionary<int, float> mPoints = new Dictionary<int, float>();
  /// <summary>
  /// 用于储存奖品信息（顺序排列）（奖品的id，名称，所占的百分比）
  /// </summary>
  private List<GrifData> grigtData = new List<GrifData>();
  /// <summary>
  /// 这个也是用于储存奖品信息，不过是乱序排列（奖品的id，名称，所占的百分比）
  /// </summary>
  private List<GrifData> randomData = new List<GrifData>();
  /// <summary>
  /// 20种奖品的Transform，（最多20个不用的奖励）
  /// </summary>
  private List<Transform> mTransLs = new List<Transform>();

  private List<Color> mColors = new List<Color>();

  private Transform cloneParent;
  private GameObject clonePrefab;
  /// <summary>
  /// 抽奖停止时父物体转动的角度
  /// </summary>
  public float tarAngle;
  /// <summary>
  /// 该奖品对应UI面板上的名称
  /// </summary>
  public string tarName;
  public int giftID;
  /// <summary>
  /// 用于检验概率有没有为100%
  /// </summary>
  private List<float> checkProbability = new List<float>();

  private void Start()
  {
    cloneParent = transform.Find("cloneParent");
    clonePrefab = Resources.Load<GameObject>("Clone");
    dialRotate = GetComponent<DialRotate>();
    Init();
  }
  void Update()
  {
    #region 测试修改奖品，概率
    if (Input.GetKeyDown(KeyCode.K))
    {
      ClearData();
      if (checkProbability.Count > 0)
      {
        checkProbability.Clear();
      }
      if (mPoints.Count > 0)
      {
        mPoints.Clear();
      }
      AddData("111", 0.3f,1);
      AddData("222", 0.1f,2);
      AddData("333", 0.2f,4);
      AddData("444", 0.05f,5);
      AddData("555", 0.15f,6);
      AddData("666", 0.2f,7);
      SetPriceRange();
    }
    if (Input.GetKeyDown(KeyCode.J))
    {
      ClearData();
      if (checkProbability.Count > 0)
      {
        checkProbability.Clear();
      }
      if (mPoints.Count > 0)
      {
        mPoints.Clear();
      }
      AddData("薯条", 0.3f, 1);
      AddData("汉堡", 0.1f, 2);
      AddData("炸鸡", 0.2f, 4);
      AddData("啤酒", 0.05f, 5);
      AddData("可乐", 0.15f, 6);
      AddData("烤肉", 0.2f, 7);
      SetPriceRange();
    }
    #endregion
    if (Input.GetKeyDown(KeyCode.Space))
    {
      StartRotate();
    }
  }
  private void Init()
  {
    for (int i = 0; i < 20; i++)
    {
      GameObject go = Instantiate(clonePrefab) as GameObject;
      go.transform.SetParent(cloneParent);
      go.transform.localScale = Vector3.one;
      go.transform.localPosition = Vector3.zero;
      go.name = "" + i;
      mTransLs.Add(go.transform);
    }
    foreach (Transform tr in mTransLs)
    {
      tr.GetComponent<Image>().color = GetColors();
      tr.gameObject.SetActive(false);
    }
    AddData("薯条", 0.3f, 1);
    AddData("汉堡", 0.1f, 2);
    AddData("炸鸡", 0.2f, 4);
    AddData("啤酒", 0.05f, 5);
    AddData("可乐", 0.15f, 6);
    AddData("烤肉", 0.2f, 7);
    SetPriceRange();
  }
   /// <summary>
   /// 获得随机颜色
   /// </summary>
   /// <returns></returns>
  private Color GetColors()
  {
    return new Color(Random.Range(0, 1.0f), Random.Range(0, 1.0f), Random.Range(0, 1.0f));
  }

  /// <summary>
  /// 清除奖品的相关数据和设置新的颜色
  /// </summary>
  public void ClearData()
  {
    grigtData.Clear();
    foreach (Transform tr in mTransLs)
    {
      tr.GetComponent<Image>().color = GetColors();
      tr.gameObject.SetActive(false);
    }
  }
  /// <summary>
  /// 设置奖励信息
  /// </summary>
  /// <param name="text">名称</param>
  /// <param name="point">所占的百分比</param>
  /// <param name="gID">该奖品的ID</param>
  public void AddData(string text, float point, int gID)
  {
    if (point < 0.05f)
    {
      Debug.LogError("奖品的概率不能小于5%");
    }
    if (point >1.0f)
    {
      Debug.LogError("奖品的概率不能大于100%");
    }
    GrifData data = new GrifData();
    data.mText = text;
    data.point = point;
    data.gID = gID;
    grigtData.Add(data);
    if (mPoints.ContainsKey(gID))
    {
      // mPoints[gID] = point;
      Debug.LogError("物品的ID不能一致，无法添加到字典");
      return;
    }
    mPoints.Add(gID, point);
    checkProbability.Add(point);
  }
  /// <summary>
  /// 设置奖品转盘的面积的大小显示
  /// </summary>
  public void SetPriceRange()
  {
    float total = 0;
    for (int i = 0; i < checkProbability.Count; i++)
    {
      total += checkProbability[i];
    }
    if (total.ToString() !="1")
    {
      Debug.LogError("奖品的概率总和不等于百分百，请从新设定概率");
      return;
    }
    transform.localEulerAngles = Vector3.zero;              
    // List<SData> temDate = mData.OrderBy(mData => mData.point).ToList(); //升序排序
    //乱序排列
    randomData.Clear();              
    int count = grigtData.Count;  //所设置的奖品的个数
    for (int i = 0; i < count; i++)
    {
      int ra = Random.Range(0, grigtData.Count);
      randomData.Add(grigtData[ra]);
      grigtData.RemoveAt(ra);
    }
    if (mListSD.Count > 0)
    {
      mListSD.Clear(); //先清空
    }  
    float nowAmount = 0;
    Text text;
    for (int i = 0; i < count; i++)   //把设置了奖品的显示出来
    {
      Transform tr = mTransLs[i];
      tr.gameObject.SetActive(true);
      // Debug.Log(ramData[i].mText + "/n");
      //因为绘制奖励区域是从转盘的下面6点顺时针方向开始绘制，而指针是在上面9点，转盘是顺时针转动，加多180度，
      
      //ramData[i].point/2 使得转盘停下来时使得奖品刚好处于指针的中间                       
      float target = 180 + (nowAmount + randomData[i].point/2) * 360;  
      if (target > 360)
        target -= 360;
      text = tr.Find("Text").GetComponent<Text>();
      text.text = randomData[i].mText;
      GrifInfo grifInfo = new GrifInfo(); //暂时预留，发奖品不是单倍的时候有用
      grifInfo.mText = text;       //暂时预留，发奖品不是单倍的时候有用
      grifInfo.msg = randomData[i].mText;  //暂时预留，发奖品不是单倍的时候有用
      mListSD.Add(grifInfo);       //暂时预留，发奖品不是单倍的时候有用
      tr.GetComponent<Image>().fillAmount = randomData[i].point; 
      //这个是旋转所设置的奖品的角度
      tr.localEulerAngles = new Vector3(0, 0, -nowAmount * 360); //0.1Amount = 36度
                                      
      nowAmount += randomData[i].point;
      // Debug.Log(" i = " + i + "target = " + target);           
      randomData[i].angle = target;
      randomData[i].mtran = tr.name;
      // Debug.Log("target = " + target);
    }
  }
  /// <summary>
  /// 设置奖品的倍数
  /// </summary>
  /// <param name="multiple"></param>
  public void SetMultiple(int multiple)
  {
    foreach (GrifInfo ss in mListSD)
    {
      if (multiple == 1)
      {
        ss.mText.text = ss.msg;
      }  
      else
      {
        ss.mText.text = ss.msg + " X" + multiple;
      }                        
    }
  }
  /// <summary>
  /// 获得结果（得到概率）
  /// </summary>
  public void GetResult()
  {
    float probability = Random.Range(0.0f, 1.0f);
    float nowSub = 0;
    string testStr = "";             
    for (int i = 0; i < randomData.Count; i++)
    {
      nowSub += mPoints[randomData[i].gID];   //该奖品对应的概率(Amount值)
      if (probability < nowSub)
      {
        tarAngle = randomData[i].angle; //该奖品停止转动时需要转动的角度
        tarName = randomData[i].mtran;  //该奖品的名称
        giftID = randomData[i].gID;   //ID
        testStr ="奖品名称 = " + randomData[i].mText + " 奖品概率 = " + (mPoints[randomData[i].gID] * 100 + " UI上的名称 = " + tarName + " 奖品的ID = " + giftID);
        Debug.Log(testStr);
        break;
      } 
    }      
  }
  private void StartRotate()
  {
    GetResult();
    dialRotate.StartQuan(tarAngle, tarName);
    Debug.Log("StartRotate() : tarAngle = " + tarAngle);
  }
}

----------------------分割线----------------------

DialRotate.cs 

using UnityEngine;

public enum RollType
{
  None,
  Start, //开始转动
  ConstantSpeed, //匀速运动
  Stop,  //停止运动
}

public class DialRotate : MonoBehaviour {

  private RollType nowType = RollType.None;   
  private float tarAngle; //该奖品停下来时父物体Z轴需要转动的角度
  /// <summary>
  /// 当前Z轴的值
  /// </summary>
  private float nowAngle = 0;
  private string grifName;
  private float time;//计时器
  private float speed = 0;
  public float angleSpeed = 2;  
  
  void Update () {
    if (Input.GetMouseButtonDown(1))
    {
      if (nowType == RollType.ConstantSpeed)
      {   
        nowType = RollType.Stop;
       // Debug.Log("tarAngle = " + tarAngle + " nowAngle = " + nowAngle);
        tarAngle += nowAngle + 360;    
        time = 0;
      }
    }

    if (nowType == RollType.Start)
    {  
      time += Time.deltaTime; 
      float x = angleSpeed * time * time; //这些数值影响转盘的转动速度，自己看着喜欢调节即可
      nowAngle -= x;
      speed += 4 * time;

      transform.localEulerAngles = new Vector3(0, 0, nowAngle);
      if (speed > 400)
      {
        nowType = RollType.ConstantSpeed;   
      }  
    }
    else if (nowType == RollType.ConstantSpeed)
    {
      nowAngle -= speed * Time.deltaTime;  //匀速旋转
      transform.localEulerAngles = new Vector3(0, 0, nowAngle);  
    } 
    else if (nowType == RollType.Stop)
    {
      //速度慢慢变小,转盘慢慢的慢下来
      speed = Mathf.Lerp(speed, Mathf.Min(speed, tarAngle * 0.25f), Time.deltaTime);
     // Debug.Log("speed = " + speed);
      if (speed < 5)
      {
        speed = 5;
      } 
      float angle = speed * Time.deltaTime;
      tarAngle -= angle;  
      nowAngle -= angle;   
      if (tarAngle < 0)
      {
        Debug.Log("转盘停止转动");
        nowType = RollType.None;                                    
      }
      else
      {
        transform.localEulerAngles = new Vector3(0, 0, nowAngle);
      }                                  
    }                 
    if (nowAngle < -360)
    {
      nowAngle += 360;
    }    
  }

  public void StartQuan(float tarAngle, string giftName)
  {
    if (nowType != RollType.None)
    {
      return;
    }
    grifName = giftName;
    this.tarAngle = 360 * 2 - tarAngle;   
    nowType = RollType.Start;

    time = 0;
    nowAngle = transform.localEulerAngles.z;  
    speed = 0;   
  }
}

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