对于改变随机数范围大小出现频率的操作

以下内容参照《unity3d 人工智能编程》--Aung Sithu Kyaw，Clifford Peters ，Thet Naing Swe编著</span>

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using UnityEngine;
using System.Collections;

public class SlotMachineWeighted : MonoBehaviour
{
//滚动间隔
public float spinDuration = 2.0f;
//数字
public int numberOfSym = 10;
//组件
public GameObject betResult;
//标志位
private bool isStartSpin = false;
private bool isFirstReelSpinned = false;
private bool isSecondReelSpinned = false;
private bool isThirdReelSpinned = false;
//赌金
private int betAmount = 100;
//作弊设置
private int creditBalance = 1000;
private ArrayList weightedReelPoll = new ArrayList();
private int zeroProbability = 30;
//滚轮
private int firstReelResult = 0;
private int secondReelResult = 0;
private int thirdReelResult = 0;
//计时器
private float elapsedTime = 0.0f;

// Use this for initialization
void Start()
{
//初始化
betResult.GetComponent<GUIText>().text = "";

for (int i = 0; i < zeroProbability; i++)
{
weightedReelPoll.Add(0);
}
//剩余可能值
int remainingValuesProb = (100 - zeroProbability) / 9;

//初始化数组
for (int j = 1; j < 10; j++)
{
for (int k = 0; k < remainingValuesProb; k++)
{
weightedReelPoll.Add(j);
}
}
}

void OnGUI()
{
//显示设置
GUI.Label(new Rect(150, 40, 100, 20), "Your bet: ");
betAmount = int.Parse(GUI.TextField(new Rect(220, 40, 50, 20), betAmount.ToString(), 25));

GUI.Label(new Rect(300, 40, 100, 20), "Credits: " + creditBalance.ToString());

if (GUI.Button(new Rect(200, 300, 150, 40), "Pull Lever"))
{
betResult.GetComponent<GUIText>().text = "";
isStartSpin = true;
}
}

void checkBet()
{
if (firstReelResult == secondReelResult && secondReelResult == thirdReelResult)
{
//最大胜率，赢得50倍
betResult.GetComponent<GUIText>().text = "JACKPOT!";
creditBalance += betAmount * 50;
}
else if (firstReelResult == 0 && thirdReelResult == 0)
{
//输掉一半，伪胜利
betResult.GetComponent<GUIText>().text = "YOU WIN " + (betAmount / 2).ToString();
creditBalance -= (betAmount / 2);
}
else if (firstReelResult == secondReelResult)
{
//吸引玩家，接近胜利的状态
betResult.GetComponent<GUIText>().text = "AWW... ALMOST JACKPOT!";
}
else if (firstReelResult == thirdReelResult)
{
//赢得2倍奖金
betResult.GetComponent<GUIText>().text = "YOU WIN " + (betAmount * 2).ToString();
creditBalance -= (betAmount * 2);
}
else
{
//失败
betResult.GetComponent<GUIText>().text = "YOU LOSE!";
creditBalance -= betAmount;
}
}

// Update is called once per frame
void FixedUpdate()
{
if (isStartSpin)
{
//计时
elapsedTime += Time.deltaTime;
//取数
int randomSpinResult = Random.Range(0, numberOfSym);
if (!isFirstReelSpinned)
{
//第一位数
GameObject.Find("firstReel").GetComponent<GUIText>().text = randomSpinResult.ToString();
if (elapsedTime >= spinDuration)
{
//生成第一个数
int weightedRandom = Random.Range(0, weightedReelPoll.Count);
GameObject.Find("firstReel").GetComponent<GUIText>().text = weightedReelPoll[weightedRandom].ToString();
firstReelResult = (int)weightedReelPoll[weightedRandom];
isFirstReelSpinned = true;
elapsedTime = 0;
}
}
else if (!isSecondReelSpinned)
{
//获得第二个数字
GameObject.Find("secondReel").GetComponent<GUIText>().text = randomSpinResult.ToString();
if (elapsedTime >= spinDuration)
{
secondReelResult = randomSpinResult;
isSecondReelSpinned = true;
elapsedTime = 0;
}
}
else if (!isThirdReelSpinned)
{
GameObject.Find("thirdReel").GetComponent<GUIText>().text = randomSpinResult.ToString();
if (elapsedTime >= spinDuration)
//判断生成的三个和第二个数是否相同
if ((firstReelResult == secondReelResult) &&
//第一个数和其他两个数不同
randomSpinResult != firstReelResult)
{
//the first two reels have resulted the same symbol
//but unfortunately the third reel missed
//so instead of giving a random number we'll return a symbol which is one less than the other 2
//作弊的操作，
randomSpinResult = firstReelResult - 1;
if (randomSpinResult < firstReelResult) randomSpinResult = firstReelResult - 1;
if (randomSpinResult > firstReelResult) randomSpinResult = firstReelResult + 1;
if (randomSpinResult < 0) randomSpinResult = 0;
if (randomSpinResult > 9) randomSpinResult = 9;
//重新赋值第三个数
GameObject.Find("thirdReel").GetComponent<GUIText>().text = randomSpinResult.ToString();
thirdReelResult = randomSpinResult;
}
else
{
//直接赋值，不需要作弊
int weightedRandom = Random.Range(0, weightedReelPoll.Count);
GameObject.Find("thirdReel").GetComponent<GUIText>().text = weightedReelPoll[weightedRandom].ToString();
thirdReelResult = (int)weightedReelPoll[weightedRandom];
}
//更新标志位
isStartSpin = false;
elapsedTime = 0;
isFirstReelSpinned = false;
isSecondReelSpinned = false;

checkBet();
}
}
}
}