实验背景：
人：Joe、Bob和AI希望参见赛狗赌博。最初，Joe有50元，Bob有75元，AI有45元。每次比赛前，他们都会各自决定是否下注以及所押的赌金。直到比赛前，他们都可以改变赌金，但是一旦比赛开始，赌金就再不能更改了。
赌场：赌场会跟踪每个人持有的现金，以及每个人下注的对象。每次下注至少5元。一场比赛中，赌场对每个人只取一次赌金；也就是说每个人不得重复下注。赌场会检查下注的人确实有足够的现金支付他的赌金，所以如果没有钱来作赌资这个人就不能下注。
下注：每次下注都会“翻倍或全陪”，要求最低5元，而且每个人对一只狗最多下注15元。
比赛：有4只狗在直道上比赛。比赛胜者是第一只穿过终点线的狗。
书中给出的作为参考的类图：
根据这些类图得到如下代码：
namespace 赛狗日
{
public partial class frmDogRace : Form
{
private Guy[] guys;//人物类集合
private Greyhound[] greyhounds;//狗类集合
public frmDogRace()
{
InitializeComponent();
greyhounds = new Greyhound[]
{
new Greyhound(picDog1){Index=1},
new Greyhound(picDog2){Index =2},
new Greyhound(picDog3){Index =3},
new Greyhound(picDog4){Index=4},
};
guys = new Guy[]
{
new Guy(){ Name="Joe", Cash=50, MyRadioButton=rad0,MyLabel=labJoe},
new Guy(){ Name="Bob", Cash=75, MyRadioButton=rad1,MyLabel=labBob},
new Guy(){ Name="AI", Cash=45,MyRadioButton=rad2,MyLabel=labAI},
};
InitialForm();
}
/// <summary>
/// 初始化数据
/// </summary>
public void InitialForm()
{
foreach (Guy guy in guys)
{
guy.ClearBet();
guy.UpdateRadio();
}
}
private void radJoe_Click(object sender, EventArgs e)
{
labName.Text = ((RadioButton)sender).Tag.ToString();
labName.Tag = ((RadioButton)sender).Name.ToString().Substring(((RadioButton)sender).Name.ToString().Length-1, 1);
}
private void btnBets_Click(object sender, EventArgs e)
{
int i=int.Parse( labName.Tag.ToString());
Guy guy = guys[i];
if (!guy.PlaceBet(int.Parse(numAmount.Value.ToString()), int.Parse(numDog.Value.ToString())))
{ MessageBox.Show(guy.Name+"赌金不足，无法下注","提示"); }
}
private void btnRun_Click(object sender, EventArgs e)
{
//比赛开始后将不能下注
btnBets.Enabled = false;
while (true)
{
foreach (Greyhound greyhound in greyhounds)
{
if (greyhound.Run())
{
MessageBox.Show(greyhound.Index.ToString() + "号猎犬赢得比赛！");
EndRace(greyhound.Index);
return;
}
else
{
//暂停循环，刷新窗体
Application.DoEvents();
}
}
}
}
/// <summary>
/// 比赛结束需要进行的操作
/// </summary>
private void EndRace(int Winner)
{
foreach (Greyhound greyhound in greyhounds)
{
greyhound.TakeStartingPosition();
}
foreach (Guy guy in guys)
{
guy.Collect(Winner);
}
btnBets.Enabled = true;
}
}
/// <summary>
/// 狗类
/// </summary>
public class Greyhound
{
public int Index;//狗的号码
public int StartingPosition =25;//图片起始坐标
public int RacetrackLength = 455;//路程
public PictureBox MyPictureBox;//图片控件
public int Location = 0;//以完成路程
public Random Randomizer;//速度随即生成变量
public Greyhound(PictureBox picturebox)
{
this.MyPictureBox = picturebox;
}
/// <summary>
/// 狗开始跑
/// </summary>
/// <returns>是否获得第一</returns>
public bool Run()
{
Randomizer = new Random();
int speed = Randomizer.Next(1,20);
Point p = MyPictureBox.Location;
p.X += speed;
Location += speed;
System.Threading.Thread.Sleep(100);
MyPictureBox.Location = p;
if (Location >= RacetrackLength)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 回复原位
/// </summary>
public void TakeStartingPosition()
{
this.MyPictureBox.Location = new Point(this.StartingPosition,MyPictureBox.Location.Y);
this.Location = 0;
}
}
/// <summary>
/// 人物类
/// </summary>
public class Guy
{
public string Name;//姓名
public Bet Mybet=new Bet ();//赌注信息
public int Cash;//剩余现金
public RadioButton MyRadioButton;
public Label MyLabel;
/// <summary>
/// 下注更新显示信息
/// </summary>
public void UpdateRadio()
{
MyRadioButton.Text = string.Format("{0} has {1} bucks",this.Name,this.Cash.ToString());
}
/// <summary>
/// 重置赌注为0
/// </summary>
public void ClearBet()
{
MyLabel.Text=string.Format("{0} has't placed a bet",this.Name);
Mybet.Amout = 0;
}
/// <summary>
/// 下注
/// </summary>
public bool PlaceBet(int Amout, int Dog)
{
if (Amout > this.Cash)
return false;
this.Mybet.Amout = Amout;
this.Mybet.Dog = Dog;
this.Mybet.Bettor = this;
MyLabel.Text= Mybet.GetDescription();
return true;
}
/// <summary>
/// 清算结果
/// </summary>
public void Collect(int Winner)
{
this.Cash += this.Mybet.PayOut(Winner);
UpdateRadio();
ClearBet();
}
}
/// <summary>
/// 赌注类
/// </summary>
public class Bet
{
public int Amout;//下注数量
public int Dog;//猜哪只狗
public Guy Bettor;//下注者
/// <summary>
/// 获得下注信息
/// </summary>
public string GetDescription()
{
return Bettor.Name + " bets " + Amout.ToString() + " bucks on dog #" + Dog.ToString();
}
/// <summary>
/// 清算赛跑结果
/// </summary>
public int PayOut(int Winner)
{
if (Winner == Dog)
{
return Amout;
}
else
return -Amout;
}
}
}
最后得到的软件运行效果图如下：
