'定义棋盘格子数据结构
Private Type Wells
    Wells_X As Long
    Wells_Y As Long
    Wells_Value As Integer
End Type
   
'定义棋盘格子的实例数组
Private usrWells(1 To 9) As Wells
    
'定义响应点击操作的逻辑棋盘格子代号数组
Private intWellsIndex(1 To 3, 1 To 3) As Integer
    
'定义玩家的玩过的盘数和积分
Private lngPlayerTurn As Integer, lngPlayerScore As Long

'定义游戏开始标志
Private blnGameStart As Boolean

'定义玩家胜利和失败标志
Private blnPlayerWin As Boolean, blnPlayerLost As Boolean

'定义枚举常量标识玩家类型
Private Enum Player
    MAN = 0
    COMPUTER = 1
End Enum

'该过程用于显示游戏信息
Private Sub Form_Load()
    Me.Show
    Me.Caption = "BS井字游戏 — (版本 " & App.Major & "." & App.Minor & "." & App.Revision & ")"
End Sub

'该过程用于重新开始开始游戏
Private Sub cmdGameStart_Click()
    blnGameStart = True
    lngPlayerTurn = lngPlayerTurn + 1
    Me.picWells.Cls
    Call subGameInitialize
    Call subScreenRefresh
End Sub

'该过程用于显示游戏规则
Private Sub CmdGameRules_Click()
    Beep
    MsgBox " BS井字游戏：一个最简单的智力游戏，您将与机" & Chr(13) & _
           "器在9个格子大小的棋盘上一决高下。由您先开始" & Chr(13) & _
           "和机器轮流，每次在任意的空格上下一枚棋子。先" & Chr(13) & _
           "在棋盘上横向、纵向或对角线上排成三枚相同棋子" & Chr(13) & _
           "的一方即可获得游戏的胜利，祝您好运！！", 0 + 64, "游戏规则"
End Sub

'该过程用于显示游戏开发信息
Private Sub cmdAbout_Click()
    Beep
    MsgBox "BS井字游戏" & "(V-" & App.Major & "." & App.Minor & "版本)" & Chr(13) & Chr(13) & _
           "" & Chr(13) & Chr(13) & _
           "由PigheadPrince设计制作" & Chr(13) & _
           "CopyRight(C)2002,BestSoft.TCG", 0, "关于本游戏"
End Sub

'该过程用于退出游戏
Private Sub cmdExit_Click()
    Beep
    msg = MsgBox("您要退出本游戏吗？", 4 + 32, "BS井字游戏")
    If msg = 6 Then End
End Sub

'该过程用于实现玩家向井字棋盘中下棋子
Private Sub picWells_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    Dim lngGetWells_X As Long, lngGetWells_Y As Long
    Dim blnWellsNotFull As Boolean
    If Not blnGameStart Then Exit Sub
    lngGetWells_X = Int(Y / (Me.picWells.Height / 3)) + 1
    lngGetWells_Y = Int(X / (Me.picWells.Width / 3)) + 1
    If usrWells(intWellsIndex(lngGetWells_X, lngGetWells_Y)).Wells_Value = 0 Then
       usrWells(intWellsIndex(lngGetWells_X, lngGetWells_Y)).Wells_Value = 1
       Me.picWells.PaintPicture Me.imgChequer(MAN).Picture, _
                                usrWells(intWellsIndex(lngGetWells_X, lngGetWells_Y)).Wells_X, _
                                usrWells(intWellsIndex(lngGetWells_X, lngGetWells_Y)).Wells_Y, _
                                Me.picWells.Width / 3, Me.picWells.Height / 3
       If funPlayerWinIF(MAN) Then
          Beep
          MsgBox "恭喜，您胜利了！", , "BS井字游戏"
          lngPlayerScore = lngPlayerScore + 100
          Call subScreenRefresh
          blnGameStart = False
       Else
          blnPlayerTurn = False
          For i = 1 To 9
              If usrWells(i).Wells_Value = 0 Then blnWellsNotFull = True
          Next i
          If blnWellsNotFull Then
             Call subComputerDoing
          Else
             Beep
             MsgBox "和局！", , "BS井字游戏"
             blnGameStart = False
          End If
       End If
    End If
End Sub

'该自定义子过程用于游戏数据初始化
Private Sub subGameInitialize()
    intWellsIndex(1, 1) = 1
    intWellsIndex(1, 2) = 2
    intWellsIndex(1, 3) = 3
    intWellsIndex(2, 1) = 4
    intWellsIndex(2, 2) = 5
    intWellsIndex(2, 3) = 6
    intWellsIndex(3, 1) = 7
    intWellsIndex(3, 2) = 8
    intWellsIndex(3, 3) = 9
    For i = 1 To 7 Step 3
        usrWells(i).Wells_X = 0
    Next i
    For i = 2 To 8 Step 3
        usrWells(i).Wells_X = Me.picWells.Width * (1 / 3)
    Next i
    For i = 3 To 9 Step 3
        usrWells(i).Wells_X = Me.picWells.Width * (2 / 3)
    Next i
    For i = 1 To 3 Step 1
        usrWells(i).Wells_Y = 0
    Next i
    For i = 4 To 6 Step 1
        usrWells(i).Wells_Y = Me.picWells.Height * (1 / 3)
    Next i
    For i = 7 To 9 Step 1
        usrWells(i).Wells_Y = Me.picWells.Height * (2 / 3)
    Next i
    For i = 1 To 9
        usrWells(i).Wells_Value = 0
    Next i
End Sub

'该自定义子过程用于游戏开始时刷新屏幕
Private Sub subScreenRefresh()
    Me.lblPlayerTurns.Caption = lngPlayerTurn
    Me.lblPlayerScore.Caption = lngPlayerScore
    Me.picWells.Line (0, Me.picWells.Height * (1 / 3))-(Me.picWells.Width, Me.picWells.Height * (1 / 3)), vbBlack
    Me.picWells.Line (0, Me.picWells.Height * (2 / 3))-(Me.picWells.Width, Me.picWells.Height * (2 / 3)), vbBlack
    Me.picWells.Line (Me.picWells.Width * (1 / 3), 0)-(Me.picWells.Width * (1 / 3), Me.picWells.Height), vbBlack
    Me.picWells.Line (Me.picWells.Width * (2 / 3), 0)-(Me.picWells.Width * (2 / 3), Me.picWells.Height), vbBlack
End Sub

'该自定义子过程用于执行机器的下子
Private Sub subComputerDoing()
    Randomize
    Dim lngGetWells_X As Long, lngGetWells_Y As Long
    Dim intPCFirstWells As Integer
    Dim blnPCWellsExists As Boolean
    Dim intPCWells As Integer
    For i = 1 To 9 Step 1
        If usrWells(i).Wells_Value = -1 Then
           blnPCWellsExists = True
        End If
    Next i
    If Not blnPCWellsExists Then
       GoTo GetPCFirstWells:
    Else
       GoTo GetPCNextWells:
    End If
    
GetPCFirstWells: '随机获得机器的第一个落子位置
    intPCFirstWells = Int((9 - 1 + 1) * Rnd + 1)
    If usrWells(intPCFirstWells).Wells_Value <> 0 Then
       GoTo GetPCFirstWells:
    Else
       intPCWells = intPCFirstWells
    End If
    GoTo GoOn:
     
GetPCNextWells:  '获得机器下一步的落子位置
    intPCWells = funGetPCWells
    
GoOn:            '绘制落子并判断胜利
    usrWells(intPCWells).Wells_Value = -1
    lngGetWells_X = usrWells(intPCWells).Wells_X
    lngGetWells_Y = usrWells(intPCWells).Wells_Y
       Me.picWells.PaintPicture Me.imgChequer(COMPUTER).Picture, lngGetWells_X, lngGetWells_Y, _
                                Me.picWells.Width / 3, Me.picWells.Height / 3
       If funPlayerWinIF(COMPUTER) Then
          Beep
          MsgBox "抱歉，您失败了！", , "BS井字游戏"
          lngPlayerScore = lngPlayerScore - 100
          If lngPlayerScore < 0 Then lngPlayerScore = 0
          Call subScreenRefresh
          blnGameStart = False
       Else
          blnPlayerTurn = True
       End If
End Sub

'该自定义函数用于判断玩家是否胜利
Private Function funPlayerWinIF(PlayerType As Integer) As Boolean
    Dim intWinCase(1 To 8) As Integer
    intWinCase(1) = usrWells(1).Wells_Value + usrWells(2).Wells_Value + usrWells(3).Wells_Value
    intWinCase(2) = usrWells(4).Wells_Value + usrWells(5).Wells_Value + usrWells(6).Wells_Value
    intWinCase(3) = usrWells(7).Wells_Value + usrWells(8).Wells_Value + usrWells(9).Wells_Value
    intWinCase(4) = usrWells(1).Wells_Value + usrWells(4).Wells_Value + usrWells(7).Wells_Value
    intWinCase(5) = usrWells(2).Wells_Value + usrWells(5).Wells_Value + usrWells(8).Wells_Value
    intWinCase(6) = usrWells(3).Wells_Value + usrWells(6).Wells_Value + usrWells(9).Wells_Value
    intWinCase(7) = usrWells(1).Wells_Value + usrWells(5).Wells_Value + usrWells(9).Wells_Value
    intWinCase(8) = usrWells(3).Wells_Value + usrWells(5).Wells_Value + usrWells(7).Wells_Value
    Select Case PlayerType
       Case MAN
          If intWinCase(1) = 3 Or intWinCase(2) = 3 Or intWinCase(3) = 3 Or intWinCase(4) = 3 Or _
             intWinCase(5) = 3 Or intWinCase(6) = 3 Or intWinCase(7) = 3 Or intWinCase(8) = 3 Then
             blnPlayerWin = True
             blnPlayerLost = False
             funPlayerWinIF = blnPlayerWin
          End If
       Case COMPUTER
          If intWinCase(1) = -3 Or intWinCase(2) = -3 Or intWinCase(3) = -3 Or intWinCase(4) = -3 Or _
             intWinCase(5) = -3 Or intWinCase(6) = -3 Or intWinCase(7) = -3 Or intWinCase(8) = -3 Then
             blnPlayerWin = False
             blnPlayerLost = True
             funPlayerWinIF = blnPlayerLost
          End If
    End Select
End Function

'该自定义函数用于返回机器的落子
Private Function funGetPCWells() As Integer
    Dim intWells(1 To 8) As Integer, intPCRandomWells As Integer
    intWells(1) = usrWells(1).Wells_Value + usrWells(2).Wells_Value + usrWells(3).Wells_Value
    intWells(2) = usrWells(4).Wells_Value + usrWells(5).Wells_Value + usrWells(6).Wells_Value
    intWells(3) = usrWells(7).Wells_Value + usrWells(8).Wells_Value + usrWells(9).Wells_Value
    intWells(4) = usrWells(1).Wells_Value + usrWells(4).Wells_Value + usrWells(7).Wells_Value
    intWells(5) = usrWells(2).Wells_Value + usrWells(5).Wells_Value + usrWells(8).Wells_Value
    intWells(6) = usrWells(3).Wells_Value + usrWells(6).Wells_Value + usrWells(9).Wells_Value
    intWells(7) = usrWells(1).Wells_Value + usrWells(5).Wells_Value + usrWells(9).Wells_Value
    intWells(8) = usrWells(3).Wells_Value + usrWells(5).Wells_Value + usrWells(7).Wells_Value
    ' 如果任何一线已有机器的两个子并且另外一格仍空，机器方即将成一线
    ' 机器落子的结果等于该空格
    If intWells(1) = -2 Then
       For i = 1 To 3 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(2) = -2 Then
       For i = 4 To 6 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(3) = -2 Then
       For i = 7 To 9 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(4) = -2 Then
       For i = 1 To 7 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(5) = -2 Then
       For i = 2 To 8 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(6) = -2 Then
       For i = 3 To 9 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(7) = -2 Then
       For i = 1 To 9 Step 4
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(8) = -2 Then
       For i = 3 To 7 Step 2
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    End If
    '如果任何一线已有玩家方两个子并且另外一格仍空，防止玩家方作成一线
    '机器落子的结果等于该空格
    If intWells(1) = 2 Then
       For i = 1 To 3 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(2) = 2 Then
       For i = 4 To 6 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(3) = 2 Then
       For i = 7 To 9 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(4) = 2 Then
       For i = 1 To 7 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(5) = 2 Then
       For i = 2 To 8 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(6) = 2 Then
       For i = 3 To 9 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(7) = 2 Then
       For i = 1 To 9 Step 4
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(8) = 2 Then
       For i = 3 To 7 Step 2
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    End If
    '如果任何一线已有机器方一个子并且另外两格仍空，作成机器方的两个子
    '机器落子的结果等于该空格
    If intWells(1) = -1 Then
       For i = 1 To 3 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(2) = -1 Then
       For i = 4 To 6 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(3) = -1 Then
       For i = 7 To 9 Step 1
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(4) = -1 Then
       For i = 1 To 7 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(5) = -1 Then
       For i = 2 To 8 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(6) = -1 Then
       For i = 3 To 9 Step 3
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(7) = -1 Then
       For i = 1 To 9 Step 4
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    ElseIf intWells(8) = -1 Then
       For i = 3 To 7 Step 2
           If usrWells(i).Wells_Value = 0 Then
              funGetPCWells = i
              Exit Function
           End If
       Next i
    End If
    '面临和局，随机在空白的格子内落子
GetRandomWells:
    Randomize
    intPCRandomWells = Int((9 - 1 + 1) * Rnd + 1)
    If usrWells(intPCRandomWells).Wells_Value = 0 Then
       funGetPCWells = intPCRandomWells
    Else
       GoTo GetRandomWells:
    End If
End Function