'定義棋盤格子數據結構
Private Type Wells
    Wells_X As Long
    Wells_Y As Long
    Wells_Value As Integer
End Type
   
'定義棋盤格子的實例數組
Private usrWells(1 To 9) As Wells
    
'定義響應點擊操作的邏輯棋盤格子代號數組
Private intWellsIndex(1 To 3, 1 To 3) As Integer
    
'定義玩家的玩過的盤數和積分
Private lngPlayerTurn As Integer, lngPlayerScore As Long

'定義游戲開始標志
Private blnGameStart As Boolean

'定義玩家勝利和失敗標志
Private blnPlayerWin As Boolean, blnPlayerLost As Boolean

'定義枚舉常量標識玩家類型
Private Enum Player
    MAN = 0
    COMPUTER = 1
End Enum

'該過程用于顯示游戲信息
Private Sub Form_Load()
    Me.Show
    Me.Caption = "BS井字游戲 — (版本 " & App.Major & "." & App.Minor & "." & App.Revision & ")"
End Sub

'該過程用于重新開始開始游戲
Private Sub cmdGameStart_Click()
    blnGameStart = True
    lngPlayerTurn = lngPlayerTurn + 1
    Me.picWells.Cls
    Call subGameInitialize
    Call subScreenRefresh
End Sub

'該過程用于顯示游戲規則
Private Sub CmdGameRules_Click()
    Beep
    MsgBox " BS井字游戲：一個最簡單的智力游戲，您將與機" & Chr(13) & _
           "器在9個格子大小的棋盤上一決高下。由您先開始" & Chr(13) & _
           "和機器輪流，每次在任意的空格上下一枚棋子。先" & Chr(13) & _
           "在棋盤上橫向、縱向或對角線上排成三枚相同棋子" & Chr(13) & _
           "的一方即可獲得游戲的勝利，祝您好運�。�", 0 + 64, "游戲規則"
End Sub

'該過程用于顯示游戲開發信息
Private Sub cmdAbout_Click()
    Beep
    MsgBox "BS井字游戲" & "(V-" & App.Major & "." & App.Minor & "版本)" & Chr(13) & Chr(13) & _
           "" & Chr(13) & Chr(13) & _
           "由PigheadPrince設計制作" & Chr(13) & _
           "CopyRight(C)2002,BestSoft.TCG", 0, "關于本游戲"
End Sub

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

'該過程用于實現玩家向井字棋盤中下棋子
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，您勝利了！", , "BS井字游戲"
          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井字游戲"
             blnGameStart = False
          End If
       End If
    End If
End Sub

'該自定義子過程用于游戲數據初始化
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

'該自定義子過程用于游戲開始時刷新屏幕
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

'該自定義子過程用于執行機器的下子
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: '隨機獲得機器的第一個落子位置
    intPCFirstWells = Int((9 - 1 + 1) * Rnd + 1)
    If usrWells(intPCFirstWells).Wells_Value <> 0 Then
       GoTo GetPCFirstWells:
    Else
       intPCWells = intPCFirstWells
    End If
    GoTo GoOn:
     
GetPCNextWells:  '獲得機器下一步的落子位置
    intPCWells = funGetPCWells
    
GoOn:            '繪制落子并判斷勝利
    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，您失敗了！", , "BS井字游戲"
          lngPlayerScore = lngPlayerScore - 100
          If lngPlayerScore < 0 Then lngPlayerScore = 0
          Call subScreenRefresh
          blnGameStart = False
       Else
          blnPlayerTurn = True
       End If
End Sub

'該自定義函數用于判斷玩家是否勝利
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

'該自定義函數用于返回機器的落子
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
    ' 如果任何一線已有機器的兩個子并且另外一格仍空，機器方即將成一線
    ' 機器落子的結果等于該空格
    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
    '如果任何一線已有玩家方兩個子并且另外一格仍空，防止玩家方作成一線
    '機器落子的結果等于該空格
    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
    '如果任何一線已有機器方一個子并且另外兩格仍空，作成機器方的兩個子
    '機器落子的結果等于該空格
    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
    '面臨和局，隨機在空白的格子內落子
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