貪食蛇Snake (Auto Snake)

Dim snk As String '記錄蛇身體所有的位置
Dim sdir As Integer  '行進方向
Dim shead As Integer  '頭的座標
Dim apple As Integer   '蘋果座標

Private Sub Form_Load()
    For i = 0 To 360
        If i > 0 Then
            Load Command1(i)  'load可以動態產生物件
            If i Mod 19 = 0 Then
                Command1(i).Left = Command1(0).Left
                Command1(i).Top = Command1(i - 9).Top + Command1(i).Height
            Else
                Command1(i).Left = Command1(i - 1).Left + Command1(i - 1).Width
                Command1(i).Top = Command1(i - 1).Top

            End If
        End If
        If i Mod 2 = 0 Then
            Command1(i).BackColor = RGB(115, 167, 12)
        Else
            Command1(i).BackColor = RGB(162, 209, 73)
        End If
       ' Command1(i).Caption = i
        Command1(i).Visible = True
    Next
    For i = 0 To 18
        Command1(i).BackColor = vbBlack
    Next
    For i = 342 To 360
        Command1(i).BackColor = vbBlack
    Next
    For i = 0 To 342 Step 19
        Command1(i).BackColor = vbBlack
    Next
    For i = 18 To 360 Step 19
        Command1(i).BackColor = vbBlack
    Next

End Sub

Private Sub NewApple()
    apple = -1
    Do
        x = Int(Rnd * 361)
        If Command1(x).BackColor <> vbBlack And Command1(x).BackColor <> vbBlue Then
            apple = x
        End If
    Loop Until apple <> -1
    Command1(apple).BackColor = vbRed
    Command1(apple).Picture = Image2
End Sub

Private Sub Label1_Click()
    Command1(175).BackColor = vbBlue
    Command1(176).BackColor = vbBlue
    Command1(177).BackColor = vbBlue
    snk = ChrW(175) & ChrW(176) & ChrW(177)
    sdir = 1            '一開始預設向右
    shead = 177         '一開始預設蛇首117
    NewApple

    Timer1.Interval = 400
End Sub

'第一題，完成方向鍵
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
    If KeyCode = vbKeyUp Then
        sdir = -19
    ElseIf KeyCode = vbKeyDown Then
        sdir = 19
    ElseIf KeyCode = vbKeyLeft Then
        sdir = -1
    ElseIf KeyCode = vbKeyRight Then
        sdir = 1
    End If

End Sub

Private Sub Timer1_Timer()
    shead = shead + sdir

    '第二題，撞牆
    If Command1(shead).BackColor = vbBlack Then
        MsgBox "hit wall, game over"
        Timer1.Interval = 0
    End If
    '第二題，咬到自己
    If Command1(shead + sdir).BackColor = vbBlue Then
        MsgBox ("bite self")
        Timer1.Interval = 0
    End If

    '第三題，吃蘋果len+1
    '更新snk座標，
    '如果吃到蘋果，長度+1，留住最後一截尾巴，
    '若沒吃到，消掉最後一截尾巴
    If shead = apple Then
        Command1(apple).Picture = LoadPicture()
        If apple Mod 2 = 0 Then
            Command1(apple).BackColor = RGB(115, 167, 12)
        Else
            Command1(apple).BackColor = RGB(162, 209, 73)
        End If
        snk = snk & ChrW(apple)
        NewApple

    Else
        '先記錄尾巴座標
        stail = AscW(Mid(snk, 1, 1))
        snk = Mid(snk, 2, Len(snk)) & ChrW(shead)  'snk削掉尾巴最後一格
        '繪圖，snk削掉尾巴最後一格，還是要符合馬賽克磚
        i = stail
        If i Mod 2 = 0 Then
            Command1(i).BackColor = RGB(115, 167, 12)
        Else
            Command1(i).BackColor = RGB(162, 209, 73)
        End If

    End If
    If Int(shead / 19) > Int(apple / 19) And Command1(shead - 19).BackColor <> vbBlue Then
        sdir = -19
    ElseIf Int(shead / 19) < Int(apple / 19) And Command1(shead + 19).BackColor <> vbBlue Then
        sdir = 19
    ElseIf shead Mod 19 > apple Mod 19 And Command1(shead - 1).BackColor <> vbBlue Then
        sdir = -1
    ElseIf shead Mod 19 < apple Mod 19 And Command1(shead + 1).BackColor <> vbBlue Then
        sdir = 1
    End If


    '繪圖，頭前進一格
    Command1(shead).BackColor = vbBlue

    Label2 = Len(snk) '目前蛇的長度
End Sub