<script language="vbscript" runat="server">

    Option Explicit ‘显示声明
    Dim showErrorImg
    showErrorImg = False

    function ChkPost() 
        dim server_v1,server_v2
        chkpost=false
        server_v1=Cstr(Request.ServerVariables("HTTP_REFERER"))
        server_v2=Cstr(Request.ServerVariables("SERVER_NAME"))
        If Mid(server_v1,8,Len(server_v2))<>server_v2 then
            chkpost=False
        else
            chkpost=True
        end If
    end Function

    If Not ChkPost() Then
        showErrorImg = true
    End If
    
    

    Class Com_GifCode_Class
        Public Noisy, Count, Width, Height, Angle, Offset, Border
        Private Graph(), Margin(3)
        Private Sub Class_Initialize()
            Randomize 
            Noisy = 1 ‘ 干扰点出现的概率 
            Count = 4  ‘ 字符数量
            Width = 40 ‘ 图片宽度
            Height = 20 ‘ 图片高度
            Angle = 2  ‘ 角度随机变化量
            Offset = 15 ‘ 偏移随机变化量
            Border = 1.5 ‘ 边框大小
        End Sub 
        
        Public Function Create2(str)
            Dim i
            Dim vIndex
            ReDim Graph(Width-1, Height-1)
            For i = 0 To Count - 1
                vIndex=CInt(Mid(str,i+1,1)-1)
                SetDraw vIndex, i
            Next
        End Function
    
        Sub SetDot(pX, pY)
            If pX * (Width-pX-1) >= 0 And pY * (Height-pY-1) >= 0 Then
                Graph(pX, pY) = 1
            End If
        End Sub

        Public Sub SetDraw(pIndex, pNumber)
            ‘ 字符数据字典
            If pIndex=-1 Then pIndex=9

            Dim DotData(9)
            DotData(0) = Array(30, 15, 50, 1, 50, 100)
            DotData(1) = Array(1 ,34 ,30 ,1 ,71, 1, 100, 34, 1, 100, 93, 100, 100, 86) 
            DotData(2) = Array(1, 1, 100, 1, 42, 42, 100, 70, 50, 100, 1, 70)
            DotData(3) = Array(100, 73, 6, 73, 75, 6, 75, 100)
            DotData(4) = Array(100, 1, 1, 1, 1, 50, 50, 35, 100, 55, 100, 80, 50, 100, 1, 95)
            DotData(5) = Array(100, 20, 70, 1, 20, 1, 1, 30, 1, 80, 30, 100, 70, 100, 100, 80, 100, 60, 70, 50, 30, 50, 1, 60) 
            DotData(6) = Array(6, 26, 6, 6, 100, 6, 53, 100)
            DotData(7) = Array(100, 30, 100, 20, 70, 1, 30, 1, 1, 20, 1, 30, 100, 70, 100, 80, 70, 100, 30, 100, 1, 80, 1, 70, 100, 30)
            DotData(8) = Array(1, 80, 30, 100, 80, 100, 100, 70, 100, 20, 70, 1, 30, 1, 1, 20, 1, 40, 30, 50, 70, 50, 100, 40) 
            DotData(9) = Array(100, 20, 70, 1, 20, 1, 1, 30, 1, 80, 30, 100, 70, 100, 100, 80, 100, 60, 90, 20, 80,3)


            Dim vExtent : vExtent = Width / Count
            
            Margin(0) = Border + vExtent * (Rnd * Offset) / 100 + Margin(1)
            
            Margin(1) = vExtent * (pNumber + 1) - Border - vExtent * (Rnd * Offset) / 100
            
            Margin(2) = Border + Height * (Rnd * Offset) / 100
            
            Margin(3) = Height - Border - Height * (Rnd * Offset) / 100

            Dim vStartX, vEndX, vStartY, vEndY
            Dim vWidth, vHeight, vDX, vDY, vDeltaT
            Dim vAngle, vLength

            vWidth =Int(Margin(1) - Margin(0))
            vHeight =Int(Margin(3) - Margin(2))
            vStartX = Int((DotData(pIndex)(0)-1) * vWidth / 100)
            vStartY = Int((DotData(pIndex)(1)-1) * vHeight / 100)

            Dim i, j
            For i = 1 To UBound(DotData(pIndex), 1)/2
                If DotData(pIndex)(2*i-2) <> 0 And DotData(pIndex)(2*i) <> 0 Then 
                    vEndX = (DotData(pIndex)(2*i)-1) * vWidth / 100
                    vEndY = (DotData(pIndex)(2*i+1)-1) * vHeight / 100
                    vDX = vEndX - vStartX
                    vDY = vEndY - vStartY
                    If vDX = 0 Then
                        vAngle = Sgn(vDY) * 3.14 /2
                    Else
                        vAngle = Atn(vDY / vDX)
                    End If
                    If Sin(vAngle) = 0 Then
                        vLength = vDX
                    Else
                        vLength = vDY / Sin(vAngle)
                    End If
                    vAngle = vAngle + (Rnd - 0.5) * 2 * Angle * 3.14 * 2 / 100
                    vDX = Int(Cos(vAngle) * vLength)
                    vDY = Int(Sin(vAngle) * vLength)
                    If Abs(vDX) > Abs(vDY) Then vDeltaT = Abs(vDX) Else vDeltaT = Abs(vDY)
                    For j = 1 To vDeltaT
                        SetDot Margin(0) + vStartX + j * vDX / vDeltaT, Margin(2) + vStartY + j * vDY / vDeltaT 
                    Next
                    vStartX = vStartX + vDX
                    vStartY = vStartY + vDY
                End If
            Next
        End Sub

        Public Sub Output()
            Response.Expires = -9999
            Response.AddHeader "pragma", "no-cache"
            Response.AddHeader "cache-ctrol", "no-cache"
            Response.ContentType = "image/gif" 
            Response.BinaryWrite ChrB(Asc("G")) & ChrB(Asc("I")) & ChrB(Asc("F"))
            Response.BinaryWrite ChrB(Asc("8")) & ChrB(Asc("9")) & ChrB(Asc("a")) 
            Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
            Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)
            Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(0) 
            Response.BinaryWrite ChrB(250) & ChrB(250) & ChrB(250)
            Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0)
            Response.BinaryWrite ChrB(Asc(","))
            Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) 
            Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
            Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)
            Response.BinaryWrite ChrB(0) & ChrB(7) & ChrB(255) 

            Dim x, y, i : i = 0
            For y = 0 To Height - 1
                For x = 0 To Width - 1
                    If Rnd < Noisy / 100 Then
                        Response.BinaryWrite ChrB(1-Graph(x, y))
                    ElseIf x * (x-Width) = 0 Or y * (y-Height) = 0 Then 
                        Response.BinaryWrite ChrB(Graph(x, y))
                    ElseIf Graph(x-1, y) = 1 Or Graph(x, y) Or Graph(x, y-1) = 1 Then
                        Response.BinaryWrite ChrB(1)
                    Else
                        Response.BinaryWrite ChrB(0)
                    End If

                    If (y * Width + x + 1) Mod 126 = 0 Then
                        Response.BinaryWrite ChrB(128)
                        i = i + 1
                    End If
                    If (y * Width + x + i + 1) Mod 255 = 0 Then
                        If (Width*Height - y * Width - x - 1) > 255 Then 
                            Response.BinaryWrite ChrB(255)
                        Else
                            Response.BinaryWrite ChrB(Width * Height Mod 255)
                        End If
                    End If
                Next
            Next
            Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(129) & ChrB(0) & ChrB(59) 
        End Sub
    End Class
    ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘
     
    Dim mCode
    Set mCode = New Com_GifCode_Class
  
    Randomize
    Dim code
    code = Int(Rnd * 9000 + 1000)
    If showErrorImg Then
        Session("GetCode") = Int(Rnd * 9000 + 1000)
    else
        Session("GetCode") = code
    End If
        
    mCode.Create2(code)
    mCode.Output()

    
</script>

<%
Const nMaxSaturation = 100            ‘ 最大色彩饱和度
Const nBlankNoisyDotOdds = 0.2  ‘ 空白处噪点率
Const nColorNoisyDotOdds = 0 ‘ 有色处噪点率
Const nCharCount = 5                        ‘ 产生的字符个数
Const nPixelWidth = 20                    ‘ 单个字符位图的宽度
Const nPixelHeight = 20                   ‘ 单个字符位图的高度
Const nColorHue = 000                        ‘ 显示验证码的色调(-1表示随机色调, -2表示灰度色调)
Const nAngleRandom = 10         ‘ 角度随机量
Const nLengthRandom = 10        ‘ 长度随机量(百分比)
Const cCharSet = "0123456789"
                                ‘ 构成验证码的字符集
                                ‘ 如果扩充了下边的字母矢量库，则可以相应扩充这个字符集

Dim Buf(), DigtalStr
Dim Lines(), LineCount
Dim CursorX, CursorY, DirX, DirY

Randomize
Call CreatValidCode("GetCode")

Sub CDGen_Reset()
    ‘ 复位矢量笔和环境变量
    LineCount = 0
    CursorX = 0
    CursorY = 0
    ‘ 初始的光笔方向是垂直向下
    DirX = 0
    DirY = 1
End Sub

Sub CDGen_Clear()
    ‘ 清空位图阵列
    Dim i, j
    ReDim Buf(nPixelHeight - 1, nCharCount * nPixelWidth - 1)

    For j = 0 To nPixelHeight - 1
        For i = 0 To nCharCount * nPixelWidth - 1
            Buf(j, i) = 0
        Next
    Next
End Sub

Sub CDGen_PSet(X, Y)
    ‘ 在位图阵列上画点
    Buf(Y, X) = 1
End Sub

Sub CDGen_Line(X1, Y1, X2, Y2)
    ‘ 在位图阵列上画线
    Dim DX, DY, DeltaT, i
    
    DX = X2 - X1
    DY = Y2 - Y1
    If Abs(DX) > Abs(DY) Then DeltaT = Abs(DX) Else DeltaT = Abs(DY)
    For i = 0 To DeltaT
        CDGen_PSet X1 + DX * i / DeltaT, Y1 + DY * i / DeltaT
    Next
End Sub

Sub CDGen_FowardDraw(nLength)
    ‘ 按当前光笔方向绘制指定长度并移动光笔，正数表示从左向右/从上向下绘制，负数表示从右向左/从下向上绘制
    nLength = Sgn(nLength) * Abs(nLength) * (1 - nLengthRandom / 100 + Rnd * nLenghtRandom * 2 / 100)
    ReDim Preserve Lines(3, LineCount)
    Lines(0, LineCount) = CursorX
    Lines(1, LineCount) = CursorY
    CursorX = CursorX + DirX * nLength
    CursorY = CursorY + DirY * nLength
    Lines(2, LineCount) = CursorX
    Lines(3, LineCount) = CursorY
    LineCount = LineCount + 1
End Sub

Sub CDGen_SetDirection(nAngle)
    ‘ 按指定角度设定画笔方向, 正数表示相对当前方向顺时针改变方向，负数表示相对当前方向逆时针改变方向
    Dim DX, DY
    
    nAngle = Sgn(nAngle) * (Abs(nAngle) - nAngleRandom + Rnd * nAngleRandom * 2) / 180 * 3.1415926
    DX = DirX
    DY = DirY
    DirX = DX * Cos(nAngle) - DY * Sin(nAngle)
    DirY = DX * Sin(nAngle) + DY * Cos(nAngle)
End Sub

Sub CDGen_MoveToMiddle(nActionIndex, nPercent)
    ‘ 将画笔光标移动到指定动作的中间点上，nPercent为中间位置的百分比
    Dim DeltaX, DeltaY
    
    DeltaX = Lines(2, nActionIndex) - Lines(0, nActionIndex)
    DeltaY = Lines(3, nActionIndex) - Lines(1, nActionIndex)
    CursorX = Lines(0, nActionIndex) + Sgn(DeltaX) * Abs(DeltaX) * nPercent / 100
    CursorY = Lines(1, nActionIndex) + Sgn(DeltaY) * Abs(DeltaY) * nPercent / 100
End Sub

Sub CDGen_MoveCursor(nActionIndex)
    ‘ 将画笔光标移动到指定动作的起始点上
    CursorX = Lines(0, nActionIndex)
    CursorY = Lines(1, nActionIndex)
End Sub

Sub CDGen_Close(nActionIndex)
    ‘ 将当前光笔位置与指定动作的起始点闭合并移动光笔
    ReDim Preserve Lines(3, LineCount)
    Lines(0, LineCount) = CursorX
    Lines(1, LineCount) = CursorY
    CursorX = Lines(0, nActionIndex)
    CursorY = Lines(1, nActionIndex)
    Lines(2, LineCount) = CursorX
    Lines(3, LineCount) = CursorY
    LineCount = LineCount + 1
End Sub

Sub CDGen_CloseToMiddle(nActionIndex, nPercent)
    ‘ 将当前光笔位置与指定动作的中间点闭合并移动光笔，nPercent为中间位置的百分比
    Dim DeltaX, DeltaY
    
    ReDim Preserve Lines(3, LineCount)
    Lines(0, LineCount) = CursorX
    Lines(1, LineCount) = CursorY
    DeltaX = Lines(2, nActionIndex) - Lines(0, nActionIndex)
    DeltaY = Lines(3, nActionIndex) - Lines(1, nActionIndex)
    CursorX = Lines(0, nActionIndex) + Sgn(DeltaX) * Abs(DeltaX) * nPercent / 100
    CursorY = Lines(1, nActionIndex) + Sgn(DeltaY) * Abs(DeltaY) * nPercent / 100
    Lines(2, LineCount) = CursorX
    Lines(3, LineCount) = CursorY
    LineCount = LineCount + 1
End Sub

Sub CDGen_Flush(X0, Y0)
    ‘ 按照当前的画笔动作序列绘制位图点阵
    Dim MaxX, MinX, MaxY, MinY
    Dim DeltaX, DeltaY, StepX, StepY, OffsetX, OffsetY
    Dim i

    MaxX = MinX = MaxY = MinY = 0
    For i = 0 To LineCount - 1
        If MaxX < Lines(0, i) Then MaxX = Lines(0, i)
        If MaxX < Lines(2, i) Then MaxX = Lines(2, i)
        If MinX > Lines(0, i) Then MinX = Lines(0, i)
        If MinX > Lines(2, i) Then MinX = Lines(2, i)
        If MaxY < Lines(1, i) Then MaxY = Lines(1, i)
        If MaxY < Lines(3, i) Then MaxY = Lines(3, i)
        If MinY > Lines(1, i) Then MinY = Lines(1, i)
        If MinY > Lines(3, i) Then MinY = Lines(3, i)
    Next
    DeltaX = MaxX - MinX
    DeltaY = MaxY - MinY
    If DeltaX = 0 Then DeltaX = 1
    If DeltaY = 0 Then DeltaY = 1
    MaxX = MinX
    MaxY = MinY
    If DeltaX > DeltaY Then
        StepX = (nPixelWidth - 2) / DeltaX
        StepY = (nPixelHeight - 2) / DeltaX
        OffsetX = 0
        OffsetY = (DeltaX - DeltaY) / 2
    Else
        StepX = (nPixelWidth - 2) / DeltaY
        StepY = (nPixelHeight - 2) / DeltaY
        OffsetX = (DeltaY - DeltaX) / 2
        OffsetY = 0
    End If
    For i = 0 To LineCount - 1
        Lines(0, i) = Round((Lines(0, i) - MaxX + OffsetX) * StepX, 0)
        If Lines(0, i) < 0 Then Lines(0, i) = 0
        If Lines(0, i) >= nPixelWidth - 2 Then Lines(0, i) = nPixelWidth - 3
        Lines(1, i) = Round((Lines(1, i) - MaxY + OffsetY) * StepY, 0)
        If Lines(1, i) < 0 Then Lines(1, i) = 0
        If Lines(1, i) >= nPixelHeight - 2 Then Lines(1, i) = nPixelHeight - 3
        Lines(2, i) = Round((Lines(2, i) - MinX + OffsetX) * StepX, 0)
        If Lines(2, i) < 0 Then Lines(2, i) = 0
        If Lines(2, i) >= nPixelWidth - 2 Then Lines(2, i) = nPixelWidth - 3
        Lines(3, i) = Round((Lines(3, i) - MinY + OffsetY) * StepY, 0)
        If Lines(3, i) < 0 Then Lines(3, i) = 0
        If Lines(3, i) >= nPixelHeight - 2 Then Lines(3, i) = nPixelHeight - 3
        CDGen_Line Lines(0, i) + X0 + 1, Lines(1, i) + Y0 + 1, Lines(2, i) + X0 + 1, Lines(3, i) + Y0 + 1
    Next
End Sub

Sub CDGen_Char(cChar, X0, Y0)
    ‘ 在指定坐标处生成指定字符的位图阵列
    CDGen_Reset
    Select Case cChar
    Case "0"
        CDGen_SetDirection -60                            ‘ 逆时针60度(相对于垂直线)
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 逆时针60度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 1.5                              ‘ 绘制1.5个单位
        CDGen_SetDirection -60                            ‘ 逆时针60度
        CDGen_FowardDraw 0.7                              ‘ 绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 顺时针120度
        CDGen_FowardDraw 0.7                              ‘ 绘制0.7个单位
        CDGen_Close 0                                     ‘ 封闭当前笔与第0笔(0开始)
    Case "1"
        CDGen_SetDirection -90                            ‘ 逆时针90度(相对于垂直线)
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
        CDGen_MoveToMiddle 0, 50                          ‘ 移动画笔的位置到第0笔(0开始)的50%处
        CDGen_SetDirection 90                             ‘ 逆时针90度
        CDGen_FowardDraw -1.4                             ‘ 反方向绘制1.4个单位
        CDGen_SetDirection 30                             ‘ 逆时针30度
        CDGen_FowardDraw 0.4                              ‘ 绘制0.4个单位
    Case "2"
        CDGen_SetDirection 45                             ‘ 顺时针45度(相对于垂直线)
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -120                           ‘ 逆时针120度
        CDGen_FowardDraw 0.4                              ‘ 绘制0.4个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.6                              ‘ 绘制0.6个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 1.6                              ‘ 绘制1.6个单位
        CDGen_SetDirection -135                           ‘ 逆时针135度
        CDGen_FowardDraw 1.0                              ‘ 绘制1.0个单位
    Case "3"
        CDGen_SetDirection -90                            ‘ 逆时针90度(相对于垂直线)
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection 135                            ‘ 顺时针135度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection -120                           ‘ 逆时针120度
        CDGen_FowardDraw 0.6                              ‘ 绘制0.6个单位
        CDGen_SetDirection 80                             ‘ 顺时针80度
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
    Case "4"
        CDGen_SetDirection 20                             ‘ 顺时针20度(相对于垂直线)
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection -110                           ‘ 逆时针110度
        CDGen_FowardDraw 1.2                              ‘ 绘制1.2个单位
        CDGen_MoveToMiddle 1, 60                          ‘ 移动画笔的位置到第1笔(0开始)的60%处
        CDGen_SetDirection 90                             ‘ 顺时针90度
        CDGen_FowardDraw 0.7                              ‘ 绘制0.7个单位
        CDGen_MoveCursor 2                                ‘ 移动画笔到第2笔(0开始)的开始处
        CDGen_FowardDraw -1.5                             ‘ 反方向绘制1.5个单位
    Case "5"
        CDGen_SetDirection 90                             ‘ 顺时针90度(相对于垂直线)
        CDGen_FowardDraw 1.0                              ‘ 绘制1.0个单位
        CDGen_SetDirection -90                            ‘ 逆时针90度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection -90                            ‘ 逆时针90度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection 30                             ‘ 顺时针30度
        CDGen_FowardDraw 0.4                              ‘ 绘制0.4个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.4                              ‘ 绘制0.4个单位
        CDGen_SetDirection 30                             ‘ 顺时针30度
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
    Case "6"
        CDGen_SetDirection -60                            ‘ 逆时针60度(相对于垂直线)
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 逆时针60度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 1.5                              ‘ 绘制1.5个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 0.7                              ‘ 绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
        CDGen_CloseToMiddle 2, 50                         ‘ 将当前画笔位置与第2笔(0开始)的50%处封闭
    Case "7"
        CDGen_SetDirection 180                            ‘ 顺时针180度(相对于垂直线)
        CDGen_FowardDraw 0.3                              ‘ 绘制0.3个单位
        CDGen_SetDirection 90                             ‘ 顺时针90度
        CDGen_FowardDraw 0.9                              ‘ 绘制0.9个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 1.3                              ‘ 绘制1.3个单位
    Case "8"
        CDGen_SetDirection -60                            ‘ 逆时针60度(相对于垂直线)
        CDGen_FowardDraw -0.8                             ‘ 反方向绘制0.8个单位
        CDGen_SetDirection -60                            ‘ 逆时针60度
        CDGen_FowardDraw -0.8                             ‘ 反方向绘制0.8个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection 110                            ‘ 顺时针110度
        CDGen_FowardDraw -1.5                             ‘ 反方向绘制1.5个单位
        CDGen_SetDirection -110                           ‘ 逆时针110度
        CDGen_FowardDraw 0.9                              ‘ 绘制0.9个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.8                              ‘ 绘制0.8个单位
        CDGen_SetDirection 60                             ‘ 顺时针60度
        CDGen_FowardDraw 0.9                              ‘ 绘制0.9个单位
        CDGen_SetDirection 70                             ‘ 顺时针70度
        CDGen_FowardDraw 1.5                                ‘ 绘制1.5个单位
        CDGen_Close 0                                     ‘ 封闭当前笔与第0笔(0开始)
    Case "9"
        CDGen_SetDirection 120                            ‘ 逆时针60度(相对于垂直线)
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 逆时针60度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 顺时针120度
        CDGen_FowardDraw -1.5                              ‘ 绘制1.5个单位
        CDGen_SetDirection -60                            ‘ 顺时针120度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 顺时针120度
        CDGen_FowardDraw -0.7                              ‘ 绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 顺时针120度
        CDGen_FowardDraw 0.5                              ‘ 绘制0.5个单位
        CDGen_CloseToMiddle 2, 50                         ‘ 将当前画笔位置与第2笔(0开始)的50%处封闭
    ‘ 以下为字母的矢量动作，有兴趣的可以继续
    Case "A"
        CDGen_SetDirection -(Rnd * 20 + 150)              ‘ 逆时针150-170度(相对于垂直线)
        CDGen_FowardDraw Rnd * 0.2 + 1.1                  ‘ 绘制1.1-1.3个单位
        CDGen_SetDirection Rnd * 20 + 140                 ‘ 顺时针140-160度
        CDGen_FowardDraw Rnd * 0.2 + 1.1                  ‘ 绘制1.1-1.3个单位
        CDGen_MoveToMiddle 0, 30                          ‘ 移动画笔的位置到第1笔(0开始)的30%处
        CDGen_CloseToMiddle 1, 70                         ‘ 将当前画笔位置与第1笔(0开始)的70%处封闭
    Case "B"
        CDGen_SetDirection -(Rnd * 20 + 50)               ‘ 逆时针50-70度(相对于垂直线)
        CDGen_FowardDraw Rnd * 0.4 + 0.8                  ‘ 绘制0.8-1.2个单位
        CDGen_SetDirection Rnd * 20 + 110                 ‘ 顺时针110-130度
        CDGen_FowardDraw Rnd * 0.2 + 0.6                  ‘ 绘制0.6-0.8个单位
        CDGen_SetDirection -(Rnd * 20 + 110)              ‘ 逆时针110-130度
        CDGen_FowardDraw Rnd * 0.2 + 0.6                  ‘ 绘制0.6-0.8个单位
        CDGen_SetDirection Rnd * 20 + 110                 ‘ 顺时针110-130度
        CDGen_FowardDraw Rnd * 0.4 + 0.8                  ‘ 绘制0.8-1.2个单位
        CDGen_Close 0                                     ‘ 封闭当前笔与第1笔(0开始)
    Case "C"
        CDGen_SetDirection -60                            ‘ 逆时针60度(相对于垂直线)
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection -60                            ‘ 逆时针60度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 1.5                              ‘ 绘制1.5个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw -0.7                             ‘ 反方向绘制0.7个单位
        CDGen_SetDirection 120                            ‘ 顺时针120度
        CDGen_FowardDraw 0.7                              ‘ 绘制0.7个单位
    End Select
    CDGen_Flush X0, Y0
End Sub

Sub CDGen_Blur()
    ‘ 对产生的位图进行柔化处理
    Dim i, j
    
    For j = 1 To nPixelHeight - 2
        For i = 1 To nCharCount * nPixelWidth - 2
            If Buf(j, i) = 0 Then
                If ((Buf(j, i - 1) Or Buf(j + 1, i)) And 1) <> 0 Then
                    ‘ 如果当前点是空白点，且上下左右四个点中有一个点是有色点，则该点做柔化处理
                    Buf(j, i) = 2
                End If
            End If
        Next
    Next
End Sub

Sub CDGen_NoisyDot()
    ‘ 对产生的位图进行噪点处理
    Dim i, j, NoisyDot, CurDot
    
    For j = 0 To nPixelHeight - 1
        For i = 0 To nCharCount * nPixelWidth - 1
            If Buf(j, i) <> 0 Then
                NoisyDot = Int(Rnd * Rnd * nMaxSaturation)
                Select Case nColorNoisyDotOdds
                Case 0
                    CurDot = nMaxSaturation
                Case 1
                    CurDot = 0
                Case Else
                    CurDot = NoisyDot
                End Select
                If Rnd < nColorNoisyDotOdds Then Buf(j, i) = CurDot Else Buf(j, i) = nMaxSaturation
            Else
                NoisyDot = Int(Rnd * nMaxSaturation)
                Select Case nBlankNoisyDotOdds
                Case 0
                    CurDot = 0
                Case 1
                    CurDot = nMaxSaturation
                Case Else
                    CurDot = NoisyDot
                End Select
                If Rnd < nBlankNoisyDotOdds Then Buf(j, i) = CurDot Else Buf(j, i) = 0
            End If
        Next
    Next
End Sub

Sub CDGen()
    ‘ 生成位图阵列
    Dim i, Ch
    
    DigtalStr = ""
    CDGen_Clear
    For i = 0 To nCharCount - 1
        Ch = Mid(cCharSet, Int(Rnd * Len(cCharSet)) + 1, 1)
        DigtalStr = DigtalStr + Ch
        CDGen_Char Ch, i * nPixelWidth, 0
    Next
    CDGen_Blur
    CDGen_NoisyDot
End Sub

Function HSBToRGB(vH, vS, vB)
    ‘ 将颜色值由HSB转换为RGB
    Dim aRGB(3), RGB1st, RGB2nd, RGB3rd
    Dim nH, nS, nB
    Dim lH, nF, nP, nQ, nT

    vH = (vH Mod 360)
    If vS > 100 Then
        vS = 100
    ElseIf vS < 0 Then
        vS = 0
    End If
    If vB > 100 Then
        vB = 100
    ElseIf vB < 0 Then
        vB = 0
    End If
    If vS > 0 Then
        nH = vH / 60
        nS = vS / 100
        nB = vB / 100
        lH = Int(nH)
        nF = nH - lH
        nP = nB * (1 - nS)
        nQ = nB * (1 - nS * nF)
        nT = nB * (1 - nS * (1 - nF))
        Select Case lH
        Case 0
            aRGB(0) = nB * 255
            aRGB(1) = nT * 255
            aRGB(2) = nP * 255
        Case 1
            aRGB(0) = nQ * 255
            aRGB(1) = nB * 255
            aRGB(2) = nP * 255
        Case 2
            aRGB(0) = nP * 255
            aRGB(1) = nB * 255        
            aRGB(2) = nT * 255
        Case 3
            aRGB(0) = nP * 255
            aRGB(1) = nQ * 255
            aRGB(2) = nB * 255
        Case 4
            aRGB(0) = nT * 255
            aRGB(1) = nP * 255
            aRGB(2) = nB * 255
        Case 5
            aRGB(0) = nB * 255
            aRGB(1) = nP * 255
            aRGB(2) = nQ * 255
        End Select            
    Else
        aRGB(0) = (vB * 255) / 100
        aRGB(1) = aRGB(0)
        aRGB(2) = aRGB(0)
    End If
    HSBToRGB = ChrB(Round(aRGB(2), 0)) & ChrB(Round(aRGB(1), 0)) & ChrB(Round(aRGB(0), 0))
End Function

Sub CreatValidCode(pSN)
    Dim i, j, CurColorHue
    
    ‘ 禁止缓存
    Response.Expires = -9999
    Response.AddHeader "pragma", "no-cache"
    Response.AddHeader "cache-ctrol", "no-cache"
    Response.ContentType = "image/bmp"
    
    Call CDGen
    Session(pSN) = DigtalStr    ‘记录入Session

    Dim PicWidth, PicHeight, FileSize, PicDataSize
    PicWidth = nCharCount * nPixelWidth
    PicHeight = nPixelHeight
    PicDataSize = PicWidth * PicHeight * 3
    FileSize = PicDataSize + 54

    ‘ 输出BMP文件信息头
    Response.BinaryWrite ChrB(66) & ChrB(77) & _
        ChrB(FileSize Mod 256) & ChrB((FileSize \ 256) Mod 256) & ChrB((FileSize \ 256 \ 256) Mod 256) & ChrB(FileSize \ 256 \ 256 \ 256) & _
        ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & _
        ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0)

    ‘ 输出BMP位图信息头
    Response.BinaryWrite ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) & _
        ChrB(PicWidth Mod 256) & ChrB((PicWidth \ 256) Mod 256) & ChrB((PicWidth \ 256 \ 256) Mod 256) & ChrB(PicWidth \ 256 \ 256 \ 256) & _
        ChrB(PicHeight Mod 256) & ChrB((PicHeight \ 256) Mod 256) & ChrB((PicHeight \ 256 \ 256) Mod 256) & ChrB(PicHeight \ 256 \ 256 \ 256) & _
        ChrB(1) & ChrB(0) & _
        ChrB(24) & ChrB(0) & _
        ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & _
        ChrB(PicDataSize Mod 256) & ChrB((PicDataSize \ 256) Mod 256) & ChrB((PicDataSize \ 256 \ 256) Mod 256) & ChrB(PicDataSize \ 256 \ 256 \ 256) & _
        ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & _
        ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & _
        ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & _
        ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)

    ‘ 逐点输出位图阵列
    If nColorHue = -1 Then
        CurColorHue = Int(Rnd * 360)
    ElseIf nColorHue = -2 Then
        CurColorHue = 0
    Else
        CurColorHue = nColorHue
    End If
    For j = 0 To nPixelHeight - 1
        For i = 0 To Len(DigtalStr) * nPixelWidth - 1
            If nColorHue = -2 Then
                Response.BinaryWrite HSBToRGB(CurColorHue, 0, 100 - Buf(nPixelHeight - 1 - j, i))
            Else
                Response.BinaryWrite HSBToRGB(CurColorHue, Buf(nPixelHeight - 1 - j, i), 100)
            End If
        Next
    Next
End Sub
%>