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调用方法<img src="getcode.asp"><input name="vcode" type="input">
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在服务器验证的时候Session("GetCode") = Request.Form("vcode")
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文件GetCode.asp
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<%
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Const nMaxSaturation = 100 ' 最大色彩饱和度
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Const nBlankNoisyDotOdds = 0.2 ' 空白处噪点率
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Const nColorNoisyDotOdds = 0.1 ' 有色处噪点率
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Const nCharCount = 4 ' 产生的字符个数
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Const nPixelWidth = 20 ' 单个字符位图的宽度
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Const nPixelHeight = 20 ' 单个字符位图的高度
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Const nColorHue = 220 ' 显示验证码的色调(-1表示随机色调, -2表示灰度色调)
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Const nAngleRandom = 10 ' 角度随机量
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Const nLengthRandom = 10 ' 长度随机量(百分比)
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Const cCharSet = "0123456789"
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' 构成验证码的字符集
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' 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
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Dim Buf(), DigtalStr
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Dim Lines(), LineCount
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Dim CursorX, CursorY, DirX, DirY
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Randomize
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Call CreatValidCode("GetCode")
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Sub CDGen_Reset()
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' 复位矢量笔和环境变量
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LineCount = 0
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CursorX = 0
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CursorY = 0
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' 初始的光笔方向是垂直向下
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DirX = 0
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DirY = 1
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End Sub
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Sub CDGen_Clear()
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' 清空位图阵列
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Dim i, j
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ReDim Buf(nPixelHeight - 1, nCharCount * nPixelWidth - 1)
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For j = 0 To nPixelHeight - 1
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For i = 0 To nCharCount * nPixelWidth - 1
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Buf(j, i) = 0
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Next
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Next
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End Sub
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Sub CDGen_PSet(X, Y)
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' 在位图阵列上画点
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Buf(Y, X) = 1
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End Sub
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Sub CDGen_Line(X1, Y1, X2, Y2)
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' 在位图阵列上画线
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Dim DX, DY, DeltaT, i
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DX = X2 - X1
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DY = Y2 - Y1
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If Abs(DX) > Abs(DY) Then DeltaT = Abs(DX) Else DeltaT = Abs(DY)
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For i = 0 To DeltaT
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CDGen_PSet X1 + DX * i / DeltaT, Y1 + DY * i / DeltaT
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Next
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End Sub
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Sub CDGen_FowardDraw(nLength)
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' 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
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nLength = Sgn(nLength) * Abs(nLength) * (1 - nLengthRandom / 100 + Rnd * nLenghtRandom * 2 / 100)
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ReDim Preserve Lines(3, LineCount)
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Lines(0, LineCount) = CursorX
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Lines(1, LineCount) = CursorY
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CursorX = CursorX + DirX * nLength
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CursorY = CursorY + DirY * nLength
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Lines(2, LineCount) = CursorX
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Lines(3, LineCount) = CursorY
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LineCount = LineCount + 1
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End Sub
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Sub CDGen_SetDirection(nAngle)
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' 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
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Dim DX, DY
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nAngle = Sgn(nAngle) * (Abs(nAngle) - nAngleRandom + Rnd * nAngleRandom * 2) / 180 * 3.1415926
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DX = DirX
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DY = DirY
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DirX = DX * Cos(nAngle) - DY * Sin(nAngle)
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DirY = DX * Sin(nAngle) + DY * Cos(nAngle)
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End Sub
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Sub CDGen_MoveToMiddle(nActionIndex, nPercent)
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' 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
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Dim DeltaX, DeltaY
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DeltaX = Lines(2, nActionIndex) - Lines(0, nActionIndex)
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DeltaY = Lines(3, nActionIndex) - Lines(1, nActionIndex)
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CursorX = Lines(0, nActionIndex) + Sgn(DeltaX) * Abs(DeltaX) * nPercent / 100
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CursorY = Lines(1, nActionIndex) + Sgn(DeltaY) * Abs(DeltaY) * nPercent / 100
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End Sub
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Sub CDGen_MoveCursor(nActionIndex)
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' 将画笔光标移动到指定动作的起始点上
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CursorX = Lines(0, nActionIndex)
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CursorY = Lines(1, nActionIndex)
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End Sub
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Sub CDGen_Close(nActionIndex)
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' 将当前光笔位置与指定动作的起始点闭合并移动光笔
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ReDim Preserve Lines(3, LineCount)
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Lines(0, LineCount) = CursorX
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Lines(1, LineCount) = CursorY
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CursorX = Lines(0, nActionIndex)
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CursorY = Lines(1, nActionIndex)
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Lines(2, LineCount) = CursorX
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Lines(3, LineCount) = CursorY
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LineCount = LineCount + 1
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End Sub
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Sub CDGen_CloseToMiddle(nActionIndex, nPercent)
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' 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
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Dim DeltaX, DeltaY
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ReDim Preserve Lines(3, LineCount)
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Lines(0, LineCount) = CursorX
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Lines(1, LineCount) = CursorY
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DeltaX = Lines(2, nActionIndex) - Lines(0, nActionIndex)
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DeltaY = Lines(3, nActionIndex) - Lines(1, nActionIndex)
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CursorX = Lines(0, nActionIndex) + Sgn(DeltaX) * Abs(DeltaX) * nPercent / 100
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CursorY = Lines(1, nActionIndex) + Sgn(DeltaY) * Abs(DeltaY) * nPercent / 100
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Lines(2, LineCount) = CursorX
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Lines(3, LineCount) = CursorY
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LineCount = LineCount + 1
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End Sub
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Sub CDGen_Flush(X0, Y0)
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' 按照当前的画笔动作序列绘制位图点阵
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Dim MaxX, MinX, MaxY, MinY
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Dim DeltaX, DeltaY, StepX, StepY, OffsetX, OffsetY
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Dim i
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MaxX = MinX = MaxY = MinY = 0
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For i = 0 To LineCount - 1
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If MaxX < Lines(0, i) Then MaxX = Lines(0, i)
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If MaxX < Lines(2, i) Then MaxX = Lines(2, i)
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If MinX > Lines(0, i) Then MinX = Lines(0, i)
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If MinX > Lines(2, i) Then MinX = Lines(2, i)
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If MaxY < Lines(1, i) Then MaxY = Lines(1, i)
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If MaxY < Lines(3, i) Then MaxY = Lines(3, i)
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If MinY > Lines(1, i) Then MinY = Lines(1, i)
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If MinY > Lines(3, i) Then MinY = Lines(3, i)
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Next
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DeltaX = MaxX - MinX
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DeltaY = MaxY - MinY
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If DeltaX = 0 Then DeltaX = 1
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If DeltaY = 0 Then DeltaY = 1
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MaxX = MinX
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MaxY = MinY
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If DeltaX > DeltaY Then
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StepX = (nPixelWidth - 2) / DeltaX
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StepY = (nPixelHeight - 2) / DeltaX
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OffsetX = 0
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OffsetY = (DeltaX - DeltaY) / 2
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Else
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StepX = (nPixelWidth - 2) / DeltaY
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StepY = (nPixelHeight - 2) / DeltaY
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OffsetX = (DeltaY - DeltaX) / 2
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OffsetY = 0
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End If
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For i = 0 To LineCount - 1
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Lines(0, i) = Round((Lines(0, i) - MaxX + OffsetX) * StepX, 0)
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If Lines(0, i) < 0 Then Lines(0, i) = 0
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If Lines(0, i) >= nPixelWidth - 2 Then Lines(0, i) = nPixelWidth - 3
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Lines(1, i) = Round((Lines(1, i) - MaxY + OffsetY) * StepY, 0)
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If Lines(1, i) < 0 Then Lines(1, i) = 0
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If Lines(1, i) >= nPixelHeight - 2 Then Lines(1, i) = nPixelHeight - 3
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Lines(2, i) = Round((Lines(2, i) - MinX + OffsetX) * StepX, 0)
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If Lines(2, i) < 0 Then Lines(2, i) = 0
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If Lines(2, i) >= nPixelWidth - 2 Then Lines(2, i) = nPixelWidth - 3
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Lines(3, i) = Round((Lines(3, i) - MinY + OffsetY) * StepY, 0)
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If Lines(3, i) < 0 Then Lines(3, i) = 0
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If Lines(3, i) >= nPixelHeight - 2 Then Lines(3, i) = nPixelHeight - 3
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CDGen_Line Lines(0, i) + X0 + 1, Lines(1, i) + Y0 + 1, Lines(2, i) + X0 + 1, Lines(3, i) + Y0 + 1
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Next
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End Sub
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Sub CDGen_Char(cChar, X0, Y0)
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' 在指定坐标处生成指定字符的位图阵列
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CDGen_Reset
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Select Case cChar
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Case "0"
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CDGen_SetDirection -60 ' 逆时针60度(相对于垂直线)
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection -60 ' 逆时针60度
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw 1.5 ' 绘制1.5个单位
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CDGen_SetDirection -60 ' 逆时针60度
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CDGen_FowardDraw 0.7 ' 绘制0.7个单位
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CDGen_SetDirection -60 ' 顺时针120度
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CDGen_FowardDraw 0.7 ' 绘制0.7个单位
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CDGen_Close 0 ' 封闭当前笔与第0笔(0开始)
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Case "1"
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CDGen_SetDirection -90 ' 逆时针90度(相对于垂直线)
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CDGen_FowardDraw 0.5 ' 绘制0.5个单位
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CDGen_MoveToMiddle 0, 50 ' 移动画笔的位置到第0笔(0开始)的50%处
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CDGen_SetDirection 90 ' 逆时针90度
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CDGen_FowardDraw -1.4 ' 反方向绘制1.4个单位
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CDGen_SetDirection 30 ' 逆时针30度
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CDGen_FowardDraw 0.4 ' 绘制0.4个单位
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Case "2"
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CDGen_SetDirection 45 ' 顺时针45度(相对于垂直线)
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection -120 ' 逆时针120度
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CDGen_FowardDraw 0.4 ' 绘制0.4个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.6 ' 绘制0.6个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 1.6 ' 绘制1.6个单位
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CDGen_SetDirection -135 ' 逆时针135度
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CDGen_FowardDraw 1.0 ' 绘制1.0个单位
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Case "3"
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CDGen_SetDirection -90 ' 逆时针90度(相对于垂直线)
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection 135 ' 顺时针135度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection -120 ' 逆时针120度
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CDGen_FowardDraw 0.6 ' 绘制0.6个单位
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CDGen_SetDirection 80 ' 顺时针80度
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CDGen_FowardDraw 0.5 ' 绘制0.5个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.5 ' 绘制0.5个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.5 ' 绘制0.5个单位
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Case "4"
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CDGen_SetDirection 20 ' 顺时针20度(相对于垂直线)
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection -110 ' 逆时针110度
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CDGen_FowardDraw 1.2 ' 绘制1.2个单位
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CDGen_MoveToMiddle 1, 60 ' 移动画笔的位置到第1笔(0开始)的60%处
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CDGen_SetDirection 90 ' 顺时针90度
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CDGen_FowardDraw 0.7 ' 绘制0.7个单位
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CDGen_MoveCursor 2 ' 移动画笔到第2笔(0开始)的开始处
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CDGen_FowardDraw -1.5 ' 反方向绘制1.5个单位
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Case "5"
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CDGen_SetDirection 90 ' 顺时针90度(相对于垂直线)
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CDGen_FowardDraw 1.0 ' 绘制1.0个单位
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CDGen_SetDirection -90 ' 逆时针90度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection -90 ' 逆时针90度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection 30 ' 顺时针30度
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CDGen_FowardDraw 0.4 ' 绘制0.4个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.4 ' 绘制0.4个单位
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CDGen_SetDirection 30 ' 顺时针30度
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CDGen_FowardDraw 0.5 ' 绘制0.5个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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Case "6"
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CDGen_SetDirection -60 ' 逆时针60度(相对于垂直线)
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection -60 ' 逆时针60度
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw 1.5 ' 绘制1.5个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw 0.7 ' 绘制0.7个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw 0.5 ' 绘制0.5个单位
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CDGen_CloseToMiddle 2, 50 ' 将当前画笔位置与第2笔(0开始)的50%处封闭
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Case "7"
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CDGen_SetDirection 180 ' 顺时针180度(相对于垂直线)
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CDGen_FowardDraw 0.3 ' 绘制0.3个单位
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CDGen_SetDirection 90 ' 顺时针90度
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CDGen_FowardDraw 0.9 ' 绘制0.9个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw 1.3 ' 绘制1.3个单位
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Case "8"
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CDGen_SetDirection -60 ' 逆时针60度(相对于垂直线)
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CDGen_FowardDraw -0.8 ' 反方向绘制0.8个单位
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CDGen_SetDirection -60 ' 逆时针60度
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CDGen_FowardDraw -0.8 ' 反方向绘制0.8个单位
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CDGen_SetDirection 120 ' 顺时针120度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection 110 ' 顺时针110度
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CDGen_FowardDraw -1.5 ' 反方向绘制1.5个单位
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CDGen_SetDirection -110 ' 逆时针110度
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CDGen_FowardDraw 0.9 ' 绘制0.9个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.8 ' 绘制0.8个单位
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CDGen_SetDirection 60 ' 顺时针60度
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CDGen_FowardDraw 0.9 ' 绘制0.9个单位
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CDGen_SetDirection 70 ' 顺时针70度
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CDGen_FowardDraw 1.5 ' 绘制1.5个单位
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CDGen_Close 0 ' 封闭当前笔与第0笔(0开始)
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Case "9"
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CDGen_SetDirection 120 ' 逆时针60度(相对于垂直线)
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection -60 ' 逆时针60度
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection -60 ' 顺时针120度
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CDGen_FowardDraw -1.5 ' 绘制1.5个单位
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CDGen_SetDirection -60 ' 顺时针120度
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CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
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CDGen_SetDirection -60 ' 顺时针120度
![](/assets/blank.gif)
CDGen_FowardDraw -0.7 ' 绘制0.7个单位
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CDGen_SetDirection 120 ' 顺时针120度
![](/assets/blank.gif)
CDGen_FowardDraw 0.7 ' 反方向绘制0.7个单位
![](/assets/blank.gif)
CDGen_SetDirection -60 ' 顺时针120度
![](/assets/blank.gif)
CDGen_FowardDraw 0.5 ' 绘制0.5个单位
![](/assets/blank.gif)
CDGen_CloseToMiddle 2, 50 ' 将当前画笔位置与第2笔(0开始)的50%处封闭
![](/assets/blank.gif)
' 以下为字母的矢量动作,有兴趣的可以继续
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Case "A"
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CDGen_SetDirection -(Rnd * 20 + 150) ' 逆时针150-170度(相对于垂直线)
![](/assets/blank.gif)
CDGen_FowardDraw Rnd * 0.2 + 1.1 ' 绘制1.1-1.3个单位
![](/assets/blank.gif)
CDGen_SetDirection Rnd * 20 + 140 ' 顺时针140-160度
![](/assets/blank.gif)
CDGen_FowardDraw Rnd * 0.2 + 1.1 ' 绘制1.1-1.3个单位
![](/assets/blank.gif)
CDGen_MoveToMiddle 0, 30 ' 移动画笔的位置到第1笔(0开始)的30%处
![](/assets/blank.gif)
CDGen_CloseToMiddle 1, 70 ' 将当前画笔位置与第1笔(0开始)的70%处封闭
![](/assets/blank.gif)
Case "B"
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CDGen_SetDirection -(Rnd * 20 + 50) ' 逆时针50-70度(相对于垂直线)
![](/assets/blank.gif)
CDGen_FowardDraw Rnd * 0.4 + 0.8 ' 绘制0.8-1.2个单位
![](/assets/blank.gif)
CDGen_SetDirection Rnd * 20 + 110 ' 顺时针110-130度
![](/assets/blank.gif)
CDGen_FowardDraw Rnd * 0.2 + 0.6 ' 绘制0.6-0.8个单位
![](/assets/blank.gif)
CDGen_SetDirection -(Rnd * 20 + 110) ' 逆时针110-130度
![](/assets/blank.gif)
CDGen_FowardDraw Rnd * 0.2 + 0.6 ' 绘制0.6-0.8个单位
![](/assets/blank.gif)
CDGen_SetDirection Rnd * 20 + 110 ' 顺时针110-130度
![](/assets/blank.gif)
CDGen_FowardDraw Rnd * 0.4 + 0.8 ' 绘制0.8-1.2个单位
![](/assets/blank.gif)
CDGen_Close 0 ' 封闭当前笔与第1笔(0开始)
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Case "C"
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CDGen_SetDirection -60 ' 逆时针60度(相对于垂直线)
![](/assets/blank.gif)
CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
![](/assets/blank.gif)
CDGen_SetDirection -60 ' 逆时针60度
![](/assets/blank.gif)
CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
![](/assets/blank.gif)
CDGen_SetDirection 120 ' 顺时针120度
![](/assets/blank.gif)
CDGen_FowardDraw 1.5 ' 绘制1.5个单位
![](/assets/blank.gif)
CDGen_SetDirection 120 ' 顺时针120度
![](/assets/blank.gif)
CDGen_FowardDraw -0.7 ' 反方向绘制0.7个单位
![](/assets/blank.gif)
CDGen_SetDirection 120 ' 顺时针120度
![](/assets/blank.gif)
CDGen_FowardDraw 0.7 ' 绘制0.7个单位
![](/assets/blank.gif)
End Select
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CDGen_Flush X0, Y0
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End Sub
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Sub CDGen_Blur()
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' 对产生的位图进行柔化处理
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Dim i, j
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For j = 1 To nPixelHeight - 2
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For i = 1 To nCharCount * nPixelWidth - 2
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If Buf(j, i) = 0 Then
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If ((Buf(j, i - 1) Or Buf(j + 1, i)) And 1) <> 0 Then
![](/assets/blank.gif)
' 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
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Buf(j, i) = 2
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End If
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End If
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Next
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Next
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End Sub
![](/assets/blank.gif)
Sub CDGen_NoisyDot()
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' 对产生的位图进行噪点处理
![](/assets/blank.gif)
Dim i, j, NoisyDot, CurDot
![](/assets/blank.gif)
For j = 0 To nPixelHeight - 1
![](/assets/blank.gif)
For i = 0 To nCharCount * nPixelWidth - 1
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If Buf(j, i) <> 0 Then
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NoisyDot = Int(Rnd * Rnd * nMaxSaturation)
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Select Case nColorNoisyDotOdds
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Case 0
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CurDot = nMaxSaturation
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Case 1
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CurDot = 0
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Case Else
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CurDot = NoisyDot
![](/assets/blank.gif)
End Select
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If Rnd < nColorNoisyDotOdds Then Buf(j, i) = CurDot Else Buf(j, i) = nMaxSaturation
![](/assets/blank.gif)
Else
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NoisyDot = Int(Rnd * nMaxSaturation)
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Select Case nBlankNoisyDotOdds
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Case 0
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CurDot = 0
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Case 1
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CurDot = nMaxSaturation
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Case Else
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CurDot = NoisyDot
![](/assets/blank.gif)
End Select
![](/assets/blank.gif)
If Rnd < nBlankNoisyDotOdds Then Buf(j, i) = CurDot Else Buf(j, i) = 0
![](/assets/blank.gif)
End If
![](/assets/blank.gif)
Next
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Next
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End Sub
![](/assets/blank.gif)
Sub CDGen()
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' 生成位图阵列
![](/assets/blank.gif)
Dim i, Ch
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DigtalStr = ""
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CDGen_Clear
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For i = 0 To nCharCount - 1
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Ch = Mid(cCharSet, Int(Rnd * Len(cCharSet)) + 1, 1)
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DigtalStr = DigtalStr + Ch
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CDGen_Char Ch, i * nPixelWidth, 0
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Next
![](/assets/blank.gif)
CDGen_Blur
![](/assets/blank.gif)
CDGen_NoisyDot
![](/assets/blank.gif)
End Sub
![](/assets/blank.gif)
Function HSBToRGB(vH, vS, vB)
![](/assets/blank.gif)
' 将颜色值由HSB转换为RGB
![](/assets/blank.gif)
Dim aRGB(3), RGB1st, RGB2nd, RGB3rd
![](/assets/blank.gif)
Dim nH, nS, nB
![](/assets/blank.gif)
Dim lH, nF, nP, nQ, nT
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vH = (vH Mod 360)
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If vS > 100 Then
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vS = 100
![](/assets/blank.gif)
ElseIf vS < 0 Then
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vS = 0
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End If
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If vB > 100 Then
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vB = 100
![](/assets/blank.gif)
ElseIf vB < 0 Then
![](/assets/blank.gif)
vB = 0
![](/assets/blank.gif)
End If
![](/assets/blank.gif)
If vS > 0 Then
![](/assets/blank.gif)
nH = vH / 60
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nS = vS / 100
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nB = vB / 100
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lH = Int(nH)
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nF = nH - lH
![](/assets/blank.gif)
nP = nB * (1 - nS)
![](/assets/blank.gif)
nQ = nB * (1 - nS * nF)
![](/assets/blank.gif)
nT = nB * (1 - nS * (1 - nF))
![](/assets/blank.gif)
Select Case lH
![](/assets/blank.gif)
Case 0
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aRGB(0) = nB * 255
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aRGB(1) = nT * 255
![](/assets/blank.gif)
aRGB(2) = nP * 255
![](/assets/blank.gif)
Case 1
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aRGB(0) = nQ * 255
![](/assets/blank.gif)
aRGB(1) = nB * 255
![](/assets/blank.gif)
aRGB(2) = nP * 255
![](/assets/blank.gif)
Case 2
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aRGB(0) = nP * 255
![](/assets/blank.gif)
aRGB(1) = nB * 255
![](/assets/blank.gif)
aRGB(2) = nT * 255
![](/assets/blank.gif)
Case 3
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aRGB(0) = nP * 255
![](/assets/blank.gif)
aRGB(1) = nQ * 255
![](/assets/blank.gif)
aRGB(2) = nB * 255
![](/assets/blank.gif)
Case 4
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aRGB(0) = nT * 255
![](/assets/blank.gif)
aRGB(1) = nP * 255
![](/assets/blank.gif)
aRGB(2) = nB * 255
![](/assets/blank.gif)
Case 5
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aRGB(0) = nB * 255
![](/assets/blank.gif)
aRGB(1) = nP * 255
![](/assets/blank.gif)
aRGB(2) = nQ * 255
![](/assets/blank.gif)
End Select
![](/assets/blank.gif)
Else
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aRGB(0) = (vB * 255) / 100
![](/assets/blank.gif)
aRGB(1) = aRGB(0)
![](/assets/blank.gif)
aRGB(2) = aRGB(0)
![](/assets/blank.gif)
End If
![](/assets/blank.gif)
HSBToRGB = ChrB(Round(aRGB(2), 0)) & ChrB(Round(aRGB(1), 0)) & ChrB(Round(aRGB(0), 0))
![](/assets/blank.gif)
End Function
![](/assets/blank.gif)
Sub CreatValidCode(pSN)
![](/assets/blank.gif)
Dim i, j, CurColorHue
![](/assets/blank.gif)
' 禁止缓存
![](/assets/blank.gif)
Response.Expires = -9999
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Response.AddHeader "pragma", "no-cache"
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Response.AddHeader "cache-ctrol", "no-cache"
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Response.ContentType = "image/bmp"
![](/assets/blank.gif)
Call CDGen
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Session(pSN) = DigtalStr '记录入Session
![](/assets/blank.gif)
Dim PicWidth, PicHeight, FileSize, PicDataSize
![](/assets/blank.gif)
PicWidth = nCharCount * nPixelWidth
![](/assets/blank.gif)
PicHeight = nPixelHeight
![](/assets/blank.gif)
PicDataSize = PicWidth * PicHeight * 3
![](/assets/blank.gif)
FileSize = PicDataSize + 54
![](/assets/blank.gif)
' 输出BMP文件信息头
![](/assets/blank.gif)
Response.BinaryWrite ChrB(66) & ChrB(77) & _
![](/assets/blank.gif)
ChrB(FileSize Mod 256) & ChrB((FileSize \ 256) Mod 256) & ChrB((FileSize \ 256 \ 256) Mod 256) & ChrB(FileSize \ 256 \ 256 \ 256) & _
![](/assets/blank.gif)
ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(54) & ChrB(0) & ChrB(0) & ChrB(0)
![](/assets/blank.gif)
' 输出BMP位图信息头
![](/assets/blank.gif)
Response.BinaryWrite ChrB(40) & ChrB(0) & ChrB(0) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(PicWidth Mod 256) & ChrB((PicWidth \ 256) Mod 256) & ChrB((PicWidth \ 256 \ 256) Mod 256) & ChrB(PicWidth \ 256 \ 256 \ 256) & _
![](/assets/blank.gif)
ChrB(PicHeight Mod 256) & ChrB((PicHeight \ 256) Mod 256) & ChrB((PicHeight \ 256 \ 256) Mod 256) & ChrB(PicHeight \ 256 \ 256 \ 256) & _
![](/assets/blank.gif)
ChrB(1) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(24) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(PicDataSize Mod 256) & ChrB((PicDataSize \ 256) Mod 256) & ChrB((PicDataSize \ 256 \ 256) Mod 256) & ChrB(PicDataSize \ 256 \ 256 \ 256) & _
![](/assets/blank.gif)
ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(18) & ChrB(11) & ChrB(0) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & _
![](/assets/blank.gif)
ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
![](/assets/blank.gif)
' 逐点输出位图阵列
![](/assets/blank.gif)
If nColorHue = -1 Then
![](/assets/blank.gif)
CurColorHue = Int(Rnd * 360)
![](/assets/blank.gif)
ElseIf nColorHue = -2 Then
![](/assets/blank.gif)
CurColorHue = 0
![](/assets/blank.gif)
Else
![](/assets/blank.gif)
CurColorHue = nColorHue
![](/assets/blank.gif)
End If
![](/assets/blank.gif)
For j = 0 To nPixelHeight - 1
![](/assets/blank.gif)
For i = 0 To Len(DigtalStr) * nPixelWidth - 1
![](/assets/blank.gif)
If nColorHue = -2 Then
![](/assets/blank.gif)
Response.BinaryWrite HSBToRGB(CurColorHue, 0, 100 - Buf(nPixelHeight - 1 - j, i))
![](/assets/blank.gif)
Else
![](/assets/blank.gif)
Response.BinaryWrite HSBToRGB(CurColorHue, Buf(nPixelHeight - 1 - j, i), 100)
![](/assets/blank.gif)
End If
![](/assets/blank.gif)
Next
![](/assets/blank.gif)
Next
![](/assets/blank.gif)
End Sub
%>
ASP程序调用验证码
http://www.cnblogs.com/studio313/archive/2006/12/11/588905.html