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Private Sub Form_Load()
t = 0
interval = 5
Pts(0).x = 0
Pts(0).y = 0
Dim r As rect
'内存dc准备
hdcMem = CreateCompatibleDC(0)
mBitmap = CreateCompatibleBitmap(GetDC(0), 800, 600) '光创建DC的话,没有大小,不能存(我是这么理解的)
SelectObject hdcMem, mBitmap
SetBkMode hdcMem, TRANSPARENT
SetRect r, 0, 0, 800, 600
FillRect hdcMem, r, 0
Randomize
End Sub
Private Sub Timer1_Timer()
rect.Bottom = 600
rect.Left = 0
rect.Right = 800
rect.Top = 0
data(icount Mod 20) = rnd()
ptlast.x = interval
If icount = 0 Then
ptlast.y = 0
ElseIf (icount Mod 20) = 0 Then
ptlast.y = data(19)
Else
ptlast.y = data((icount Mod 20) - 1)
End If
t = t + interval
ptnow.x = 0
ptnow.y = data(icount Mod 20)
icount = icount + 1
BitBlt hdcMem, 0, 0, 600, 800, Picture1.hdc, 0, 0, vbSrcCopy
Call Picture1.Cls
MoveToEx Picture1.hdc, ptlast.x, ptlast.y, Pts(3)
LineTo Picture1.hdc, ptnow.x, ptnow.y
BitBlt Picture1.hdc, interval + 1, 0, 600, 800, hdcMem, 0, 0, vbSrcCopy
End Sub