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Option Explicit
Dim lngCenter As Long
Dim lngMax As Long
Dim lngPad&
Dim PCurrent As POINT, PLast As POINT
Private Type POINT
x As Long
y As Long
End Type
Private Sub Form_Load()
lngCenter = (Picture1.Top + Picture1.Height) / 2
lngMax = Picture1.Height
PLast.x = 0
PLast.y = lngCenter

Dim i&
For i = 0 To Picture1.Width Step 100
Picture1.Line (i, 0)-(i, Picture1.Height), &HFFC0C0
Next

For i = 0 To Picture1.Height Step 100
Picture1.Line (0, i)-(Picture1.Width, i), &HFFC0C0
Next

Picture1.DrawWidth = 1.5
Picture1.Line (0, lngCenter)-(Picture1.Width, lngCenter), vbBlue
Picture1.DrawWidth = 1
End Sub
Private Sub Timer1_Timer()
PCurrent.x = PCurrent.x + 50

Randomize
PCurrent.y = Rnd * lngMax

Picture1.Line (PCurrent.x, PCurrent.y)-(PLast.x, PLast.y), vbRed
PLast.x = PCurrent.x
PLast.y = PCurrent.y
End Sub
Private Sub Command1_Click()
Timer1.Enabled = Not Timer1.Enabled
End Sub
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Private Function getRndY() As Integer
    Dim lngTmp%
   
    If intRnd = 0 Then
        Randomize
        intRnd = Rnd * 3 + 1
    End If
   
    Randomize
    lngTmp = Rnd * lngCenter
    If PLast.y > lngCenter Then
        getRndY = lngCenter + lngTmp
    Else
        getRndY = lngTmp
    End If
   
    intCurRnd = intCurRnd + 1
    If intCurRnd > intRnd Then
        Randomize
        intRnd = Rnd * 3 + 1
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