Niveau d'un liquide avec contrôle shape

Bonjour,

Je viens de retrouver sur ma machine un petit bout de code qui, si je me rappelle bien, avait été écrit par Renfields :

Sur une Form :
- une picturebos nommée hublot
- une picturebox nommée Picture1
- un timer nommé Timer

Private Declare Function CreateEllipticRgn Lib "gdi32.dll" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function SelectClipRgn Lib "gdi32.dll" (ByVal hdc As Long, ByVal hRgn As Long) As Long
Private Declare Function DeleteObject Lib "gdi32.dll" (ByVal hObject As Long) As Long

Private Sub Form_Activate()
   Dim hRgn As Long
   With Me
     .ScaleMode = vbPixels
     .Move 0, 0, Screen.Width / 2, Screen.Height / 2
   End With
   With Picture1
     .ScaleMode = vbPixels
     .Move Me.ScaleWidth / 4, Me.ScaleHeight / 4, 200, 200
   End With
   With hublot
     .ScaleMode = vbPixels
     .BackColor = &HC0C0&
     .Move 10, 10, 100, 100
   End With
   Set hublot.Container = Picture1
   hublot.BackColor = vbYellow
   Timer1.Interval = 50
   Timer1.Enabled = True
   hRgn = CreateEllipticRgn(0, 0, hublot.ScaleWidth, hublot.ScaleHeight)
   SelectClipRgn hublot.hdc, hRgn
   DoEvents
   hublot.Line (0, 0)-(100, 100), vbWhite, BF
   DeleteObject hRgn
End Sub

Private Sub Timer1_Timer()
   Static nSize As Long
   nSize = nSize + 1
   If nSize = 100 Then
       hublot.Line (0, 0)-(100, 100), vbWhite, BF
       nSize = 0
   End If
   hublot.Line (0, (100 - nSize) * hublot.ScaleHeight / 100)-(hublot.ScaleWidth, hublot.ScaleHeight), vbBlue, BF
End Sub