HoleForm

Private Declare Function CreateRoundRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long, ByVal X3 As Long, ByVal Y3 As Long) As Long
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function CreateEllipticRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Long) As Long

'Funzione


Private Function fMakeATranspArea(AreaType As String, pCordinate() As Long) As Boolean
Const RGN_DIFF = 4
Dim lOriginalForm As Long
Dim ltheHole As Long
Dim lNewForm As Long
Dim lFwidth As Single
Dim lFHeight As Single
Dim lborder_width As Single
Dim ltitle_height As Single
On Error Goto Trap

lFwidth = ScaleX(Width, vbTwips, vbPixels)
lFHeight = ScaleY(Height, vbTwips, vbPixels)
lOriginalForm = CreateRectRgn(0, 0, lFwidth, lFHeight)
lborder_width = (lFHeight - ScaleWidth) / 2
ltitle_height = lFHeight - lborder_width - ScaleHeight

Select Case AreaType
Case "Elliptic"
ltheHole = CreateEllipticRgn(pCordinate(1), _
pCordinate(2), _
pCordinate(3), _
pCordinate(4))
Case "RectAngle"
ltheHole = CreateRectRgn(pCordinate(1), _
pCordinate(2), _
pCordinate(3), _
pCordinate(4))
Case "RoundRect"
ltheHole = CreateRoundRectRgn(pCordinate(1), _
pCordinate(2), _
pCordinate(3), _
pCordinate(4), _
pCordinate(5), _
pCordinate(6))
Case "Circle"
ltheHole = CreateRoundRectRgn(pCordinate(1), _
pCordinate(2), _
pCordinate(3), _
pCordinate(4), _
pCordinate(3), _
pCordinate(4))
Case Else
MsgBox "Unknown Shape!!"
Exit Function
End Select

lNewForm = CreateRectRgn(0, 0, 0, 0)
CombineRgn lNewForm, lOriginalForm, _
ltheHole, RGN_DIFF
SetWindowRgn hWnd, lNewForm, True
Me.Refresh
fMakeATranspArea = True
Exit Function
Trap:
MsgBox "error Occurred. Error # " & Err.Number & ", " & Err.Description
End Function

'come chiamarlo


Dim lParam(1 To 6) As Long
lParam(1) = 100
lParam(2) = 100
lParam(3) = 250
lParam(4) = 250
lParam(5) = 50
lParam(6) = 50
Call fMakeATranspArea("RoundRect", lParam())
'Call fMakeATranspArea("RectAngle", lParam())

'Call fMakeATranspArea("Circle", lParam())

'Call fMakeATranspArea("Elliptic", lParam())

Questo codice va inserito nelle dichiarazioni del Form
Se viene utilizzato un modulo ricordarsi di omettere la
stringa Private