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Makes hole in Form

by Raven (2 Submissions)
Category: Graphics
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Thu 22^nd May 2003
Date Added: Mon 8^th February 2021
Rating: (1 Votes)

Makes hole in Form

API Declarations


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

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



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