www.pudn.com > DataCollectionSystem.rar > trans_colour.bas, change:2001-10-28,size:1937b

Attribute VB_Name = "trans_colour" 
Public Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long) As Long 
Public Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long 
Public Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long 
Public Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long 
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long 
Dim CurRgn, TempRgn As Long  ' Region variables 
Public Function AutoFormShape(bg As Form, transColor) 
    Dim X, Y As Integer 
    CurRgn = CreateRectRgn(0, 0, bg.ScaleWidth, bg.ScaleHeight)  ' Create base region which is the current whole window 
    While Y <= 5 ' Go through each column of pixels on form 
        While X <= bg.ScaleWidth  ' Go through each line of pixels on form 
            If GetPixel(bg.hdc, X, Y) = transColor Then  ' If the pixels color is the transparency color (bright purple is a good one to use) 
                TempRgn = CreateRectRgn(X, Y, X + 1, Y + 1)  ' Create a temporary pixel region for this pixel 
                success = CombineRgn(CurRgn, CurRgn, TempRgn, RGN_DIFF)  ' Combine temp pixel region with base region using RGN_DIFF to extract the pixel and make it transparent 
                DeleteObject (TempRgn)  ' Delete the temporary pixel region and clear up very important resources 
            End If 
            X = X + 1 
            Y = Y + 1 
            X = 0 
    success = SetWindowRgn(bg.hWnd, CurRgn, True)  ' Finally set the windows region to the final product 
    DeleteObject (CurRgn)  ' Delete the now un-needed base region and free resources 
    ' This code is by Chris Yates (1999) 
End Function