Binaryworld - SetWindowShape - Create elliptical or rounded forms ... [ VB -> Forms & Controls ]

Private Type POINTAPI
  X As Long
  Y As Long
End Type
Private Type RECT
  Left As Long
  Top As Long
  Right As Long
  Bottom As Long
End Type

' Region API functins
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 CreatePolygonRgn Lib "gdi32" (lpPoint As POINTAPI, _
  ByVal nCount As Long, ByVal nPolyFillMode As Long) As Long
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 GetWindowRect Lib "user32" (ByVal hWnd As Long, _
  lpRect As RECT) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, _
  ByVal hRgn As Long, ByVal bRedraw As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As _
  Long

' modify the shape of a window
'
' This routine supports three values for SHAPE
'  0 = circle/ellipse, 1=rounded rect, 2=rhomb
'
' NOTES: You get best effects using borderless forms
'    Remember to provide alternative commands for
'    closing and moving the form

Sub SetWindowShape(ByVal hWnd As Long, ByVal Shape As Long)
  Dim lpRect As RECT
  Dim wi As Long, he As Long
  Dim hRgn As Long

  ' get the bounding rectangle's size
  GetWindowRect hWnd, lpRect
  wi = lpRect.Right - lpRect.Left
  he = lpRect.Bottom - lpRect.Top

  ' create a region
  Select Case Shape
    Case 0     ' circle/ellipse
      hRgn = CreateEllipticRgn(0, 0, wi, he)
    Case 1     ' rounded rectangle
      hRgn = CreateRoundRectRgn(0, 0, wi, he, 20, 20)
    Case 2     ' rhomb
      Dim lpPoints(3) As POINTAPI
      lpPoints(0).X = wi \ 2
      lpPoints(0).Y = 0
      lpPoints(1).X = 0
      lpPoints(1).Y = he \ 2
      lpPoints(2).X = wi \ 2
      lpPoints(2).Y = he
      lpPoints(3).X = wi
      lpPoints(3).Y = he \ 2
      hRgn = CreatePolygonRgn(lpPoints(0), 4, 1)
  End Select

  ' trim the window to the region
  SetWindowRgn hWnd, hRgn, True
  DeleteObject hRgn

End Sub

Private Sub Form_Load()
  'SetWindowShape Me.hWnd, 0
  SetWindowShape Me.hWnd, 1
End Sub