Creating Odd Shaped Forms
In order to create shaped Windows, you need to create some regions!
Public Declare Function CreateRectRgn _ Lib "gdi32" _ (ByVal X1 As Long, ByVal Y1 As Long, _ ByVal X2 As _ Long, ByVal Y2 As Long) As Long
This syntax creates a rectangular region with the upper left corner defined by X1, Y1 and the lower right corner defined by X2, Y2.
Public Declare Function CreateEllipticRgn _ Lib "gdi32" _ (ByVal X1 As Long, ByVal _ Y1 As Long, ByVal X2 As Long, _ ByVal Y2 As Long) As Long
This syntax creates an elliptic region that fits within the bounds specified by X1, Y1 and X2, Y2.
Create Rounded Rectangles
Public 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
This creates a rectangular region, like the CreateRectRgn. However, it allows you to round the corners, using the X3 and Y3 parameters. If set to 0, they produce square corners. If set at the width/height, they produce completely rounded corners.
Creating any Shape you Like
Public Declare Function CreatePolygonRgn _ Lib "gdi32" _ (lpPoint As POINTAPI, _ ByVal nCount As Long, ByVal _ nPolyFillMode As Long) As Long
This is function allows you to create any shaped region. The shape of it is limited
only by your patience to plug in numbers. To use this function, create an array of
POINTAPI structures. In the lpPoint parameter pass the first element in the array, and in
the nCount parameter, pass the number of points. The nPolyFillMode parameter determines
how the filled area of the region is selected. There are only subtle differences between
the two options (WINDING and ALTERNATE), but if you fiddle round, you may spot the
Windows automatically joins the first and last points to make a closed figure.
Creating Several Custom Shapes
Public Declare Function CreatePolyPolygonRgn _ Lib "gdi32" _ (lpPoint As POINTAPI, lpPolyCounts _ As Long, ByVal nCount As _ Long, ByVal nPolyFillMode As Long) As Long
As the name suggests, this function creates a region of several shapes. As before, the
lpPoint is the first element in an array of POINTAPIs, and nCount is the number of
elements. However, lpPolyCounts is the first element in an array of Longs. Each element in
this array defines how many points each polygon has. Therefore, the sum of all of the
elements of lpPolyCounts must equal nCount.
A similar effect can be achieved using several individual polygons, combined into one region.
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