Region Creation and Selection
An application creates a region by calling a function associated with a specific shape. The following table shows the function(s) associated with each of the standard shapes.
| Shape | Function |
|---|---|
| Rectangular region | CreateRectRgn, CreateRectRgnIndirect, SetRectRgn |
| Rectangular region with rounded corners | CreateRoundRectRgn |
| Elliptical region | CreateEllipticRgn, CreateEllipticRgnIndirect |
| Polygonal region | CreatePolygonRgn, CreatePolyPolygonRgn |
Each region creation function returns a handle that identifies the new region. An application can use this handle to select the region into a device context by calling the SelectObject function and supplying this handle as the second argument. After a region is selected into a device context, the application can perform various operations on it.
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