August 16th, 2003, 05:01 AM
GDI+ and RoundRect
I am translating some code from GDI to GDI+ and have not found RoundRect or something same. Is it so or I missed something?
August 16th, 2003, 06:12 AM
GDI provides several functions for creating regions: CreateRectRgn, CreateEllpticRgn, CreateRoundRectRgn, CreatePolygonRgn, and CreatePolyPolygonRgn. You might expect the Region class in GDI+ to have analogous constructors that take rectangles, ellipses, rounded rectangles, and polygons as arguments, but that is not the case. The Region class in GDI+ provides a constructor that receives a Rect object reference and another constructor that receives the address of a GraphicsPath object. If you want to construct a region based on an ellipse, rounded rectangle, or polygon, you can easily do so by creating a GraphicsPath object (that contains an ellipse, for example) and then passing the address of that GraphicsPath object to a Region constructor.
GDI+ makes it easy to form complex regions by combining shapes and paths. The Region class has Union and Intersect methods that you can use to augment an existing region with a path or another region. One nice feature of the GDI+ scheme is that a GraphicsPath object is not destroyed when it is passed as an argument to a Region constructor. In GDI, you can convert a path to a region with the PathToRegion function, but the path is destroyed in the process. Also, a GraphicsPath object is not destroyed when its address is passed as an argument to a Union or Intersect method, so you can use a given path as a building block for several separate regions. This is shown in the following example. Assume that onePath is a pointer to a GraphicsPath object (simple or complex) that has already been initialized.
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August 17th, 2003, 08:58 AM
Thanks a lot.
Very helpful answer.
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