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.
Wakeup in the morning and kick the day in the teeth!! Or something like that.
"i don't want to write leak free code or most efficient code, like others traditional (so called expert) coders do."
August 17th, 2003, 08:58 AM
Thanks a lot.
Very helpful answer.
Click Here to Expand Forum to Full Width