Drawing A Semi-Circle Line

Well here I am again, stumped. I've looked through API viewer and didn't even find an API that I thought would help. I need to draw a semi-circle line. It needs to be able to change the distance it goes, how high it goes, etc. Like the starting point would be the X1, the ending point would be the X2, and the highest point of the line would be the Y. Also, I need to be able to draw it ontop of a window of an external application (not anything at all todo with my project). Thank you for your time :)

Quote:

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I need to be able to draw it ontop of a window of an external application

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You mean you want to draw that semicircle to another app Form (DC)?
Or maybe regioning your Form to take the shape of the semicircle and then display it on top of the other window, at the same time the other app is being shown?

The second would be a better option for what i need, but i know that the first one is an easier method.

edit/bump: any method works... just sort of urgent ^^