Click and drag menu

I want to create a menu that pops up when I hold down the mouse button and drag around the cursor like the one used in LoL:

http://riot-web-static.s3.amazonaws.com/images/news/March_2013/03_01_2013_-_smart_ping_announcement/Radial%20Menu_screen_EN.jpg

I already coded mouse logic and everything works fine, but right now I have nothing on screen. I really don’t know where to start since I’ve never worked with UI, so I was wondering if anyone could point me in the right direction

If you’re talking about how to draw the actual image to the screen, then I tend to add my actor to the HUDs list of PostRenderedActors via

AHUD::AddPostRenderedActor ( AHUD::AddPostRenderedActor | Unreal Engine Documentation)

And then override the native call back function in your actor:

AActor::PostRenderFor

There is also UMG which I haven’t used but seems nice.