Posted by Dusty

Two polygons. One overlays a large polygon over the entire screen, then carves a hole out of the center(when polygon coordinates overlap they invert, or in this case erase). Then another polygon that draws an image where the hole is cut out that represents the circle.

However if you think it allows you to draw overlapping circles you misunderstood. That can be achieved though with creative use of drawingpanel gui's, though:


Gotta be careful with darkness effects for mobile servers however, because of phone/tablet brightness and such even a slight darkness overlay can make it very hard to see.