Draw transparent circle filled outside

Question

I have a mapview that I want to draw a circle on to focus on a given area. But i want the circle to be inverted. That is, instead of the inside of the circle being filled, i

Answer 1

Do as you would do to draw a normal circle but with complement location and complement radius. Like:

{0-Lat, (Long-180)%180, 20037508.34-Radius}