Сircle camera movement boundaries

[QiXi]

What could be improved

Add a circle bounding area to the camera

Why should this be improved

The circular map is popular in 2D top view games.

More information

or to do so to simplify this work

reference
If set, this determines boundaries for the camera movement. The camera will never move such that a region outside the world boundaries is shown, meaning it will stop following when the object gets close to the edges. Changing this value can immediately snap the camera if it is a wrong position, but other than that it's just prevent movement so should not add any non-smooth movement.
Rect? worldBounds;