This seems like a simple question, but I don't seem to be able to find the right wording to find my answer anywhere.

How do I determine where an MC's center is relative to its edges?

I'm developing a tool that a variety of noobs (as if I'm not still a noob) will be using, and I don't trust them to keep art with 0,0 being the top left corner.

How do I figure out that the left edge is now at -111px, and the top at -52, and the right at 12, and the bottom at 334?

Or what if they draw it so the left edge is at 56px and the right edge at 583?


Essentially, I want to determine the center of my artwork, wherever it is relative to the center of the MC