Manually setting position.

[KupferudelWolf]

Great tool! However, it seems a bit difficult to repurpose this to follow the mouse (or otherwise manually set an X and Y position), at least from how it's currently built. Perhaps it would help to have a setX and setY function built into the magnifier object?

Additionally, from a UX perspective, it would make more sense for the viewfinder to focus on the point at its center, not its upper-left. I was able to quick-fix that by setting the element's "transform" to "translate" with the X and Y as -S/(Z*2); S as the width / height for X and Y (respectively), and Z as the zoom. I know there's more elegant ways, though.

[Cosmicore]

Additionally, from a UX perspective, it would make more sense for the viewfinder to focus on the point at its center, not its upper-left.

Did the exact same trick to move the lens focus to the center. Such option is very desirable in the tool itself.