itch.io

Note that pointer.pos means “wherever the mouse pointer is”, so if you move the pointer (for example, to click on a previous entry in the Listener to avoid having to retype the whole thing) then you’ll get a different result.

If nil is an operand of an arithmetic operator like subtraction it will be coerced to 0, but in this case it shouldn't make a difference.

I suspect the source of confusion here may be pointer.pos ; the fields of the pointer interface update every frame (at 60hz) to reflect the state of the pointing device, so if you moved your mouse or interacted with a touchscreen at all between evaluating those expressions you'll generally see a different value.

Ah, heck, I was so sure I hadn’t overlooked something that simple, but retrying again more carefully I think you’re both right. Looking at the timestamp of my post, that’s what I get for troubleshooting tired. 😬 Thanks both.