can the co-ordinate system work like screenshots

[ofZach]

hi! I love this tool - super useful !! thanks for making it.

I was wondering if it's possible to change the coordinate system so the 0,0 position is the top left corner not the bottom left, so it's more similar to what you get when you hit command-shift-4 and you get a cross hairs with pixel position which has the top left as 0,0. the software I am working with (openframeworks / glfw) return its position which is accurate to the top left corner (and accurate relative to command shift-4) so it's just a bit of work to flip things around.

thanks again!