[Tyhm]

You just have to remember that in computer graphics everything is Quandrant 4 whereas in school everything is Quadrant 1.
2|1
-0-
3|4

Which is silly, as it's the only time I've seen things go counterclockwise from 90 degrees by way of definition.

And yeah, I was suggesting tinkering until it worked. That's the only way I've ever scripted anything - make a grandiose plan, find out it doesn't work, try adding and subtracting brackets and +1s until it kinda works, figure out why that helped, rescript it, repeat.