[Tutor] move forward in arbitrary direction

[Luke Paireepinart]

>
> Going by radians, 0.0*pi is pointing to the right, 0.5*pi is pointing
> down, 1.0*pi is pointing to the left, and 1.5*pi is pointing straight up.


uh, wouldn't pi/2 be pointing up?
Don't you set 0 radians to be the positive-x axis and then go
counter-clockwise?
Or does it not matter?
It seems like it would.
Thanks,
-Luke
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