🚀 go-pugleaf

I've been able to come up with a pretty good approximation of a circle
using curveto that works like this:

	x y rad 0 180 arc

is approximately equivalent to:

	x-rad y x-rad y+2*rad/3 x+rad y+2*rad/3 x+rad y curveto

of course, you can repeat for the bottom of the circle. Like I said though,
this is only an approximation. Does anybody out there have a better  
approximation of circle drawing using curveto? I need to do it this way for  
bizarre reasons and I would like to improve the accuracy a little bit.

matt