🚀 go-pugleaf

In article <1993Jan11.014246.4735@drefla.mese.com> matt@drefla.mese.com (Matt  
Brandt) writes:
    *  I've been able to come up with a pretty good approximation
    *  of a circle using curveto . . .
<<<<<   stuff deteleted  >>>>>>
    *  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.
You can't get an accurate enough circle with only two curves.  You
need one curve per quadrant, and you draw four of them.  The ``magic
number'' for the circle is  0.555.  Here's an example which you
can hack to your needs.

            %!PS
            /R 288 def
            /M R 0.555 mul def
            306 396 translate
            R 0 moveto
            R M dup R dup 0 exch curveto
            M neg R dup neg M R neg 0 curveto
            R neg M neg dup R neg dup 0 exch curveto
            M R neg R M neg R 0 curveto
            closepath
            stroke

I cross posted this to comp.lang.postscript, because, as Eric Scott
pointed out, this topic is pure PostScript and only tangentially
NeXT related.


        ........  Henry