(PECL ps >= 1.1.0)
ps_circle — Draws a circle
$psdoc
   , float $x
   , float $y
   , float $radius
   )
   Draws a circle with its middle point at (x,
   y). The circle starts and ends at position
   (x+radius,
   y). If this function is called outside a path it
   will start a new path. If it is called within a path it will add the circle
   as a subpath. If the last drawing operation does not end in point
   (x+radius,
   y) then there will be a gap in the path.
   
psdocResource identifier of the postscript file as returned by ps_new().
xThe x-coordinate of the circle's middle point.
yThe y-coordinate of the circle's middle point.
radiusThe radius of the circle
   Returns TRUE on success or FALSE on failure.