(PECL imagick 2.0.0)
ImagickDraw::circle — Draws a circle
$ox
   , float $oy
   , float $px
   , float $py
   )This function is currently not documented; only its argument list is available.
Draws a circle on the image.
ox
     origin x coordinate
oy
     origin y coordinate
px
     perimeter x coordinate
py
     perimeter y coordinate
No value is returned.