Thanks, I had no idea what was meant by sub-pixel, starting from section 6 of your link will explain this and show the smoothed animation.
(By sub-pixel they mean more finely determining the endpoints of the lines on an arbitrary grid finer than the output pixels — NOT physical display sub-pixels.)
(By sub-pixel they mean more finely determining the endpoints of the lines on an arbitrary grid finer than the output pixels — NOT physical display sub-pixels.)