Just to confirm, I was doing some other random plotting of points (not
lines, just scatter points) today with axes=False, and once again this
cropped up - off by one pixel with the line x=0 and some points which
were definitely on that line, yet they weren't on it.  This was with
frames True or False.

So the problem is either that our points are all one pixel off from
the "real" axes, or that the axes are one pixel off from the points'
actual positions.  I personally think that it is drawing anything with
x or y coordinate zero one pixel off for some reason, but I can't
prove it.

Does this happen when we plot the points directly using matplotlib and
points generated by math.sin or whatever?

Incidentally, a little bit of the problem is that points can be an
even number of pixels in width, but the axes can be an odd number of
pixels in width.  But that is usually not as noticeable.

- kcrisman

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