On Mon, Apr 28, 2008 at 8:21 PM, Sunzen Wang <[EMAIL PROTECTED]> wrote:

>  > I feel it something to do with zooming in beyond the resolution of the
>  > underlying system (no evidence of this)
>  >
>  I have no idea of it. Could some masters  say something about it?

This is an old, long standing bug.  It definitely existed in the agg
backends in older versions of matplotlib, but I wasn't able to
reproduce it when I tried on the maintenance branch or the trunk, so I
don't know if some of Michaels changes have fixed it.  It has been a
while since I looked at it, but the basic problem is that as you zoom
repeatedly, the logical canvas size (outside the viewport) becomes so
large that some of the data is overflowing some of aggs
datastructures.  Michaels has done some work to cull points outside
the viewport at the backend level, so please see if you can reproduce
this on the svn trunk.

JDH

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