Re: [Matplotlib-users] Plotting single marker point at zoomed level

[John H. <jd...@gm...>]

On Mon, May 26, 2008 at 7:01 AM, New2Python <new...@li...> wrote:

> I hope someone can give me a simple solution to my problem. I have a line
> plotted and I need to be able to mark selected data points on the line. I am

If you are frequently changing the zoom level, as it looks like you
are, the copy background/restore region/blit idiom is probably not the
right one for you, since the background is assumed fixed.  You can
simply force a draw at any time by doing fig.canvas.draw() w/o having
to zoom out or resize to trigger a draw.  So after doing the
self.marker.set_data call, I would do fig.canvas.draw

If you have a lot of data and only a little in the viewport and
efficiency is a concern, you can use a "clipped line" class, as in the
example http://matplotlib.sf.net/examples/clippedline.py

Let me know if this helps,
JDH