Re: [Matplotlib-users] [matplotlib-devel] New flags in IPython, of interest to matplotlib users

[Paul K. <pki...@ni...>]

I'm curious about the term 'threading backend'.

Recently I posted a question about how to handle slow plots, suggesting
that the backend canvas have an isabort() method so that the renderer
can stop what it is doing and post the current bitmap as it stands.
This is to support interactive operations such as panning and resizing
on large data collections.

Do you mean something similar when you say 'threading backend', and is
it already supported in IPython?

  - Paul


On Wed, Dec 12, 2007 at 01:36:01AM -0700, Fernando Perez wrote:
> Hi all,
> 
> This was posted to the ipython-dev list, but since it's specifically
> for MPL, I figured the cross-list spam would be forgiven.
> 
> In IPython SVN, I just added the ability to manually control the pylab
> threading backend choice directly from the command line.  So for
> example if by default you have:
> 
> tlon[~]> ipython  -pylab --nobanner
> 
> In [1]: matplotlib.rcParams['backend']
> Out[1]: 'TkAgg'
> 
> You can now do this as well:
> 
> tlon[~]> ipython -wthread -pylab --nobanner
> 
> In [1]: matplotlib.rcParams['backend']
> Out[1]: 'WXAgg'
> 
> In [2]:
> Closing threads... Done.
> tlon[~]> ipython -gthread -pylab --nobanner
> 
> In [1]: matplotlib.rcParams['backend']
> Out[1]: 'GTKAgg'
> 
> The feature is fairly simplistic: the -Xthread flags map automatically
> to the XAgg backends in MPL, with no more fine-grained choice than
> that.  We can later look into allowing explicit backend selection if
> you really scream for it, but I'd rather keep this simple. This means
> that if you don't have the *Agg builds of the GUI backends, you'll
> still need to do the backend selection by hand as before (i.e. by
> modifying your mpl config file).
> 
> This has often been requested and I'd needed it myself on multiple
> occasions, so it's finally in.
> 
> Cheers,
> 
> f
> 
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