[yt-dev] Issue with PlotWindow and Callbacks

[Matthew Turk]

Sure, it's done in restore_grid_state in yt/data_objects/data_containers.py.

I looked into this and it looks to me like the recreate frb function,
which calls this get_data_source_fields, is the problem.  Once the FRB
gets invalidated, it looks at this and gets them back.  PR #

Also, Nathan, what is the exception you're expecting to catch in the
naked try/except block there?

On Wed, Jul 11, 2012 at 10:19 PM, John ZuHone <jzuhone at gmail.com> wrote:
> Matt,
>
> Can you point to where this is done?
>
> John
>
> On Jul 12, 2012, at 1:06 AM, Matthew Turk wrote:
>
>> Hi Nathan and John,
>>
>> What if the quiver callback simply popped any newly generated fields
>> when it was done?  That's what we do for the grids when calculating
>> derived fields.
>>
>> -Matt
>>
>> On Wed, Jul 11, 2012 at 10:05 PM, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
>>> Hi John,
>>>
>>> I haven't tested the quiver callbacks yet and I'm not particularly surprised
>>> that they're a bit broken.
>>>
>>> Your list should probably be attached to every instance PWViewer so that it
>>> is accessible by the CallbackWrapper.  At line 638 you can set the fields to
>>> plot to be self._frb.data.keys() minus the fields included in your new list.
>>>
>>> It might be a bit tricky to generate the list since the callbacks are
>>> generated dynamically.  Maybe the thing to do is inspect
>>> self._frb.data.keys() before and after the callback is called inside
>>> PWViewerMPL._setup_plots() (line 689 in my version of plot_window.py).
>>>
>>> Please let us know if you run into any difficulties.
>>>
>>> Cheers,
>>>
>>> Nathan
>>>
>>>
>>> On 7/11/12 9:52 PM, John Zuhone wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I've found an issue with PlotWindow and callbacks. The example script I
>>>> have included adds velocity vectors on top of a slice:
>>>>
>>>> http://paste.yt-project.org/show/2544/
>>>>
>>>> Later on in the script, I try to resize the plot, but I get this error:
>>>>
>>>> http://paste.yt-project.org/show/2545/
>>>>
>>>> This is because the field list now includes x-velocity and y-velocity, but
>>>> there are not any plots corresponding to these fields in the list. I figure
>>>> that the answer to this is to retain some sort of field list that
>>>> corresponds to the fields that are actually being plotted in the colorscale,
>>>> but I figured before I just went in and dropped it in somewhere I'd ask for
>>>> opinions as to where it should go.
>>>>
>>>> Best,
>>>>
>>>> John Z
>>>>
>>>> --
>>>> John ZuHone
>>>>
>>>> Postdoctoral Researcher
>>>> NASA/Goddard Space Flight Center
>>>>
>>>> jzuhone at gmail.com <mailto:jzuhone at gmail.com>
>>>> john.zuhone at nasa.gov <mailto:john.zuhone at nasa.gov>
>>>>
>>>>
>>>>
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