[Matplotlib-users] updating contours

[Thomas Caswell]

Please don't do ax.collections.pop(), it is better to keep a reference to
the object returned by contour and then using its remove method.

The second way is safer as you will always remove the artist you think you
are removing and more future proof as the lists of artists (lines,
collections, ...) really should be considered internal details of mpl and
not accessed directly.

Tom

On Tue, Oct 27, 2015, 01:38 Slavin, Jonathan <jslavin at cfa.harvard.edu>
wrote:

> Hi Mike,
>
> Yes, that's basically what I ended up doing.  I did
> ax.collections.pop()
> ax.contour(...)
>
> I'm not sure if there's a different (better?) way to remove the contours,
> but that works.
>
> By the way, it was not easy to discover that contours are collections (a
> LineCollection), though I guess it's not too hard to guess.  I think the
> docs could provide more information along these lines.
>
> Jon
>
> On Mon, Oct 26, 2015 at 11:07 AM, Michael Droettboom <
> mdroettboom at continuum.io> wrote:
>
>> You're correct that there is no equivalent -- contour is one of those
>> "computed" things that can't be directly updated from the original data.
>> You don't need to do a whole `cla()` though.  Removing the contour artist
>> and calling contour again should be sufficient.
>>
>> Mike
>>
>> On Fri, Oct 23, 2015 at 11:56 AM, Slavin, Jonathan <
>> jslavin at cfa.harvard.edu> wrote:
>>
>>> Hi,
>>>
>>> I'm looking at a series of images and want to include overplotted
>>> contours.  To update the image I just need to use the set_data() method of
>>> the AxesImage object.  However, as far as I can tell, there's nothing
>>> similar for the QuadContourSet object.  I tried set_array() but that didn't
>>> work.  Am I missing something?  Does anyone have any suggestions for how to
>>> update the contours?  Of course if necessary I could do a cla(), but that
>>> would be slow, I think.
>>>
>>> Regards,
>>> Jon
>>> --
>>> ________________________________________________________
>>> Jonathan D. Slavin                 Harvard-Smithsonian CfA
>>> jslavin at cfa.harvard.edu       60 Garden Street, MS 83
>>> phone: (617) 496-7981       Cambridge, MA 02138-1516
>>> cell: (781) 363-0035             USA
>>> ________________________________________________________
>>>
>>>
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>>> Matplotlib-users mailing list
>>> Matplotlib-users at python.org
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>>>
>>>
>>
>>
>> --
>> Michael Droettboom
>> Continuum Analytics
>>
>
>
>
> --
> ________________________________________________________
> Jonathan D. Slavin                 Harvard-Smithsonian CfA
> jslavin at cfa.harvard.edu       60 Garden Street, MS 83
> phone: (617) 496-7981       Cambridge, MA 02138-1516
> cell: (781) 363-0035             USA
> ________________________________________________________
>
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> Matplotlib-users mailing list
> Matplotlib-users at python.org
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>
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