[Matplotlib-users] updating contours

[Slavin, Jonathan]

Do you think it's worthy of a bug report?  It's not clear to me that the
collections of the AxesSubplot should be considered as internal, though I
do think that QuadContourSet objects should have a remove method in the
same way that AxesImage and Line2D objects have.

Jon

On Tue, Oct 27, 2015 at 9:06 AM, Thomas Caswell <tcaswell at gmail.com> wrote:

> That is a bug in something...
>
> On Tue, Oct 27, 2015, 08:53 Slavin, Jonathan <jslavin at cfa.harvard.edu>
> wrote:
>
>> Tom,
>>
>> Do you mean something like:
>> cs = ax.contour(...)
>> .
>> .
>> .
>> cs.remove()
>> If so, that doesn't work:
>> AttributeError: QuadContourSet instance has no attribute 'remove'
>>
>> Jon
>>
>> On Tue, Oct 27, 2015 at 7:48 AM, Thomas Caswell <tcaswell at gmail.com>
>> wrote:
>>
>>> 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
>>>>>> ________________________________________________________
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Matplotlib-users mailing list
>>>>>> Matplotlib-users at python.org
>>>>>> https://mail.python.org/mailman/listinfo/matplotlib-users
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>> ________________________________________________________
>>>>
>>>> _______________________________________________
>>>> Matplotlib-users mailing list
>>>> Matplotlib-users at python.org
>>>> https://mail.python.org/mailman/listinfo/matplotlib-users
>>>>
>>>
>>
>>
>> --
>> ________________________________________________________
>> 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
>> ________________________________________________________
>>
>>


-- 
________________________________________________________
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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