Re: [Matplotlib-users] Copying collections over to a new figure

Jae-Joon Lee wrote:
> Doing this in a general way is quite difficult (if possible) because a
> user can set an arbitrary transform for an artist. What we may try to
> do is recycling artists whose transform is simple, e.g., transData,
> rather than try to come up with a general solution.

Is even that worth the potential extra complexity, both in the code and 
in the documentation?  What is the real benefit?

Eric


> 
> I'll see what I can do but I must admit that I'm not very kin to this
> kind of feature and it may take a while. I recommend you to open a new
> ticket in the feature requests tracker hoping  that other developers
> or contributors can take a look.
> 
> http://sourceforge.net/tracker/?atid=560723&group_id=80706&func=browse
> 
> Regards,
> 
> -JJ
> 
> 
> 
> On Mon, Mar 29, 2010 at 1:54 PM, Thomas Robitaille
> <tho...@gm...> wrote:
>> Hi Jae-Joon,
>>
>> Thanks for your quick reply! Since for example LineCollections can be created independent of the Axes in which they are going to be plotted through the creation of a LineCollection instance, would it not be possible to have a method that allows one to retrieve an Axes-independent LineCollection from an Axes instance? (for example a get_collection method) This would then allow one to 'recycle' existing collections.
>>
>> Cheers,
>>
>> Thomas
>>
>> On Mar 29, 2010, at 1:40 PM, Jae-Joon Lee wrote:
>>
>>> As far as I can say, moving around artists from one axes to the other
>>> is NOT recommended. And I encourage you to create separate artists for
>>> each axes rather than try to reuse the existing ones.
>>>
>>> For your particular example,
>>>
>>> fig = mpl.figure()
>>> ax2 = fig.add_subplot(1,1,1)
>>> for c in ax1.collections:
>>>    c._transOffset=ax2.transData
>>>    ax2.add_collection(c)
>>>
>>> should work.
>>>
>>> Regards,
>>>
>>> -JJ
>>>
>>>
>>>
>>>
>>> On Mon, Mar 29, 2010 at 12:24 PM, Thomas Robitaille
>>> <tho...@gm...> wrote:
>>>> Hello,
>>>>
>>>> In the following example, I am trying to copy over existing collections from one plot to another:
>>>>
>>>> import matplotlib.pyplot as mpl
>>>>
>>>> fig = mpl.figure()
>>>> ax1 = fig.add_subplot(1,1,1)
>>>> ax1.scatter([0.5],[0.5])
>>>> fig.savefig('test1.png')
>>>>
>>>> fig = mpl.figure()
>>>> ax2 = fig.add_subplot(1,1,1)
>>>> for c in ax1.collections:
>>>>    ax2.add_collection(c)
>>>> fig.savefig('test2.png')
>>>>
>>>> However, the circle appears in the wrong place in test2.png (close to 0.4, 0.4 instead of 0.5,0.5). Is it not possible/safe to copy over collections in this way? If not, then how should this be done?
>>>>
>>>> Thanks,
>>>>
>>>> Thomas
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> 
> ------------------------------------------------------------------------------
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