Dear Mike,

thanks a lot for the information.

Best wishes,

Federico



Michael Droettboom wrote:
> Unfortunately, clip paths are not implemented for the Agg backend.  
> Other backends (Ps, Pdf, Svg) may work, but I haven't tried that in a 
> while.
>
> I've spent a few tries trying to come up with the magic Agg 
> incantation to make this work.  It's not really documented in Agg, but 
> it should theoretically be possible.  It would take someone probably 
> to dig through the Agg source code and figure it out.  Any volunteers? ;)
>
> Cheers,
> Mike
>
> Federico Milano wrote:
>> Dear All,
>>
>> I am a new user of python and of matplotlib, so, please excuse me if I
>> am asking a trivial question.
>>
>> I am trying to use the funciton imshow to plot a temperature map of the
>> voltage levels of an electrical grid.  After creating the grid data
>> using "meshgrid" and "griddata" functions, "imshow" works nicely and
>> fills up the whoe axes box.
>>
>> Since, I also have the border line of the electrical grid (in the form
>> of a closed polygon coordinates), my next step is to clip the
>> temperature map using this polygon as a patch.  Thus, I have created a
>> Path instance with the polygon coordinates, subsequently, a PathPatch
>> instance, say "patch".
>>
>> Finally, I call the imshow function using the Artist options
>> "clip_on=True" and "clip_path=patch".  I was expecting that imshow would
>> have filed up only the region inside the polygon, but imshow is still
>> mapping the full figure axis box, i.e., the plots with and without the
>> clip_path option are identical.
>>
>> What am I missing or doing wrong?
>>
>> Thank you very much in advance for any help,
>>
>> Best wishes,
>>
>> Federico
>>
>>
>>
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