Re: [Matplotlib-users] creating a path from multiple sets of xy coordinates (inner and outer outlines)

[Phil E. <pel...@gm...>]

If I understand your question fully, then yes it does.
Have a play, and let us know how you get on.

Best,

Phil

On 22 December 2014 at 11:15, Denis-Alexander Engemann <
den...@gm...> wrote:

> Thanks Phil,
>
> just to make sure I inderstand the logic of PathPatch. Does it cut out
> vertices / paths that are detected to be inside an outline as the star in
> this example?
>
> -Denis
>
>
> 2014-12-22 12:09 GMT+01:00 Phil Elson <pel...@gm...>:
>
>> Sorry its taken so long to get an answer, but essentially you want to
>> concatenate the outer coordinates with the inner ones (reversed) to
>> indicate that it is a hole. There is a pretty (simple) useful example that
>> I added a few years ago for demonstrating the use of paths for markers:
>> http://matplotlib.org/examples/pylab_examples/marker_path.html
>>
>> Constructing a patch from a path is as simple as (untested):
>>
>> import matplotlib.patches as mpatches
>> patch = mpatches.PathPatch(my_path, facecolor='red', edgecolor='yellow')
>> axes.add_patch(patch)
>>
>>
>> HTH,
>>
>> Phil
>>
>>
>> On 19 December 2014 at 23:01, Denis-Alexander Engemann <
>> den...@gm...> wrote:
>>
>>> Dear list,
>>>
>>> I would like to create a custom image clipping mask using patches. My
>>> constraint is that my patch is required to have an outer and multiple inner
>>> outlines.
>>> To provide an analogy, think of a mask used for disguise where you leave
>>> three holes, two for the eyes, one for the mouth.
>>> I have the xy coordinates for the 'head', and the xy coordinates for
>>> each of the holes that I don't want to be hidden by the ensuing clipping
>>> mask.
>>>
>>> What's the matplotlib way to construct my desired path + patch from that?
>>> Note, it's important in my case to use a patch object. What I need to do
>>> would not work by simply masking my image using a masked array.
>>>
>>> Any pointer would be highly appreciated --
>>> Denis
>>>
>>>
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>>
>