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

[Denis-Alexander E. <den...@gm...>]

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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>