[yt-users] Custom made annotations on a slice plot

[trobolo dinni]

Hi Nathan,

thank you very much, very clear explanation. Everything works fine.

At the moment I am a little busy to go into adding a new callback, but I
will take a look when I am done!

Cheers,
                Roberto




On 17 September 2013 13:44, Nathan Goldbaum <nathan12343 at gmail.com> wrote:

> Hi Roberto,
>
> All plot window plots (e.g. SlicePlot, ProjectionPlot and friends) expose
> the underlying matplotlib figure and axes like so:
>
> slc = SlicePlot(pf, 0, 'Density')
> plot = slc.plots['Density']
>
> # mpl figure
> fig = plot.figure
>
> # mpl axes
> ax = plot.axes
>
> Using these objects, you can call arbitrary matplotlib functions that hang
> off these objects.  For example:
>
> from matplotlib.patches import Ellipse
> el = Ellipse((0,0), .1, .2, angle=30, facecolor='none', edgecolor='black')
> ax.add_artist(Ellipse)
>
> Keep in mind that the coordinates I'm using for the Ellipse object are
> relative to the plot's coordinates (i.e. they will be in the same units as
> the x and y axis labels).
>
> If you're feeling adventurous, you could try adding a new plot callback
> that does this in general for any plot window plot.  The source code for
> the callbacks are in
> $YT_DEST/src/yt-hg/yt/visualization/plot_modifications.py.  You could
> compare with the CircleCallback.
>
> I've put together a notebook that demonstrates this.  You can view it
> here:
> http://nbviewer.ipython.org/url/hub.yt-project.org/notebooks/bcd7d3592d49496f84827abb86a738da.ipynb
>
> HTH,
>
> Nathan
>
>
> On Mon, Sep 16, 2013 at 6:51 PM, trobolo dinni <
> trobolo.trobolo.dinni5 at gmail.com> wrote:
>
>> Dear yt mailing list,
>>
>> I would like to ask a question about the annotations on the slice plots
>> since I was unable to find a solution or any clue about it in the mailing
>> list and the documentation.
>>
>> I selected an ellipsoid region of my simulation through the
>> "pf.h.ellipsoid" container, this region has particular properties and I
>> would like to highlight it in a density slice plot by by annotating the
>> contour of the ellipsoid (resulting in an image similar to those obtained
>> by annotating a sphere, but with the ellipse instead).
>>
>> Is there a way to achieve this result?
>>
>> Thanks,
>>                   Roberto
>>
>>
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>>
>
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