[AstroPy] Aplpy FITSFigure does not open any window

[Thomas Robitaille]

Hi Vittorio,

Apologies for the delay - I think that these issues should be resolved with
the latest version of APLpy (2.0.3) but if not, please open an issue here:

https://github.com/aplpy/aplpy/issues

Thanks!
Tom

On Tue, 31 Oct 2017 at 18:29, Vittorio_Roma2 <vittorio.braga at roma2.infn.it>
wrote:

> Dear all
>
> I am having a problem with aplpy.
>
> I am using Python 3.5.2 under ubuntu 16.04 and installed aplpy version
> 1.1.1
>
> through pip3 install aplpy
>
>
> The first problem arises when importing aplpy:
>
>
> import/home/vittorio/.local/lib/python3.5/site-packages/matplotlib/cbook/deprecation.py:106:
>
> MatplotlibDeprecationWarning: The mpl_toolkits.axes_grid module was
> deprecated in version 2.1. Use mpl_toolkits.axes_grid1 and
> mpl_toolkits.axisartist provies the same functionality instead.
>    warnings.warn(message, mplDeprecation, stacklevel=1)
>
> I have tried to substitute mpl_toolkits.axes_grid1 with
> mpl_toolkits.axes_grid in core.py
>
> but then I got an error (and not a warning)  saying that axes_grid1 does
> not have some method.
>
> This will just return a failure and stop everything.
>
>
> Anyways, when I do
>
>  >>> fitsfile='somefile.fits'
>  >>> F=aplpy.FITSFigure(fitsfile)
> WARNING: Cannot determine equinox. Assuming J2000. [aplpy.wcs_util]
> WARNING: Cannot determine equinox. Assuming J2000. [aplpy.wcs_util]
>  >>> F.show_grayscale()
> INFO: Auto-setting vmin to  3.416e+03 [aplpy.core]
> INFO: Auto-setting vmax to  2.212e+04 [aplpy.core]
>
>
> No window at all is opening. I have also tried giving as input of
> FITSFIgure
> astropy.io.fits.open objects but again, no graphical window shows up.
>
> I have found some workaround, that is, after the above instructions, to
> give
>
>  >>>hdu_list=fits.open(fitsfile)
>  >>>image_data=hdu_list[0].data
>  >>>plt.imshow(image_data,'gray',clim=[4500,9000])
>  >>>plt.show(block=False)
>
> This does open an astrometrized image, with the labels of the X and Y axis
> in the right place. However, this does not allow me to use any of the
> FITSFigure methods. Neither I can add subplots to put annotations. Finally,
> to add markers, I am forced to do another workaround: to
> give pixel coordinates like this
>
>  >>>plt.scatter(pixcoords[:,0],pixcoords[:,1])
>
> where pixcoords comes from WCS transformations.
>
> I have also tried a workaround, giving,e.g.
>
>  >>>F.add_label(0.5,0.5,'ssss',relative=True)
>
> and do the plt.imshow and plt.show later, but this still does not work.
>
> To sum up, while it is true that  I can live with the workarounds for some
> very basic figures, all of this is slowing down the script and I can't call
> any of the FITSFigure methods
>
> Any help would really be appreciated
>
> Best regards, Vittorio
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>
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