Adding nexus attribute to force ploting in log scale

[mjdiff]

Is your feature request related to a problem?

The NXdata entry has attributes like axes and signal, whihc makes h5web automatically plot the 1D plot when the dataset is selected.

Requested solution or feature

Would it be possible for some NXdata to plot a 1D plot using a log scale as default instead of a linear scale?

Alternatives you've considered

Maybe adding an additional attribute to NXdata, like log_scale, could enforce this automatically.

[loichuder]

This can be done by using the SILX_style attribute. As the name suggests, it is not an official NeXus attribute but it is supported in silx and H5web.

For a semi-log in Y, the NXData needs an attribute SILX_style with the following value: {"signal_scale_type":"log"}.

For a log-log plot, the NXData needs an attribute SILX_style with the following value: {"signal_scale_type":"log", "axis_scale_type": ["log"]} (note that axis_scale_type is a list whose length corresponds to the number of axes).

You can find an example at https://h5web.panosc.eu/mock at the /nexus_entry/log_spectrum NXData group.

Note that these are only preferential settings, the user can still change the scale of the different axes at will.

[mjdiff]

This works perfectly. Thanks!

[loichuder]

Converted as a discussion since it can be useful for future reference