Legend Formatting Issue

[Sravz-Solv]

I am trying overlay data from about 40 different sensors in a single overlay plot. But with my current plot length and width settings, I cannot see all the entries in the legend, there by limiting all legend interactivity. Is there a way around this issue like dividing the legend into multiple columns or just ability to scroll through legend entries ?

[poplarShift]

Not sure if there's a nice way of doing it in pure holoviews (I could think of some ugly hacks but they'd probably be very inefficient), but this sounds like a case for panel.

[Sravz-Solv]

How do you think panel would help with this issue?

[poplarShift]

You could build a widget to select and mute the lines you'd like.

For styling of the bokeh legend, that is likely an upstream issue, see here: bokeh/bokeh#3880

[Sravz-Solv]

gotcha. Thanks for the quick response.

Quick tag along question then.. Can panel be used through pycharm or is it only compatible with jupyter notebook ?

[poplarShift]

Hm, you should look for that over in the panel repo (or ask in the gitter channel), I don't know.

Also, if you would really like to try and hack something together in pure holoviews, here's a start, but the DataLink isn't working yet, don't know on the fly why not.

from holoviews.plotting.links import DataLink

obj = hv.Overlay([hv.Curve(np.random.rand(10,2), label='entry'+str(i)) for i in range(40)]).opts(
    opts.Curve(show_legend=True, width=400), opts.Overlay(show_legend=False),
)

leg = obj.clone().map(lambda x: x.iloc[:0], hv.Curve).opts(
    opts.Curve(width=200, height=800, xaxis=None, yaxis=None, show_frame=False),
    opts.Overlay(legend_position='right', show_legend=True), 
)
DataLink(obj, leg)
obj+leg

[geoHeil]

Has this been solved? Is there a better way more than a year later? I am facing the same problem. http://holoviews.org/user_guide/Customizing_Plots.html#Legend-customization shows that:

overlay.opts(legend_muted=True, legend_cols=2)

should work. However, for me only the legend_muted is accepted. Specifying any legend_cols is not changing the layout.

[tom-andersson]

Bump. Having a similar problem as @geoHeil with the legend_cols parameter with holoviews 1.14.4. In fact, specifying any legend_cols value turns the legend into a single row. What's going on here?

[maximlt]

Bokeh doesn't yet offer the possibility to control the legend layout (bokeh/bokeh#3880). For sure, as soon as this is added to Bokeh this will supported by HoloViews!

[TheoMathurin]

I think this may be closed? Through #5669.

[hoxbro]

You are right. Thank you for reporting this 👍