Option to make all fontsizes in your plot with the same scale larger (like in seaborn)

It would be great in Holoviews if you would have a nice, easy and fast way to make your plot more readable without having to specify every fontsize for every part of the plot separately.

Seaborn has the option to scale all your fontsizes (such as title, xlabel, ylabel, xticks etc) with the same factor, like this:

import seaborn as sns
sns.set(font_scale=2.0)

This will not set all fontsizes to the same size, but rather multiply every separate fontsize with the same factor.

Currently you have to do in Holoviews:

my_plot.opts(fontsize={'title': 20, 'yticks': 14, 'xticks': 14, 'xlabel': 16})

This is great if you want to define your plot precisely, but not if you want to rapidly change your plot.

(solution could be something like my_plot.opts(fontscale=2.0) or hv.output(fontscale=200), but these are just suggestions.)

[ahuang11]

Turns out it’s harder to implement than expected since holoviews doesn’t have the default fontsizes available in self (https://github.com/holoviz/holoviews/blob/master/holoviews/plotting/plot.py#L512 simply returns an empty dict if None) and I think to get the defaults, you need to either hardcode the defaults or render the figure and painstakingly retrieve the attributes (p.title.text_fontsize, p.xlabel.axis_label_text_font_size, etc) for multiple backends.

One workaround for bokeh is doing fontsize={'ticks': '200%', 'labels': '200%'}

[ahuang11]

I think we’ll probably have to do this sadly, each backend will have to implement a method that returns the defaults.

As in hardcode the defaults or render the plots each time to get the default?