Scalable Text

Users who make PNG exports at very high resolutions (e.g. for publication) run in to the issue that text font sizes are fixed and do not scale, leading to very tiny titles, labels, etc in the larger image. AFAIK units like rem, etc do not work on Canvas, but this should be verified. If not, it would be helpful to introduce our own unit that we manually scale according to canvas height.

Tangentially related to https://github.com/bokeh/bokeh/issues/6840

cc @bokeh/dev for thoughts, input.

[bryevdv]

It’s also not entirely clear to me that this approach would actually work even for one plot, at least without some changes. Looking just now the current output of canvas2svg specifies actual width and height attributes and CSS styles in the CVG tag itself. This presently makes scaling somewhat painful. It would probably be better or the output to specify a view box instead:

viewBox="0 0 900 400"

Changing that allows for actual responsive scaling of the SVGand I expect this is actually what people would like with an SVG output (both images below span my entire desktop):

(Perhaps a separate issue should be opened for view box)

Of course, people want this not only for exports but simply for real bokeh plots in responsive scenarios in browsers that can range widely in size, and none of this would help for that.

[birdsarah]

This would be a phenomenal feature. I had to make a special theme to make my publication plots look right.

That said, it wasn’t the biggest hurdle I faced in making publication plots and we could publish a theme that helps with this.