Points + Line are difficult to see in dark mode.

[NAThompson]

Describe the bug

In H5Web, it can be challenging to see points in dark mode.

And the "Points + Line" mode also makes it difficult to see the Points:

I propose making the points a different color than the lines, and making them bigger by default. Using the attached patchfile, I was able to make the above look like:

Of course these are all aesthetic questions, but I believe that the diff is a Pareto improvement.

glyph-colors.patch

[axelboc]

We actually support changing the shape and size of the points in the library; not to mention the thickness of the line. Now that we have the Aspect menu, we could perhaps surface these options in the viewer?

I'm not super keen on adding three separate radio groups to cover all possibilities; I'd much prefer a single group with smarter options to avoid cluttering the menu. What about an "Accessibility" group with three options (exact values to be tested)?

• Normal: 6px crosses, 1px line (i.e. same as now)
• Better: 9px circles, 1px line
• Best: 12px squares, 2px line

Note that I'm not in favour of rendering the points in a different colour from the line, as the colour is already used to differentiate multiple signals from one another on the NeXus visualization.

As always, thanks a lot for your feedback @NAThompson!