Annulus draw tool

[pllim]

Description

We need this for Imviz annulus support. This blocks:

• FEAT: Annulus draw tool for Imviz spacetelescope/jdaviz#2240

cc @dhomeier and @astrofrog

[pllim]

p.s. I am not good with the icon stuff, so if you have someone over at Glueviz that makes the proper icons, please feel free to replace the file directly on my branch or open a PR to this PR. Thanks!

[codecov]

Codecov Report

Patch coverage: 31.37% and project coverage change: -0.57 ⚠️

Comparison is base (8ec97fb) 89.96% compared to head (5149e4e) 89.40%.

❗ Current head 5149e4e differs from pull request most recent head f0fd367. Consider uploading reports for the commit f0fd367 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #356      +/-   ##
==========================================
- Coverage   89.96%   89.40%   -0.57%     
==========================================
  Files          86       86              
  Lines        4523     4567      +44     
==========================================
+ Hits         4069     4083      +14     
- Misses        454      484      +30     

Impacted Files	Coverage Δ
glue_jupyter/bqplot/common/tools.py	65.84% <31.37%> (-5.33%)	⬇️

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[astrofrog]

For some reason the icon looks strange for me when using it in the regular scatter viewer (I edited the tools to add this one in to test it out):

Do you see that too or does it work ok on your side?

UI-wise, I wonder whether after the first click to select, the user should be able to then continue moving the cursor to edit the inner radius? We don't have to add it here if it's a blocker since this tool isn't enabled by default but just something to think about for future and which might be helpful in jdaviz too.

[pllim]

icon looks strange

I am not surprised if it looks strange. I don't have time or interest to make pretty icon especially since Jdaviz uses its own icons anyway and we have a professional designer doing that for us. So, if you have a prettier version, please replace the one in this PR.

I wonder whether after the first click to select, the user should be able to then continue moving the cursor to edit the inner radius?

That could be a follow-up PR. Would be nice to be able to do that at draw time, yes, but I am just not sure what kind of click and when would be the most intuitive, so definitely need some iterations.

[astrofrog]

I have fixed the icon:

[astrofrog]

Thanks!