Selection helper
I originally had added this as a comment to #739 but it felt a bit too off topic. Hence now in a separate issue.
I've been working on a simple selection helper (mimicking the implementation of the TransformGizmo) for another project. It needs a bit of cleaning-up but I thought something like this might be nice to have in pygfx itself - even if just as demo for how to do it. Would you consider a PR?
https://github.com/pygfx/pygfx/assets/7161148/5021cedd-9bb8-40bd-b058-02caa8ead356
This looks very nice! Curious to see how you implemented it, in fastplotlib we'll also be working on more selection tools soon.
Also interested to see how you made dendrograms, we want to have them with heatmaps: https://github.com/fastplotlib/fastplotlib/issues/167
Very nice! I can definitely see this as an example. And we can also consider moving (some of) it as a helper class in pygfx.