User-specified colormap in PointsDensity

[GuillaumeLeGoc]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
NA

What does this PR do?
Allows the user to specify a colormap for the points density feature.

References

#323

How has this PR been tested?

I ran examples/cell_density.py example,

brainrender/examples/cell_density.py

Line 42 in 980a76f

scene.add(PointsDensity(coordinates))

using scene.add(PointsDensity(coordinates, colors="inferno")) instead.

Is this a breaking change?

I hope not

Does this PR require an update to the documentation?

The PointsDensity is not documented in the documentation, so NA. We could add the colormap option in the example.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

Notes

I'm unfamiliar with (read : I don't know anything about) tests and pre-commits, so I didn't do those. I used ruff to format my addition in VSCode, but that's about it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (980a76f) 86.39% compared to head (9283ce8) 86.39%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #325   +/-   ##
=======================================
  Coverage   86.39%   86.39%           
=======================================
  Files          26       26           
  Lines        1213     1213           
=======================================
  Hits         1048     1048           
  Misses        165      165           

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[alessandrofelder]

Thanks @GuillaumeLeGoc !

Existing tests pass, and I have confirmed this works locally for me as expected too.
I don't think this critically needs a test right now (although it would be nice!) - happy to support you to learn about and write tests in the future though!

You're also right that we could improve the documentation further - it's on the list 😅