Implement scalar Point operations

[Netzwerk2]

Implement scalar operations similar to Vector. I saw there was a test which stated, that scalar multiplication should not compile. I decided to implement it anyway, because I don't really see a reason against it.

Addition of two points was also implemented.

Fixes #70

Note: This PR is based on #69, so it should be merged after #69 is merged.

[simonask]

Thank you for this!

The reason it wasn't implemented is that scaling a point doesn't make geometric sense. Perhaps translation (addition) does, though.

I'm wondering what your use case is here. :-)

(Don't mind the CI failures, it's a problem on the main branch, I'm fixing it.)

[Netzwerk2]

One of my use cases is calculating the center of a bounding box.

let center = 0.5 * bounds.min + 0.5 * bounds.max;

Another example would be calculating the vertex "center of mass" (i.e. the average of all vertices).

[simonask]

For bounding boxes, I would recommend using Box2<T>, which has a center() method doing basically that. (Looking at it I'm realizing it may not be optimal - it probably won't use fmuladd, that should be checked and fixed if so.)

Vertex average is interesting. I'm wondering if it makes sense to have specific functionality for it, but there don't seem to be any specific prior art in the ecosystem, and I'm guessing that a generic implementation may not be sufficient in many cases, like if you wanted a scaled or weighted average.

I think I've talked myself into this. :-)

[simonask]

#69 went in squashed and with a merge commit, so this may need rebasing. Sorry for the churn.

[Netzwerk2]

#69 went in squashed and with a merge commit, so this may need rebasing. Sorry for the churn.

No worries, I'll rebase it soon.

For bounding boxes, I would recommend using Box2, which has a center() method doing basically that.

I'm using 3D bounds. Box3<T> is currently missing a lot of functionality from the Box2<T>, including center(). I'll open another issue for that :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.31%. Comparing base (85e7da0) to head (1c51c8d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   99.30%   99.31%           
=======================================
  Files          22       22           
  Lines        5919     5946   +27     
=======================================
+ Hits         5878     5905   +27     
  Misses         41       41           

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[simonask]

Looks great, I'll add a CHANGELOG entry and merge ✨