Make OPoint call T::fmt to respect formatting modifiers

[kurtlawrence]

Invokes T::fmt rather than write!, which allows points to be formatted with modifiers like so:

let p = Point3::new(1.23, 3.45, 5.67);
assert_eq!(&format!("{p}"), "{1.23, 3.45, 5.67}");
assert_eq!(&format!("{p:.1}"), "{1.2, 3.5, 5.7}");
assert_eq!(&format!("{p:.0}"), "{1, 3, 6}");

I was not sure where to place the simple test code, it is currently adjacent in the file.

[Ralith]

Nice fix, thanks!

I was not sure where to place the simple test code, it is currently adjacent in the file.

Maybe tests/geometry/point.rs?

[kurtlawrence]

Good call, I've moved it there 🙂

[Ralith]

Thanks!