Primitive operations on Points

[Michael-F-Bryan]

I just noticed there isn't an impl for multiplying/dividing a Point<F> by F. Has this been left out on purpose?

My specific use case is creating a unit vector. My current code looks like this

let magnitude = other.dot(&other);
let unit_v = Point::new(other.x() / magnitude, other.y() / magnitude);

However it'd be nice if I could skip the Point::new() call and just do something like this:

let magnitude = other.dot(&other);
let unit_v = other / magnitude;

[urschrei]

I've implemented the same functionality you describe in a couple of places, and used Point interchangeably as a vector, although I don't feel great about it. We should probably just have a vector type – I'm already getting confused when I look at function signatures that are doing vector ops.

[Michael-F-Bryan]

That's a good point, although what's the difference between a Point and a Coordinate? My thoughts were that Point is actually a generic 2D vector, whereas Coordinate is a thing which has a x and y and denotes positions.

That said, Coordinate is essentially useless at the moment...

[urschrei]

Point is actually a generic 2D vector

Hmm. I think this depends on the model, but I'd consider points to represent an absolute position in space, without any other dimensions. Which also describes Coordinate, I realise. The Point / Coordinate distinction precedes my existence in rust-geo, but I know this question's come up before.

[frewsxcv]

That said, Coordinate is essentially useless at the moment...

For the record, there was some discussion here: #15

[michaelkirk]

This was addressed as part of https://github.com/georust/geo/pull/505/files#diff-c7745eb5b54b1f8ebb4ed8f0b180cf8ee4fe4f2a771539abd51167fae3a194bdR383