Closest point

[Michael-F-Bryan]

The initial implementation of a ClosestPoint algorithm. The trait itself looks something like this:

pub trait ClosestPoint<F: Float, Rhs = Point<F>> {
    fn closest_point(&self, other: &Rhs) -> Closest<F>;
}

pub enum Closest<F: Float> {
    Intersection(Point<F>),
    SinglePoint(Point<F>),
    Indeterminate,
}

If you can think of a better name for Closest please let me know (names are hard!).

(fixes #161)

[Michael-F-Bryan]

I've finished off most of the ClosestPoint impls where the right hand side is a Point. Luckily I was able to find a generic way to do things early on, so that eliminated loads of boilerplate.

[frewsxcv]

looks great!

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push