Cardinal
========

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Cardinal points

```rust
let n = Cardinal::NorthEast;
assert_eq!(n.is_northern(), true);
assert_eq!(south.is_eastern(), false);
```

It is possible to add or substract an angle in D°:
```
let south = Cardinal::North + 180; // D°
assert_eq!(south, Cardinal::South);
assert_eq!(south.is_southern(), true);
assert_eq!(south.is_eastern(), false);
```

Value is rounded to lowest closest Cardinal
```rust
let south = Cardinal::North + 190; // D°
assert_eq!(south, Cardinal::South);
```

Build Cardinal from Angle in D°, we consider 0° as North

```rust
let n = Cardinal::from_angle(0);
assert_eq!(n.is_northern(), true);
assert_eq!(n.is_southern(), false);

let e = Cardinal::from_angle(90);
assert_eq!(e.is_eastern(), true);
```