Function distanceFromExterior

distanceFromExterior(rect: Geometry.RectPositioned, pt: Geometry.Point): number
Returns the distance from the perimeter of rect to pt. If the point is within the rectangle, 0 is returned.

If rect does not have an x,y it's assumed to be 0,0
```
import { Rects } from "https://unpkg.com/ixfx/dist/geometry.js";
const rect = { width: 100, height: 100, x: 0, y: 0 };
Rects.distanceFromExterior(rect, { x: 20, y: 20 });
```
Parameters
- rect: Geometry.RectPositioned
  Rectangle
- pt: Geometry.Point
  Point
Returns number
Distance