Function distanceToExterior

Returns the distance from point a to the exterior of shape.

Example: Distance from point to rectangle

const distance = distanceToExterior(
 {x: 50, y: 50},
 {x: 100, y: 100, width: 20, height: 20}
);
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Example: Find closest shape to point

import {minIndex} from '../data/arrays.js';
const shapes = [ some shapes... ]; // Shapes to compare against
const pt = { x: 10, y: 10 };       // Comparison point
const distances = shapes.map(v => distanceToExterior(pt, v));
const closest = shapes[minIndex(...distances)];
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