Function jitter

docs/app/js/sanddance-app.js:139644–139649

(x, y, r)

    return true;
}
function jitter(x, y, r) {
    return [
        x + Math.sin(x + y) * r,
        y + Math.cos(x - y) * r
    ];
}
class Delaunay {
    static from(points, fx = pointX, fy = pointY, that) {
        return new Delaunay("length" in points ? flatArray(points, fx, fy, that) : Float64Array.from(flatIterable(points, fx, fy, that)));