Function noise

assets/js/Motorcycle.js:14–17

var lerp = (a, b, t) => a + (b - a) * (1 - Math.cos(t * Math.PI)) / 2;
var noise = x => {
    x = x * 0.01 % 255;
    return lerp(perm[Math.floor(x)], perm[Math.ceil(x)], x - Math.floor(x));
}

var player = new function () {
    this.x = c.width / 2;