Use arrow keys to move your cell!
// ==UserScript==
// @name Agar.io Arrow Keys
// @namespace https://greasyfork.org/en/users/46159-tom-burris2
// @version 0.4
// @description Use arrow keys to move your cell!
// @author Tom Burris
// @icon http://bit.ly/2oT4wRk
// @match *agar.io/*
// @grant none
// @compatible chrome
// @noframes
// ==/UserScript==
"use strict";
let down = 0;
const change = ({keyCode, type}) => {
let i = keyCode - 37;
let d = type === "keydown";
if (i >= 0 && i < 4) {
down = down & ~(1 << i) | d << i;
let xy = [innerWidth / 2, innerHeight / 2];
const min = Math.min(innerWidth, innerHeight);
for (let n = 0; n < 4; ++n) {
xy[n & 1] += (n < 2 ? -1 : 1) * min * (down >> n & 1);
}
canvas.dispatchEvent(new MouseEvent("mousemove", {
clientX: xy[0],
clientY: xy[1]
}));
}
};
addEventListener("keydown", change);
addEventListener("keyup", change);