Agar Minimap

Minimap for Agar
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// ==UserScript==
// @name         Agar Minimap
// @namespace    http://your.homepage/
// @version      0.1
// @description  Minimap for Agar
// @author       agar_cheats
// @match        http://agar.io/
// @require      https://code.jquery.com/jquery-latest.js
// @run-at       document-start
// @grant        none
// ==/UserScript==

var observer = new MutationObserver(function(mutations) {
    for (var i = 0; i < mutations.length; i++) {
        if (/^http:\/\/agar\.io\/main_out\.js/.test(mutations[i].addedNodes[0].src)) {
            var scriptNode = mutations[i].addedNodes[0];
            httpRequest(scriptNode.src, handleResponse);
            try{
                document.head.removeChild(scriptNode);
            }catch(e){}
            observer.disconnect();
            break;
        }
    }    
});
observer.observe(document.head, {childList: true});

function httpRequest(source, callBack) {
    var request = new XMLHttpRequest();
    request.onload = function() {
        callBack(this.responseText);
    };
    request.onerror = function() {
        console.log("Response was null");
    };
    request.open("get", source, true);
    request.send();
}

function insertScript(script) {
    if (typeof jQuery === "undefined") {
        return setTimeout(insertScript, 0, script);
    }
    var scriptNode = document.createElement("script");
    scriptNode.innerHTML = script;
    document.head.appendChild(scriptNode);
}

function handleResponse(script) {
    script = script.replace(/(\r\n|\n|\r)/gm,"");
    script = addHooks(script);
    insertScript(script);
}

function addHooks(script) {
    var match = script.match(/1==(\w+)\.length&&\(/);
    var cells = match[1];
    match = script.match(/\w+\.width&&(\w+)\.drawImage\(\w+,\w+-\w+\.width-10,10\);/);
    split = script.split(match[0]);
    return split[0]+match[0]+'Draw('+match[1]+','+cells+');'+split[1];
}

function CenterOfMass(cells, prop){
    var n = 0;
    var d = 0;
    for (var i in cells){
        n += cells[i].size*cells[i].size * cells[i][prop];
        d += cells[i].size*cells[i].size;
    }
    return n/d;
}

var map = null;
var last = {'x':0, 'y':0, 'color':'#000000', 'size':200};

window.Draw = function(oc, cells) {
    var client_width = window.innerWidth, client_height = window.innerHeight;
    var board_size = 11180;
    
    map && oc.drawImage(map, client_width-map.width-10, client_height-map.height-10);
    map || (map = document.createElement("canvas"));
    var c = Math.min(150, .3 * client_height, .3 * client_width) / board_size;
    map.width = board_size * c;
    map.height = board_size * c;

    mc = map.getContext("2d");
    mc.scale(c, c);
    mc.globalAlpha = .2;
    mc.fillStyle = "#000000";
    mc.fillRect(0, 0, board_size, board_size);
    mc.globalAlpha = .4;
    mc.lineWidth = 200;
    mc.strokeStyle = "#000000";
    mc.strokeRect(0, 0, board_size, board_size);
    if (cells && cells[0]){
        last.x = CenterOfMass(cells,'x');
        last.y = CenterOfMass(cells,'y');
        last.size = 200;
        last.color = cells[0].color;
    }
    mc.beginPath();
    mc.arc(last.x, last.y, last.size, 0, 2 * Math.PI, false);
    mc.globalAlpha = .8;
    mc.fillStyle = last.color;
    mc.fill();
    mc.lineWidth = 70;
    mc.stroke();
}