Geo-Game Tile Generation in JavaScript

tilegen.js

// still very rough
var enemyFactory = function(location) {
	var rand1 = Math.floor(Math.random()*10);
	var rand2 = Math.floor(Math.random()*10);
	var add = function(a, b) {return a+b;};
	var subtract = function(a ,b) {return a-b;};
	var op = [add, subtract];
	var r1 = Math.floor(Math.random()*2);
	var r2 = Math.floor(Math.random()*2);
	console.log("rand1", rand1);
	console.log("rand2", rand2);

	var sym = new esri.symbol.PictureMarkerSymbol('assets/images/enemy.png', 30, 30);


	var enemyMaker = function(x, y) {
		var e = esri.geometry.geographicToWebMercator(new esri.geometry.Point(x,y));
		var g = new esri.Graphic(e, sym);
		g.id = "enemy";
		g.attributes = {type: "simple", health: 2};
		map.graphics.add(g);
	};

	var gen = function(opNums) {
		for (var t=0; t < 5; t++) {
			var x = op[opNums[0]](location.coords.longitude, t/500);

			for (var j=0; j < 5; j++) {
				var y = op[opNums[1]](location.coords.latitude, j/500);
				enemyMaker(x, y);
			}
		}
	};
	gen([0,0]);
	gen([1,1]);
	gen([0,1]);
	gen([1,0]);
};