setup.js

function now() {
	return new Date().getTime();
}

function stats() {
	diffs = Module.stats.diffs;
	diffs.push(now() - Module.stats.last);
	Module.stats.last = now();
	if (diffs.length > 20)
		diffs.shift()
	var avg = 0;
	for (var i in diffs)
		avg += diffs[i];
	avg /= diffs.length;
	$('#start').replaceWith('<span id="start">FPS: ' + avg + '</span>');
}

function start() {
	var args = ['64'];
	$(Module.boids_state).each(function(i, boid) {
		$(boid).each(function(j, val) {
			args.push('' + val);
		});
	});
	Module.arguments = args;
	Module.run();
	var context = $('canvas')[0].getContext('2d');
	context.fillStyle = "rgba(255, 255, 255, 0.08)";
	context.fillRect(0, 0, 640, 480);
	context.fillStyle = "rgb(0,0,0)";
	$(Module.boids_state).each(function(i, boid) {
		context.fillRect(boid[0], boid[1], 0.5, 0.5);
	});
	stats();
	setTimeout(start, 10);
};

var Module = { boids_state: [], stats: { diffs: [], last: now() } };
Module['noInitialRun'] = "No, thank you.";
print = function(output) { Module.boids_state = eval(output); };