David Walsh Blog

MooTools, Mario, and Portal

I’m a big fan of video games. I don’t get much time to play them but I’ll put down the MacBook Pro long enough to get a few games in. One of my favorites is Portal. For those who don’t know, what’s wrong with you? Portal is a strategic game that requires a lot of thinking and good timing. You get two “portal guns” which allow you to get from place to place. Check out some gameplay here.

While Portal now has a place in my heart, it needs to share space with the original Mario games. Don’t ask me why, but I got the idea of combining the two in my head. And I’m not a video game programmer so I needed to rock MooTools to accomplish it. It was actually quite simple.


<!-- LIGHTS and CAMERA -->
<div id="stage">
	<!-- LEFT TUBE -->
	<img id="tube-left" src="mario-pipe.png" alt="Left Pipe" />
	<!-- RIGHT TUBE -->
	<img id="tube-right" src="mario-pipe.png" alt="Right Pipe" />
	<!-- LEFT MARIO -->
	<img id="mario-left" src="mario-left.png" alt="Mario!" />
	<!-- RIGHT MARIO -->
	<img id="mario-right" src="mario-right.png" alt="Mario!" />
	<!-- FLOOR -->
	<div id="floor"></div>

Just a stage and some imagery which will be manipulated with CSS and MooTools JavaScript.


#stage		{ width:600px; height:250px; position:relative; background:#5573EB; }
#stage img	{ display:block; }
#tube-left	{ position:absolute; bottom:0; left:100px; z-index:5; }
#tube-right	{ position:absolute; bottom:0; right:100px; z-index:5; }
#mario-left	{ position:absolute; bottom:0; left:110px; z-index:3; }
#mario-right { position:absolute; bottom:0; right:110px; z-index:3; }
#baddy		{ position:absolute; bottom:30px; left:180px; z-index:5; }
#box		{ position:absolute; bottom:130px; left:290px; z-index:5; }
#floor		{ position:absolute; bottom:0; left:0; height:30px; width:600px; background:url(mario-floor.png) 0 0; right:0; }

The absolute positioning is key here. The hardest part is measuring things up — once you’ve got that, you’re golden. Also be sure that the pipes have a larger z-index than the Marios.

The MooTools JavaScript

(function($) {
	window.addEvent('domready',function() {
		/* the master */
		var animation = function() {
			/* settings */
			var upDuration = 300, downDuration = 500, upHeight = 200, baddyDuration = 10000, rightDistance = 400;
			var lefty = $('mario-left'), righty = $('mario-right'), baddy = $('baddy');
			/* left animations time! */
			var leftFxUp = new Fx.Tween(lefty,{
				duration: upDuration,
				onComplete: function() { leftFxDown.start('bottom',0); }
			var leftFxDown = new Fx.Tween(lefty,{
				duration: downDuration,
				onComplete: function() { rightFxUp.start('bottom',upHeight); }
			/* right animation time! */
			var rightFxUp = new Fx.Tween(righty,{
				duration: upDuration,
				onComplete: function() { rightFxDown.start('bottom',0); }
			var rightFxDown = new Fx.Tween(righty,{
				duration: downDuration,
				onComplete: function() { leftFxUp.start('bottom',upHeight); }
			/* baddy animation */
			var baddyRightFx = new Fx.Tween(baddy,{
				duration: baddyDuration,
				onComplete: function() { baddyLeftFx.start('left',rightDistance); }
			var baddyLeftFx = new Fx.Tween(baddy,{
				duration: baddyDuration,
				onComplete: function() { baddyRightFx.start('left',180); }
		/* ACTION! */

The MooTools JavaScript is the fun part. I create 4 Fx.Tween objects that will act as the “up” and “down” animations. Once one finishes, the next one is directed start. So simple!

I know: ridiculous. It was a great way to mix the old school an new school though!