examples/10_yoyo.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>Tween.js / yoyo</title>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<link href="css/style.css" media="screen" rel="stylesheet" type="text/css" />
	</head>
	<body>
		<div id="info">
			<h1><a href="http://github.com/sole/tween.js">tween.js</a></h1>
			<h2>10 _ yoyo</h2>
			<p>Demonstrating the yoyo() feature.</p>
		</div>
		<div style="position: absolute; top: 100px; left: 400px; ">
			<div id="target1" data-rotation="0" data-y="0" class="box" style="left: 0px; top: 0px">
				yoyo with repeat once
			</div>
			<div id="target2" data-rotation="0" data-y="0" class="box" style="left: 300px; top: 0px">
				yoyo with repeat forever
			</div>
		</div>

		<script src="../build/tween.min.js"></script>
		<script src="js/RequestAnimationFrame.js"></script>
		<script>

			init();
			animate();

			function init() {
				var target1 = document.getElementById( 'target1' ),
					tween1 = new TWEEN.Tween( target1.dataset )
						.to( { rotation: 360, y: 300 }, 750 )
						.repeat( 1 )
						.delay( 1000 )
						.yoyo( true )
						.easing( TWEEN.Easing.Cubic.InOut )
						.onUpdate( function() {
							updateBox( target1, this );
						})
						.start(),
					target2 = document.getElementById( 'target2' ),
					tween2 = new TWEEN.Tween( target2.dataset )
						.to( { rotation: 360, y:300 }, 750 )
						.repeat( Infinity )
						.delay( 1000 )
						.yoyo( true )
						.easing( TWEEN.Easing.Cubic.InOut )
						.onUpdate( function() {
							updateBox( target2, this );
						})
						.start();
			}

			function animate() {

				requestAnimationFrame( animate );

				TWEEN.update();

			}

			function updateBox( box, params ) {

				var s = box.style,
					transform = 'rotate(' + Math.floor( params.rotation ) + 'deg)';
				s.webkitTransform = transform;
				s.mozTransform = transform;
				s.transform = transform;

				box.style.top = params.y + 'px';
			}

		</script>

		<style type="text/css">
			.box {
				width: 100px;
				height: 100px;
				display: block;
				-webkit-border-radius: 70px;
				-moz-border-radius: 70px;
				border-radius: 70px;
				position: absolute;
				border: 1px solid black;
				font-size: 10px;
				padding: 20px;
			}
			#target1 {
				background: #fcc;
			}
			#target2 {
				background: #cfc;
			}
		</style>
	</body>
</html>