examples/07_dynamic_to.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>Tween.js / dynamic to</title>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
		<style>
			body {
				margin: 0px;
			}

			#target {
				font-size: 13px;
				padding: 0px 32px;
			}
		</style>
		<link href="css/style.css" media="screen" rel="stylesheet" type="text/css" />
	</head>
	<body>
		<div id="info" style="position: relative;">
			<h1><a href="http://github.com/tweenjs/tween.js">tween.js</a></h1>
			<h2>07 _ dynamic to</h2>
			<p>tweening towards a moving target</p>
		</div>

		<div id="target"></div>

		<script src="../dist/tween.umd.js"></script>
		<script src="js/RequestAnimationFrame.js"></script>
		<script>
			init()
			animate()

			function init() {
				var width = 480
				var height = 320

				var target = document.getElementById('target')

				var canvas = document.createElement('canvas')
				canvas.width = width
				canvas.height = height
				target.appendChild(canvas)

				var context = canvas.getContext('2d')

				var rabbit = {x: width - 50, y: 50}

				new TWEEN.Tween(rabbit)
					.to({x: width - 50, y: height - 50}, 3000)
					.easing(TWEEN.Easing.Exponential.InOut)
					.onUpdate(function (object) {
						// draw background
						context.fillStyle = 'rgb(240,250,240)'
						context.fillRect(0, 0, width, height)

						// draw rabbit
						context.fillStyle = 'rgb(150,150,150)'

						context.save()
						context.translate(object.x, object.y)

						context.beginPath()
						context.moveTo(0, 0)
						context.bezierCurveTo(15, 0, 15, -40, 5, -30)
						context.lineTo(0, 0)
						context.bezierCurveTo(-15, 0, -15, -40, -5, -30)
						context.lineTo(0, 0)
						context.fill()

						context.beginPath()
						context.arc(0, 0, 15, 0, Math.PI * 2, true)
						context.fill()

						context.restore()
					})
					.start()

				var fox = {x: 50, y: 50}

				new TWEEN.Tween(fox)
					.to(rabbit, 3000)
					.easing(TWEEN.Easing.Exponential.InOut)
					.onUpdate(function (object) {
						// draw fox
						context.fillStyle = 'rgb(200,80,80)'

						context.save()
						context.translate(object.x, object.y - 13)
						context.scale(1.2, 1.2)

						context.beginPath()
						context.moveTo(4, 24)
						context.lineTo(8, 16)
						context.lineTo(14, 10)
						context.lineTo(15, 0)
						context.lineTo(9, -10)
						context.lineTo(2, 0)
						context.lineTo(-2, 0)
						context.lineTo(-9, -10)
						context.lineTo(-15, 0)
						context.lineTo(-14, 10)
						context.lineTo(-8, 16)
						context.lineTo(-4, 24)
						context.closePath()
						context.fill()

						context.restore()
					})
					.start()
			}

			function animate(time) {
				requestAnimationFrame(animate)

				TWEEN.update(time)
			}

			animate()
		</script>
	</body>
</html>