mirror of
https://github.com/tweenjs/tween.js.git
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98 lines
2.5 KiB
HTML
98 lines
2.5 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<title>Tween.js / hello world!</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<link href="css/style.css" media="screen" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<div id="info">
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<h1><a href="http://github.com/tweenjs/tween.js">tween.js</a></h1>
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<h2>18 _ start from current values</h2>
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<p>Example for illustrating the startFromCurrentValues() functionality.</p>
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<button id="start-tween">Start tween</button>
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<button id="up">↑</button>
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<button id="down">↓</button>
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<button id="left">←</button>
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<button id="right">→</button>
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</div>
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<div
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id="target"
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style="
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position: absolute;
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transform: translate(400px, 200px);
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width: 100px;
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height: 100px;
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background: #a0dde9;
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padding: 1em;
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"
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></div>
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<script src="../dist/tween.umd.js"></script>
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<script>
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var position
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var target
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var tween, tweenBack
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init()
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animate()
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function init() {
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position = {x: 400, y: 200}
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target = document.getElementById('target')
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tween = new TWEEN.Tween(position).to({x: 700, y: 200}, 2000).easing(TWEEN.Easing.Elastic.InOut).onUpdate(update)
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document.getElementById('start-tween').addEventListener('click', () => {
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tween.startFromCurrentValues() // start the tween from its current position
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animate() // call animate as we unregister the handler if TWEEN.update(time) returns false
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})
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registerArrowButtonEventListeners()
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}
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//If we register the callback animate, but the TWEEN.update(time) returns false,
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//cancel/unregister the handler
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function animate(time) {
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var id = requestAnimationFrame(animate)
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var result = TWEEN.update(time)
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if (!result) cancelAnimationFrame(id)
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}
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function update() {
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target.style.transform = `translate(${position.x}px, ${position.y}px)`
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}
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//Add event listeners to each of the arrow buttons
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function registerArrowButtonEventListeners() {
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document.getElementById('up').addEventListener('click', moveUp)
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document.getElementById('down').addEventListener('click', moveDown)
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document.getElementById('left').addEventListener('click', moveLeft)
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document.getElementById('right').addEventListener('click', moveRight)
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}
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// Arrow button callbacks
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function moveLeft() {
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position.x -= 20
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update()
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}
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function moveRight() {
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position.x += 20
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update()
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}
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function moveUp() {
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position.y -= 20
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update()
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}
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function moveDown() {
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position.y += 20
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update()
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}
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</script>
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</body>
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</html>
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