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102 lines
2.8 KiB
HTML
102 lines
2.8 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Tween.js / graphs for custom easing functions</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<style>
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body {
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margin: 0px;
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}
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#target {
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font-size: 13px;
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padding: 0px 32px;
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}
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</style>
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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" style="position: relative;">
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<h1><a href="http://github.com/tweenjs/tween.js">tween.js</a></h1>
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<h2>12 _ graphs for custom easing functions</h2>
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<p>A version of the <a href="03_graphs.html">graphs</a> example, but using custom easing functions (not included in <a href="https://github.com/tween.js/tween.js">tween.js</a> by default).</p>
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</div>
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<div id="target"></div>
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<script src="../src/Tween.js"></script>
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<script src="js/RequestAnimationFrame.js"></script>
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<script src="js/createGraph.js"></script>
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<script>
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window.addEventListener('load', function() {
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init();
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animate();
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});
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function init() {
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var target = document.getElementById('target');
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target.appendChild( createGraph( 'Ten Steps', tenStepsEasing ) );
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target.appendChild( document.createElement( 'br' ) );
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for(var i = 0; i < 4; i++) {
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var numSteps = (i + 1) * 4;
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target.appendChild( createGraph(numSteps + ' steps', createStepFunction(numSteps)) );
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}
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target.appendChild( document.createElement( 'br' ) );
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target.appendChild( createGraph('Random', randomEasing) );
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target.appendChild( document.createElement( 'br' ) );
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target.appendChild( createGraph('Noisy Exponential.InOut', createNoisyEasing(0.1, TWEEN.Easing.Exponential.InOut) ) );
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target.appendChild( createGraph('Noisy Elastic.InOut', createNoisyEasing(0.1, TWEEN.Easing.Elastic.InOut) ) );
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target.appendChild( createGraph('Noisy Circular.InOut', createNoisyEasing(0.1, TWEEN.Easing.Circular.InOut) ) );
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}
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function animate() {
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requestAnimationFrame( animate );
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TWEEN.update();
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}
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function tenStepsEasing(k) {
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return (Math.floor(k * 10) / 10);
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}
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// This is where we get very meta and write a function for
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// generating functions! The returned function is similar to
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// the tenStepsEasing function above, but the number of steps
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// is passed as a parameter
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function createStepFunction(numSteps) {
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return function(k) {
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return (Math.floor(k * numSteps) / numSteps);
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}
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}
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function randomEasing(k) {
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return Math.random();
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}
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// Getting meta again: why not use existing functions as the
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// base for new easing functions?
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function createNoisyEasing(randomProportion, easingFunction) {
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var normalProportion = 1.0 - randomProportion;
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return function(k) {
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return randomProportion * Math.random() + normalProportion * easingFunction(k);
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}
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}
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</script>
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</body>
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</html>
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