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<html><head><meta charset="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge, chrome=1"/><title>Easing · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta property="og:title" content="Easing · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="The `Easing` module implements common easing functions. This module is used"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://facebook.github.io/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/blog/feed.xml" title="React Native Blog RSS Feed"/><script type="text/javascript" src="https://snack.expo.io/embed.js"></script><script type="text/javascript" src="/react-native/js/codeblocks.js"></script><link rel="stylesheet" href="/react-native/css/main.css"/></head><body class="sideNavVisible"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/react-native/"><img class="logo" src="/react-native/img/header_logo.png"/><h2 class="headerTitle">React 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id="navToggler"><i></i></div><h2><i>›</i><span>APIs</span></h2></div><div class="navGroups"><div class="navGroup navGroupActive"><h3>The Basics</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/getting-started.html">Getting Started</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/tutorial.html">Learn the Basics</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/props.html">Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/state.html">State</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/style.html">Style</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/height-and-width.html">Height and Width</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/flexbox.html">Layout with Flexbox</a></li><li class="navListItem"><a class="navItem" 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href="/react-native/docs/0.45/flatlist.html">FlatList</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/image.html">Image</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/listview.html">ListView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/modal.html">Modal</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/navigatorios.html">NavigatorIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/picker.html">Picker</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/pickerios.html">PickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/progressbarandroid.html">ProgressBarAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/progressviewios.html">ProgressViewIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/refreshcontrol.html">RefreshControl</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/scrollview.html">ScrollView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/sectionlist.html">SectionList</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/segmentedcontrolios.html">SegmentedControlIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/slider.html">Slider</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/snapshotviewios.html">SnapshotViewIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/statusbar.html">StatusBar</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/switch.html">Switch</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/tabbarios.html">TabBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/tabbarios-item.html">TabBarIOS.Item</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/text.html">Text</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/textinput.html">TextInput</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/toolbarandroid.html">ToolbarAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/touchablehighlight.html">TouchableHighlight</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/touchableopacity.html">TouchableOpacity</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/view.html">View</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/viewpagerandroid.html">ViewPagerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/virtualizedlist.html">VirtualizedList</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/webview.html">WebView</a></li></ul></div><div class="navGroup navGroupActive"><h3>APIs</h3><ul><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/accessibilityinfo.html">AccessibilityInfo</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/actionsheetios.html">ActionSheetIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/alert.html">Alert</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/alertios.html">AlertIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/animated.html">Animated</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/appregistry.html">AppRegistry</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/appstate.html">AppState</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/asyncstorage.html">AsyncStorage</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/backandroid.html">BackAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/backhandler.html">BackHandler</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/cameraroll.html">CameraRoll</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/clipboard.html">Clipboard</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/datepickerandroid.html">DatePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/dimensions.html">Dimensions</a></li><li class="navListItem navListItemActive"><a class="navItem navItemActive" href="/react-native/docs/0.45/easing.html">Easing</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/geolocation.html">Geolocation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/imageeditor.html">ImageEditor</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/imagepickerios.html">ImagePickerIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/imagestore.html">ImageStore</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/image-style-props.html">Image Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/interactionmanager.html">InteractionManager</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/keyboard.html">Keyboard</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/layout-props.html">Layout Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/layoutanimation.html">LayoutAnimation</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/linking.html">Linking</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/listviewdatasource.html">ListViewDataSource</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/netinfo.html">NetInfo</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/panresponder.html">PanResponder</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/permissionsandroid.html">PermissionsAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/pixelratio.html">PixelRatio</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/pushnotificationios.html">PushNotificationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/settings.html">Settings</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/shadow-props.html">Shadow Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/share.html">Share</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/statusbarios.html">StatusBarIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/stylesheet.html">StyleSheet</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/systrace.html">Systrace</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/text-style-props.html">Text Style Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/timepickerandroid.html">TimePickerAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/toastandroid.html">ToastAndroid</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/transforms.html">Transforms</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/vibration.html">Vibration</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/vibrationios.html">VibrationIOS</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/0.45/view-style-props.html">View Style Props</a></li></ul></div></div></section></div><script>
var toggler = document.getElementById('navToggler');
var nav = document.getElementById('docsNav');
toggler.onclick = function() {
nav.classList.toggle('docsSliderActive');
};
</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/website/versioned_docs/version-0.43/easing.md" target="_blank">Edit</a><h1>Easing</h1></header><article><div><span><p>The <code>Easing</code> module implements common easing functions. This module is used
by <a href="animate.md#timing">Animate.timing()</a> to convey physically
believable motion in animations.</p>
<p>You can find a visualization of some common easing functions at
<a href="http://easings.net/">http://easings.net/</a></p>
<h3><a class="anchor" aria-hidden="true" name="predefined-animations"></a><a href="#predefined-animations" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Predefined animations</h3>
<p>The <code>Easing</code> module provides several predefined animations through the
following methods:</p>
<ul>
<li><a href="/react-native/docs/0.45/easing.html#back"><code>back</code></a> provides a simple animation where the
object goes slightly back before moving forward</li>
<li><a href="/react-native/docs/0.45/easing.html#bounce"><code>bounce</code></a> provides a bouncing animation</li>
<li><a href="/react-native/docs/0.45/easing.html#ease"><code>ease</code></a> provides a simple inertial animation</li>
<li><a href="/react-native/docs/0.45/easing.html#elastic"><code>elastic</code></a> provides a simple spring interaction</li>
</ul>
<h3><a class="anchor" aria-hidden="true" name="standard-functions"></a><a href="#standard-functions" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Standard functions</h3>
<p>Three standard easing functions are provided:</p>
<ul>
<li><a href="/react-native/docs/0.45/easing.html#linear"><code>linear</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#quad"><code>quad</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#cubic"><code>cubic</code></a></li>
</ul>
<p>The <a href="/react-native/docs/0.45/easing.html#poly"><code>poly</code></a> function can be used to implement
quartic, quintic, and other higher power functions.</p>
<h3><a class="anchor" aria-hidden="true" name="additional-functions"></a><a href="#additional-functions" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Additional functions</h3>
<p>Additional mathematical functions are provided by the following methods:</p>
<ul>
<li><a href="/react-native/docs/0.45/easing.html#bezier"><code>bezier</code></a> provides a cubic bezier curve</li>
<li><a href="/react-native/docs/0.45/easing.html#circle"><code>circle</code></a> provides a circular function</li>
<li><a href="/react-native/docs/0.45/easing.html#sin"><code>sin</code></a> provides a sinusoidal function</li>
<li><a href="/react-native/docs/0.45/easing.html#exp"><code>exp</code></a> provides an exponential function</li>
</ul>
<p>The following helpers are used to modify other easing functions.</p>
<ul>
<li><a href="/react-native/docs/0.45/easing.html#in"><code>in</code></a> runs an easing function forwards</li>
<li><a href="/react-native/docs/0.45/easing.html#inout"><code>inOut</code></a> makes any easing function symmetrical</li>
<li><a href="/react-native/docs/0.45/easing.html#out"><code>out</code></a> runs an easing function backwards</li>
</ul>
<h3><a class="anchor" aria-hidden="true" name="methods"></a><a href="#methods" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h3>
<ul>
<li><a href="/react-native/docs/0.45/easing.html#step0"><code>step0</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#step1"><code>step1</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#linear"><code>linear</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#ease"><code>ease</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#quad"><code>quad</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#cubic"><code>cubic</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#poly"><code>poly</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#sin"><code>sin</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#circle"><code>circle</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#exp"><code>exp</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#elastic"><code>elastic</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#back"><code>back</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#bounce"><code>bounce</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#bezier"><code>bezier</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#in"><code>in</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#out"><code>out</code></a></li>
<li><a href="/react-native/docs/0.45/easing.html#inout"><code>inOut</code></a></li>
</ul>
<hr>
<h1><a class="anchor" aria-hidden="true" name="reference"></a><a href="#reference" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reference</h1>
<h2><a class="anchor" aria-hidden="true" name="methods"></a><a href="#methods" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Methods</h2>
<h3><a class="anchor" aria-hidden="true" name="step0"></a><a href="#step0" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>step0()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> step0(n)
</code></pre>
<p>A stepping function, returns 1 for any positive value of <code>n</code>.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="step1"></a><a href="#step1" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>step1()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> step1(n)
</code></pre>
<p>A stepping function, returns 1 if <code>n</code> is greater than or equal to 1.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="linear"></a><a href="#linear" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>linear()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> linear(t)
</code></pre>
<p>A linear function, <code>f(t) = t</code>. Position correlates to elapsed time one to
one.</p>
<p><a href="http://cubic-bezier.com/#0,0,1,1">http://cubic-bezier.com/#0,0,1,1</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="ease"></a><a href="#ease" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>ease()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> ease(t)
</code></pre>
<p>A simple inertial interaction, similar to an object slowly accelerating to
speed.</p>
<p><a href="http://cubic-bezier.com/#.42,0,1,1">http://cubic-bezier.com/#.42,0,1,1</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="quad"></a><a href="#quad" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>quad()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> quad(t)
</code></pre>
<p>A quadratic function, <code>f(t) = t * t</code>. Position equals the square of elapsed
time.</p>
<p><a href="http://easings.net/#easeInQuad">http://easings.net/#easeInQuad</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="cubic"></a><a href="#cubic" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>cubic()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> cubic(t)
</code></pre>
<p>A cubic function, <code>f(t) = t * t * t</code>. Position equals the cube of elapsed
time.</p>
<p><a href="http://easings.net/#easeInCubic">http://easings.net/#easeInCubic</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="poly"></a><a href="#poly" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>poly()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> poly(n)
</code></pre>
<p>A power function. Position is equal to the Nth power of elapsed time.</p>
<p>n = 4: <a href="http://easings.net/#easeInQuart">http://easings.net/#easeInQuart</a>
n = 5: <a href="http://easings.net/#easeInQuint">http://easings.net/#easeInQuint</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="sin"></a><a href="#sin" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>sin()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> sin(t)
</code></pre>
<p>A sinusoidal function.</p>
<p><a href="http://easings.net/#easeInSine">http://easings.net/#easeInSine</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="circle"></a><a href="#circle" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>circle()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> circle(t)
</code></pre>
<p>A circular function.</p>
<p><a href="http://easings.net/#easeInCirc">http://easings.net/#easeInCirc</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="exp"></a><a href="#exp" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>exp()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> exp(t)
</code></pre>
<p>An exponential function.</p>
<p><a href="http://easings.net/#easeInExpo">http://easings.net/#easeInExpo</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="elastic"></a><a href="#elastic" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>elastic()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> elastic(bounciness)
</code></pre>
<p>A simple elastic interaction, similar to a spring oscillating back and
forth.</p>
<p>Default bounciness is 1, which overshoots a little bit once. 0 bounciness
doesn't overshoot at all, and bounciness of N &gt; 1 will overshoot about N
times.</p>
<p><a href="http://easings.net/#easeInElastic">http://easings.net/#easeInElastic</a></p>
<p>Wolfram Plots:</p>
<ul>
<li><a href="http://tiny.cc/elastic_b_1">http://tiny.cc/elastic_b_1</a> (bounciness = 1, default)</li>
<li><a href="http://tiny.cc/elastic_b_3">http://tiny.cc/elastic_b_3</a> (bounciness = 3)</li>
</ul>
<hr>
<h3><a class="anchor" aria-hidden="true" name="back"></a><a href="#back" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>back()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> back(s)
</code></pre>
<p>Use with <code>Animated.parallel()</code> to create a simple effect where the object
animates back slightly as the animation starts.</p>
<p>Wolfram Plot:</p>
<ul>
<li><a href="http://tiny.cc/back_default">http://tiny.cc/back_default</a> (s = 1.70158, default)</li>
</ul>
<hr>
<h3><a class="anchor" aria-hidden="true" name="bounce"></a><a href="#bounce" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>bounce()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> bounce(t)
</code></pre>
<p>Provides a simple bouncing effect.</p>
<p><a href="http://easings.net/#easeInBounce">http://easings.net/#easeInBounce</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="bezier"></a><a href="#bezier" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>bezier()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> bezier(x1, y1, x2, y2)
</code></pre>
<p>Provides a cubic bezier curve, equivalent to CSS Transitions'
<code>transition-timing-function</code>.</p>
<p>A useful tool to visualize cubic bezier curves can be found at
<a href="http://cubic-bezier.com/">http://cubic-bezier.com/</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="in"></a><a href="#in" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>in()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> <span class="hljs-keyword">in</span>(easing)
</code></pre>
<p>Runs an easing function forwards.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="out"></a><a href="#out" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>out()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> out(easing)
</code></pre>
<p>Runs an easing function backwards.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" name="inout"></a><a href="#inout" aria-hidden="true" class="hash-link" ><svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>inOut()</code></h3>
<pre><code class="hljs css javascript"><span class="hljs-keyword">static</span> inOut(easing)
</code></pre>
<p>Makes any easing function symmetrical. The easing function will run
forwards for half of the duration, then backwards for the rest of the
duration.</p>
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