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<!DOCTYPE html><html><head><title>Easing - React Native</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="Easing - React Native"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link 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native and React Native</a></li><li><a style="margin-left:10px;" class="" href="docs/building-for-apple-tv.html">Building For Apple TV</a></li><li><a style="margin-left:10px;" class="" href="docs/app-extensions.html">App Extensions</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:10px;" class="" href="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:10px;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:10px;" class="" href="docs/headless-js-android.html">Headless JS</a></li><li><a style="margin-left:10px;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:10px;" class="" href="docs/android-building-from-source.html">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>Contributing</h3><ul><li><a style="margin-left:10px;" class="" 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style="margin-left:10px;" class="" href="docs/image.html">Image</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboardavoidingview.html">KeyboardAvoidingView</a></li><li><a style="margin-left:10px;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:10px;" class="" href="docs/maskedviewios.html">MaskedViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:10px;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:10px;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:10px;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:10px;" class="" href="docs/sectionlist.html">SectionList</a></li><li><a style="margin-left:10px;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:10px;" class="" href="docs/snapshotviewios.html">SnapshotViewIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:10px;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:10px;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:10px;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:10px;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:10px;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:10px;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:10px;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/virtualizedlist.html">VirtualizedList</a></li><li><a style="margin-left:10px;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>APIs</h3><ul><li><a style="margin-left:10px;" class="" href="docs/accessibilityinfo.html">AccessibilityInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:10px;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:10px;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:10px;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:10px;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:10px;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/backhandler.html">BackHandler</a></li><li><a style="margin-left:10px;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:10px;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:10px;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:10px;" class="active" href="docs/easing.html">Easing</a></li><li><a style="margin-left:10px;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:10px;" class="" href="docs/imageeditor.html">ImageEditor</a></li><li><a style="margin-left:10px;" class="" href="docs/imagepickerios.html">ImagePickerIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestore.html">ImageStore</a></li><li><a style="margin-left:10px;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:10px;" class="" href="docs/keyboard.html">Keyboard</a></li><li><a style="margin-left:10px;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:10px;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:10px;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:10px;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:10px;" class="" href="docs/permissionsandroid.html">PermissionsAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:10px;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/settings.html">Settings</a></li><li><a style="margin-left:10px;" class="" href="docs/share.html">Share</a></li><li><a style="margin-left:10px;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:10px;" class="" href="docs/systrace.html">Systrace</a></li><li><a style="margin-left:10px;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:10px;" class="" href="docs/vibration.html">Vibration</a></li><li><a style="margin-left:10px;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li><li><a style="margin-left:10px;" class="" href="docs/viewproptypes.html">ViewPropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/viewstyleproptypes.html">ViewStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/textstyleproptypes.html">TextStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestyleproptypes.html">ImageStylePropTypes</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="easing"></a>Easing <a class="hash-link" href="docs/easing.html#easing">#</a></h1><div><div><p>The <code>Easing</code> module implements common easing functions. This module is used
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by <a href="docs/animate.html#timing" target="_blank">Animate.timing()</a> to convey physically
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believable motion in animations.</p><p>You can find a visualization of some common easing functions at
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<a href="http://easings.net/">http://easings.net/</a></p><h3><a class="anchor" name="predefined-animations"></a>Predefined animations <a class="hash-link" href="docs/easing.html#predefined-animations">#</a></h3><p>The <code>Easing</code> module provides several predefined animations through the
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following methods:</p><ul><li><a href="docs/easing.html#back" target="_blank"><code>back</code></a> provides a simple animation where the
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object goes slightly back before moving forward</li><li><a href="docs/easing.html#bounce" target="_blank"><code>bounce</code></a> provides a bouncing animation</li><li><a href="docs/easing.html#ease" target="_blank"><code>ease</code></a> provides a simple inertial animation</li><li><a href="docs/easing.html#elastic" target="_blank"><code>elastic</code></a> provides a simple spring interaction</li></ul><h3><a class="anchor" name="standard-functions"></a>Standard functions <a class="hash-link" href="docs/easing.html#standard-functions">#</a></h3><p>Three standard easing functions are provided:</p><ul><li><a href="docs/easing.html#linear" target="_blank"><code>linear</code></a></li><li><a href="docs/easing.html#quad" target="_blank"><code>quad</code></a></li><li><a href="docs/easing.html#cubic" target="_blank"><code>cubic</code></a></li></ul><p>The <a href="docs/easing.html#poly" target="_blank"><code>poly</code></a> function can be used to implement
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quartic, quintic, and other higher power functions.</p><h3><a class="anchor" name="additional-functions"></a>Additional functions <a class="hash-link" href="docs/easing.html#additional-functions">#</a></h3><p>Additional mathematical functions are provided by the following methods:</p><ul><li><a href="docs/easing.html#bezier" target="_blank"><code>bezier</code></a> provides a cubic bezier curve</li><li><a href="docs/easing.html#circle" target="_blank"><code>circle</code></a> provides a circular function</li><li><a href="docs/easing.html#sin" target="_blank"><code>sin</code></a> provides a sinusoidal function</li><li><a href="docs/easing.html#exp" target="_blank"><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="docs/easing.html#in" target="_blank"><code>in</code></a> runs an easing function forwards</li><li><a href="docs/easing.html#inout" target="_blank"><code>inOut</code></a> makes any easing function symmetrical</li><li><a href="docs/easing.html#out" target="_blank"><code>out</code></a> runs an easing function backwards</li></ul></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/easing.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="step0"></a><span class="methodType">static </span>step0<span class="methodType">(n)</span> <a class="hash-link" href="docs/easing.html#step0">#</a></h4><div><p>A stepping function, returns 1 for any positive value of <code>n</code>.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="step1"></a><span class="methodType">static </span>step1<span class="methodType">(n)</span> <a class="hash-link" href="docs/easing.html#step1">#</a></h4><div><p>A stepping function, returns 1 if <code>n</code> is greater than or equal to 1.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="linear"></a><span class="methodType">static </span>linear<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#linear">#</a></h4><div><p>A linear function, <code>f(t) = t</code>. Position correlates to elapsed time one to
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one.</p><p><a href="http://cubic-bezier.com/#0,0,1,1">http://cubic-bezier.com/#0,0,1,1</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="ease"></a><span class="methodType">static </span>ease<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#ease">#</a></h4><div><p>A simple inertial interaction, similar to an object slowly accelerating to
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speed.</p><p><a href="http://cubic-bezier.com/#.42,0,1,1">http://cubic-bezier.com/#.42,0,1,1</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="quad"></a><span class="methodType">static </span>quad<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#quad">#</a></h4><div><p>A quadratic function, <code>f(t) = t * t</code>. Position equals the square of elapsed
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time.</p><p><a href="http://easings.net/#easeInQuad">http://easings.net/#easeInQuad</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="cubic"></a><span class="methodType">static </span>cubic<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#cubic">#</a></h4><div><p>A cubic function, <code>f(t) = t * t * t</code>. Position equals the cube of elapsed
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time.</p><p><a href="http://easings.net/#easeInCubic">http://easings.net/#easeInCubic</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="poly"></a><span class="methodType">static </span>poly<span class="methodType">(n)</span> <a class="hash-link" href="docs/easing.html#poly">#</a></h4><div><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>
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n = 5: <a href="http://easings.net/#easeInQuint">http://easings.net/#easeInQuint</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="sin"></a><span class="methodType">static </span>sin<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#sin">#</a></h4><div><p>A sinusoidal function.</p><p><a href="http://easings.net/#easeInSine">http://easings.net/#easeInSine</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="circle"></a><span class="methodType">static </span>circle<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#circle">#</a></h4><div><p>A circular function.</p><p><a href="http://easings.net/#easeInCirc">http://easings.net/#easeInCirc</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="exp"></a><span class="methodType">static </span>exp<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#exp">#</a></h4><div><p>An exponential function.</p><p><a href="http://easings.net/#easeInExpo">http://easings.net/#easeInExpo</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="elastic"></a><span class="methodType">static </span>elastic<span class="methodType">(bounciness)</span> <a class="hash-link" href="docs/easing.html#elastic">#</a></h4><div><p>A simple elastic interaction, similar to a spring oscillating back and
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forth.</p><p>Default bounciness is 1, which overshoots a little bit once. 0 bounciness
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doesn't overshoot at all, and bounciness of N > 1 will overshoot about N
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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></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="back"></a><span class="methodType">static </span>back<span class="methodType">(s)</span> <a class="hash-link" href="docs/easing.html#back">#</a></h4><div><p>Use with <code>Animated.parallel()</code> to create a simple effect where the object
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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></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="bounce"></a><span class="methodType">static </span>bounce<span class="methodType">(t)</span> <a class="hash-link" href="docs/easing.html#bounce">#</a></h4><div><p>Provides a simple bouncing effect.</p><p><a href="http://easings.net/#easeInBounce">http://easings.net/#easeInBounce</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="bezier"></a><span class="methodType">static </span>bezier<span class="methodType">(x1, y1, x2, y2)</span> <a class="hash-link" href="docs/easing.html#bezier">#</a></h4><div><p>Provides a cubic bezier curve, equivalent to CSS Transitions'
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<code>transition-timing-function</code>.</p><p>A useful tool to visualize cubic bezier curves can be found at
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<a href="http://cubic-bezier.com/">http://cubic-bezier.com/</a></p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="in"></a><span class="methodType">static </span>in<span class="methodType">(easing)</span> <a class="hash-link" href="docs/easing.html#in">#</a></h4><div><p>Runs an easing function forwards.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="out"></a><span class="methodType">static </span>out<span class="methodType">(easing)</span> <a class="hash-link" href="docs/easing.html#out">#</a></h4><div><p>Runs an easing function backwards.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="inout"></a><span class="methodType">static </span>inOut<span class="methodType">(easing)</span> <a class="hash-link" href="docs/easing.html#inout">#</a></h4><div><p>Makes any easing function symmetrical. The easing function will run
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forwards for half of the duration, then backwards for the rest of the
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duration.</p></div></div></div></span></div><p class="edit-page-block"><a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Animated/src/Easing.js">Improve this page</a> by sending a pull request!</p><div class="docs-prevnext"><a class="docs-prev" href="docs/dimensions.html#content">← Prev</a><a class="docs-next" href="docs/geolocation.html#content">Next →</a></div></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Learn the Basics</a><a href="docs/components-and-apis.html">Components and APIs</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Who's using React Native?</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Meetups</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://react-native.canny.io/feature-requests" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="http://facebook.github.io/react/" target="_blank">React</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><div class="githubButton"><a class="github-button" href="https://github.com/facebook/react-native" data-icon="octicon-star" data-count-href="/facebook/react-native/stargazers" data-count-api="/repos/facebook/react-native#stargazers_count" data-count-aria-label="# stargazers on GitHub" aria-label="Star facebook/react-native on GitHub">Star</a></div></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"></a><section class="copyright">Copyright © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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