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<!DOCTYPE html><html><head><title>PixelRatio</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="PixelRatio"><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 rel="stylesheet" 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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/nativemethodsmixin.html">NativeMethodsMixin</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="active" 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></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="pixelratio"></a>PixelRatio <a class="hash-link" href="docs/pixelratio.html#pixelratio">#</a></h1><div><div><p>PixelRatio class gives access to the device pixel density.</p><h3><a class="anchor" name="fetching-a-correctly-sized-image"></a>Fetching a correctly sized image <a class="hash-link" href="docs/pixelratio.html#fetching-a-correctly-sized-image">#</a></h3><p>You should get a higher resolution image if you are on a high pixel density
device. A good rule of thumb is to multiply the size of the image you display
by the pixel ratio.</p><div class="prism language-javascript"><span class="token keyword">var</span> image <span class="token operator">=</span> <span class="token function">getImage<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
width<span class="token punctuation">:</span> PixelRatio<span class="token punctuation">.</span><span class="token function">getPixelSizeForLayoutSize<span class="token punctuation">(</span></span><span class="token number">200</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
height<span class="token punctuation">:</span> PixelRatio<span class="token punctuation">.</span><span class="token function">getPixelSizeForLayoutSize<span class="token punctuation">(</span></span><span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
&lt;Image source<span class="token operator">=</span><span class="token punctuation">{</span>image<span class="token punctuation">}</span> style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>width<span class="token punctuation">:</span> <span class="token number">200</span><span class="token punctuation">,</span> height<span class="token punctuation">:</span> <span class="token number">100</span><span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">&gt;</span></div></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/pixelratio.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="get"></a><span class="methodType">static </span>get<span class="methodType">()</span> <a class="hash-link" href="docs/pixelratio.html#get">#</a></h4><div><p>Returns the device pixel density. Some examples:</p><ul><li>PixelRatio.get() === 1<ul><li>mdpi Android devices (160 dpi)</li></ul></li><li>PixelRatio.get() === 1.5<ul><li>hdpi Android devices (240 dpi)</li></ul></li><li>PixelRatio.get() === 2<ul><li>iPhone 4, 4S</li><li>iPhone 5, 5c, 5s</li><li>iPhone 6</li><li>xhdpi Android devices (320 dpi)</li></ul></li><li>PixelRatio.get() === 3<ul><li>iPhone 6 plus</li><li>xxhdpi Android devices (480 dpi)</li></ul></li><li>PixelRatio.get() === 3.5<ul><li>Nexus 6</li></ul></li></ul></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="getfontscale"></a><span class="methodType">static </span>getFontScale<span class="methodType">()</span> <a class="hash-link" href="docs/pixelratio.html#getfontscale">#</a></h4><div><p>Returns the scaling factor for font sizes. This is the ratio that is used to calculate the
absolute font size, so any elements that heavily depend on that should use this to do
calculations.</p><p>If a font scale is not set, this returns the device pixel ratio.</p><p>Currently this is only implemented on Android and reflects the user preference set in
Settings &gt; Display &gt; Font size, on iOS it will always return the default pixel ratio.
@platform android</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="getpixelsizeforlayoutsize"></a><span class="methodType">static </span>getPixelSizeForLayoutSize<span class="methodType">(layoutSize)</span> <a class="hash-link" href="docs/pixelratio.html#getpixelsizeforlayoutsize">#</a></h4><div><p>Converts a layout size (dp) to pixel size (px).</p><p>Guaranteed to return an integer number.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="roundtonearestpixel"></a><span class="methodType">static </span>roundToNearestPixel<span class="methodType">(layoutSize)</span> <a class="hash-link" href="docs/pixelratio.html#roundtonearestpixel">#</a></h4><div><p>Rounds a layout size (dp) to the nearest layout size that corresponds to
an integer number of pixels. For example, on a device with a PixelRatio
of 3, <code>PixelRatio.roundToNearestPixel(8.4) = 8.33</code>, which corresponds to
exactly (8.33 * 3) = 25 pixels.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="startdetecting"></a><span class="methodType">static </span>startDetecting<span class="methodType">()</span> <a class="hash-link" href="docs/pixelratio.html#startdetecting">#</a></h4><div><p>// No-op for iOS, but used on the web. Should not be documented.</p></div></div></div></span></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Utilities/PixelRatio.js">edit the content above on GitHub</a> and send us a pull request!</p><div><h1><a class="anchor" name="description"></a>Description <a class="hash-link" href="docs/pixelratio.html#description">#</a></h1><div><h2><a class="anchor" name="pixel-grid-snapping"></a>Pixel Grid Snapping <a class="hash-link" href="docs/pixelratio.html#pixel-grid-snapping">#</a></h2><p>In iOS, you can specify positions and dimensions for elements with arbitrary precision, for example 29.674825. But, ultimately the physical display only have a fixed number of pixels, for example 640×960 for iPhone 4 or 750×1334 for iPhone 6. iOS tries to be as faithful as possible to the user value by spreading one original pixel into multiple ones to trick the eye. The downside of this technique is that it makes the resulting element look blurry.</p><p>In practice, we found out that developers do not want this feature and they have to work around it by doing manual rounding in order to avoid having blurry elements. In React Native, we are rounding all the pixels automatically.</p><p>We have to be careful when to do this rounding. You never want to work with rounded and unrounded values at the same time as you&#x27;re going to accumulate rounding errors. Having even one rounding error is deadly because a one pixel border may vanish or be twice as big.</p><p>In React Native, everything in JS and within the layout engine work with arbitrary precision numbers. It&#x27;s only when we set the position and dimensions of the native element on the main thread that we round. Also, rounding is done relative to the root rather than the parent, again to avoid accumulating rounding errors.</p></div><p class="edit-page-block">You can <a target="_blank" href="https://github.com/facebook/react-native/blob/master/docs/PixelRatio.md">edit the content above on GitHub</a> and send us a pull request!</p></div><div class="docs-prevnext"><a class="docs-prev" href="docs/permissionsandroid.html#content">← Prev</a><a class="docs-next" href="docs/pushnotificationios.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">Tutorial</a><a href="docs/integration-with-existing-apps.html">Integration With Existing Apps</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">Showcase</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Upcoming Events</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="https://github.com/facebook/react-native" target="_blank">GitHub</a><a href="http://facebook.github.io/react/" target="_blank">React</a></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&amp;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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