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<!DOCTYPE HTML> <html lang="" > <head> <meta charset="UTF-8"> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <title>Colors · Chart.js documentation</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="description" content=""> <meta name="generator" content="GitBook 3.2.2"> <meta name="author" content="chartjs"> <link rel="stylesheet" href="../gitbook/style.css"> <link rel="stylesheet" href="../gitbook/gitbook-plugin-search-plus/search.css"> <link rel="stylesheet" href="../gitbook/gitbook-plugin-highlight/website.css"> <link rel="stylesheet" href="../gitbook/gitbook-plugin-fontsettings/website.css"> <link rel="stylesheet" href="../style.css"> <meta name="HandheldFriendly" content="true"/> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <link rel="apple-touch-icon-precomposed" 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data-path="../developers/axes.html"> <a href="../developers/axes.html"> New Axes </a> </li> <li class="chapter " data-level="1.7.6" data-path="../developers/contributing.html"> <a href="../developers/contributing.html"> Contributing </a> </li> </ul> </li> <li class="chapter " data-level="1.8" data-path="../notes/"> <a href="../notes/"> Additional Notes </a> <ul class="articles"> <li class="chapter " data-level="1.8.1" data-path="../notes/comparison.html"> <a href="../notes/comparison.html"> Comparison Table </a> </li> <li class="chapter " data-level="1.8.2" data-path="../notes/extensions.html"> <a href="../notes/extensions.html"> Popular Extensions </a> </li> <li class="chapter " data-level="1.8.3" data-path="../notes/license.html"> <a href="../notes/license.html"> License </a> </li> </ul> </li> <li class="divider"></li> <li> <a href="https://www.gitbook.com" target="blank" class="gitbook-link"> Published with GitBook </a> </li> </ul> </nav> </div> <div class="book-body"> <div class="body-inner"> <div class="book-header" role="navigation"> <!-- Title --> <h1> <i class="fa fa-circle-o-notch fa-spin"></i> <a href=".." >Colors</a> </h1> </div> <div class="page-wrapper" tabindex="-1" role="main"> <div class="page-inner"> <div class="search-plus" id="book-search-results"> <div class="search-noresults"> <section class="normal markdown-section"> <h1 id="colors">Colors</h1> <p>When supplying colors to Chart options, you can use a number of formats. You can specify the color as a string in hexadecimal, RGB, or HSL notations. If a color is needed, but not specified, Chart.js will use the global default color. This color is stored at <code>Chart.defaults.global.defaultColor</code>. It is initially set to <code>'rgba(0, 0, 0, 0.1)'</code></p> <p>You can also pass a <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasGradient" target="_blank">CanvasGradient</a> object. You will need to create this before passing to the chart, but using it you can achieve some interesting effects.</p> <h2 id="patterns-and-gradients">Patterns and Gradients</h2> <p>An alternative option is to pass a <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern" target="_blank">CanvasPattern</a> or <a href="https://developer.mozilla.org/en/docs/Web/API/CanvasGradient" target="_blank">CanvasGradient</a> object instead of a string colour.</p> <p>For example, if you wanted to fill a dataset with a pattern from an image you could do the following.</p> <pre><code class="lang-javascript"><span class="hljs-keyword">var</span> img = <span class="hljs-keyword">new</span> Image(); img.src = <span class="hljs-string">'https://example.com/my_image.png'</span>; img.onload = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{ <span class="hljs-keyword">var</span> ctx = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">'canvas'</span>).getContext(<span class="hljs-string">'2d'</span>); <span class="hljs-keyword">var</span> fillPattern = ctx.createPattern(img, <span class="hljs-string">'repeat'</span>); <span class="hljs-keyword">var</span> chart = <span class="hljs-keyword">new</span> Chart(ctx, { data: { labels: [<span class="hljs-string">'Item 1'</span>, <span class="hljs-string">'Item 2'</span>, <span class="hljs-string">'Item 3'</span>], datasets: [{ data: [<span class="hljs-number">10</span>, <span class="hljs-number">20</span>, <span class="hljs-number">30</span>], backgroundColor: fillPattern }] } }) } </code></pre> <p>Using pattern fills for data graphics can help viewers with vision deficiencies (e.g. color-blindness or partial sight) to <a href="http://betweentwobrackets.com/data-graphics-and-colour-vision/" target="_blank">more easily understand your data</a>.</p> <p>Using the <a href="https://github.com/ashiguruma/patternomaly" target="_blank">Patternomaly</a> library you can generate patterns to fill datasets.</p> <pre><code class="lang-javascript"><span class="hljs-keyword">var</span> chartData = { datasets: [{ data: [<span class="hljs-number">45</span>, <span class="hljs-number">25</span>, <span class="hljs-number">20</span>, <span class="hljs-number">10</span>], backgroundColor: [ pattern.draw(<span class="hljs-string">'square'</span>, <span class="hljs-string">'#ff6384'</span>), pattern.draw(<span class="hljs-string">'circle'</span>, <span class="hljs-string">'#36a2eb'</span>), pattern.draw(<span class="hljs-string">'diamond'</span>, <span class="hljs-string">'#cc65fe'</span>), pattern.draw(<span class="hljs-string">'triangle'</span>, <span class="hljs-string">'#ffce56'</span>), ] }], labels: [<span class="hljs-string">'Red'</span>, <span class="hljs-string">'Blue'</span>, <span class="hljs-string">'Purple'</span>, <span class="hljs-string">'Yellow'</span>] }; </code></pre> </section> </div> <div class="search-results"> <div class="has-results"> <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1> <ul class="search-results-list"></ul> </div> <div class="no-results"> <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1> </div> </div> </div> </div> </div> </div> <a href="options.html" class="navigation navigation-prev " aria-label="Previous page: Options"> <i class="fa fa-angle-left"></i> </a> <a href="fonts.html" class="navigation navigation-next " aria-label="Next page: Fonts"> <i class="fa fa-angle-right"></i> </a> </div> <script> var gitbook = gitbook || []; gitbook.push(function() { gitbook.page.hasChanged({"page":{"title":"Colors","level":"1.3.5","depth":2,"next":{"title":"Fonts","level":"1.3.6","depth":2,"path":"general/fonts.md","ref":"general/fonts.md","articles":[]},"previous":{"title":"Options","level":"1.3.4","depth":2,"path":"general/options.md","ref":"general/options.md","articles":[]},"dir":"ltr"},"config":{"plugins":["-lunr","-search","search-plus","anchorjs","chartjs","ga"],"root":"./docs","styles":{"website":"style.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"anchorjs":{"icon":"#","placement":"left","visible":"always"},"ga":{"configuration":"auto","token":"UA-28909194-3"},"theme-default":{"styles":{"website":"style.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false},"search-plus":{},"chartjs":{"defaults":null},"highlight":{},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2}},"theme":"default","author":"chartjs","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Chart.js documentation","gitbook":"3.2.2"},"file":{"path":"general/colors.md","mtime":"2018-03-01T21:46:31.679Z","type":"markdown"},"gitbook":{"version":"3.2.2","time":"2018-03-01T21:50:47.970Z"},"basePath":"..","book":{"language":""}}); 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