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<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>
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