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linear-gradient.html
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<!DOCTYPE html>
<html lang="en-US">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Linear Gradient | Chart.js</title>
<meta name="generator" content="VuePress 1.8.2">
<link rel="icon" href="/docs/3.1.0/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/3.1.0/assets/css/0.styles.1623ef7a.css" as="style"><link rel="preload" href="/docs/3.1.0/assets/js/app.0ddc5917.js" as="script"><link rel="preload" href="/docs/3.1.0/assets/js/2.47b832b0.js" as="script"><link rel="preload" href="/docs/3.1.0/assets/js/179.801e181f.js" as="script"><link rel="preload" href="/docs/3.1.0/assets/js/3.f47fb655.js" as="script"><link rel="prefetch" href="/docs/3.1.0/assets/js/10.ceebed1f.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/100.eee663a2.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/101.b9b1b068.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/102.479c4581.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/103.53ead1e1.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/104.5c7d8858.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/105.1d68e09a.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/106.92da18bd.js"><link rel="prefetch" href="/docs/3.1.0/assets/js/107.6f10ac74.js"><link rel="prefetch" 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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Bar Charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Line Charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Other charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Area charts</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Scales</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Scale Options</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Legend</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Title</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Tooltip</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Scriptable Options</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Animations</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Advanced</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/3.1.0/samples/advanced/data-decimation.html" class="sidebar-link">Data Decimation</a></li><li><a href="/docs/3.1.0/samples/advanced/progress-bar.html" class="sidebar-link">Animation Progress Bar</a></li><li><a href="/docs/3.1.0/samples/advanced/radial-gradient.html" class="sidebar-link">Radial Gradient</a></li><li><a href="/docs/3.1.0/samples/advanced/linear-gradient.html" aria-current="page" class="active sidebar-link">Linear Gradient</a></li><li><a href="/docs/3.1.0/samples/advanced/programmatic-events.html" class="sidebar-link">Programmatic Event Triggers</a></li><li><a href="/docs/3.1.0/samples/advanced/derived-axis-type.html" class="sidebar-link">Derived Axis Type</a></li><li><a href="/docs/3.1.0/samples/advanced/derived-chart-type.html" class="sidebar-link">Derived Chart Type</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="linear-gradient"><a href="#linear-gradient" class="header-anchor">#</a> Linear Gradient</h1> <div class="chart-editor" data-v-365c20ab><div class="chart-view" data-v-365c20ab><canvas></canvas></div> <div class="chart-actions" data-v-2afd21f1 data-v-365c20ab></div> <div class="code-editor" data-v-66ca8197 data-v-365c20ab><div class="code-editor-header" data-v-66ca8197><div class="code-editor-tabs" data-v-66ca8197><button class="code-editor-tab active" data-v-66ca8197>
getGradient
</button><button class="code-editor-tab" data-v-66ca8197>
config
</button><button class="code-editor-tab" data-v-66ca8197>
setup
</button><button class="code-editor-tab" data-v-66ca8197>
actions
</button></div> <div class="code-editor-tools" data-v-66ca8197><!----> <a href="https://github.com/chartjs/Chart.js/blob/master/docs/samples/advanced/linear-gradient.md" title="View on GitHub" target="_blank" class="code-editor-tool fab fa-github fa-lg" data-v-66ca8197></a></div></div> <div class="code-editor-views" data-v-66ca8197><div class="editor-textarea ps" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">let width, height, gradient;
function getGradient(ctx, chartArea) {
const chartWidth = chartArea.right - chartArea.left;
const chartHeight = chartArea.bottom - chartArea.top;
if (gradient === null || width !== chartWidth || height !== chartHeight) {
// Create the gradient because this is either the first render
// or the size of the chart has changed
width = chartWidth;
height = chartHeight;
gradient = ctx.createLinearGradient(0, chartArea.bottom, 0, chartArea.top);
gradient.addColorStop(0, Utils.CHART_COLORS.blue);
gradient.addColorStop(0.5, Utils.CHART_COLORS.yellow);
gradient.addColorStop(1, Utils.CHART_COLORS.red);
}
return gradient;
}</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">let</span> width<span class="token punctuation">,</span> height<span class="token punctuation">,</span> gradient<span class="token punctuation">;</span>
<span class="token keyword">function</span> <span class="token function">getGradient</span><span class="token punctuation">(</span><span class="token parameter">ctx<span class="token punctuation">,</span> chartArea</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> chartWidth <span class="token operator">=</span> chartArea<span class="token punctuation">.</span>right <span class="token operator">-</span> chartArea<span class="token punctuation">.</span>left<span class="token punctuation">;</span>
<span class="token keyword">const</span> chartHeight <span class="token operator">=</span> chartArea<span class="token punctuation">.</span>bottom <span class="token operator">-</span> chartArea<span class="token punctuation">.</span>top<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>gradient <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">||</span> width <span class="token operator">!==</span> chartWidth <span class="token operator">||</span> height <span class="token operator">!==</span> chartHeight<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Create the gradient because this is either the first render</span>
<span class="token comment">// or the size of the chart has changed</span>
width <span class="token operator">=</span> chartWidth<span class="token punctuation">;</span>
height <span class="token operator">=</span> chartHeight<span class="token punctuation">;</span>
gradient <span class="token operator">=</span> ctx<span class="token punctuation">.</span><span class="token function">createLinearGradient</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> chartArea<span class="token punctuation">.</span>bottom<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> chartArea<span class="token punctuation">.</span>top<span class="token punctuation">)</span><span class="token punctuation">;</span>
gradient<span class="token punctuation">.</span><span class="token function">addColorStop</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>blue<span class="token punctuation">)</span><span class="token punctuation">;</span>
gradient<span class="token punctuation">.</span><span class="token function">addColorStop</span><span class="token punctuation">(</span><span class="token number">0.5</span><span class="token punctuation">,</span> Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>yellow<span class="token punctuation">)</span><span class="token punctuation">;</span>
gradient<span class="token punctuation">.</span><span class="token function">addColorStop</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">.</span>red<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> gradient<span class="token punctuation">;</span>
<span class="token punctuation">}</span><br /></pre></div></div></div></div><div class="editor-textarea ps" style="display:none;" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const config = {
type: 'line',
data: data,
options: {
responsive: true,
plugins: {
legend: {
position: 'top',
},
}
},
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> config <span class="token operator">=</span> <span class="token punctuation">{</span>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> data<span class="token punctuation">,</span>
options<span class="token operator">:</span> <span class="token punctuation">{</span>
responsive<span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
plugins<span class="token operator">:</span> <span class="token punctuation">{</span>
legend<span class="token operator">:</span> <span class="token punctuation">{</span>
position<span class="token operator">:</span> <span class="token string">'top'</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><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><br /></pre></div></div></div></div><div class="editor-textarea ps" style="display:none;" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const DATA_COUNT = 7;
const NUMBER_CFG = {count: DATA_COUNT, min: -100, max: 100};
const labels = Utils.months({count: 7});
const data = {
labels: labels,
datasets: [
{
label: 'Dataset 1',
data: Utils.numbers(NUMBER_CFG),
borderColor: function(context) {
const chart = context.chart;
const {ctx, chartArea} = chart;
if (!chartArea) {
// This case happens on initial chart load
return null;
}
return getGradient(ctx, chartArea);
},
},
]
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> <span class="token constant">DATA_COUNT</span> <span class="token operator">=</span> <span class="token number">7</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token constant">NUMBER_CFG</span> <span class="token operator">=</span> <span class="token punctuation">{</span>count<span class="token operator">:</span> <span class="token constant">DATA_COUNT</span><span class="token punctuation">,</span> min<span class="token operator">:</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span> max<span class="token operator">:</span> <span class="token number">100</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> labels <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token function">months</span><span class="token punctuation">(</span><span class="token punctuation">{</span>count<span class="token operator">:</span> <span class="token number">7</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> data <span class="token operator">=</span> <span class="token punctuation">{</span>
labels<span class="token operator">:</span> labels<span class="token punctuation">,</span>
datasets<span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
label<span class="token operator">:</span> <span class="token string">'Dataset 1'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token function">numbers</span><span class="token punctuation">(</span><span class="token constant">NUMBER_CFG</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
<span class="token function-variable function">borderColor</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">context</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> chart <span class="token operator">=</span> context<span class="token punctuation">.</span>chart<span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token punctuation">{</span>ctx<span class="token punctuation">,</span> chartArea<span class="token punctuation">}</span> <span class="token operator">=</span> chart<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>chartArea<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// This case happens on initial chart load</span>
<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">return</span> <span class="token function">getGradient</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> chartArea<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><span class="token punctuation">,</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span><br /></pre></div></div></div></div><div class="editor-textarea ps" style="display:none;" data-v-05f11386 data-v-66ca8197><div class="editor-textarea-content" data-v-05f11386><div class="prism-editor-wrapper" data-v-05f11386><div class="prism-editor__container"><textarea spellCheck="false" autocapitalize="off" autocomplete="off" autocorrect="off" data-gramm="false" placeholder="" data-testid="textarea" class="prism-editor__textarea">const actions = [
{
name: 'Randomize',
handler(chart) {
chart.data.datasets.forEach(dataset => {
dataset.data = Utils.numbers({count: chart.data.labels.length, min: -100, max: 100});
});
chart.update();
}
},
{
name: 'Add Data',
handler(chart) {
const data = chart.data;
if (data.datasets.length > 0) {
data.labels = Utils.months({count: data.labels.length + 1});
for (var index = 0; index < data.datasets.length; ++index) {
data.datasets[index].data.push(Utils.rand(-100, 100));
}
chart.update();
}
}
},
{
name: 'Remove Data',
handler(chart) {
chart.data.labels.splice(-1, 1); // remove the label first
chart.data.datasets.forEach(dataset => {
dataset.data.pop();
});
chart.update();
}
}
];</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> actions <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
name<span class="token operator">:</span> <span class="token string">'Randomize'</span><span class="token punctuation">,</span>
<span class="token function">handler</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>datasets<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">dataset</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
dataset<span class="token punctuation">.</span>data <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token function">numbers</span><span class="token punctuation">(</span><span class="token punctuation">{</span>count<span class="token operator">:</span> chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>labels<span class="token punctuation">.</span>length<span class="token punctuation">,</span> min<span class="token operator">:</span> <span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</span> max<span class="token operator">:</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><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span><span class="token function">update</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><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
name<span class="token operator">:</span> <span class="token string">'Add Data'</span><span class="token punctuation">,</span>
<span class="token function">handler</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> data <span class="token operator">=</span> chart<span class="token punctuation">.</span>data<span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>data<span class="token punctuation">.</span>datasets<span class="token punctuation">.</span>length <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
data<span class="token punctuation">.</span>labels <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token function">months</span><span class="token punctuation">(</span><span class="token punctuation">{</span>count<span class="token operator">:</span> data<span class="token punctuation">.</span>labels<span class="token punctuation">.</span>length <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> index <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> index <span class="token operator"><</span> data<span class="token punctuation">.</span>datasets<span class="token punctuation">.</span>length<span class="token punctuation">;</span> <span class="token operator">++</span>index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
data<span class="token punctuation">.</span>datasets<span class="token punctuation">[</span>index<span class="token punctuation">]</span><span class="token punctuation">.</span>data<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>Utils<span class="token punctuation">.</span><span class="token function">rand</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">100</span><span class="token punctuation">,</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>
chart<span class="token punctuation">.</span><span class="token function">update</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>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
name<span class="token operator">:</span> <span class="token string">'Remove Data'</span><span class="token punctuation">,</span>
<span class="token function">handler</span><span class="token punctuation">(</span><span class="token parameter">chart</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>labels<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// remove the label first</span>
chart<span class="token punctuation">.</span>data<span class="token punctuation">.</span>datasets<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token parameter">dataset</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
dataset<span class="token punctuation">.</span>data<span class="token punctuation">.</span><span class="token function">pop</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><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span><span class="token function">update</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>
<span class="token punctuation">]</span><span class="token punctuation">;</span><br /></pre></div></div></div></div></div></div></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">4/2/2021, 8:04:39 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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