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radial-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>Radial 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">
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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" aria-current="page" class="active sidebar-link">Radial Gradient</a></li><li><a href="/docs/3.1.0/samples/advanced/linear-gradient.html" class="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="radial-gradient"><a href="#radial-gradient" class="header-anchor">#</a> Radial 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>
createRadialGradient3
</button><button class="code-editor-tab" data-v-66ca8197>
config
</button><button class="code-editor-tab" data-v-66ca8197>
data
</button><button class="code-editor-tab" data-v-66ca8197>
setup
</button></div> <div class="code-editor-tools" data-v-66ca8197><!----> <a href="https://github.com/chartjs/Chart.js/blob/master/docs/samples/advanced/radial-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">function createRadialGradient3(context, c1, c2, c3) {
const chartArea = context.chart.chartArea;
if (!chartArea) {
// This case happens on initial chart load
return null;
}
const chartWidth = chartArea.right - chartArea.left;
const chartHeight = chartArea.bottom - chartArea.top;
if (width !== chartWidth || height !== chartHeight) {
cache.clear();
}
var gradient = cache.get(c1 + c2 + c3);
if (!gradient) {
// Create the gradient because this is either the first render
// or the size of the chart has changed
width = chartWidth;
height = chartHeight;
const centerX = (chartArea.left + chartArea.right) / 2;
const centerY = (chartArea.top + chartArea.bottom) / 2;
const r = Math.min(
(chartArea.right - chartArea.left) / 2,
(chartArea.bottom - chartArea.top) / 2
);
var ctx = context.chart.ctx;
gradient = ctx.createRadialGradient(centerX, centerY, 0, centerX, centerY, r);
gradient.addColorStop(0, c1);
gradient.addColorStop(0.5, c2);
gradient.addColorStop(1, c3);
cache.set(c1 + c2 + c3, gradient);
}
return gradient;
}</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">function</span> <span class="token function">createRadialGradient3</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> c1<span class="token punctuation">,</span> c2<span class="token punctuation">,</span> c3</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> chartArea <span class="token operator">=</span> context<span class="token punctuation">.</span>chart<span class="token punctuation">.</span>chartArea<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">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>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>
cache<span class="token punctuation">.</span><span class="token function">clear</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">var</span> gradient <span class="token operator">=</span> cache<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>c1 <span class="token operator">+</span> c2 <span class="token operator">+</span> c3<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>gradient<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>
<span class="token keyword">const</span> centerX <span class="token operator">=</span> <span class="token punctuation">(</span>chartArea<span class="token punctuation">.</span>left <span class="token operator">+</span> chartArea<span class="token punctuation">.</span>right<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> centerY <span class="token operator">=</span> <span class="token punctuation">(</span>chartArea<span class="token punctuation">.</span>top <span class="token operator">+</span> chartArea<span class="token punctuation">.</span>bottom<span class="token punctuation">)</span> <span class="token operator">/</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> r <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>
<span class="token punctuation">(</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 operator">/</span> <span class="token number">2</span><span class="token punctuation">,</span>
<span class="token punctuation">(</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 operator">/</span> <span class="token number">2</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> ctx <span class="token operator">=</span> context<span class="token punctuation">.</span>chart<span class="token punctuation">.</span>ctx<span class="token punctuation">;</span>
gradient <span class="token operator">=</span> ctx<span class="token punctuation">.</span><span class="token function">createRadialGradient</span><span class="token punctuation">(</span>centerX<span class="token punctuation">,</span> centerY<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> centerX<span class="token punctuation">,</span> centerY<span class="token punctuation">,</span> r<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> c1<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> c2<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> c3<span class="token punctuation">)</span><span class="token punctuation">;</span>
cache<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>c1 <span class="token operator">+</span> c2 <span class="token operator">+</span> c3<span class="token punctuation">,</span> gradient<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: 'polarArea',
data: data,
options: {
plugins: {
legend: false,
tooltip: false,
},
elements: {
arc: {
backgroundColor: function(context) {
let c = colors[context.dataIndex];
if (!c) {
return;
}
if (context.active) {
c = helpers.getHoverColor(c);
}
const mid = helpers.color(c).desaturate(0.2).darken(0.2).rgbString();
const start = helpers.color(c).lighten(0.2).rotate(270).rgbString();
const end = helpers.color(c).lighten(0.1).rgbString();
return createRadialGradient3(context, start, mid, end);
},
}
}
}
};</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">'polarArea'</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>
plugins<span class="token operator">:</span> <span class="token punctuation">{</span>
legend<span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
tooltip<span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
elements<span class="token operator">:</span> <span class="token punctuation">{</span>
arc<span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token function-variable function">backgroundColor</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">let</span> c <span class="token operator">=</span> colors<span class="token punctuation">[</span>context<span class="token punctuation">.</span>dataIndex<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>c<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>context<span class="token punctuation">.</span>active<span class="token punctuation">)</span> <span class="token punctuation">{</span>
c <span class="token operator">=</span> helpers<span class="token punctuation">.</span><span class="token function">getHoverColor</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> mid <span class="token operator">=</span> helpers<span class="token punctuation">.</span><span class="token function">color</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">desaturate</span><span class="token punctuation">(</span><span class="token number">0.2</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">darken</span><span class="token punctuation">(</span><span class="token number">0.2</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rgbString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> start <span class="token operator">=</span> helpers<span class="token punctuation">.</span><span class="token function">color</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">lighten</span><span class="token punctuation">(</span><span class="token number">0.2</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rotate</span><span class="token punctuation">(</span><span class="token number">270</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rgbString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> end <span class="token operator">=</span> helpers<span class="token punctuation">.</span><span class="token function">color</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">lighten</span><span class="token punctuation">(</span><span class="token number">0.1</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">rgbString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token function">createRadialGradient3</span><span class="token punctuation">(</span>context<span class="token punctuation">,</span> start<span class="token punctuation">,</span> mid<span class="token punctuation">,</span> end<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">function generateData() {
return Utils.numbers({
count: DATA_COUNT,
min: 0,
max: 100
});
}
const data = {
labels: Utils.months({count: DATA_COUNT}),
datasets: [{
data: generateData()
}]
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">function</span> <span class="token function">generateData</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</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> <span class="token constant">DATA_COUNT</span><span class="token punctuation">,</span>
min<span class="token operator">:</span> <span class="token number">0</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 keyword">const</span> data <span class="token operator">=</span> <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> <span class="token constant">DATA_COUNT</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
datasets<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
data<span class="token operator">:</span> <span class="token function">generateData</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 = 5;
Utils.srand(110);
const chartColors = Utils.CHART_COLORS;
const colors = [chartColors.red, chartColors.orange, chartColors.yellow, chartColors.green, chartColors.blue];
const cache = new Map();
let width = null;
let height = null;
const actions = [
{
name: 'Randomize',
handler(chart) {
chart.data.datasets.forEach(dataset => {
dataset.data = generateData();
});
chart.update();
}
},
];</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">5</span><span class="token punctuation">;</span>
Utils<span class="token punctuation">.</span><span class="token function">srand</span><span class="token punctuation">(</span><span class="token number">110</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> chartColors <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token constant">CHART_COLORS</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> colors <span class="token operator">=</span> <span class="token punctuation">[</span>chartColors<span class="token punctuation">.</span>red<span class="token punctuation">,</span> chartColors<span class="token punctuation">.</span>orange<span class="token punctuation">,</span> chartColors<span class="token punctuation">.</span>yellow<span class="token punctuation">,</span> chartColors<span class="token punctuation">.</span>green<span class="token punctuation">,</span> chartColors<span class="token punctuation">.</span>blue<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> cache <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Map</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> width <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> height <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<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> <span class="token function">generateData</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><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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