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progressive-line.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>Progressive Line | Chart.js</title>
<meta name="generator" content="VuePress 1.9.9">
<link rel="icon" href="/docs/latest/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/latest/assets/css/0.styles.6dc2f403.css" as="style"><link rel="preload" href="/docs/latest/assets/js/app.1775731d.js" as="script"><link rel="preload" href="/docs/latest/assets/js/2.2c2b1036.js" as="script"><link rel="preload" href="/docs/latest/assets/js/203.c0a58e57.js" as="script"><link rel="preload" href="/docs/latest/assets/js/3.bb127fce.js" as="script"><link rel="prefetch" href="/docs/latest/assets/js/10.ba172174.js"><link rel="prefetch" href="/docs/latest/assets/js/100.559bdb31.js"><link rel="prefetch" href="/docs/latest/assets/js/101.734a357a.js"><link rel="prefetch" href="/docs/latest/assets/js/102.e53ce872.js"><link rel="prefetch" href="/docs/latest/assets/js/103.9940e4fa.js"><link rel="prefetch" href="/docs/latest/assets/js/104.469f66c7.js"><link rel="prefetch" href="/docs/latest/assets/js/105.5ae465af.js"><link rel="prefetch" href="/docs/latest/assets/js/106.716d6eac.js"><link rel="prefetch" href="/docs/latest/assets/js/107.0833c00c.js"><link 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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><a href="/docs/latest/samples/information.html" class="sidebar-link">Chart.js Samples</a></li><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>Subtitle</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 open"><span>Animations</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/docs/latest/samples/animations/delay.html" class="sidebar-link">Delay</a></li><li><a href="/docs/latest/samples/animations/drop.html" class="sidebar-link">Drop</a></li><li><a href="/docs/latest/samples/animations/loop.html" class="sidebar-link">Loop</a></li><li><a href="/docs/latest/samples/animations/progressive-line.html" aria-current="page" class="active sidebar-link">Progressive Line</a></li><li><a href="/docs/latest/samples/animations/progressive-line-easing.html" class="sidebar-link">Progressive Line With Easing</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Advanced</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Plugins</span> <span class="arrow right"></span></p> <!----></section></li><li><a href="/docs/latest/samples/utils.html" class="sidebar-link">Utils</a></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="progressive-line"><a href="#progressive-line" class="header-anchor">#</a> Progressive Line</h1> <div class="chart-editor" data-v-409fe714><div class="chart-view" data-v-409fe714><canvas></canvas></div> <div class="chart-actions" data-v-6c4d3f30 data-v-409fe714></div> <div class="code-editor" data-v-2b4f0900 data-v-409fe714><div class="code-editor-header" data-v-2b4f0900><div class="code-editor-tabs" data-v-2b4f0900><button class="code-editor-tab active" data-v-2b4f0900>
config
</button><button class="code-editor-tab" data-v-2b4f0900>
animation
</button><button class="code-editor-tab" data-v-2b4f0900>
data
</button></div> <div class="code-editor-tools" data-v-2b4f0900><!----> <a href="https://github.com/chartjs/Chart.js/blob/master/docs/samples/animations/progressive-line.md" title="View on GitHub" target="_blank" class="code-editor-tool fab fa-github fa-lg" data-v-2b4f0900></a></div></div> <div class="code-editor-views" data-v-2b4f0900><div class="editor-textarea ps" data-v-d2a140a2 data-v-2b4f0900><div class="editor-textarea-content" data-v-d2a140a2><div class="prism-editor-wrapper" data-v-d2a140a2><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: {
datasets: [{
borderColor: Utils.CHART_COLORS.red,
borderWidth: 1,
radius: 0,
data: data,
},
{
borderColor: Utils.CHART_COLORS.blue,
borderWidth: 1,
radius: 0,
data: data2,
}]
},
options: {
animation,
interaction: {
intersect: false
},
plugins: {
legend: false
},
scales: {
x: {
type: 'linear'
}
}
}
};</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>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">datasets</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
<span class="token literal-property property">borderColor</span><span class="token operator">:</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 literal-property property">borderWidth</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token literal-property property">radius</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> data<span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
<span class="token literal-property property">borderColor</span><span class="token operator">:</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 literal-property property">borderWidth</span><span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
<span class="token literal-property property">radius</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token literal-property property">data</span><span class="token operator">:</span> data2<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 literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
animation<span class="token punctuation">,</span>
<span class="token literal-property property">interaction</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">intersect</span><span class="token operator">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token literal-property property">plugins</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">legend</span><span class="token operator">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token literal-property property">scales</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">x</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'linear'</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-d2a140a2 data-v-2b4f0900><div class="editor-textarea-content" data-v-d2a140a2><div class="prism-editor-wrapper" data-v-d2a140a2><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 totalDuration = 10000;
const delayBetweenPoints = totalDuration / data.length;
const previousY = (ctx) => ctx.index === 0 ? ctx.chart.scales.y.getPixelForValue(100) : ctx.chart.getDatasetMeta(ctx.datasetIndex).data[ctx.index - 1].getProps(['y'], true).y;
const animation = {
x: {
type: 'number',
easing: 'linear',
duration: delayBetweenPoints,
from: NaN, // the point is initially skipped
delay(ctx) {
if (ctx.type !== 'data' || ctx.xStarted) {
return 0;
}
ctx.xStarted = true;
return ctx.index * delayBetweenPoints;
}
},
y: {
type: 'number',
easing: 'linear',
duration: delayBetweenPoints,
from: previousY,
delay(ctx) {
if (ctx.type !== 'data' || ctx.yStarted) {
return 0;
}
ctx.yStarted = true;
return ctx.index * delayBetweenPoints;
}
}
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> totalDuration <span class="token operator">=</span> <span class="token number">10000</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> delayBetweenPoints <span class="token operator">=</span> totalDuration <span class="token operator">/</span> data<span class="token punctuation">.</span>length<span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token function-variable function">previousY</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">ctx</span><span class="token punctuation">)</span> <span class="token operator">=></span> ctx<span class="token punctuation">.</span>index <span class="token operator">===</span> <span class="token number">0</span> <span class="token operator">?</span> ctx<span class="token punctuation">.</span>chart<span class="token punctuation">.</span>scales<span class="token punctuation">.</span>y<span class="token punctuation">.</span><span class="token function">getPixelForValue</span><span class="token punctuation">(</span><span class="token number">100</span><span class="token punctuation">)</span> <span class="token operator">:</span> ctx<span class="token punctuation">.</span>chart<span class="token punctuation">.</span><span class="token function">getDatasetMeta</span><span class="token punctuation">(</span>ctx<span class="token punctuation">.</span>datasetIndex<span class="token punctuation">)</span><span class="token punctuation">.</span>data<span class="token punctuation">[</span>ctx<span class="token punctuation">.</span>index <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">getProps</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token string">'y'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">.</span>y<span class="token punctuation">;</span>
<span class="token keyword">const</span> animation <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">x</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'number'</span><span class="token punctuation">,</span>
<span class="token literal-property property">easing</span><span class="token operator">:</span> <span class="token string">'linear'</span><span class="token punctuation">,</span>
<span class="token literal-property property">duration</span><span class="token operator">:</span> delayBetweenPoints<span class="token punctuation">,</span>
<span class="token literal-property property">from</span><span class="token operator">:</span> <span class="token number">NaN</span><span class="token punctuation">,</span> <span class="token comment">// the point is initially skipped</span>
<span class="token function">delay</span><span class="token punctuation">(</span><span class="token parameter">ctx</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ctx<span class="token punctuation">.</span>type <span class="token operator">!==</span> <span class="token string">'data'</span> <span class="token operator">||</span> ctx<span class="token punctuation">.</span>xStarted<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
ctx<span class="token punctuation">.</span>xStarted <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> ctx<span class="token punctuation">.</span>index <span class="token operator">*</span> delayBetweenPoints<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token literal-property property">y</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">type</span><span class="token operator">:</span> <span class="token string">'number'</span><span class="token punctuation">,</span>
<span class="token literal-property property">easing</span><span class="token operator">:</span> <span class="token string">'linear'</span><span class="token punctuation">,</span>
<span class="token literal-property property">duration</span><span class="token operator">:</span> delayBetweenPoints<span class="token punctuation">,</span>
<span class="token literal-property property">from</span><span class="token operator">:</span> previousY<span class="token punctuation">,</span>
<span class="token function">delay</span><span class="token punctuation">(</span><span class="token parameter">ctx</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>ctx<span class="token punctuation">.</span>type <span class="token operator">!==</span> <span class="token string">'data'</span> <span class="token operator">||</span> ctx<span class="token punctuation">.</span>yStarted<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
ctx<span class="token punctuation">.</span>yStarted <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> ctx<span class="token punctuation">.</span>index <span class="token operator">*</span> delayBetweenPoints<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-d2a140a2 data-v-2b4f0900><div class="editor-textarea-content" data-v-d2a140a2><div class="prism-editor-wrapper" data-v-d2a140a2><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 = [];
const data2 = [];
let prev = 100;
let prev2 = 80;
for (let i = 0; i < 1000; i++) {
prev += 5 - Math.random() * 10;
data.push({x: i, y: prev});
prev2 += 5 - Math.random() * 10;
data2.push({x: i, y: prev2});
}</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> data <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> data2 <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> prev <span class="token operator">=</span> <span class="token number">100</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> prev2 <span class="token operator">=</span> <span class="token number">80</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">1000</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
prev <span class="token operator">+=</span> <span class="token number">5</span> <span class="token operator">-</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token number">10</span><span class="token punctuation">;</span>
data<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token literal-property property">x</span><span class="token operator">:</span> i<span class="token punctuation">,</span> <span class="token literal-property property">y</span><span class="token operator">:</span> prev<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
prev2 <span class="token operator">+=</span> <span class="token number">5</span> <span class="token operator">-</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">*</span> <span class="token number">10</span><span class="token punctuation">;</span>
data2<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token literal-property property">x</span><span class="token operator">:</span> i<span class="token punctuation">,</span> <span class="token literal-property property">y</span><span class="token operator">:</span> prev2<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><h2 id="api"><a href="#api" class="header-anchor">#</a> Api</h2> <ul><li><a href="/docs/latest/api/classes/Chart.html">Chart</a> <ul><li><a href="/docs/latest/api/classes/Chart.html#getdatasetmeta"><code>getDatasetMeta</code></a></li></ul></li> <li><a href="/docs/latest/api/classes/Scale.html">Scale</a> <ul><li><a href="/docs/latest/api/classes/Scale.html#getpixelforvalue"><code>getPixelForValue</code></a></li></ul></li></ul> <h2 id="docs"><a href="#docs" class="header-anchor">#</a> Docs</h2> <ul><li><a href="/docs/latest/configuration/animations.html">Animations</a> <ul><li><a href="/docs/latest/configuration/animations.html#animation">animation</a> <ul><li><code>delay</code></li> <li><code>duration</code></li> <li><code>easing</code></li> <li><code>loop</code></li></ul></li></ul></li> <li><a href="/docs/latest/charts/line.html">Line</a></li> <li><a href="/docs/latest/general/options.html">Options</a> <ul><li><a href="/docs/latest/general/options.html#scriptable-options">Scriptable Options</a> <ul><li><a href="/docs/latest/general/options.html#data">Data Context</a></li></ul></li></ul></li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">4/15/2025, 1:19:05 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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