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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 1.8.2">
<link rel="icon" href="/docs/3.5.0/favicon.ico">
<meta name="description" content="Open source HTML5 Charts for your website">
<link rel="preload" href="/docs/3.5.0/assets/css/0.styles.bc51b73f.css" as="style"><link rel="preload" href="/docs/3.5.0/assets/js/app.59cb20f3.js" as="script"><link rel="preload" href="/docs/3.5.0/assets/js/2.413130e4.js" as="script"><link rel="preload" href="/docs/3.5.0/assets/js/187.e192c538.js" as="script"><link rel="preload" href="/docs/3.5.0/assets/js/3.e2fd7cce.js" as="script"><link rel="prefetch" href="/docs/3.5.0/assets/js/10.a355b908.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/100.e5cb1cb4.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/101.1c2b3c1c.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/102.059fbc45.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/103.64e29596.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/104.c17d03e3.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/105.0254d1a7.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/106.1dd93b6c.js"><link rel="prefetch" href="/docs/3.5.0/assets/js/107.536f6a2c.js"><link rel="prefetch" 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config
</button><button class="code-editor-tab" data-v-66ca8197>
animation
</button><button class="code-editor-tab" data-v-66ca8197>
data
</button></div> <div class="code-editor-tools" data-v-66ca8197><!----> <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-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">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>
type<span class="token operator">:</span> <span class="token string">'line'</span><span class="token punctuation">,</span>
data<span class="token operator">:</span> <span class="token punctuation">{</span>
datasets<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span>
borderColor<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>
borderWidth<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
radius<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
data<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>
borderColor<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>
borderWidth<span class="token operator">:</span> <span class="token number">1</span><span class="token punctuation">,</span>
radius<span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
data<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>
options<span class="token operator">:</span> <span class="token punctuation">{</span>
animation<span class="token punctuation">,</span>
interaction<span class="token operator">:</span> <span class="token punctuation">{</span>
intersect<span class="token operator">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</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><span class="token punctuation">,</span>
scales<span class="token operator">:</span> <span class="token punctuation">{</span>
x<span class="token operator">:</span> <span class="token punctuation">{</span>
type<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-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 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>
x<span class="token operator">:</span> <span class="token punctuation">{</span>
type<span class="token operator">:</span> <span class="token string">'number'</span><span class="token punctuation">,</span>
easing<span class="token operator">:</span> <span class="token string">'linear'</span><span class="token punctuation">,</span>
duration<span class="token operator">:</span> delayBetweenPoints<span class="token punctuation">,</span>
from<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>
y<span class="token operator">:</span> <span class="token punctuation">{</span>
type<span class="token operator">:</span> <span class="token string">'number'</span><span class="token punctuation">,</span>
easing<span class="token operator">:</span> <span class="token string">'linear'</span><span class="token punctuation">,</span>
duration<span class="token operator">:</span> delayBetweenPoints<span class="token punctuation">,</span>
from<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-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 = [];
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>x<span class="token operator">:</span> i<span class="token punctuation">,</span> y<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>x<span class="token operator">:</span> i<span class="token punctuation">,</span> y<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></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">7/25/2021, 11:56:33 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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