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<title>Data Decimation | Chart.js</title>
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decimation
</button><button class="code-editor-tab" data-v-2b4f0900>
data
</button><button class="code-editor-tab" data-v-2b4f0900>
setup
</button><button class="code-editor-tab" data-v-2b4f0900>
actions
</button></div> <div class="code-editor-tools" data-v-2b4f0900><!----> <a href="https://github.com/chartjs/Chart.js/blob/master/docs/samples/advanced/data-decimation.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 decimation = {
enabled: false,
algorithm: 'min-max',
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> decimation <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">enabled</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token literal-property property">algorithm</span><span class="token operator">:</span> <span class="token string">'min-max'</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 NUM_POINTS = 100000;
Utils.srand(10);
// parseISODate returns a luxon date object to work with in the samples
// We will create points every 30s starting from this point in time
const start = Utils.parseISODate('2021-04-01T00:00:00Z').toMillis();
const pointData = [];
for (let i = 0; i < NUM_POINTS; ++i) {
// Most data will be in the range [0, 20) but some rare data will be in the range [0, 100)
const max = Math.random() < 0.001 ? 100 : 20;
pointData.push({x: start + (i * 30000), y: Utils.rand(0, max)});
}
const data = {
datasets: [{
borderColor: Utils.CHART_COLORS.red,
borderWidth: 1,
data: pointData,
label: 'Large Dataset',
radius: 0,
}]
};</textarea><pre data-testid="preview" class="prism-editor__editor"><span class="token keyword">const</span> <span class="token constant">NUM_POINTS</span> <span class="token operator">=</span> <span class="token number">100000</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">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// parseISODate returns a luxon date object to work with in the samples</span>
<span class="token comment">// We will create points every 30s starting from this point in time</span>
<span class="token keyword">const</span> start <span class="token operator">=</span> Utils<span class="token punctuation">.</span><span class="token function">parseISODate</span><span class="token punctuation">(</span><span class="token string">'2021-04-01T00:00:00Z'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> pointData <span class="token operator">=</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">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 constant">NUM_POINTS</span><span class="token punctuation">;</span> <span class="token operator">++</span>i<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// Most data will be in the range [0, 20) but some rare data will be in the range [0, 100)</span>
<span class="token keyword">const</span> max <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">0.001</span> <span class="token operator">?</span> <span class="token number">100</span> <span class="token operator">:</span> <span class="token number">20</span><span class="token punctuation">;</span>
pointData<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> start <span class="token operator">+</span> <span class="token punctuation">(</span>i <span class="token operator">*</span> <span class="token number">30000</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token literal-property property">y</span><span class="token operator">:</span> Utils<span class="token punctuation">.</span><span class="token function">rand</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> max<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 keyword">const</span> data <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">data</span><span class="token operator">:</span> pointData<span class="token punctuation">,</span>
<span class="token literal-property property">label</span><span class="token operator">:</span> <span class="token string">'Large Dataset'</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 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 config = {
type: 'line',
data: data,
options: {
// Turn off animations and data parsing for performance
animation: false,
parsing: false,
interaction: {
mode: 'nearest',
axis: 'x',
intersect: false
},
plugins: {
decimation: decimation,
},
scales: {
x: {
type: 'time',
ticks: {
source: 'auto',
// Disabled rotation for performance
maxRotation: 0,
autoSkip: true,
}
}
}
}
};</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> data<span class="token punctuation">,</span>
<span class="token literal-property property">options</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token comment">// Turn off animations and data parsing for performance</span>
<span class="token literal-property property">animation</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token literal-property property">parsing</span><span class="token operator">:</span> <span class="token boolean">false</span><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">mode</span><span class="token operator">:</span> <span class="token string">'nearest'</span><span class="token punctuation">,</span>
<span class="token literal-property property">axis</span><span class="token operator">:</span> <span class="token string">'x'</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">decimation</span><span class="token operator">:</span> decimation<span class="token punctuation">,</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">'time'</span><span class="token punctuation">,</span>
<span class="token literal-property property">ticks</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">source</span><span class="token operator">:</span> <span class="token string">'auto'</span><span class="token punctuation">,</span>
<span class="token comment">// Disabled rotation for performance</span>
<span class="token literal-property property">maxRotation</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token literal-property property">autoSkip</span><span class="token operator">:</span> <span class="token boolean">true</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-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 actions = [
{
name: 'No decimation (default)',
handler(chart) {
chart.options.plugins.decimation.enabled = false;
chart.update();
}
},
{
name: 'min-max decimation',
handler(chart) {
chart.options.plugins.decimation.algorithm = 'min-max';
chart.options.plugins.decimation.enabled = true;
chart.update();
},
},
{
name: 'LTTB decimation (50 samples)',
handler(chart) {
chart.options.plugins.decimation.algorithm = 'lttb';
chart.options.plugins.decimation.enabled = true;
chart.options.plugins.decimation.samples = 50;
chart.update();
}
},
{
name: 'LTTB decimation (500 samples)',
handler(chart) {
chart.options.plugins.decimation.algorithm = 'lttb';
chart.options.plugins.decimation.enabled = true;
chart.options.plugins.decimation.samples = 500;
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>
<span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'No decimation (default)'</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>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>enabled <span class="token operator">=</span> <span class="token boolean">false</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 literal-property property">name</span><span class="token operator">:</span> <span class="token string">'min-max decimation'</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>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>algorithm <span class="token operator">=</span> <span class="token string">'min-max'</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>enabled <span class="token operator">=</span> <span class="token boolean">true</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>
<span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'LTTB decimation (50 samples)'</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>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>algorithm <span class="token operator">=</span> <span class="token string">'lttb'</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>enabled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>samples <span class="token operator">=</span> <span class="token number">50</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 literal-property property">name</span><span class="token operator">:</span> <span class="token string">'LTTB decimation (500 samples)'</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>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>algorithm <span class="token operator">=</span> <span class="token string">'lttb'</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>enabled <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
chart<span class="token punctuation">.</span>options<span class="token punctuation">.</span>plugins<span class="token punctuation">.</span>decimation<span class="token punctuation">.</span>samples <span class="token operator">=</span> <span class="token number">500</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><h2 id="docs"><a href="#docs" class="header-anchor">#</a> Docs</h2> <ul><li><a href="/docs/latest/configuration/decimation.html">Data Decimation</a></li> <li><a href="/docs/latest/charts/line.html">Line</a></li> <li><a href="/docs/latest/axes/cartesian/time.html">Time Scale</a></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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