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<!DOCTYPE html>
<html lang="en">
<head>
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<meta charset="utf-8" />
<title>Chord diagram in d3.js</title>
<meta
name="viewport"
content="width=device-width, initial-scale=1, shrink-to-fit=no"
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<meta
name="description"
content="Building chord diagrams in d3.js: simple and customized examples with reproducible code."
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<meta
name="keywords"
content="Data,Dataviz,Datavisualization,Javascript,D3,D3.js,chord diagram"
/>
<meta name="author" content="Yan Holtz" />
<link rel="icon" href="img/logo/D3_single_small.png" />
<meta
property="og:title"
content="Chord diagram – The D3 Graph Gallery"
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<header class="masthead" style="padding-top: 150px; padding-bottom: 80px">
<div class="textlanding">
<h1>Chord Diagram</h1>
<hr class="short_hr" />
<br />
<ul class="list-inline social-buttons">
<li class="list-inline-item">
<a href="https://twitter.com/R_Graph_Gallery">
<i class="fa fa-twitter"></i>
</a>
</li>
<li class="list-inline-item social-buttons">
<a href="https://github.com/holtzy">
<i class="fa fa-github" style="color: white"></i>
</a>
</li>
<li class="list-inline-item social-buttons">
<a href="https://www.linkedin.com/in/yan-holtz-2477534a/">
<i class="fa fa-linkedin"></i>
</a>
</li>
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<a href="https://www.yan-holtz.com">
<i class="fa fa-home"></i>
</a>
</li>
</ul>
<br /><br />
<p style="max-width: 700px; margin: auto">
This is the
<a href="https://www.data-to-viz.com/graph/chord.html"
>Chord diagram</a
>
section of the gallery. If you want to know more about this kind of
chart, visit
<a href="https://www.data-to-viz.com/graph/chord.html"
>data-to-viz.com</a
>. If you're looking for a simple way to implement it in d3.js, pick
an example below.
</p>
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</header>
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<div class="mySeryTitle">A few notes on chord</div>
<hr />
<p>
Chord diagram is probably one of the most difficult graph to build
with d3. Here are a few reminders:
</p>
<ul>
<li>
Everything relies on the
<a href="https://github.com/d3/d3-chord">d3.chord()</a> function.
This function takes as input a square matrix of flow. The output is
an array of chords.
</li>
<li>
Each chord as a source and a target. For each group it gives info
like the angle of start and end, the flow value, the node index,
</li>
<li>
It's important to understand that a chord diagram is composed by 2
elements: the links, and the nodes. Nodes are like a donut plot
</li>
<li>
The nodes are drawn using the arc() function. The links with the
ribbon function().
</li>
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<div class="portfolio-hover-content">
<p>Most basic</p>
<hr />
<p class="explanation_portfolio">
The most basic chord diagram you can do in d3.js. Keeping
only the core code.
</p>
</div>
</div>
<img class="img-fluid" src="img/graph/chord_basic.png" alt="" />
</a>
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<a class="portfolio-link" href="graph/chord_axis_labels.html">
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<p>Add ticks and tick labels</p>
<hr />
<p class="explanation_portfolio">
Same graphic as before, just adding tick and ticks labels
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<img
class="img-fluid"
src="img/graph/chord_axis_labels.png"
alt=""
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<p>Control colors</p>
<hr />
<p class="explanation_portfolio">
You probably want to set a color for each group, and colors
links according to their source / target. Here is how.
</p>
</div>
</div>
<img class="img-fluid" src="img/graph/chord_colors.png" alt="" />
</a>
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<p>Storytelling with Chord Diagram</p>
<hr />
<p class="explanation_portfolio">
Nadieh Bremer tells us about the switching behavior between
phone brands through a chord diagram. A must see example of
data story telling.
</p>
</div>
</div>
<img
class="img-fluid"
src="img/graph/block_chord_bremer.png"
alt=""
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<p class="mySeryTitle">Related chart types</p>
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<a class="portfolio-link" href="chord.html">
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<img class="img-fluid" src="img/section/Chord150.png" alt="" />
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<div class="captionPortfolio">Chord diagram</div>
</div>
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<a class="portfolio-link" href="network.html">
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<div class="captionPortfolio">Arc diagram</div>
</div>
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