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Documentation for Layer Cake v10, before Svelte 5 runes. Current docs at layercake.graphics

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Nested circle pack

A nested circle pack using d3-hierarchy. Each row names its parent, so the parentKey prop builds the hierarchy. Circles are drawn deepest last and labels appear on hover. Compare the flat version.

  • +page.svelte
  • ./_components/CirclePack.html.svelte
  • ./_data/familyTree.csv
<script>
  import { LayerCake, Html } from 'layercake';

  import CirclePack from './_components/CirclePack.html.svelte';

  // The CSV rows are parsed, and their numbers typed, by @rollup/plugin-dsv. See vite.config.js
  import data from './_data/familyTree.csv';

  const idKey = 'name';
  const parentKey = 'parent';
</script>

<div class="chart-container">
  <LayerCake padding={{ bottom: 20, left: 30 }} {data}>
    <Html>
      <!-- Draw the deepest circles last so they sit on top, and show labels only on hover -->
      <CirclePack
        {idKey}
        {parentKey}
        spacing={5}
        sortBy={(a, b) => b.depth - a.depth}
        isLabelVisible={() => false}
        stroke="#00bbff"
      />
    </Html>
  </LayerCake>
</div>

<style>
  /* Give the wrapper a width and height. LayerCake fills it. */
  .chart-container {
    width: 100%;
    height: 250px;
  }
</style>