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Grouped column

A grouped column chart using the x2 nested dimension. x2 is a band scale whose range is one x band wide, so setting x2="fruit" positions each column inside its group with no extra code.

  • +page.svelte
  • ./_components/ColumnGrouped.svelte
  • ./_components/AxisX.svelte
  • ./_components/AxisY.svelte
  • ./_data/yearGroupsLong.js
<script>
  import { LayerCake, Svg } from 'layercake';
  import { scaleBand } from 'd3-scale';

  import ColumnGrouped from './_components/ColumnGrouped.svelte';
  import AxisX from './_components/AxisX.svelte';
  import AxisY from './_components/AxisY.svelte';

  // A flat list of rows, one per column: { year, fruit, value }
  import data from './_data/yearGroupsLong.js';

  const xKey = 'year';
  const x2Key = 'fruit';
  const yKey = 'value';

  const seriesColors = ['#ff00cc', '#00ccff', '#ffcc00'];

  // `x2="fruit"` is all it takes to position columns within each group. x2 is
  // a scaleBand by default. Its domain comes from the data and its range is
  // one x band wide. Pass `x2Scale` to customize the padding, for example
  // `x2Scale={scaleBand().paddingInner(0.1)}`. You could also skip `x2` and
  // build that band scale inside your own component.
</script>

<div class="chart-container">
  <LayerCake
    padding={{ top: 10, bottom: 20, left: 20 }}
    x={xKey}
    x2={x2Key}
    y={yKey}
    c={x2Key}
    xScale={scaleBand().paddingInner(0.1).round(true)}
    yDomain={[0, null]}
    cRange={seriesColors}
    {data}
  >
    <Svg>
      <AxisX gridlines={false} />

      <AxisY snapBaselineLabel />
      <ColumnGrouped />
    </Svg>
  </LayerCake>
</div>

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