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Grouped column

1979
1980
1981
1982
1983
0
5
10
15

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.

This is the server-side rendered version. ssr and percentRange on <LayerCake> put the scales in percentages, so the chart renders before the browser measures it. The axes are HTML components and the marks sit in a <ScaledSvg> that stretches to fit its box. The x2 band is in percent as well, so the columns inside each group share the ScaledSvg's units.

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

  import ColumnGrouped from './_components/ColumnGrouped.svelte';
  import AxisX from './_components/AxisX.percent-range.html.svelte';
  import AxisY from './_components/AxisY.percent-range.html.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'];

  // With `percentRange` on, the x2 band is measured in percent, so the columns inside
  // each group share the ScaledSvg's units.
  // `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
    ssr
    percentRange
    padding={{ top: 10, bottom: 20, left: 20 }}
    x={xKey}
    x2={x2Key}
    y={yKey}
    c={x2Key}
    xScale={scaleBand().paddingInner(0.1)}
    yDomain={[0, null]}
    cRange={seriesColors}
    {data}
  >
    <Html>
      <AxisX gridlines={false} />
      <AxisY snapBaselineLabel />
    </Html>
    <ScaledSvg>
      <ColumnGrouped />
    </ScaledSvg>
  </LayerCake>
</div>

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