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Histogram (variable bins)Edit

40 bins
1.6
5.32
9.04
12.76
16.48
20.2
23.92
0
200
400
  • +page.svelte
  • ./_components/Column.svelte
  • ./_components/AxisX.html.svelte
  • ./_components/AxisY.html.svelte
  • ./_modules/calcThresholds.js
  • ./_data/unemployment.js
<script>
  import { LayerCake, ScaledSvg, Html, takeEvery } from 'layercake';
  import { extent, bin } from 'd3-array';
  import { scaleBand } from 'd3-scale';
  import { format } from 'd3-format';

  import Column from './_components/Column.svelte';
  import AxisX from './_components/AxisX.html.svelte';
  import AxisY from './_components/AxisY.html.svelte';

  import calcThresholds from './_modules/calcThresholds.js';

  import data from './_data/unemployment.js';

  const f = format('.2f');

  let binCount = 40;

  const xKey = ['x0', 'x1'];
  const yKey = 'length';

  const domain = extent(data);

  $: steps = calcThresholds(domain, binCount);
  $: hist = bin()
    .domain(domain)
    .thresholds(steps);

  $: slimSteps = takeEvery(steps, 7);
</script>

<style>
  /*
    The wrapper div needs to have an explicit width and height in CSS.
    It can also be a flexbox child or CSS grid element.
    The point being it needs dimensions since the <LayerCake> element will
    expand to fill it.
  */
  .chart-container {
    width: 100%;
    height: 250px;
  }

  input {
    height: auto;
  }
</style>

<div class="input-container" style="position: absolute;right:10px;z-index: 9;">
  <input
    style="margin:0;"
    type="range"
    min="4"
    max="100"
    step="4"
    bind:value={binCount}
  /> <span class="counter-container" style="display:inline-block;vertical-align:top;width: 70px;text-align:right;">{binCount} bins</span>
</div>

<div class="chart-container">
  <LayerCake
    ssr={true}
    percentRange={true}
    padding={{ top: 20, right: 5, bottom: 20, left: 31 }}
    x={xKey}
    y={yKey}
    xDomain={steps}
    xScale={scaleBand().paddingInner(0)}
    yDomain={[0, null]}
    data={hist(data)}
  >
    <Html>
      <AxisX
        gridlines={false}
        baseline={true}
        ticks={slimSteps}
        formatTick={d => +f(d)}
      />
      <AxisY
        gridlines={false}
        ticks={3}
      />
    </Html>
    <ScaledSvg>
      <Column
        fill={'#fff'}
        stroke={'#000'}
        strokeWidth={1}
      />
    </ScaledSvg>
  </LayerCake>
</div>