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Histogram (variable bins)Edit

40 bins
  • index.svelte
  • ./components/Column.svelte
  • ./components/AxisX.svelte
  • ./components/AxisY.svelte
  • ./modules/thresholds.js
  • ./data/unemployment.js
<script>
  import { LayerCake, Svg } from 'layercake';
  import { histogram, extent } from 'd3-array';

  import Column from './components/Column.svelte';
  import AxisX from './components/AxisX.svelte';
  import AxisY from './components/AxisY.svelte';
  import thresholds from './modules/thresholds.js';

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

  const xKey = ['x0', 'x1'];
  const yKey = 'length';
  let binCount = 40;

  const domain = extent(data);

  $: hist = histogram()
    .domain(domain)
    .thresholds(thresholds(domain, binCount));

  $: bins = hist(data);
</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: 100%;
  }
  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
    padding={{ top: 20, right: 5, bottom: 20, left: 30 }}
    x={xKey}
    y={yKey}
    yDomain={[0, null]}
    data={bins}
  >
    <Svg>
      <AxisX
        gridlines={false}
        baseline={true}
        snapTicks={true}
      />
      <AxisY
        gridlines={false}
        ticks={3}
      />
      <Column
        fill={'#fff'}
        stroke={'#000'}
        strokeWidth={1}
      />
    </Svg>
  </LayerCake>
</div>