ClevelandDotPlot.svelte component

<!--
  @component
  Generates an SVG Cleveland dot plot, also known as a lollipop-chart.
 -->
<script>
  import { getContext } from 'svelte';

  const { data, xGet, yGet, yScale, zScale, config } = getContext('LayerCake');

  /**
   * @typedef {Object} Props
   * @property {number} [r=5] - The circle radius.
   */

  /** @type {Props} */
  let { r = 5 } = $props();

  let midHeight = $derived($yScale.bandwidth() / 2);
</script>

<g class="dot-plot">
  {#each $data as row}
    {@const yVal = $yGet(row)}
    {@const xVals = $xGet(row)}
    <g class="dot-row">
      <line
        x1={Math.min(...xVals)}
        y1={yVal + midHeight}
        x2={Math.max(...xVals)}
        y2={yVal + midHeight}
      ></line>

      {#each xVals as circleX, i}
        <circle cx={circleX} cy={yVal + midHeight} {r} fill={$zScale($config.x[i])}></circle>
      {/each}
    </g>
  {/each}
</g>

<style>
  line {
    stroke-width: 1px;
    stroke: #000;
  }
  circle {
    stroke: #000;
    stroke-width: 1px;
  }
</style>