MultiLine.svelte component

<!--
  @component
  Generates an SVG multi-series line chart. It expects your data to be an array of objects, each with a `values` key that is an array of data objects.
 -->
<script>
  import { getContext } from 'svelte';
  import { line, curveLinear } from 'd3-shape';

  const { data, xGet, yGet, zGet } = getContext('LayerCake');

  /** @type {Function} [curve=curveLinear] - An optional D3 interpolation function. See [d3-shape](https://github.com/d3/d3-shape#curves) for options. Pass this function in uncalled, i.e. without the open-close parentheses. */
  export let curve = curveLinear

  $: path = line()
    .x($xGet)
    .y($yGet)
    .curve(curve)
    // .defined($y)
</script>

<g class="line-group">
  {#each $data as group}
    <path
      class='path-line'
      d='{path(group.values)}'
      stroke="{$zGet(group)}"
    ></path>
  {/each}
</g>

<style>
  .path-line {
    fill: none;
    stroke-linejoin: round;
    stroke-linecap: round;
    stroke-width: 3px;
  }
</style>