AxisYRight.percent-range.html.svelte component

<!--
  @component
  Generates an HTML y-axis on the right-hand side. This component is also configured to detect if your y-scale is an ordinal scale. If so, it will place the markers in the middle of the bandwidth.
 -->
 <script>
  import { getContext } from 'svelte';

  const { xRange, yScale, width } = getContext('LayerCake');

  /** @type {Boolean} [tickMarks=true] - Show marks next to the tick label. */
  export let tickMarks = true;

  /** @type {String} [labelPosition='even'] - Whether the label sits even with its value ('even') or sits on top ('above') the tick mark. Default is 'even'. */
  export let labelPosition = 'even';

  /** @type {Boolean} [snapBaselineLabel=false] - When labelPosition='even', adjust the lowest label so that it sits above the tick mark. */
  export let snapBaselineLabel = false;

  /** @type {Boolean} [gridlines=true] - When labelPosition='even', adjust the lowest label so that it sits above the tick mark. */
  export let gridlines = true;

  /** @type {Number} [tickMarkLength=undefined] - The length of the tick mark. If not set, becomes the length of the widest tick. */
  export let tickMarkLength = undefined;

  /** @type {Function} [format=d => d] - A function that passes the current tick value and expects a nicely formatted value in return. */
  export let format = d => d ;

  /** @type {Number|Array|Function} [ticks=4] - If this is a number, it passes that along to the [d3Scale.ticks](https://github.com/d3/d3-scale) function. If this is an array, hardcodes the ticks to those values. If it's a function, passes along the default tick values and expects an array of tick values in return. */
  export let ticks = 4;

  /** @type {Number} [tickGutter=5] - The amount of whitespace between the start of the tick and the chart drawing area (the xRange min). */
  export let tickGutter = 5;

  /** @type {Number} [dx=0] - Any optional value passed to the `dx` attribute on the text label. */
  export let dx = 0;

  /** @type {Number} [dy=-3] - Any optional value passed to the `dy` attribute on the text label. */
  export let dy = -3;

  /** @type {Number} [charPixelWidth=7.25] - Used to calculate the widest label length to offset labels. Adjust if the automatic tick length doesn't look right because you have a bigger font (or just set `tickMarkLength` to a pixel value). */
  export let charPixelWidth = 7.25;

  $: isBandwidth = typeof $yScale.bandwidth === 'function';

  $: tickVals = Array.isArray(ticks) ? ticks :
    isBandwidth ?
      $yScale.domain() :
      typeof ticks === 'function' ?
        ticks($yScale.ticks()) :
          $yScale.ticks(ticks);

  function calcStringLength(sum, val) {
    if (val === ',' || val === '.') return sum + charPixelWidth * 0.5;
    return sum + charPixelWidth;
  }

  $: tickLen = tickMarks === true
    ? labelPosition === 'above'
      ? tickMarkLength ?? widestTickLen
      : tickMarkLength ?? 6
    : 0;

  $: widestTickLen = Math.max(10, Math.max(...tickVals.map(d => format(d).toString().split('').reduce(calcStringLength, 0))));

  $: halfBand = isBandwidth ? $yScale.bandwidth() / 2 : 0;

  $: maxTickValPerc = Math.max(...tickVals.map($yScale));
</script>

<div class='axis y-axis'>
  {#each tickVals as tick, i (tick)}
    {@const tickValPerc = $yScale(tick)}

    <div class='tick tick-{i}' style='left:{$xRange[0]}%;top:{tickValPerc + halfBand}%;'>
      {#if gridlines === true}
        <div
          class="gridline"
          style='0'
          style:left='0px'
          style:right='{(labelPosition === 'above' ? -widestTickLen : -tickLen) - tickGutter}px'
        ></div>
      {/if}
      {#if tickMarks === true}
        <div
          class="tick-mark"
          style:top='0'
          style:left='{$width + tickGutter}px'
          style:width='{tickLen}px'
        ></div>
      {/if}
      <div
        class="text"
        style:top='0'
        style:left='calc(100% + {tickGutter + (labelPosition === 'even' ? tickLen : 0)}px)'
        style:transform='translate({dx + (labelPosition === 'even' ? 3 : 0)}px, calc(-50% + {dy + (labelPosition === 'above' || (snapBaselineLabel === true && tickValPerc === maxTickValPerc) ? -3 : 4)}px))'
      >{format(tick)}</div>
    </div>
  {/each}
</div>

<style>
  .axis,
  .tick,
  .tick-mark,
  .gridline,
  .baseline,
  .text {
    position: absolute;
  }
  .axis {
    width: 100%;
    height: 100%;
  }
  .tick {
    font-size: 11px;
    width: 100%;
  }

  .gridline {
    border-top: 1px dashed #aaa;
  }
  .tick-mark {
    border-top: 1px solid #aaa;
  }

  .baseline.gridline {
    border-top-style: solid;
  }

  .tick .text {
    color: #666;
  }
</style>