多轴图同步刻度

import { Chart } from '@antv/g2';

function syncTicksOfDomainsFromZero(scales) {
  scales.forEach((scale) => scale.update({ nice: true }));
  const normalize = (d) => d / Math.pow(10, Math.ceil(Math.log(d) / Math.LN10));
  const maxes = scales.map((scale) => scale.getOptions().domain[1]);
  const normalized = maxes.map(normalize);
  const normalizedMax = Math.max(...normalized);
  for (let i = 0; i < scales.length; i++) {
    const scale = scales[i];
    const domain = scale.getOptions().domain;
    const t = maxes[i] / normalized[i];
    const newDomainMax = normalizedMax * t;
    scale.update({ domain: [domain[0], newDomainMax] });
  }
}

const data = [
  {
    Month: 'Jan',
    Evaporation: 2,
    Precipitation: 2.6,
    Temperature: 2,
  },
  {
    Month: 'Feb',
    Evaporation: 4.9,
    Precipitation: 5.9,
    Temperature: 2.2,
  },
  {
    Month: 'Mar',
    Evaporation: 7,
    Precipitation: 9,
    Temperature: 3.3,
  },
  {
    Month: 'Apr',
    Evaporation: 23.2,
    Precipitation: 26.4,
    Temperature: 4.5,
  },
  {
    Month: 'May',
    Evaporation: 25.6,
    Precipitation: 28.7,
    Temperature: 6.3,
  },
  {
    Month: 'Jun',
    Evaporation: 76.7,
    Precipitation: 70.7,
    Temperature: 10.2,
  },
  {
    Month: 'Jul',
    Evaporation: 135.6,
    Precipitation: 175.6,
    Temperature: 20.3,
  },
  {
    Month: 'Aug',
    Evaporation: 162.2,
    Precipitation: 182.2,
    Temperature: 23.4,
  },
  {
    Month: 'Sep',
    Evaporation: 32.6,
    Precipitation: 48.7,
    Temperature: 23,
  },
  {
    Month: 'Oct',
    Evaporation: 20,
    Precipitation: 18.8,
    Temperature: 16.5,
  },
  {
    Month: 'Nov',
    Evaporation: 6.4,
    Precipitation: 6,
    Temperature: 12,
  },
  {
    Month: 'Dec',
    Evaporation: 3.3,
    Precipitation: 2.3,
    Temperature: 6.2,
  },
];

const chart = new Chart({
  container: 'container',
  autoFit: true,
});

chart.options({
  type: 'view',
  data: data,
  children: [
    {
      type: 'line',
      encode: {
        x: 'Month',
        y: 'Temperature',
        color: '#EE6666',
        shape: 'smooth',
      },
      scale: {
        y: {
          independent: true,
          groupTransform: syncTicksOfDomainsFromZero,
        },
      },
      axis: {
        y: {
          title: 'Temperature (°C)',
          grid: null,
          titleFill: '#EE6666',
        },
      },
    },
    {
      type: 'interval',
      encode: { x: 'Month', y: 'Evaporation', color: '#5470C6' },
      scale: { y: { independent: true } },
      style: { fillOpacity: 0.8 },
      axis: {
        y: {
          position: 'right',
          title: 'Evaporation (ml)',
          titleFill: '#5470C6',
        },
      },
    },
    {
      type: 'line',
      encode: { x: 'Month', y: 'Precipitation', color: '#91CC75' },
      scale: { y: { independent: true } },
      style: { lineWidth: 2, lineDash: [2, 2] },
      axis: {
        y: {
          position: 'right',
          title: 'Precipitation (ml)',
          grid: null,
          titleFill: '#91CC75',
        },
      },
    },
  ],
});

chart.render();