weather-line-legend-mark.ts

import { G2Spec } from '../../../src';
import { LEGEND_ITEMS_CLASS_NAME } from '../../../src/interaction/legendFilter';
import { weather } from '../../data/weather';
import { step } from './utils';

export function weatherLineLegendMark(): G2Spec {
  const labelByValue = {
    '#EE6666': 'Temperature',
    '#5470C6': 'Evaporation',
    '#91CC75': 'Precipitation',
  };
  const markerByValue = {
    '#EE6666': 'line',
    '#5470C6': 'rect',
    '#91CC75': 'line',
  };
  return {
    type: 'view',
    data: weather,
    children: [
      {
        type: 'line',
        encode: {
          x: 'Month',
          y: 'Temperature',
          color: '#EE6666',
          shape: 'smooth',
        },
        scale: {
          y: { independent: true, domainMax: 30 },
        },
        axis: {
          y: {
            title: 'Temperature (°C)',
            grid: false,
            titleFill: '#EE6666',
          },
        },
      },
      {
        type: 'interval',
        encode: {
          x: 'Month',
          y: 'Evaporation',
          color: '#5470C6',
        },
        scale: {
          y: { independent: true, domainMax: 200 },
        },
        style: {
          fillOpacity: 0.8,
        },
        axis: {
          y: {
            title: 'Evaporation (°C)',
            grid: null,
            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: false,
            titleFill: '#91CC75',
          },
        },
      },
      {
        type: 'legends',
        scale: {
          color: {
            type: 'ordinal',
            independent: true,
            domain: ['#EE6666', '#91CC75', '#5470C6'],
            range: ['#EE6666', '#91CC75', '#5470C6'],
          },
        },
        itemMarker: (d) => markerByValue[d],
        labelFormatter: (d) => labelByValue[d],
      },
    ],
  };
}

weatherLineLegendMark.steps = ({ canvas }) => {
  const { document } = canvas;
  const elements = document.getElementsByClassName(LEGEND_ITEMS_CLASS_NAME);
  const [, , e2] = elements;
  return [step(e2, 'click'), step(e2, 'click')];
};