G2

Overview

Uses a set of x values (x1, x2) to position a rectangular area drawn on the x-axis, commonly used for highlighting specific areas.

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

/**
 * A recreation of this demo: https://vega.github.io/vega-lite/examples/layer_falkensee.html
 */

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

chart.options({
  type: 'view',
  width: 600,
  height: 360,
  paddingLeft: 60,
  data: {
    type: 'fetch',
    value: 'https://assets.antv.antgroup.com/g2/year-population.json',
  },
  children: [
    {
      type: 'rangeX',
      data: [
        { year: [new Date('1933'), new Date('1945')], event: 'Nazi Rule' },
        {
          year: [new Date('1948'), new Date('1989')],
          event: 'GDR (East Germany)',
        },
      ],
      encode: { x: 'year', color: 'event' },
      scale: { color: { independent: true, range: ['#FAAD14', '#30BF78'] } },
      style: { fillOpacity: 0.75 },
    },
    {
      type: 'line',
      encode: { x: (d) => new Date(d.year), y: 'population', color: '#333' },
    },
    {
      type: 'point',
      encode: { x: (d) => new Date(d.year), y: 'population', color: '#333' },
      style: { lineWidth: 1.5 },
    },
  ],
});

chart.render();

Additionally, rangeX provides a simplified syntax:

chart
  .rangeX()
  .data([[new Date('2010'), new Date('2011')]])
  .encode('x', (d) => d);

// it can be simplified as follows:
chart.rangeX().data([new Date('2010'), new Date('2011')]);

Configuration

Property	Description	Type	Default	Required
encode	Configure the visual channels of the `rangeX` mark, including `x`, `y`, `color`, `shape`, etc., to specify the relationship between visual element properties and data	encode	-	✓
style	Configure the graphic style of the `rangeX` mark	style	-

encode

Configure the visual channels of the rangeX mark.

Property	Description	Type	Default	Required
x	Bind the `x` property channel of the `rangeX` mark, usually a time or ordinal field from `data`	`string`	-	✓

For more encode configurations, you can check the Encode introduction page.

style

Property	Description	Type	Default
fill	Fill color of the graphic	`string` \| `Function<string>`	-
fillOpacity	Fill opacity of the graphic	`number` \| `Function<number>`	-
stroke	Stroke of the graphic	`string` \| `Function<string>`	-
strokeOpacity	Stroke opacity	`number` \| `Function<number>`	-
lineWidth	Width of the graphic stroke	`number` \| `Function<number>`	-
lineDash	Dashed stroke configuration. The first value is the length of each dash segment, the second value is the distance between segments. Setting lineDash to [0, 0] results in no stroke	`[number,number]` \| `Function<[number, number]>`	-
opacity	Overall opacity of the graphic	`number` \| `Function<number>`	-
shadowColor	Shadow color of the graphic	`string` \| `Function<string>`	-
shadowBlur	Gaussian blur coefficient of the graphic shadow	`number` \| `Function<number>`	-
shadowOffsetX	Horizontal distance of the shadow from the graphic	`number` \| `Function<number>`	-
shadowOffsetY	Vertical distance of the shadow from the graphic	`number` \| `Function<number>`	-
cursor	Mouse cursor style. Same as CSS cursor style, default 'default'	`string` \| `Function<string>`	'default'

For more style configurations, you can check the Style introduction page.

Examples

For more examples, you can visit the Chart Examples - Data Annotation page.