G2

Resource index

View Composition in G2 provides the ability to draw multiple charts in a single visualization. G2 defines a View Graph to describe Multi-View Plots.

({
  type: 'spaceLayer',
  children: [{ type: 'view' }, { type: 'view' }],
});

Space

The most basic view composition method is Space Composition, which only divides the space.

A common composition method is composition.spaceLayer: overlaying multiple charts. This is used when the views have different coordinate systems, such as the bar chart and pie chart below.

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

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

const data = [
  { genre: 'Shooter', sold: 350 },
  { genre: 'Sports', sold: 275 },
  { genre: 'Other', sold: 150 },
  { genre: 'Action', sold: 120 },
  { genre: 'Strategy', sold: 115 },
];

chart.options({
  type: 'spaceLayer',
  children: [
    // Bar chart
    {
      type: 'interval',
      data,
      encode: { x: 'genre', y: 'sold' },
    },
    // Pie chart
    {
      type: 'interval', // Create an interval
      paddingLeft: 300, // Set position
      paddingBottom: 250,
      coordinate: { type: 'theta' }, // Specify coordinate system
      transform: [{ type: 'stackY' }],
      data,
      encode: { y: 'sold', color: 'genre' },
      legend: { color: false },
    },
  ],
});

chart.render();

You can also use composition.spaceFlex to arrange views horizontally or vertically.

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

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

const data = [
  { genre: 'Shooter', sold: 350 },
  { genre: 'Sports', sold: 275 },
  { genre: 'Other', sold: 150 },
  { genre: 'Action', sold: 120 },
  { genre: 'Strategy', sold: 115 },
];

chart.options({
  type: 'spaceFlex',
  children: [
    // Bar chart
    {
      type: 'interval',
      data,
      encode: { x: 'genre', y: 'sold' },
    },
    // Pie chart
    {
      type: 'interval', // Create an interval
      coordinate: { type: 'theta' }, // Specify coordinate system
      transform: [{ type: 'stackY' }],
      data,
      encode: { y: 'sold', color: 'genre' },
      legend: { color: false },
    },
  ],
});

chart.render();

These composition methods can be nested, making it easy to implement a dashboard with a single declaration.

Facet

Facet Composition differs from space composition in that it also divides the data, with each view displaying a subset of the original data.

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

const chart = new Chart({
  container: 'container',
  height: 260,
  width: 800,
  paddingLeft: 40,
  paddingBottom: 50,
});

chart.options({
  type: 'facetRect',
  data: {
    type: 'fetch',
    value: 'https://assets.antv.antgroup.com/g2/anscombe.json',
  },
  // Divide the data into subsets by the series field,
  // and arrange them in the x direction
  encode: { x: 'series' },
  children: [
    {
      type: 'point',
      padding: 'auto',
      inset: 10,
      encode: { x: 'x', y: 'y' },
      style: { stroke: '#000' },
    },
  ],
});

chart.render();

Repeat

Repeat Composition differs from facet in that each view displays the full data, but the encoding is repeated to draw multiple views.

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

const chart = new Chart({
  container: 'container',
  width: 900,
  height: 900,
  padding: 'auto',
  paddingLeft: 55,
  paddingBottom: 45,
});

chart.options({
  type: 'repeatMatrix',
  data: {
    type: 'fetch',
    value: 'https://assets.antv.antgroup.com/g2/penguins.json',
    // Data processing
  },
  // Specify the encoding to repeat
  // A total of 4 * 4 = 16 views will be generated
  // The x and y encoding of each view is the cross product of the following fields
  encode: {
    position: [
      'culmen_length_mm',
      'culmen_depth_mm',
      'flipper_length_mm',
      'body_mass_g',
    ],
  },
  children: [
    {
      type: 'point',
      padding: 'auto',
      encode: { color: 'species' },
    },
  ],
});

chart.render();

Timing

Timing Composition manages views in space for animation.

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

fetch(
  'https://gw.alipayobjects.com/os/bmw-prod/fbe4a8c1-ce04-4ba3-912a-0b26d6965333.json',
)
  .then((res) => res.json())
  .then((data) => {
    const chart = new Chart({
      container: 'container',
      paddingTop: 60,
      paddingLeft: 100,
    });

    // Refer to CSS animation description
    chart.options({
      type: 'timingKeyframe', // Create container
      iterationCount: 2, // Number of iterations
      direction: 'alternate', // Direction
      duration: 1000, // Duration
      children: [
        {
          type: 'interval',
          transform: [{ type: 'groupX', y: 'mean' }],
          data,
          encode: { x: 'gender', y: 'weight', color: 'gender', key: 'gender' },
        },
        {
          type: 'point',
          data,
          encode: { x: 'height', y: 'weight', color: 'gender', shape: 'point', groupKey: 'gender' },
        },
      ],
    });

    chart.render();
  });

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