G2

G2 It is a concise progressive syntax mainly used for making web-based visualizations. It provides a set of functional style, declarative API and component programming paradigm, hoping to help users quickly complete dashboard building 、data exploration 、storytelling and other diverse needs.

This article will give you a brief introduction to the core concepts of G2:

Mark: Draw data-driven graphics
Transform: Derived data
Scale: Mapping abstract data into visual data
Coordinate system: applies point transformation to the spatial channel
View composition (Composition): Manage and enhance views
Animation: Data-driven animation and continuous deformation animation
Interaction: Manipulate the view and display detailed information

"Talk is cheap, show me the code", then let's take a look at what visualization effects G2 can make based on the following simple data set.

table({
  url: 'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
});

Tips

In the documentation on the G2 official website, specific code blocks will mount the DOM they return and display them on the web page.

(() => {
  const chart = new G2.Chart();
  // ...
  return chart.getContainer(); // Mount the container for the chart
})();

This is the syntax for a specific operating environment on the G2 official website. Please refer to G2 when using it in actual projects.Get Started。

Mark

Mark It is the smallest visual unit in G2. All charts in G2 are composed of different markers.

(() => {
  const chart = new G2.Chart();

  chart
    .point()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('x', 'weight')
    .encode('y', 'height')
    .encode('color', 'gender');

  chart.render();

  return chart.getContainer();
})();

Transform

Transform will change the display form of data and marks, and is mostly used for data analysis.

(() => {
  const chart = new G2.Chart();

  chart
    .rect()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('x', 'height')
    .encode('color', 'gender')
    .transform({ type: 'binX', y: 'count' })
    .transform({ type: 'stackY' })
    .style('insetLeft', 1);

  chart.render();

  return chart.getContainer();
})();

Scale

Scale is used to control the visual style of markup.

(() => {
  const chart = new G2.Chart();

  chart
    .rect()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('x', 'height')
    .encode('color', 'gender')
    .transform({ type: 'binX', y: 'count' })
    .transform({ type: 'stackY' })
    .scale('color', { range: ['steelblue', 'orange'] })
    .scale('y', { nice: true })
    .style('insetLeft', 1);

  chart.render();

  return chart.getContainer();
})();

Coordinate system

Coordinate System will change the display format of the chart.

(() => {
  const chart = new G2.Chart();

  chart
    .rect()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('x', 'height')
    .encode('color', 'gender')
    .transform({ type: 'binX', y: 'count' })
    .transform({ type: 'stackY' })
    .scale('color', { range: ['steelblue', 'orange'] })
    .scale('y', { type: 'sqrt', nice: true })
    .coordinate({ type: 'polar' })
    .axis('y', { title: false })
    .style('insetLeft', 1);

  chart.render();

  return chart.getContainer();
})();

View composition (Composition)

View composition is used to create multi-view diagrams.

(() => {
  const chart = new G2.Chart({
    paddingLeft: 60,
    
  });

  const facet = chart
    .facetRect()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('y', 'gender');

  facet
    .rect()
    .encode('x', 'height')
    .encode('color', 'gender')
    .transform({ type: 'binX', y: 'count' })
    .transform({ type: 'stackY' })
    .scale('y', { nice: true })
    .attr('frame', false)
    .style('insetLeft', 1);

  chart.render();

  return chart.getContainer();
})();

Animation

Animation supports group animation and keyframe animation. You can click the run button on the left to see the effect.

(() => {
  const chart = new G2.Chart();

  chart
    .rect()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('x', 'height')
    .encode('color', 'gender')
    .encode('enterDuration', 1000)
    .transform({ type: 'stackEnter', groupBy: ['color'] })
    .transform({ type: 'binX', y: 'count' })
    .transform({ type: 'stackY' })
    .style('insetLeft', 1);

  chart.render();

  return chart.getContainer();
})();

(async () => {
  const data = await fetch(
    'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
  ).then((res) => res.json());

  const chart = new G2.Chart();

  const keyframe = chart
    .timingKeyframe()
    .attr('direction', 'alternate')
    .attr('iterationCount', 4);

  keyframe
    .interval()
    .attr('padding', 'auto')
    .data(data)
    .encode('x', 'gender')
    .encode('color', 'gender')
    .encode('key', 'gender')
    .transform({ type: 'groupX', y: 'count' });

  keyframe
    .point()
    .attr('padding', 'auto')
    .data(data)
    .encode('x', 'weight')
    .encode('y', 'height')
    .encode('color', 'gender')
    .encode('groupKey', 'gender')
    .encode('shape', 'point');

  chart.render();

  return chart.getContainer();
})();

Interaction

Interactions can explore data on demand.

(() => {
  const chart = new G2.Chart();

  chart
    .point()
    .data({
      type: 'fetch',
      value:
        'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
    })
    .encode('x', 'weight')
    .encode('y', 'height')
    .encode('color', 'gender')
    .encode('shape', 'point')
    .style({
      fillOpacity: 0.7,
      transform: 'scale(1, 1)',
      transformOrigin: 'center center',
    })
    .state('inactive', {
      fill: 'black',
      fillOpacity: 0.5,
      transform: 'scale(0.5, 0.5)',
    })
    .interaction('brushXHighlight', true);

  chart.render();

  return chart.getContainer();
})();

More capabilities

Because G2's marks are composable and provide a mechanism for creating composite marks to extend G2, you can quickly create virtually any visualization. On the Case page, you can find more inspiration, and the documentation offers a comprehensive understanding of G2's capabilities.

What is G2