G2

Overview

brushYFilter interaction is a vertical-constrained version of brushFilter, specifically designed for data filtering based on Y-axis dimensions. This interaction restricts users to vertical brush selection operations (along the Y-axis direction only) to filter chart elements by range, particularly suitable for numerical interval analysis, vertical comparison, and other scenarios.

Key characteristics:

Vertical operation: Only allows vertical direction brush selection, X-axis range is automatically fully selected

Numerical focus: Precise control of Y-axis numerical range (such as price intervals, temperature ranges)

Dynamic response: Filter results are mapped to associated views in real-time

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

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

chart.options({
  type: 'point',
  autoFit: true,
  data: {
    type: 'fetch',
    value: 'https://gw.alipayobjects.com/os/antvdemo/assets/data/scatter.json',
  },
  encode: {
    x: 'height',
    y: 'weight', // Y-axis bound to numerical data
  },
  interaction: {
    brushYFilter: { maskStroke: '#52c41a' }, // Enable vertical filtering with green border
  },
});

chart.render();

Usage

There are two ways to configure brushYFilter interaction:

Quick Enable Mode

Enable interaction with a boolean value using default configuration:

({
  type: 'interval',
  interaction: { brushYFilter: true }, // Enable Y-axis brush filter with default configuration
});

Custom Configuration Mode

Fine-tune interaction behavior through configuration options:

({
  type: 'interval',
  interaction: {
    brushYFilter: {
      reverse: false, // Disable reverse selection
      maskFill: '#rgba(0,0,0,0.3)', // Custom mask color
    },
  },
});

Configuration Level

Interaction can be configured at the Mark level:

({
  type: 'interval',
  interaction: { brushYFilter: true },
});

It can also be configured at the View level. Interactions declared on the view will be passed to marks declared in children. If the mark has declared the corresponding interaction, they will be merged; otherwise, it won't be affected.

({
  type: 'view',
  interaction: { brushYFilter: true },
});

Configuration Options

Property	Description	Type	Default	Required
reverse	Whether to reverse brush	boolean	false
mask	Style of brush area mask	mask	See mask

mask

Configure the style of the brush area mask.

Property	Description	Type	Default
maskFill	Mask fill color	string	`#777`
maskFillOpacity	Mask fill opacity	number	0.3
maskStroke	Mask stroke	string	`#fff`
maskStrokeOpacity	Stroke opacity	number
maskLineWidth	Mask stroke width	number
maskLineDash	Stroke dash configuration. First value is dash length, second is gap length. Setting lineDash to [0,0] means no stroke.	[number,number]
maskOpacity	Mask overall opacity	number
maskShadowColor	Mask shadow color	string
maskShadowBlur	Mask shadow Gaussian blur coefficient	number
maskShadowOffsetX	Set horizontal distance of shadow from mask	number
maskShadowOffsetY	Set vertical distance of shadow from mask	number
maskCursor	Mouse cursor style. Same as CSS cursor style	string	`default`

When configuring the mask style of the brush area, it's not configured as an object, but using the mask prefix with property names.

Style configuration example:

({
  interaction: {
    brushYFilter: {
      maskFill: '#000',
      maskFillOpacity: 0.2,
      maskStroke: 'red',
      maskStrokeOpacity: 0.9,
      maskLineWidth: 2,
      maskLineDash: [4, 8],
      maskOpacity: 0.2,
      maskShadowColor: '#d3d3d3',
      maskShadowBlur: 10,
      maskShadowOffsetX: 10,
      maskShadowOffsetY: 10,
      maskCursor: 'pointer',
    },
  },
});

Events

Listening to Events

Listen to brush filter actions:

chart.on('brush:filter', (event) => {
  const {
    data, // Filtered data collection
    nativeEvent, // Original DOM event
  } = event;
  const [yMin, yMax] = data.selection[1]; // Note the data structure difference
  console.log(`Value range: ${yMin.toFixed(2)} - ${yMax.toFixed(2)}`);
});

Triggering Interaction

Trigger filtering programmatically:

// Set Y-axis filter range (numerical example)
chart.emit('brush:filter', {
  data: {
    selection: [
      null, // X-axis remains fully selected
      [20, 60], // Y-axis range 20-60
    ],
  },
});

Examples

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

const data = [
  { letter: 'A', frequency: 0.08167 },
  { letter: 'B', frequency: 0.01492 },
  { letter: 'C', frequency: 0.02782 },
  { letter: 'D', frequency: 0.04253 },
  { letter: 'E', frequency: 0.12702 },
  { letter: 'F', frequency: 0.02288 },
  { letter: 'G', frequency: 0.02015 },
  { letter: 'H', frequency: 0.06094 },
  { letter: 'I', frequency: 0.06966 },
  { letter: 'J', frequency: 0.00153 },
  { letter: 'K', frequency: 0.00772 },
  { letter: 'L', frequency: 0.04025 },
  { letter: 'M', frequency: 0.02406 },
  { letter: 'N', frequency: 0.06749 },
  { letter: 'O', frequency: 0.07507 },
  { letter: 'P', frequency: 0.01929 },
  { letter: 'Q', frequency: 0.00095 },
  { letter: 'R', frequency: 0.05987 },
  { letter: 'S', frequency: 0.06327 },
  { letter: 'T', frequency: 0.09056 },
  { letter: 'U', frequency: 0.02758 },
  { letter: 'V', frequency: 0.00978 },
  { letter: 'W', frequency: 0.0236 },
  { letter: 'X', frequency: 0.0015 },
  { letter: 'Y', frequency: 0.01974 },
  { letter: 'Z', frequency: 0.00074 },
];

const chart = new Chart({
  container: 'container',
});
chart.options({
  autoFit: true,
  interaction: {
    brushYFilter: {
      maskFill: '#000',
      maskFillOpacity: 0.2,
      maskStroke: 'red',
      maskStrokeOpacity: 0.9,
      maskLineWidth: 2,
      maskLineDash: [4, 8],
      maskOpacity: 0.2,
      maskShadowColor: '#d3d3d3',
      maskShadowBlur: 10,
      maskShadowOffsetX: 10,
      maskShadowOffsetY: 10,
      maskCursor: 'pointer',
    },
  },
});

chart.interval().data(data).encode('x', 'letter').encode('y', 'frequency');

chart.render();