Overview

In G6, the theme is a subset of Graph Options and includes configurations related to the canvas and element styles. A theme can help you quickly switch between different graph styles.

Custom Theme

For element styles, the configurations within a theme are static and do not support the use of callback functions to dynamically calculate styles. Additionally, type is also not supported for configuration within a theme. A theme includes the following configurations:

• background: Canvas background color
• node: Node style
• edge: Edge style
• combo: Combo style

Below is a simple example of a theme configuration:

const theme = {
  background: '#fff',
  node: {
    style: {
      fill: '#e1f3fe',
      lineWidth: 0,
    },
    selected: {
      style: {
        fill: '#3b71d6',
        lineWidth: 1,
      },
    },
  },
  edge: {
    // ...
  },
  combo: {
    // ...
  },
};

❌ Incorrect Example

const theme = {
  node: {
    // ❌ The theme does not support configuring element types
    type: 'rect',
    style: {
      // ❌ The theme does not support callback functions
      fill: (d) => d.style.color,
    },
  },
};

Register Theme

You can register a theme using the register method provided by G6. Here is an example:

import { register, ExtensionCategory } from '@antv/g6';

register(ExtensionCategory.THEME, 'custom-theme', theme);

Configure Theme

To enable and configure a theme, you need to pass the theme option when instantiating the Graph:

{
  theme: 'custom-theme',
}

Switch Theme

After the Graph instance is created, you can switch themes by using the setTheme method:

graph.setTheme('dark');

Additionally, you can also obtain the current theme by using the getTheme method:

graph.getTheme();
// => 'dark'