---
title: "helix"
description: "helix"
language: "en"
canonical: "https://g2.antv.antgroup.com/en/manual/core/coordinate/helix/"
version: "5.4.8"
---

[Resource index](/llms.txt)

The `helix` coordinate system is a coordinate system that expands two-dimensional data along a spiral line. It is commonly used for visualizing time series data or gene expression data, showing the cyclical nature or trends of data through spiral extension.

## Getting Started



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

const chart = new Chart({
  container: 'container',
  autoFit: true,
  height: 500,
});

// Mock data
const data = [];
for (let i = 0; i < 372; i++) {
  const time = new Date(Date.now() + i * 1000 * 3600 * 24)
    .toISOString()
    .split('T')[0];
  data.push({ time, value: Math.random() * 100 });
}

chart.options({
  type: 'interval',
  data: data,
  coordinate: {
    type: 'helix',
    startAngle: 0.5 * Math.PI, // Starting angle
    endAngle: 12.5 * Math.PI, // Ending angle
  },
  encode: { x: 'time', y: 'value', color: 'value' },
  scale: { color: { range: ['#ffffff', '#1890FF'] } },
});

chart.render();
```



## Configuration

| Parameter   | Description                            | Type     | Default       |
| ----------- | -------------------------------------- | -------- | ------------- |
| startAngle  | Starting angle of the spiral (radians) | `number` | `0`           |
| endAngle    | Ending angle of the spiral (radians)   | `number` | `Math.PI * 6` |
| innerRadius | Inner radius of the spiral (0 to 1)    | `number` | `0`           |
| outerRadius | Outer radius of the spiral (0 to 1)    | `number` | `1`           |