---
title: "客流图层"
language: "en"
canonical: "https://l7.antv.antgroup.com/en/examples/composite-layers/l7plot/flow-layer/"
---

# 客流图层

[Live example](https://l7.antv.antgroup.com/en/examples/composite-layers/l7plot/flow-layer/)

[Resource index](/llms.txt)

Provide a DOM element with `id="container"`. The original example source follows.

## Source

```js
import { GaodeMapV2, LayerPopup, Scene } from '@antv/l7';
import { FlowLayer } from '@antv/l7-composite-layers';

// 详情可见：https://l7plot.antv.antgroup.com/api/composite-layers/flow-layer

const scene = new Scene({
  id: 'map',
  map: new GaodeMapV2({
    pitch: 0,
    style: 'dark',
    center: [121.458794, 31.205302],
    zoom: 10.95,
  }),
});

scene.on('loaded', async () => {
  const response = await fetch(
    'https://gw.alipayobjects.com/os/bmw-prod/f4f3e99a-1d6c-4ab0-b08f-ec730c576b62.json',
  );
  const data = await response.json();

  const flowLayer = new FlowLayer({
    source: {
      data,
      parser: {
        type: 'json',
        x: 'f_lon',
        y: 'f_lat',
        x1: 't_lon',
        y1: 't_lat',
        weight: 'weight',
      },
    },
  });

  flowLayer.on('circleLayer:click', (e) => console.log('circle layer click', e));
  flowLayer.on('lineLayer:click', (e) => console.log('line layer click', e));
  scene && flowLayer.addTo(scene);

  const layerPopup = new LayerPopup({
    items: [
      {
        layer: 'circleLayer',
        fields: ['id', 'weight'],
      },
      {
        layer: 'lineLayer',
        fields: ['id', 'weight'],
      },
    ],
  });
  scene.addPopup(layerPopup);
});
```

## Runtime environment

Before evaluating the example, await this setup in a page containing #container. Supporting files follow below.

```js
await (await import("/src/demo/setup.ts")).default({ container: document.getElementById('container'), path: "/examples/composite-layers/l7plot/demo/flow-layer.js" });
```


## src/demo/setup.ts

```ts
import type { DemoSetupContext } from '@antv/astro-theme-antv';
import * as District from 'district-data';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';

export default async function setup({ container, path }: DemoSetupContext) {
  // Tool pages provide their own React layout and SDK imports.
  if (!path.startsWith('/examples/')) return;
  // Retain only the original globals still used by gallery examples.
  Object.assign(window, { District, GLTFLoader });
  const map = document.createElement('div');
  map.id = 'map';
  container.append(map);
  await import('./map.css');
  // Match the original gallery's shared AMap environment, including raw AMap demos.
  await import('./amap');
}
```

## src/demo/map.css

```css
#map {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 320px;
}

.labelclass {
  position: absolute;
  display: inline;
  cursor: pointer;
  background: rgb(255, 228, 120);
  border: solid 2px #fff;
  padding: 4px;
  white-space: nowrap;
  font:
    bold 12px/18px arial,
    sans-serif;
  color: #fff;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  line-height: 30px;
  /* opacity: 0.7; */
  text-align: center;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
```

## src/demo/amap.ts

```ts
import AMapLoader from '@amap/amap-jsapi-loader';

// Preserve the site's development and production SDK registrations.
const credentials = import.meta.env.DEV
  ? { key: '6f025e700cbacbb0bb866712d20bb35c', securityJsCode: '290ddc4b0d33be7bc9b354bc6a4ca614' }
  : { key: 'f59bcf249433f8b05caaee19f349b3d7', securityJsCode: '2653011adeb04230b3a26cc9a780a800' };
window._AMapSecurityConfig = { securityJsCode: credentials.securityJsCode };
await AMapLoader.load({ key: credentials.key, version: '2.0', plugins: ['Map3D'] });
```