---
title: "飞线"
language: "en"
canonical: "https://l7.antv.antgroup.com/en/examples/earth/arc3d/flyline/"
---

# 飞线

[Live example](https://l7.antv.antgroup.com/en/examples/earth/arc3d/flyline/)

[Resource index](/llms.txt)

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

## Source

```js
import { EarthLayer, LineLayer, Scene } from '@antv/l7';
import { Earth } from '@antv/l7-maps';
const scene = new Scene({
  id: 'map',
  map: new Earth({}),
});

// 地球模式下背景色默认为 #000 通过 setBgColor 方法我们可以设置可视化层的背景色
scene.setBgColor('#333');

const earthlayer = new EarthLayer()
  .source('https://gw.alipayobjects.com/mdn/rms_23a451/afts/img/A*3-3NSpqRqUoAAAAAAAAAAAAAARQnAQ', {
    parser: {
      type: 'image',
    },
  })
  .color('#2E8AE6')
  .shape('fill')
  .style({
    globalOptions: {
      ambientRatio: 0.6, // 环境光
      diffuseRatio: 0.4, // 漫反射
      specularRatio: 0.1, // 高光反射
    },
  })
  .animate(true);

const atomLayer = new EarthLayer().color('#2E8AE6').shape('atomSphere');

const bloomLayer = new EarthLayer().color('#fff').shape('bloomSphere').style({
  opacity: 0.7,
});

scene.on('loaded', () => {
  scene.addLayer(earthlayer);

  scene.addLayer(atomLayer);
  scene.addLayer(bloomLayer);

  fetch('https://gw.alipayobjects.com/os/bmw-prod/20a69b46-3d6d-4ab5-b8b5-150b6aa52c88.json')
    .then((res) => res.json())
    .then((flydata) => {
      const flyLine = new LineLayer({ blend: 'normal' })
        .source(flydata, {
          parser: {
            type: 'json',
            coordinates: 'coord',
          },
        })
        .color('#b97feb')
        .shape('arc3d')
        .size(0.5)
        .active(true)
        .animate({
          interval: 2,
          trailLength: 2,
          duration: 1,
        })
        .style({
          segmentNumber: 60,
          globalArcHeight: 20,
        });
      scene.addLayer(flyLine);
    });

  earthlayer.setEarthTime(4.0);
});
```

## 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/earth/arc3d/demo/flyline.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'] });
```