---
title: "平面区域标注"
language: "zh"
canonical: "https://l7.antv.antgroup.com/zh/examples/point/text/simplecoordinate/"
---

# 平面区域标注

[运行示例](https://l7.antv.antgroup.com/zh/examples/point/text/simplecoordinate/)

[资料索引](/llms.txt)

页面需要一个 `id="container"` 的 DOM 元素。以下为原始示例源码。

## 源码

```js
import { ImageLayer, PointLayer, Scene } from '@antv/l7';
import { Map } from '@antv/l7-maps';

const scene = new Scene({
  id: 'map',
  map: new Map({
    center: [500, 500],
    zoom: 3,
    version: 'SIMPLE',
    mapSize: 1000,
    maxZoom: 5,
    minZoom: 2,
    pitchEnabled: false,
    rotateEnabled: false,
  }),
});
scene.setBgColor('rgb(94, 182, 140)');

const imagelayer = new ImageLayer({}).source(
  'https://gw.alipayobjects.com/mdn/rms_816329/afts/img/A*I0X5R4jAUQ4AAAAAAAAAAAAAARQnAQ',
  {
    parser: {
      type: 'image',
      extent: [360, 400, 640, 600],
    },
  },
);

scene.on('loaded', () => {
  fetch('https://gw.alipayobjects.com/os/bmw-prod/7dc0d454-fabc-4461-a5d5-d404dadb49a9.json')
    .then((res) => res.json())
    .then((data) => {
      const textlayer = new PointLayer({ zIndex: 2 })
        .source(data, {
          parser: {
            type: 'json',
            x: 'x',
            y: 'y',
          },
        })
        .shape('t', 'text')
        .size(12)
        .active({
          color: '#00f',
          mix: 0.9,
        })
        .color('rgb(86, 156, 214)')
        .style({
          textAnchor: 'center', // 文本相对锚点的位置 center|left|right|top|bottom|top-left
          spacing: 2, // 字符间距
          fontWeight: '800',
          padding: [1, 1], // 文本包围盒 padding [水平，垂直]，影响碰撞检测结果，避免相邻文本靠的太近
          stroke: '#ffffff', // 描边颜色
          strokeWidth: 2, // 描边宽度
          textAllowOverlap: true,
        });
      scene.addLayer(textlayer);
    });

  scene.addLayer(imagelayer);
});
```

## 运行环境

运行示例前，先在含有 #container 的页面中等待以下初始化完成。相关文件附于文末。

```js
await (await import("/src/demo/setup.ts")).default({ container: document.getElementById('container'), path: "/examples/point/text/demo/simplecoordinate.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'] });
```