---
title: "MapboxDiffusionCircle"
description: "扩散圆效果，多圈同心圆周期性扩张并渐隐。"
seo_title: "MapboxDiffusionCircle Component"
seo_description: "Diffusion effect with multiple concentric circles expanding and fading over point features."
canonical_url: "https://mapbox.mhaibaraai.cn/docs/effects/diffusion"
---
# MapboxDiffusionCircle

> 扩散圆效果，多圈同心圆周期性扩张并渐隐。

## 简介

`MapboxDiffusionCircle` 在点要素上渲染扩散圆：多圈同心圆周期性向外扩张并渐隐；`color` / `maxRadius` / `duration` / `rings` / `opacity` 控制外观与节奏。

## 用法

切换主色查看扩散动画：

```vue [DiffusionExample.vue]
<script setup lang="ts">
import type { FeatureCollection } from 'geojson'

withDefaults(defineProps<{ color?: string }>(), {
  color: '#3b82f6'
})

const data: FeatureCollection = {
  type: 'FeatureCollection',
  features: [
    { type: 'Feature', properties: {}, geometry: { type: 'Point', coordinates: [116.397, 39.908] } },
    { type: 'Feature', properties: {}, geometry: { type: 'Point', coordinates: [116.46, 39.92] } }
  ]
}
</script>

<template>
  <div class="h-115 w-full overflow-hidden rounded-(--ui-radius) border border-default">
    <MapboxMap :options="{ style: 'mapbox://styles/mapbox/dark-v11', center: [116.43, 39.913], zoom: 11 }">
      <MapboxDiffusionCircle :data="data" :color="color" />
    </MapboxMap>
  </div>
</template>
```

## API

### Props

```ts
/**
 * Props for the MapboxDiffusionCircle component
 */
interface MapboxDiffusionCircleProps {
  /**
   * 点要素数据（GeoJSON 或其 URL）
   */
  data: string | GeoJSON.GeoJSON<GeoJSON.Geometry, GeoJSON.GeoJsonProperties> | undefined;
  /**
   * 图层 id 前缀；省略时自动生成
   */
  layerId?: string | undefined;
  /**
   * 主色
   * @default "\"#3b82f6\""
   */
  color?: string | undefined;
  /**
   * 最大扩散半径（像素）
   * @default "40"
   */
  maxRadius?: number | undefined;
  /**
   * 单圈扩散周期（毫秒）
   * @default "2400"
   */
  duration?: number | undefined;
  /**
   * 同时扩散的圈数
   * @default "3"
   */
  rings?: number | undefined;
  /**
   * 峰值不透明度
   * @default "0.6"
   */
  opacity?: number | undefined;
  /**
   * 插入到该图层之前
   */
  beforeId?: string | undefined;
}
```

## Changelog

See commit history for [src/runtime/components/effects/DiffusionCircle.vue](https://github.com/mhaibaraai/movk-mapbox/commits/main/src/runtime/components/effects/DiffusionCircle.vue).


## Sitemap

See the full [sitemap](/sitemap.md) for all pages.