mirror of https://gitee.com/antv-l7/antv-l7
55 lines
1.3 KiB
Markdown
55 lines
1.3 KiB
Markdown
---
|
|
title: 亮度图
|
|
order: 4
|
|
---
|
|
<embed src="@/docs/common/style.md"></embed>
|
|
|
|
亮度图又称点密度图，单位面积的内点的个数越多，亮度会越亮，亮度图一般用来表达海量点数据分布情况
|
|
|
|
<div>
|
|
<div style="width:60%;float:left; margin: 10px;">
|
|
<img width="80%" alt="案例" src='https://gw.alipayobjects.com/mdn/antv_site/afts/img/A*xr8BQouXGvoAAAAAAAAAAABkARQnAQ'>
|
|
</div>
|
|
</div>
|
|
|
|
### 实现
|
|
|
|
下面我们来介绍如何绘制一个简单的亮度图。
|
|
|
|
- 你可以在 `L7` 官网上找到[在线案例](/examples/gallery/basic#normal)
|
|
|
|
```javascript
|
|
import { Scene, PointLayer } from '@antv/l7';
|
|
import { GaodeMap } from '@antv/l7-maps';
|
|
|
|
const scene = new Scene({
|
|
id: 'map',
|
|
map: new GaodeMap({
|
|
center: [ 121.417463, 31.215175 ],
|
|
style: 'dark',
|
|
zoom: 11
|
|
})
|
|
});
|
|
scene.on('loaded', () => {
|
|
fetch('https://gw.alipayobjects.com/os/rmsportal/BElVQFEFvpAKzddxFZxJ.txt')
|
|
.then(res => res.text())
|
|
.then(data => {
|
|
const pointLayer = new PointLayer({})
|
|
.source(data, {
|
|
parser: {
|
|
type: 'csv',
|
|
y: 'lat',
|
|
x: 'lng'
|
|
}
|
|
})
|
|
.size(0.5)
|
|
.color('#080298');
|
|
scene.addLayer(pointLayer);
|
|
});
|
|
});
|
|
```
|
|
|
|
### shape
|
|
|
|
使用亮度图需要将 `shape` 的参数设置为 `dot`，或者不设置 `shape` 函数。
|