mirror of https://gitee.com/antv-l7/antv-l7
68 lines
1.0 KiB
Markdown
68 lines
1.0 KiB
Markdown
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---
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title: 经典热力图
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order: 1
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---
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## 使用
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```javascript
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import { HeatMapLayer } from '@antv/l7';
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```
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## shape
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常量 heatmap
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```javascript
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layer.shape('heatmap');
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```
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## size
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- field: 热力图权重字段
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- values: 数据映射区间 热力图显示 [0, 1] 效果最佳
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```javascript
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layer.size('weight', [0,1])
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```
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## color
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heatmap 需要设置color 方法，样式通过style 设置
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## style
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- intensity 全局热力权重 推荐权重范围 1-5
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- radius 热力半径，单位像素
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- rampColors 色带参数
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- colors 颜色数组
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- positions 数据区间
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⚠️ color, position 的长度要相同
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## 完整代码
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```javascript
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heatmapLayer()
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.source(data)
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.size('mag', [0, 1]) // weight映射通道
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.style({
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intensity: 3,
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radius: 20,
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rampColors: {
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colors: [
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'rgba(33,102,172,0.0)',
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'rgb(103,169,207)',
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'rgb(209,229,240)',
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'rgb(253,219,199)',
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'rgb(239,138,98)',
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'rgb(178,24,43,1.0)',
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],
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positions: [0, 0.2, 0.4, 0.6, 0.8, 1.0],
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},
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});
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```
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