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--- | ||
title: 复合图表地图 | ||
order: 6 | ||
--- | ||
使用二维统计图表代替点状符号的一种特殊复合形式,复合图表地图中常用扩展图形还有柱状图、曲线图、玫瑰图等 |
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--- | ||
title: 聚合图 | ||
order: 5 | ||
--- | ||
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##使用 | ||
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目前只有点图层支持聚类方法 |
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title: 聚合图 | ||
order: 5 | ||
--- | ||
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## 使用 | ||
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目前只有点数据支持聚类方法 | ||
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数据聚合主要从数据层数据,因此需要在Source方法配置 cluster 参数 | ||
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### Source | ||
[source 文档](../../source/source) | ||
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### 配置项 | ||
- cluster **boolean** 是否聚合 | ||
- clusterOption 聚合配置项 | ||
- radius 聚合半径 **number** default 40 | ||
- minZoom: 最小聚合缩放等级 **number** default 0 | ||
- maxZoom: 最大聚合缩放等级 **number** default 16 | ||
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数据聚合之后,数据会增加 point_count属性,在可视化渲染时可以根据 point_count进行数据映射。 | ||
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#### 方法 | ||
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**getClusters(zoom: number)** | ||
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获取指定缩放等级的聚合数据 | ||
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- zoom 缩放等级 | ||
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**getClustersLeaves(id: string)** | ||
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根据id获取聚合节点的数据 | ||
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- id 聚合数据id | ||
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```javascript | ||
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layer.source(pointsData, { | ||
cluster: true, | ||
}); | ||
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// 设置配置项 | ||
layer.source(pointsData, { | ||
cluster: true, | ||
clusterOption:{ | ||
radius:40, | ||
} | ||
}); | ||
``` | ||
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### 完整示例 | ||
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```javascript | ||
const pointLayer = new PointLayer({}) | ||
.source(pointsData, { | ||
cluster: true, | ||
}) | ||
.shape('circle') | ||
.scale('point_count', { | ||
type: 'quantile', | ||
}) | ||
.size('point_count', [5, 10, 15, 20, 25]) | ||
// .size(10) | ||
.color('red') | ||
.style({ | ||
opacity: 0.3, | ||
strokeWidth: 1, | ||
}); | ||
``` | ||
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--- | ||
title: 亮度图 | ||
order: 3 | ||
--- | ||
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 | ||
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## 使用 | ||
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### shape | ||
- dot 如果需要使用亮度图可以将shape设置为dot,或者不设置shape | ||
### color | ||
- 无权重 | ||
如果数据没有权重可以将颜色设置为常量,渲染时会自动进行颜色叠加,点越多颜色约亮 | ||
- 有权重 | ||
为数据有权重可以设置一组同一色相不同亮度的色带。 | ||
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```javascript | ||
const pointLayer = new PointLayer() | ||
.source(data) | ||
.size(2) | ||
.shape('dot') | ||
.color('h8', [ | ||
'#0A3663', | ||
'#1558AC', | ||
'#3771D9', | ||
'#4D89E5', | ||
'#64A5D3', | ||
'#72BED6', | ||
'#83CED6', | ||
'#A6E1E0', | ||
'#B8EFE2', | ||
'#D7F9F0' | ||
]) | ||
.style({ | ||
opacity: 1 | ||
}); | ||
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scene.addLayer(pointLayer); | ||
``` | ||
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## 相关demo | ||
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[城市亮度图](../../../../examples/point/dot) |
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title: 自定义 Marker | ||
order: 7 | ||
--- | ||
可自定义点符号,通过自定义dom实现地图标注,富文本、动态点状符号都可用于地图上信息的标记。 | ||
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## 使用 | ||
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[Marker 文档](../../component) |
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