vue+openlayer展示热力图
vue
·
描述:最近在做项目的时候需要用openlayer实现热力图,由于刚开始接触opnelayer,不知道加载的格式是什么,看官网的话也没有给出加载数据的格式。后来经过多次尝试终于显示出来,在此记录一下,不喜可喷!!!话不多说,直接上代码。
效果图:
数据不多,效果不是很明显,有个不足是数据中的count值在鼠标移至热力图点的时候没有显示出来。
vue使用openlayer,可以引入js文件,也可以全局安装,这里使用的是全局安装(npm install ol )。
vue文件:
<template>
<div>
<div id="map"></div>
</div>
</template>
<script>
import Map from 'ol/Map.js'
import View from 'ol/View.js'
import KML from 'ol/format/KML.js'
import { Heatmap as HeatmapLayer } from 'ol/layer.js'
import VectorSource from 'ol/source/Vector.js'
import { transform } from 'ol/proj'
import GeoJSON from 'ol/format/GeoJSON'
export default {
name: 'heatmap',
data () {
return {
map: null,
center: [121.05212688446045, 30.600614547729492],
// 热力图假数据
heatData: {
type: 'FeatureCollection',
features: [
{ type: 'Point', 'coordinates': [ 104.40, 31.19 ], count: 100 },
{ type: 'Point', 'coordinates': [ 113.30, 30.60 ], count: 19 },
{ type: 'Point', 'coordinates': [ 123.30, 30.60 ], count: 419 },
{ type: 'Point', 'coordinates': [ 105.30, 30.60 ], count: 319 },
{ type: 'Point', 'coordinates': [ 106.30, 30.60 ], count: 719 },
{ type: 'Point', 'coordinates': [ 109.30, 31.60 ], count: 519 },
{ type: 'Point', 'coordinates': [ 109.30, 30.60 ], count: 319 },
{ type: 'Point', 'coordinates': [ 108.30, 32.60 ], count: 139 },
{ type: 'Point', 'coordinates': [ 118.30, 31.60 ], count: 129 },
{ type: 'Point', 'coordinates': [ 108.30, 33.60 ], count: 190 },
{ type: 'Point', 'coordinates': [ 108.30, 32.60 ], count: 189 },
{ type: 'Point', 'coordinates': [ 100.30, 30.60 ], count: 1 },
{ type: 'Point', 'coordinates': [ 109.30, 30.60 ], count: 119 },
{ type: 'Point', 'coordinates': [ 108.30, 31.60 ], count: 200 },
{ type: 'Point', 'coordinates': [ 118.30, 30.60 ], count: 300 }
]
}
}
},
methods: {
initMap () {
// 创建一个热力图层
let vector = new HeatmapLayer({
// 矢量数据源
source: new VectorSource({
features: (new GeoJSON()).readFeatures(this.heatData, {
dataProjection: 'EPSG:4326',
featureProjection: 'EPSG:3857'
}),
}),
blur: 20, // 模糊尺寸
radius: 20 // 热点半径
})
this.map = new Map({
target: 'map',
// 在layers中添加自己所需要的图层,这里不做添加,只添加热力图层
layers: [
vector
],
view: new View({
// 地图初始中心位置
center: transform(this.center, 'EPSG:4326', 'EPSG:3857'),
zoom: 5
})
})
}
},
mounted () {
this.initMap()
}
}
</script>
<style scoped>
.label{
font-size: 20px;
}
</style>
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