将接口返回的经纬集合点在高德地图上标记展示, 如果实时刷新地图标记点,不加优化,则会造成过多的带宽消耗 所以,地图只需加载一次,局部更新标记点就好了。
<template>
<section class="map_warpper">
<div id="container" class="map"></div>
</section>
</template>
<script>
import redMarker from '@/assets/img/marker-red.png'
import locationMarker from '@/assets/img/marker-location.png'
export default {
name: 'mapContainer',
data () {
return {
// 动态的经纬度点集合
locationArray: [],
markers: [],
cluster: [],
map: null,
// 地图中心点
regionLocation: [],
zoom: 0
}
},
mounted () {
this.initMap()
},
methods: {// 实例化地图
initMap () {
this.regionLocation = util.cookies.get('regionLocation').split(',')
const AMap = window.AMap
this.map = new AMap.Map('container', {
resizeEnable: true,
center: this.regionLocation,
zoom: 12
})
this.setMarker()
},
// 设置点标记
setMarker () {
this.markers = []
const AMap = window.AMap
// 标记样式
for (const i in this.locationArray) {
const position = this.locationArray[i].split(',')
this.markers.push(new AMap.Marker({
position: position,
content: '<img src=' + locationMarker + '>',
offset: new AMap.Pixel(-15, -15)
}))
}
// 聚合点样式
let sts = [{
url: redMarker,
size: new AMap.Size(64, 64),
offset: new AMap.Pixel(-32, -32)
}]
// 点聚合
this.cluster = new AMap.MarkerClusterer(this.map, this.markers, { styles: sts, gridSize: 80 })
// 自适应展示所有标记点
this.map.setFitView(this.markers)
this.zoom = this.map.getZoom()
}
}
}
</script>
<style>
.map {
width: 100%;
height: 100%;
}
.map_warpper {
width: 100%;
height: 800px;
}
</style>
上面代码解决了两个bug:
1.每次执行setMarker()时,都会this.markers = [], 这一步清除标记点,驱动地图标记刷新,然而并未刷新,新旧点并存,随着叠加,点会越来越多, 这时记得queryLocation()调用前强行删除点 this.cluster.Ra = []
2.然而集合点更新了,但视图依旧未触发更新,这时就需要缩放地图来触发更新, this.map.getZoom()获取当前缩放级别,然后通过 this.map.setZoom()设置缩放,视图达到刷新,问题解决。