Vue+Openlayer批量设置闪烁点的实现代码(基于postrender机制)
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2022-07-03 21:37:36
效果图：实现代码：
效果图：
实现代码：
<template>
<div id="map" style="width: 100vw; height: 100vh" />
</template>
<script>
import "ol/ol.css";
import tilelayer from "ol/layer/tile";
import vectorlayer from "ol/layer/vector";
import vectorsource from "ol/source/vector";
import xyz from "ol/source/xyz";
import { map, view, feature } from "ol";
import { style, circle, stroke } from "ol/style";
import { point } from "ol/geom";
import { getvectorcontext } from "ol/render";
// 边界json数据
export default {
data() {
return {
map: {},
coordinates: [
{ x: "106.918082", y: "31.441314" }, //重庆
{ x: "86.36158200334317", y: "41.42448570787448" }, //*
{ x: "89.71757707811526", y: "31.02619817424643" }, //*
{ x: "116.31694544853109", y: "39.868508850821115" }, //北京
{ x: "103.07940932026341", y: "30.438580338450862" }, //成都
],
speed: 0.3,
};
},
mounted() {
this.initmap();
this.adddynamicpoints(this.coordinates);
},
methods: {
/**
* 初始化地图
*/
initmap() {
this.map = new map({
target: "map",
layers: [
new tilelayer({
source: new xyz({
url: "http://map.geoq.cn/arcgis/rest/services/chinaonlinestreetpurplishblue/mapserver/tile/{z}/{y}/{x}",
}),
}),
],
view: new view({
projection: "epsg:4326",
center: [108.522097, 37.272848],
zoom: 4.7,
}),
});
},
/**
* 批量添加闪烁点
*/
adddynamicpoints(coordinates) {
// 设置图层
let pointlayer = new vectorlayer({ source: new vectorsource() });
// 添加图层
this.map.addlayer(pointlayer);
// 循环添加feature
let pointfeature = [];
for (let i = 0; i < coordinates.length; i++) {
// 创建feature，一个feature就是一个点坐标信息
const feature = new feature({
geometry: new point([coordinates[i].x, coordinates[i].y]),
});
pointfeature.push(feature);
}
//把要素集合添加到图层
pointlayer.getsource().addfeatures(pointfeature);
// 关键的地方在此：监听postrender事件，在里面重新设置circle的样式
let radius = 0;
pointlayer.on("postrender", (e) => {
if (radius >= 20) radius = 0;
let opacity = (20 - radius) * (1 / 20); //不透明度
let pointstyle = new style({
image: new circle({
radius: radius,
stroke: new stroke({
color: "rgba(255,0,0" + opacity + ")",
width: 3 - radius / 10, //设置宽度
}),
}),
});
// 获取矢量要素上下文
let vectorcontext = getvectorcontext(e);
vectorcontext.setstyle(pointstyle);
pointfeature.foreach((feature) => {
vectorcontext.drawgeometry(feature.getgeometry());
});
radius = radius + this.speed; //调整闪烁速度
//请求地图渲染（在下一个动画帧处）
this.map.render();
});
},
},
};
</script>
参考：https://xiehao.blog.csdn.net/article/details/119955823
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