Vue+Openlayer批量设置闪烁点的实现代码(基于postrender机制)
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2022-03-25 14:49:06
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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