基于Vue+Openlayer实现动态加载geojson的方法
加载1个或多个要素
<template> <div id="map" style="width: 100vw; height: 100vh"></div> </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, ol } from "ol"; import { Style, Stroke, Fill } from "ol/style"; import { Polygon, MultiPolygon } from "ol/geom"; import areaGeo from "@/assets/chengdu.json"; export default { data() { return { map: {}, areaLayer: {}, }; }, mounted() { this.initMap(); //初始化地图方法 this.addArea(areaGeo); //添加区域图层方法 this.pointMove(); this.getFeatureByClick(); }, methods: { pointMove() { // 设置鼠标划过矢量要素的样式 this.map.on("pointermove", (e) => { const isHover = this.map.hasFeatureAtPixel(e.pixel); this.map.getTargetElement().style.cursor = isHover ? "pointer" : ""; }); }, getFeatureByClick() { this.map.on("click", (e) => { let features = this.map.getFeaturesAtPixel(e.pixel); this.map.getView().fit(features[0].getGeometry(), { duration: 1500, padding: [100, 100, 100, 100], }); }); }, /** * 设置区域 */ addArea(geo = {}) { if (Object.keys(geo).length == 0 && geo.features.length == 0) return; // 设置图层 this.areaLayer = new VectorLayer({ source: new VectorSource({ features: [], }), }); // 添加图层 this.map.addLayer(this.areaLayer); let features = geo.features; for (let i in features) { let areaFeature = {}; if (features[i].geometry.type == "MultiPolygon") { areaFeature = new Feature({ geometry: new MultiPolygon(features[i].geometry.coordinates), }); } else if (features[i].geometry.type == "Polygon") { areaFeature = new Feature({ geometry: new Polygon(features[i].geometry.coordinates), }); } areaFeature.setStyle( new Style({ fill: new Fill({ color: "#4e98f444" }), stroke: new Stroke({ width: 3, color: [71, 137, 227, 1], }), }) ); areaFeature.setProperties(features[i].properties); this.areaLayer.getSource().addFeature(areaFeature); } }, /** * 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: [103, 31], zoom: 7, }), }); }, }, }; </script>
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