怎么用Vue+Openlayer實(shí)現(xiàn)動(dòng)態(tài)加載geojson

這篇文章主要介紹“怎么用Vue+Openlayer實(shí)現(xiàn)動(dòng)態(tài)加載geojson”，在日常操作中，相信很多人在怎么用Vue+Openlayer實(shí)現(xiàn)動(dòng)態(tài)加載geojson問(wèn)題上存在疑惑，小編查閱了各式資料，整理出簡(jiǎn)單好用的操作方法，希望對(duì)大家解答”怎么用Vue+Openlayer實(shí)現(xiàn)動(dòng)態(tài)加載geojson”的疑惑有所幫助！接下來(lái)，請(qǐng)跟著小編一起來(lái)學(xué)習(xí)吧！

加載1個(gè)或多個(gè)要素

<template>
  <div id="map" ></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(); //初始化地圖方法
    this.addArea(areaGeo); //添加區(qū)域圖層方法
    this.pointMove();
    this.getFeatureByClick();
  },
  methods: {
    pointMove() {
      // 設(shè)置鼠標(biāo)劃過(guò)矢量要素的樣式
      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],
        });
      });
    },
    /**
     * 設(shè)置區(qū)域
     */
    addArea(geo = {}) {
      if (Object.keys(geo).length == 0 && geo.features.length == 0) return;
 
      // 設(shè)置圖層
      this.areaLayer = new VectorLayer({
        source: new VectorSource({
          features: [],
        }),
      });
      // 添加圖層
      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);
      }
    },
    /**
     * 初始化地圖
     */
    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>

到此，關(guān)于“怎么用Vue+Openlayer實(shí)現(xiàn)動(dòng)態(tài)加載geojson”的學(xué)習(xí)就結(jié)束了，希望能夠解決大家的疑惑。理論與實(shí)踐的搭配能更好的幫助大家學(xué)習(xí)，快去試試吧！若想繼續(xù)學(xué)習(xí)更多相關(guān)知識(shí)，請(qǐng)繼續(xù)關(guān)注億速云網(wǎng)站，小編會(huì)繼續(xù)努力為大家?guī)?lái)更多實(shí)用的文章！