openlayers6实现可拖拽点位，点位可拖拽移动点击移动

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openlayers6实现可拖拽点位

实现功能：需要实现地图上点击出现点位，此点位可拖拽，并且点击移动，从而实现地图选点的功能

使用技术：openlayers6 + react + 高德地图底图

1. 第一步：初始化地图容器

html代码：新增dom节点

<div id="testMap" style={{width: '100vw', height: '100vh'}}></div>

2. 第二步：初始化地图

js代码：初始化时调用方法初始化高德地图

loadMap = () =>{// 添加点位图层var vectorSource = new VectorSource({features: [],});this.vectorLayer = new VectorLayer({source: vectorSource,zIndex: 100});// 需要转换坐标系 - 将4326转化为3857坐标系let m_center = [lngCenter, latCenter];//地图中心点-经纬度坐标m_center = olProj.transform(m_center, 'EPSG:4326', 'EPSG:3857');// 使用高德道路图this.map = new Map({target: 'testMap',layers: [new TileLayer({source: new XYZ({url: mapURL["aMap-vec-d"]})}),this.vectorLayer],view: new View({center: m_center,zoom: 10,minZoom: 5,maxZoom: 18,expandZoomRange: true,projection: 'EPSG:3857'}),});// 调用选点方法this.mapClick();
}

3. 第三步：增加地图选点方法

mapClick = () => {this.map.on('singleclick', (e) => {// 获取当前点位坐标let point = e.coordinate;if(this.iconFeature){// 将地图回中// this.map.getView().setCenter(point);// 将点位清除再绘制// this.vectorLayer.getSource().clear();// 直接修改点位位置this.iconFeature.setGeometry(new Point([point[0], point[1]]));// 将点位转成EPSG:4326坐标系let clickPoint = olProj.transform(point, 'EPSG:3857', 'EPSG:4326');console.log(clickPoint);}else{// 新增点位Featurethis.iconFeature = new Feature({   geometry: new Point([point[0], point[1]]),name: 'Map Point',population: 4000,rainfall: 500,})// 为Feature增加样式let iconStyle = new Style({image: new Icon({anchor: [0.5, 1],// 图片地址src: require('./../../image/map_point.png'),}),});this.iconFeature.setStyle(iconStyle);// 在点位layer中加上Featurethis.vectorLayer.getSource().addFeature(this.iconFeature);// 增加可移动点位元素let iconTranslate = new PointerTranslate({features: new Collection([this.iconFeature])})this.map.addInteraction(iconTranslate);// 为元素增加事件iconTranslate.on("translateend", () => {let clickPoint = this.iconFeature.getGeometry().flatCoordinates;// 将点位转成EPSG:4326坐标系clickPoint = olProj.transform(clickPoint, 'EPSG:3857', 'EPSG:4326');console.log(clickPoint);})}})
}

效果图
点击出现点位
点击打印出点位，拖拽点位也打印出点位
控制台

全部代码

import React from 'react';import TileGrid from "ol/tilegrid/TileGrid";
import TileImage from "ol/source/TileImage";
import Map from 'ol/Map';
import View from 'ol/View';
import XYZ from 'ol/source/XYZ';
import VectorSource from 'ol/source/Vector';
import Feature from 'ol/Feature';
import * as olProj from 'ol/proj';
import Point from 'ol/geom/Point';
import { Style, Icon } from 'ol/style';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
import { Translate as PointerTranslate } from 'ol/interaction';
import Collection from 'ol/Collection';import 'ol/src/ol.css';const lngCenter = "116.397428"
const latCenter = "39.90923"
const mapURL = {/***** 高德地图* lang可以通过zh_cn设置中文，en设置英文，size基本无作用，scl设置标注还是底图，scl=1代表注记，scl=2代表无注记，* style代表底图（矢量或者影像），style设置影像和路网，style=6为影像图，* vec——街道底图* img——影像底图* roadLabel---路网+标注*/"aMap-img-d": "http://webst0{1-4}.is.autonavi.com/appmaptile?style=6&scale=1&x={x}&y={y}&z={z}","aMap-img": "http://webst0{1-4}.is.autonavi.com/appmaptile?style=6&scale=2&x={x}&y={y}&z={z}","aMap-vec-d": "http://webrd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scl=1&style=8&x={x}&y={y}&z={z}","aMap-vec": "http://webrd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scl=2&style=8&x={x}&y={y}&z={z}","aMap-roadLabel": "http://webst0{1-4}.is.autonavi.com/appmaptile?style=8&x={x}&y={y}&z={z}"
}
class TestMap extends React.Component{constructor(props){super(props);}componentDidMount(){this.loadMap();}loadMap = () =>{// 添加点位图层var vectorSource = new VectorSource({features: [],});this.vectorLayer = new VectorLayer({source: vectorSource,zIndex: 100});// 需要转换坐标系 - 将4326转化为3857坐标系let m_center = [lngCenter, latCenter];//地图中心点-经纬度坐标m_center = olProj.transform(m_center, 'EPSG:4326', 'EPSG:3857');this.map = new Map({target: 'testMap',layers: [new TileLayer({source: new XYZ({url: mapURL["aMap-vec-d"]})}),this.vectorLayer],view: new View({center: m_center,zoom: 10,minZoom: 5,maxZoom: 18,expandZoomRange: true,projection: 'EPSG:3857'}),});this.mapClick();}/*** @name: mapClick* @desc: 点击地图出现点位图片 - 点位可移动*/mapClick = () => {this.map.on('singleclick', (e) => {// 获取当前点位坐标let point = e.coordinate;if(this.iconFeature){// 将地图回中// this.map.getView().setCenter(point);// 将点位清除再绘制// this.vectorLayer.getSource().clear();// 直接修改点位位置this.iconFeature.setGeometry(new Point([point[0], point[1]]));// 将点位转成EPSG:4326坐标系let clickPoint = olProj.transform(point, 'EPSG:3857', 'EPSG:4326');console.log(clickPoint);}else{// 新增点位Featurethis.iconFeature = new Feature({   geometry: new Point([point[0], point[1]]),name: 'Map Point',population: 4000,rainfall: 500,})// 为Feature增加样式let iconStyle = new Style({image: new Icon({anchor: [0.5, 1],src: require('./../../image/map_point.png'),}),});this.iconFeature.setStyle(iconStyle);// 在点位layer中加上Featurethis.vectorLayer.getSource().addFeature(this.iconFeature);// 增加可移动点位元素let iconTranslate = new PointerTranslate({features: new Collection([this.iconFeature])})this.map.addInteraction(iconTranslate);// 为元素增加事件iconTranslate.on("translateend", () => {let clickPoint = this.iconFeature.getGeometry().flatCoordinates;// 将点位转成EPSG:4326坐标系clickPoint = olProj.transform(clickPoint, 'EPSG:3857', 'EPSG:4326');console.log(clickPoint);})}})}render(){return(<div id="testMap" style={{width: '100vw', height: '100vh'}}></div>)}
}
export default TestMap