react 之 openlayer地图标注

一、引入依赖的库文件

import React, { Component } from 'react';
import Map from '../../component/map/map';
// 数据源
import { Vector as VectorSource } from 'ol/source';
// 图层
import { Vector} from 'ol/layer';
// 要素
import Feature from 'ol/Feature';
// 
import {Point} from 'ol/geom';
// 坐标系转化
import {fromLonLat} from 'ol/proj';
// 样式
import {Icon,Style} from 'ol/style';
// mark标注图片
import markImage from '../../assets/Marker.png'

二、加载地图组件

  
  render() {
    return (
      

        {/*  */}
        点击开始添加标注
        
    );
  }

三、添加标注

 let {map} = this.refs.map
    //创建标注要素
    let markFeature = new Feature({
        geometry: new Point(fromLonLat([116.28, 39.54])),

    })
    //设置图标的样式
    markFeature.setStyle(this.setMakerStyle)
    // 创建标注的数据源
    var vectorSource = new VectorSource({
        features: [markFeature]
    });
    // 创建标注图层
    var vectorLayer = new Vector({
        source: vectorSource
    });
    // 将标注图层添加到地图上
    map.addLayer(vectorLayer);

    this.setState({
        vectorSource
    })

四、全部代码

// 设置地图背景色
import React, { Component } from 'react';
import Map from '../../component/map/map';
// 数据源
import { Vector as VectorSource } from 'ol/source';
// 图层
import { Vector} from 'ol/layer';
// 要素
import Feature from 'ol/Feature';
// 
import {Point} from 'ol/geom';
// 坐标系转化
import {fromLonLat} from 'ol/proj';
// 样式
import {Icon,Style} from 'ol/style';
// mark标注图片
import markImage from '../../assets/Marker.png'
class MapOverviewMap extends Component {
    constructor(props){
        super(props)
        this.state={
            
        }
    }
  componentDidMount() {
    let {map} = this.refs.map
    //创建标注要素
    let markFeature = new Feature({
        geometry: new Point(fromLonLat([116.28, 39.54])),

    })
    //设置图标的样式
    markFeature.setStyle(this.setMakerStyle)
    // 创建标注的数据源
    var vectorSource = new VectorSource({
        features: [markFeature]
    });
    // 创建标注图层
    var vectorLayer = new Vector({
        source: vectorSource
    });
    // 将标注图层添加到地图上
    map.addLayer(vectorLayer);

    this.setState({
        vectorSource
    })

  }

  addMarker = ()=>{
    let {map} = this.refs.map
    let that = this
   //鼠标单击事件
   map.on('singleclick', function (e) {
        console.log(e)
        // alert("鼠标被单击了"+e.coordinate);
        that.addMakerOn(e.coordinate)
    });
  }

  addMakerOn = (coordinate)=>{
    //创建标注要素
    let markFeature = new Feature({
        geometry: new Point(coordinate),

    })
    //设置图标的样式
    markFeature.setStyle(this.setMakerStyle)
    // 图标要素添加到数据源上
    this.state.vectorSource.addFeature(markFeature)
  }

  setMakerStyle=()=>{
   return new Style({
        /**{olx.style.IconOptions}类型*/
        image: new Icon(
            ({
                anchor: [0.5, 40],
                anchorOrigin: 'top-right',
                anchorXUnits: 'fraction',
                anchorYUnits: 'pixels',
                offsetOrigin: 'top-right',
                // offset:[0,10],
                //图标缩放比例
                scale:0.6,
                //透明度
                opacity: 0.75,
                //图标的url
                src: markImage
            })
            )
    })
  }
  
  render() {
    return (
      

        {/*  */}
        点击开始添加标注
        
    );
  }
}

export default MapOverviewMap;

五、效果图