vue+openlayer实现:拖拽、旋转、缩放、拉伸、移动等功能以及对应的监听事件

前言:

      openlayer 是有他自己的扩展插件 ol-ext,我们这里用他来实现图形的操作:拖拽、旋转、缩放、拉伸、移动等等功能,以及他的监听事件,毕竟我们作图以后是需要保存数据给后端,存到数据库的。

相关资料:

1、ol-ext官方地址:入口

2、ol-ext 对应的资料地址:入口

3、ol-ext 源码gitee地址:入口

4、openlayers 最新官网:入口

5、openlayers 官网api:入口

实现效果:旋转、拖动

图1、实现效果

图2、旋转效果

图3、左右移动效果

 实现步骤:

1、vue中引入openlayers

npm i ol --save

附:npm下载指定版本命令,需要可以拿去

npm install --save-dev [email protected]

2、vue中引入 openlayers的扩展包   ol-ext

npm install ol-ext --save

附:npm下载指定版本命令,需要可以拿去

npm install --save [email protected]

3、创建地图容器


4、js中引入具体配置,根据你的具体改,我这里放的是我自己的

ol有关:

import "ol/ol.css";
import View from "ol/View";
import Map from "ol/Map";
import TileLayer from "ol/layer/Tile";
import Overlay from "ol/Overlay";
import XYZ from "ol/source/XYZ";
import { Vector as SourceVec ,Cluster,Vector as VectorSource } from "ol/source";
import { Feature } from "ol";
import { Vector as LayerVec , Vector as VectorLayer } from "ol/layer";
import { Point, LineString, Polygon } from "ol/geom";

import {
    Style,
    Icon,
    Fill,
    Stroke,
    Text,
    Circle as CircleStyle,
  } from "ol/style";
  import { OSM, TileArcGISRest } from "ol/source";

ol-ext有关:

import ExtTransform from 'ol-ext/interaction/Transform'

5、实现地图方法:

data() {
      return {
        map: null,
        center: [116.39702518856394, 39.918590567855425], //北京故宫的经纬度
        centerSize: 11.5,
        projection: "EPSG:4326",

    }
}
mounted() {
  this.initMap()
}
methods: {
      //初始化地图
      initMap() {
        //渲染地图
        var layers = [
          //深蓝色背景
          // new TileLayer({
          //   source: new XYZ({
          //     url:
          //       "https://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}",
          //   }),
          // }),
          //初始化背景
          // new TileLayer({
          //   source: new OSM(),
          // })
          new TileLayer({
            title: "街道图",
            source: new XYZ({
              url: "http://localhost:8888/haoxing-map/sosomaps/roadmap/{z}/{x}/{y}.jpg",//zwh本地使用
            }),
          }),
        ];

        this.map = new Map({
          layers: layers,
          target: "map",
          view: new View({
            center: this.center,
            projection: this.projection,
            zoom: this.centerSize,
            maxZoom: 17,
            minZoom: 8,
          }),
        });
      },

6、地图上加上多边形数据

mounted() {
 this.initMap()
 this.createPolygon()
},
 methods: {    

    //创建多边形
    createPolygon() {
        //添加图层,并设置点范围
        const polygon = new Feature({
          geometry: new Polygon([
            [
              [116.39314093500519,40.0217660530101],
              [116.47762344990831,39.921746523871924],
              [116.33244947314951,39.89892653421418],
              [116.30623076162784,40.00185925352143],
            ]
          ]),
        })
        //设置样式
        polygon.setStyle(new Style({
          stroke: new Stroke({
            width: 4,
            color: [255, 0, 0, 1],
          }),
        }))
        //将图形加到地图上
        this.map.addLayer(new VectorLayer({
          source: new VectorSource({
            features: [polygon],
          }),
        }))
      },

}

7、地图上添加具体的操作方法和效果

mounted() {
  this.initMap()
  this.createPolygon()
  this.onEdit()
},
//操作事件
onEdit() {
   const transform = new ExtTransform({
       enableRotatedTransform: false,
       hitTolerance: 2,
       translate: true, // 拖拽
       stretch: false, // 拉伸
       scale: true, // 缩放
       rotate: true, // 旋转
       translateFeature: false,
       noFlip: true,
       // layers: [],
    })
   this.map.addInteraction(transform)


  //开始事件
        transform.on(['rotatestart','translatestart'], function(e){
          // Rotation
          let startangle = e.feature.get('angle')||0;
          // Translation
          console.log(1111);
          console.log(startangle);
        });
  //旋转
        transform.on('rotating', function (e){
          console.log(2222);
          console.log("rotate: "+((e.angle*180/Math.PI -180)%360+180).toFixed(2));
          console.log(e);
        });
 //移动
        transform.on('translating', function (e){
          console.log(3333);
          console.log(e.delta);
          console.log(e);

        });
 //拖拽事件
        transform.on('scaling', function (e){
          console.log(4444);
          console.log(e.scale);
          console.log(e);
        });
  //事件结束
        transform.on(['rotateend', 'translateend', 'scaleend'], function (e) {
          console.log(5555);
        });

},

到此就结束了!有问题欢迎评论区一起讨论

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