Vue+Openlayer实现图形的拖动和旋转变形效果

Z时代
2024-01-10
分类：IT

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。

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 ol@6.9.0

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 ol-ext@3.2.16

3、创建地图容器


<template>
  <div id="map" class="map"></div>
</template>

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);
        });
},