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
