Vue2+OpenLayers实现折线绘制功能（提供Gitee源码）

一、案例截图

二、安装OpenLayers库

三、代码实现

3.1、初始变量

3.2、画一条折线

3.3、完整代码

四、Gitee源码

一、案例截图

二、安装OpenLayers库

npm install ol

三、代码实现

3.1、初始变量

关键代码：

data() {return {map:null,// 定义路径坐标pointList: [[120.430070,31.938140],[120.428570,31.939100],[120.429530,31.941680],[120.431240,31.943580],[120.432410,31.944820],[120.433600,31.943970],],}
},

3.2、画一条折线

思路：

1、使用Feature类，LineString代表线段，传入经纬度集合创建线特征。

2、VectorSource用于存储矢量特征的数据源，这里创建的矢量源存储刚刚创建的lineFeature。

3、VectorLayer创建一个矢量层，在地图的不同z-index（层级）上显示特征。z-index设置为1，确保线条在其他图层之上绘制，将创建的矢量层添加到地图上，使得线条得以在地图上可视化。

关键代码：

drawLine(){// 创建线特征const lineFeature = new Feature({geometry: new LineString(this.pointList),});// 设置线样式const lineStyle = new Style({stroke: new Stroke({color: '#25C2F2',width: 4,lineDash: [10, 8], // 使用点划线 数组的值来控制虚线的长度和间距}),});lineFeature.setStyle(lineStyle);// 创建矢量层并添加特征const vectorSource = new VectorSource({features: [lineFeature],});const vectorLayer = new VectorLayer({source: vectorSource,zIndex: 1});// 将矢量层添加到地图this.map.addLayer(vectorLayer);// 设置地图视图以适应路径this.map.getView().fit(lineFeature.getGeometry().getExtent(), {padding: [20, 20, 20, 20],maxZoom: 18,});
},

3.3、完整代码

<template><div><div id="map-container"></div></div>
</template>
<script>
import {Feature, Map, View} from 'ol'
import { Tile as TileLayer } from 'ol/layer'
import { get } from 'ol/proj';
import { getWidth, getTopLeft } from 'ol/extent'
import { WMTS } from 'ol/source'
import WMTSTileGrid from 'ol/tilegrid/WMTS'
import { defaults as defaultControls} from 'ol/control';
import {LineString, Point} from "ol/geom";
import VectorLayer from "ol/layer/Vector";
import VectorSource from "ol/source/Vector";
import {Icon, Stroke, Style} from "ol/style";export const projection = get("EPSG:4326");
const projectionExtent = projection.getExtent();
const size = getWidth(projectionExtent) / 256;
const resolutions = [];
for (let z = 0; z < 19; ++z) {resolutions[z] = size / Math.pow(2, z);
}export default {data() {return {map:null,// 定义路径坐标pointList: [[120.430070,31.938140],[120.428570,31.939100],[120.429530,31.941680],[120.431240,31.943580],[120.432410,31.944820],[120.433600,31.943970],],}},mounted(){this.initMap() // 加载矢量底图},methods:{initMap() {const KEY = '你申请的KEY'this.map = new Map({target: 'map-container',layers: [// 底图new TileLayer({source: new WMTS({url: `http://t{0-6}.tianditu.com/vec_c/wmts?tk=${KEY}`,layer: 'vec', // 矢量底图matrixSet: 'c', // c: 经纬度投影 w: 球面墨卡托投影style: "default",crossOrigin: 'anonymous', // 解决跨域问题 如无该需求可不添加format: "tiles", //请求的图层格式，这里指定为瓦片格式wrapX: true, // 允许地图在 X 方向重复（环绕）tileGrid: new WMTSTileGrid({origin: getTopLeft(projectionExtent),resolutions: resolutions,matrixIds: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15','16','17','18']})})}),// 标注new TileLayer({source: new WMTS({url: `http://t{0-6}.tianditu.com/cva_c/wmts?tk=${KEY}`,layer: 'cva', //矢量注记matrixSet: 'c',style: "default",crossOrigin: 'anonymous',format: "tiles",wrapX: true,tileGrid: new WMTSTileGrid({origin: getTopLeft(projectionExtent),resolutions: resolutions,matrixIds: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15','16','17','18']})})})],view: new View({center: [118.958366,32.119577],projection: projection,zoom: 12,maxZoom: 17,minZoom: 1}),//加载控件到地图容器中controls: defaultControls({zoom: false,rotate: false,attribution: false})});this.drawLine();},//画线drawLine(){// 创建线特征const lineFeature = new Feature({geometry: new LineString(this.pointList),});// 设置线样式const lineStyle = new Style({stroke: new Stroke({color: '#25C2F2',width: 4,lineDash: [10, 8], // 使用点划线 数组的值来控制虚线的长度和间距}),});lineFeature.setStyle(lineStyle);// 创建矢量层并添加特征const vectorSource = new VectorSource({features: [lineFeature],});const vectorLayer = new VectorLayer({source: vectorSource,zIndex: 1});// 将矢量层添加到地图this.map.addLayer(vectorLayer);// 设置地图视图以适应路径this.map.getView().fit(lineFeature.getGeometry().getExtent(), {padding: [20, 20, 20, 20],maxZoom: 18,});},},}
</script>
<style scoped>#map-container {width: 100%;height: 100vh;
}</style>