OpenLayers 5获取范围坐标

我试图从OpenLayers 5中的一个区段创建一个多多边形

我通过dragBox的地图交互来获取范围

let extent = selectBox.getGeometry().getExtent();
    myService.select(extent);

select(extent){
let topLeft = extent.getTopLeft();
let topRight = extent.getTopRight();
let bottomLeft = extent.getBottomLeft();
let bottomRight = extent.getBottomRight();
};

getter似乎不起作用，我收到一个错误，例如：“extent.getTopLeft不是一个函数”

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任何帮助都将不胜感激

请使用类似的方法

import * as olExtent from 'ol/extent';

let extent = selectBox.getGeometry().getExtent();
    myService.select(extent);

select(extent){
let topLeft = olExtent.getTopLeft(extent);
let topRight = olExtent.getTopRight(extent);
let bottomLeft = olExtent.getBottomLeft(extent);
let bottomRight = olExtent.getBottomRight(extent);
};

我的解决方案

import { getBottomLeft, getBottomRight, getTopLeft, getTopRight } from 'ol/extent';

然后在具有所选功能的事件/功能中：

const bottomLeft = getBottomLeft(feature.getGeometry().getExtent());
const bottomRight = getBottomRight(feature.getGeometry().getExtent());
const topLeft = getTopLeft(feature.getGeometry().getExtent());
const topRight = getTopRight(feature.getGeometry().getExtent());
console.log(`bottomLeft = ${ bottomLeft }, bottomRight = ${ bottomRight }, topLeft = ${ topLeft }, topRight = ${ topRight }`);

输出：

bottomLeft = 961504.4946941067,5919028.71679848, bottomRight = 961504.4946941067,5919028.71679848, topLeft = 961504.4946941067,5919028.71679848, topRight = 961504.4946941067,5919028.71679848

您可以参考官方文件：