使用 angular 的 openlayers 范围

Question

我将 angular 6 与 openlayers 5.1.3 一起使用。我尝试合并两个矢量图层的范围，然后适合地图的视图。

我执行以下操作

import Extent from 'ol/interaction/Extent.js';
olextent: Extent;
//then in ngOnInit
ngOnInit() {
  this.olextent = new Extent();
}

//then get the extent of the 2 layers
let relatedext = this.relatedsource.getExtent();
let vectorext = this.vectorsource.getExtent(); 
//then create an empty extent and extent it with the layer extents

ext = this.olextent.createEmpty(); 
ext.extend(this.olextent, relatedext);
ext.extend(this.olextent, vectorext); 

//also create a size and use it with the extent to fit the map view

this.olmap.getView().fit(ext, {size:size, duration: 1500});

这段代码对我来说看起来很正常，但我得到 this.olextent.createEmpty is not a function 并且它不起作用。

我该如何解决这个问题？

Answer 1

我认为这可能是您想要实现的目标（除非您在代码的其他地方进行了一些交互处理）

import {createEmpty, extend} from 'ol/extent.js';

//then in ngOnInit
ngOnInit() {
  this.olextent = createEmpty();
}

//then get the extent of the 2 layers
let relatedext = this.relatedsource.getExtent();
let vectorext = this.vectorsource.getExtent(); 
//then extent empty extent with the layer extents

extend(this.olextent, relatedext);
extend(this.olextent, vectorext); 

//also create a size and use it with the extent to fit the map view

this.olmap.getView().fit(this.olextent, {size:size, duration: 1500});

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