我正在使用AGM(Angular Google Maps)和OpenLayers。
我需要以编程方式设置AGM的缩放比例,但无法弄清楚它的工作原理。
HTML地图...
<div id="mapWrap" class="mapWrap" style="padding: 0px; width: 100%; height:
100%; text-align: left">
<agm-map
[latitude]="lat"
[longitude]="lng"
[zoom]="currZoom"
[mapTypeId]="mapType"
[mapTypeControl]="mapControls"
[zoomControl]="mapControls"
[streetViewControl]="mapControls"
></agm-map>
<div id="map" class="map" style="padding: 0px; width: 100%; height: 100%;z-index: 0; position: absolute; opacity: 0.5"></div>
</div>
组件代码
import { Component, OnInit, ViewChild } from '@angular/core';
import { AgmMap } from '@agm/core';
import { GoogleMap } from '@agm/core/services/google-maps-types';
import olMap from 'ol/Map';
import TileLayer from 'ol/layer/Tile';
import View from 'ol/View';
import OSM from 'ol/source/OSM.js';
import XYZ from 'ol/source/XYZ';
import {transform} from 'ol/proj';
import {msFormValues} from './../values/ms-form-values';
@Component({
selector: 'ms-map',
templateUrl: './ms-map.component.html',
styleUrls: ['./ms-map.component.scss']
})
export class MsMapComponent implements OnInit {
// testCoord =
transform([msFormValues.googleLng,msFormValues.googleLat],'EPSG:3857',
'EPSG:4326');
lat: number = msFormValues.googleLat;
lng: number = msFormValues.googleLng;
currZoom: number = msFormValues.googleZoom;
mapType = 'satellite' ;
mapControls = false;
constructor() {}
ngOnInit() {
const osmLayer = new TileLayer({
source: new OSM()
});
const xyzLayer = new TileLayer({
source: new XYZ({
url: 'http://tile.osm.org/{z}/{x}/{y}.png'
})
});
msFormValues.view = new View({
center: [0,0],
zoom: 0,
projection: 'EPSG:3857',
maxZoom: 20,
minZoom: 5
});
msFormValues.googleZoom = msFormValues.view.getZoom();
msFormValues.map = new olMap({
target: 'map',
layers: [
osmLayer,
// xyzLayer
],
view: msFormValues.view
});
msFormValues.view.on('change:center',function() {
var mapCenter = transform(msFormValues.view.getCenter(),'EPSG:3857', 'EPSG:4326');
msFormValues.googleLat = mapCenter[1];
msFormValues.googleLng = mapCenter[0];
});
msFormValues.view.on('change:resolution',function() {
msFormValues.googleZoom = msFormValues.view.getZoom();
});
}
setMapType(mapTypeId: string) {}
}
我实际上是从AngularJS移植过来的,在那里我用 但是,在Angualar 6中,用于google的原始JS似乎只是将google库拉到组件库并不是很简单,并且一旦尝试将组件安装到另一个应用程序中也无法正常工作。
答案 0 :(得分:1)
只需添加到答案中,您还可以使用间隔为缩放动画设置动画
zoomIn(){
const interValZoom = setInterval(() => {
this.zoom = this.zoom + 1 ;
if (this.zoom > 15) {
clearInterval(interValZoom);
// stop the zoom at your desired number
}
}, 100);
}
然后点击按钮
<button (click)="zoomIn()"> Animate Zoom</button>
答案 1 :(得分:0)
因此根据@agm/core
文档,可以进行缩放@input
https://angular-maps.com/api-docs/agm-core/components/agmmap#zoom
更改此输入的值会影响地图的缩放
向您的组件添加这样的功能
public setZoom(): void {
this.zoom = 10;
}
然后将功能绑定到按钮上
<button (click)="setZoom()">Set Zoom</button>
根据您的需求进行调整
答案 2 :(得分:0)
未触发缩放更改检测的原因是,您的currZoom
变量从未更改。我通过使currZoom
变量与地图同步来解决了这个问题。当用户更改缩放比例时,它将更新您的变量。然后,当您要以编程方式更改缩放比例时,就会发现有差异。
<agm-map
[zoom]="currZoom"
(zoomChange)="onZoomChange($event)" <---------- Add this
></agm-map>
currZoom: number = 4 // <---- Example 4 for initial value
onZoomChange(newZoomValue) {
this.currZoom = newZoomValue;
}
现在,您可以更新currZoom
变量,并且agm-map元素将检测到更改。
this.currZoom = 5;