Zooming and Centering
Documentation
This demo shows the VectorMap zooming and centering capabilities. The map contains several cities represented by dot markers. To identify a city, pause on its marker, and the name of the city will appear in a tooltip. Moreover, if you click the marker, the map will be zoomed and centered on it. In code it is performed by calling the center(centerCoordinates) and zoomFactor(zoomFactor) methods. A click on the «Reset» button restores default center coordinates and zoom factor.
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<dx-vector-map
id="vector-map"
[bounds]="[-180, 85, 180, -60]"
(onClick)="markerClick($event)">
<dxo-tooltip
[enabled]="true"
[customizeTooltip]="customizeTooltip"></dxo-tooltip>
<dxi-layer
[dataSource]="worldMap"
[hoverEnabled]="false"></dxi-layer>
<dxi-layer [dataSource]="markers"></dxi-layer>
</dx-vector-map>
<dx-button
id="reset"
text="Reset"
(onClick)="resetClick()"></dx-button>
import { NgModule, Component, ViewChild, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxVectorMapComponent, DxVectorMapModule, DxButtonModule } from 'devextreme-angular';
import * as mapsData from 'devextreme/dist/js/vectormap-data/world.js';
import { Marker, Service } from './app.service';
if(!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
providers: [ Service ],
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css']
})
export class AppComponent {
@ViewChild(DxVectorMapComponent, { static: false }) vectorMap: DxVectorMapComponent
worldMap: any = mapsData.world;
markers: Marker[];
constructor(service: Service) {
this.markers = service.getMarkers();
}
customizeTooltip(arg) {
if(arg.layer.type === "marker") {
return {
text: arg.attribute("name")
};
}
}
markerClick(e) {
if(e.target && e.target.layer.type === "marker") {
e.component.center(e.target.coordinates()).zoomFactor(10);
}
}
resetClick() {
this.vectorMap.instance.center(null);
this.vectorMap.instance.zoomFactor(null);
}
}
@NgModule({
imports: [
BrowserModule,
DxVectorMapModule,
DxButtonModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #vector-map {
height: 420px;
display: block;
}
::ng-deep #reset {
margin: 10px 2px;
}
import { Injectable } from '@angular/core';
export class Attributes {
name: string;
}
export class Marker {
coordinates: number[];
attributes: Attributes;
}
let markers: Marker[] = [
{
coordinates: [-0.1262, 51.5002],
attributes: {
name: 'London'
}
},
{
coordinates: [149.1286, -35.2820],
attributes: {
name: 'Canberra'
}
},
{
coordinates: [139.6823, 35.6785],
attributes: {
name: 'Tokyo'
}
},
{
coordinates: [-77.0241, 38.8921],
attributes: {
name: 'Washington'
}
},
{
coordinates: [-75.6794, 45.4214],
attributes: {
name: 'Ottawa'
}
},
{
coordinates: [37.617778, 55.751667],
attributes: {
name: 'Moscow'
}
},
{
coordinates: [116.4, 39.933333],
attributes: {
name: 'Beijing'
}
},
{
coordinates: [12.5, 41.9],
attributes: {
name: 'Rome'
}
},
{
coordinates: [23.716667, 38],
attributes: {
name: 'Athens'
}
},
{
coordinates: [2.333333, 48.833333],
attributes: {
name: 'Paris'
}
},
{
coordinates: [-3.683333, 40.4],
attributes: {
name: 'Madrid'
}
},
{
coordinates: [-47.866667, -15.798889],
attributes: {
name: 'Brasilia'
}
}
];
@Injectable()
export class Service {
getMarkers(): Marker[] {
return markers;
}
}
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.config = {
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};
System.config(window.config);
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