Angular Vector Map - Palette

This demo shows how to color specific map areas using a palette. In the VectorMap component, a palette defines a range of colors that are used to paint areas. This range is divided into segments using the value assigned to the colorGroups property. Each segment contributes a color into an array of colors.

The map in this demo represents the top 40 countries by population. Map areas are colored according to the percentage of population.

Backend API

<dx-vector-map id="vector-map" [bounds]="[-180, 85, 180, -60]"> <dxo-vector-map-tooltip [enabled]="true" [customizeTooltip]="customizeTooltip" ></dxo-vector-map-tooltip> <dxi-vector-map-layer name="areas" palette="Violet" colorGroupingField="population" [colorGroups]="[0, 0.5, 0.8, 1, 2, 3, 100]" [dataSource]="worldMap" [customize]="customizeLayers" ></dxi-vector-map-layer> <dxi-vector-map-legend [customizeText]="customizeText"> <dxo-vector-map-source layer="areas" grouping="color" ></dxo-vector-map-source> </dxi-vector-map-legend> </dx-vector-map>

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DxVectorMapModule } from 'devextreme-angular'; import * as mapsData from 'devextreme-dist/js/vectormap-data/world.js'; import { Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', providers: [Service], templateUrl: './app.component.html', styleUrls: ['./app.component.css'], imports: [ DxVectorMapModule, ], }) export class AppComponent { worldMap = mapsData.world; populations: Object; constructor(service: Service) { this.populations = service.getPopulations(); this.customizeLayers = this.customizeLayers.bind(this); } customizeTooltip({ attribute }: { attribute: Function }) { if (attribute('population')) { return { text: `${attribute('name')}: ${attribute('population')}% of world population`, }; } return null; } customizeLayers(elements: { attribute: Function }[]) { elements.forEach((element) => { element.attribute('population', this.populations[element.attribute('name')]); }); } customizeText({ index, start, end }: Record<string, number>) { const text = (index === 0) ? '< 0.5%' : `${start}% to ${end}%`; return (index === 5) ? '> 3%' : text; } } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

::ng-deep #vector-map { height: 440px; }

import { Injectable } from '@angular/core'; const populations: Object = { China: 19, India: 17.4, 'United States': 4.44, Indonesia: 3.45, Brazil: 2.83, Pakistan: 2.62, Nigeria: 2.42, Bangladesh: 2.18, Russia: 2.04, Japan: 1.77, Mexico: 1.67, Philippines: 1.39, Vietnam: 1.25, Ethiopia: 1.23, Egypt: 1.21, Germany: 1.13, Iran: 1.08, Turkey: 1.07, 'Congo (Kinshasa)': 0.94, France: 0.92, Thailand: 0.9, 'United Kingdom': 0.89, Italy: 0.85, Burma: 0.84, 'South Africa': 0.74, 'S. Korea': 0.7, Colombia: 0.66, Spain: 0.65, Tanzania: 0.63, Kenya: 0.62, Ukraine: 0.6, Argentina: 0.59, Algeria: 0.54, Poland: 0.54, Sudan: 0.52, Canada: 0.49, Uganda: 0.49, Iraq: 0.47, Morocco: 0.46, Uzbekistan: 0.43, }; @Injectable() export class Service { getPopulations(): Object { return populations; } }

<!DOCTYPE html> <html lang="en"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/26.1.5/css/dx.light.css" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> <script src="https://cdn.jsdelivr.net/npm/zone.js@0.16.2/bundles/zone.umd.js"></script> <script src="./bundle.js" type="module"></script> </body> </html>