Angular Charts - Discrete Data

This example demonstrates how to visualize discrete data using the PolarChart component. Months in the data source form discrete categories that divide the PolarChart. In addition, you can spot the difference between series types. Use the drop-down menu below the PolarChart to change the applied series type.

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Backend API

<div class="long-title"> <h3>Average temperature in London</h3> </div> <div id="chart-demo"> <dx-polar-chart id="radarChart" [dataSource]="temperaturesData"> <dxi-polar-chart-series valueField="day" name="Day" color="#ba4d51" ></dxi-polar-chart-series> <dxi-polar-chart-series valueField="night" name="Night" color="#5f8b95" ></dxi-polar-chart-series> <dxo-polar-chart-common-series-settings #seriesSettings type="scatter"> </dxo-polar-chart-common-series-settings> <dxo-polar-chart-margin [top]="50" [bottom]="50" [left]="100"> </dxo-polar-chart-margin> </dx-polar-chart> <div class="center"> <div>Series Type</div>  <dx-select-box [dataSource]="types" [(value)]="seriesSettings.type" [inputAttr]="{ 'aria-label': 'Series Type' }" [width]="200" > </dx-select-box> </div> </div>

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DxPolarChartModule, DxSelectBoxModule } from 'devextreme-angular'; import { Temperature, Service } from './app.service'; if (!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: './app.component.html', styleUrls: ['./app.component.css'], providers: [Service], imports: [ DxPolarChartModule, DxSelectBoxModule, ], }) export class AppComponent { temperaturesData: Temperature[]; types = ['scatter', 'line', 'area', 'bar', 'stackedbar']; constructor(service: Service) { this.temperaturesData = service.getTemperaturesData(); } } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

::ng-deep #chart-demo { height: 600px; } ::ng-deep #radarChart { height: 500px; } ::ng-deep #chart-demo > .center { text-align: center; } ::ng-deep #chart-demo > .center > div, ::ng-deep #chart-demo > .center > .dx-widget { display: inline-block; vertical-align: middle; } ::ng-deep .long-title h3 { font-family: 'Segoe UI Light', 'Helvetica Neue Light', 'Segoe UI', 'Helvetica Neue', 'Trebuchet MS', Verdana; font-weight: 200; font-size: 28px; text-align: center; margin-bottom: 20px; }

import { Injectable } from '@angular/core'; export class Temperature { arg: string; day: number; night: number; } const temperaturesData: Temperature[] = [{ arg: 'January', day: 6, night: 2, }, { arg: 'February', day: 7, night: 2, }, { arg: 'March', day: 10, night: 3, }, { arg: 'April', day: 14, night: 5, }, { arg: 'May', day: 18, night: 8, }, { arg: 'June', day: 21, night: 11, }, { arg: 'July', day: 22, night: 13, }, { arg: 'August', day: 22, night: 13, }, { arg: 'September', day: 19, night: 11, }, { arg: 'October', day: 15, night: 8, }, { arg: 'November', day: 10, night: 5, }, { arg: 'December', day: 7, night: 3, }]; @Injectable() export class Service { getTemperaturesData(): Temperature[] { return temperaturesData; } }

<!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" /> </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>