Angular Charts - Step Area with Gaps

The Step Area series uses perpendicular vertical and horizontal lines to connect data points and shades the area under these lines. If a point's value is null, the series draws a gap.

Only null point values result in gaps. undefined values are ignored. Multiple 0 values may look like a gap, but if series points are visible, you can see them in this gap. If you want to remove gaps caused by null values, enable the ignoreEmptyPoints property.

www.wikipedia.org

Backend API

<dx-chart id="chart" [dataSource]="medalsInfo" title="France Olympic Medals"> <dxi-chart-series valueField="gold" name="Gold Medals" color="#ffd700" ></dxi-chart-series> <dxi-chart-series valueField="silver" name="Silver Medals" color="#c0c0c0" ></dxi-chart-series> <dxo-chart-common-series-settings argumentField="year" type="steparea"> <dxo-steparea> <dxo-chart-point [visible]="true"></dxo-chart-point> </dxo-steparea> </dxo-chart-common-series-settings> <dxo-chart-argument-axis> <dxo-chart-label> <dxo-chart-format type="decimal"></dxo-chart-format> </dxo-chart-label> </dxo-chart-argument-axis> <dxo-chart-legend verticalAlignment="bottom" horizontalAlignment="center"> </dxo-chart-legend> <dxo-chart-export [enabled]="true"></dxo-chart-export> </dx-chart>

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DxChartModule } from 'devextreme-angular'; import { Service, MedalsInfo } 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: [ DxChartModule, ], }) export class AppComponent { medalsInfo: MedalsInfo[]; constructor(service: Service) { this.medalsInfo = service.getMedalsInfo(); } } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

::ng-deep #chart { height: 440px; width: 100%; }

import { Injectable } from '@angular/core'; export class MedalsInfo { year: number; gold: number; silver: number; } const medalsInfo: MedalsInfo[] = [{ year: 1904, gold: null, silver: null, }, { year: 1908, gold: 5, silver: 5, }, { year: 1912, gold: 7, silver: 4, }, { year: 1916, gold: null, silver: null, }, { year: 1920, gold: 9, silver: 19, }, { year: 1924, gold: 13, silver: 15, }, { year: 1928, gold: 6, silver: 10, }, { year: 1932, gold: 10, silver: 5, }, { year: 1936, gold: 7, silver: 6, }, { year: 1940, gold: null, silver: null, }, { year: 1944, gold: null, silver: null, }, { year: 1948, gold: 10, silver: 6, }, { year: 1952, gold: 6, silver: 6, }, { year: 1956, gold: 4, silver: 4, }, { year: 1960, gold: null, silver: 2, }, { year: 1964, gold: 1, silver: 8, }, { year: 1968, gold: 7, silver: 3, }, { year: 1972, gold: 2, silver: 4, }, { year: 1976, gold: 2, silver: 3, }, { year: 1980, gold: 6, silver: 5, }, { year: 1984, gold: 5, silver: 7, }, { year: 1988, gold: 6, silver: 4, }, { year: 1992, gold: 8, silver: 5, }, { year: 1996, gold: 15, silver: 7, }, { year: 2000, gold: 13, silver: 14, }, { year: 2004, gold: 11, silver: 9, }, { year: 2008, gold: 7, silver: 16, }, { year: 2012, gold: 11, silver: 11, }, { year: 2016, gold: 18, silver: 18, }]; @Injectable() export class Service { getMedalsInfo(): MedalsInfo[] { return medalsInfo; } }

<!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>