Angular Charts - Pareto Chart

You can use DevExtreme Chart to visualize data as a Pareto chart and display individual values along with their cumulative totals. In this demo, individual values are numbers of complaints and cumulative totals are given in percentages.

Backend API

<dx-chart id="chart" [dataSource]="dataSource" title="Pizza Shop Complaints" palette="Harmony Light" [valueAxis]="[ { name: 'frequency', position: 'left', tickInterval: 300 }, { name: 'percentage', position: 'right', showZero: true, label: { customizeText: customizeLabelText }, constantLines: [ { value: 80, color: '#fc3535', dashStyle: 'dash', width: 2, label: { visible: false } } ], tickInterval: 20, valueMarginsEnabled: false } ]" > <dxo-chart-argument-axis> <dxo-chart-label overlappingBehavior="stagger"></dxo-chart-label> </dxo-chart-argument-axis> <dxo-chart-tooltip [enabled]="true" [shared]="true" [customizeTooltip]="customizeTooltip" > </dxo-chart-tooltip> <dxo-chart-common-series-settings argumentField="complaint"> </dxo-chart-common-series-settings> <dxi-chart-series type="bar" valueField="count" axis="frequency" name="Complaint frequency" color="#fac29a" > </dxi-chart-series> <dxi-chart-series type="spline" valueField="cumulativePercent" axis="percentage" name="Cumulative percentage" color="#6b71c3" > </dxi-chart-series> <dxo-chart-legend verticalAlignment="top" horizontalAlignment="center"> </dxo-chart-legend> </dx-chart>

import { bootstrapApplication } from '@angular/platform-browser'; import { Component, enableProdMode, provideZoneChangeDetection } from '@angular/core'; import { DxChartModule } from 'devextreme-angular'; import { Service, ComplaintsWithPercent } 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 { dataSource: ComplaintsWithPercent[]; constructor(service: Service) { this.dataSource = service.getComplaintsData(); } customizeTooltip = ({ points, argumentText }) => ({ html: `<div><div class='tooltip-header'>${ argumentText}</div>` + '<div class=\'tooltip-body\'><div class=\'series-name\'>' + `<span class='top-series-name'>${points[0].seriesName}</span>` + ': </div><div class=\'value-text\'>' + `<span class='top-series-value'>${points[0].valueText}</span>` + '</div><div class=\'series-name\'>' + `<span class='bottom-series-name'>${points[1].seriesName}</span>` + ': </div><div class=\'value-text\'>' + `<span class='bottom-series-value'>${points[1].valueText}</span>` + '% </div></div></div>', }); customizeLabelText = ({ valueText }) => `${valueText}%`; } bootstrapApplication(AppComponent, { providers: [ provideZoneChangeDetection({ eventCoalescing: true, runCoalescing: true }), ], });

::ng-deep #chart { height: 440px; } ::ng-deep .tooltip-header { margin-bottom: 5px; font-size: 16px; font-weight: 500; padding-bottom: 5px; border-bottom: 1px solid #c5c5c5; } ::ng-deep .tooltip-body { width: 170px; } ::ng-deep .tooltip-body .series-name { font-weight: normal; opacity: 0.6; display: inline-block; line-height: 1.5; padding-right: 10px; width: 126px; } ::ng-deep .tooltip-body .value-text { display: inline-block; line-height: 1.5; width: 30px; }

import { Injectable } from '@angular/core'; class Complaints { complaint: string; count: number; } export class ComplaintsWithPercent { complaint: string; count: number; cumulativePercent: number; } const complaintsData: Complaints[] = [ { complaint: 'Cold pizza', count: 780 }, { complaint: 'Not enough cheese', count: 120 }, { complaint: 'Underbaked or Overbaked', count: 52 }, { complaint: 'Delayed delivery', count: 1123 }, { complaint: 'Damaged pizza', count: 321 }, { complaint: 'Incorrect billing', count: 89 }, { complaint: 'Wrong size delivered', count: 222 }, ]; @Injectable() export class Service { getComplaintsData(): ComplaintsWithPercent[] { const data = complaintsData.sort((a, b) => b.count - a.count); const totalCount = data.reduce((prevValue, item) => prevValue + item.count, 0); let cumulativeCount = 0; return data.map((item) => { cumulativeCount += item.count; return { complaint: item.complaint, count: item.count, cumulativePercent: Math.round(cumulativeCount * 100 / totalCount), }; }); } }

<!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>

To create a Pareto chart you must:

Configure a Bar series and assign your primary data to this series (specify series.valueField property).
Add a Line or Spline series and assign cumulative total values to this series.
Specify valueAxis.constantLines to illustrate Pareto principle correlations (80/20).