Custom Label in the Center

To customize the doughnut's center, declare the SVG markup in the centerTemplate. This template accepts the PieChart instance. Use this instance to call PieChart methods. For example, call the getInnerRaduis() method to get the radius of the doughnut hole.

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Backend API

import React from 'react'; import PieChart, { Series, Legend, Label, Connector, } from 'devextreme-react/pie-chart'; import { data } from './data.js'; import CenterTemplate from './CenterTemplate.js'; const countries = Array.from(new Set(data.map((item) => item.country))); class App extends React.Component { customizeLabel(e) { return `${e.argumentText}\n${e.valueText}`; } render() { const pies = countries.map((country) => ( <PieChart id="pie-chart" key={country} dataSource={data.filter((i) => i.country === country)} resolveLabelOverlapping="shift" sizeGroup="piesGroup" innerRadius={0.65} centerRender={CenterTemplate} type="doughnut" > <Series argumentField="commodity" valueField="total" > <Label visible={true} format="fixedPoint" customizeText={this.customizeLabel} backgroundColor="none"> <Connector visible={true}></Connector> </Label> </Series> <Legend visible={false}></Legend> </PieChart> )); return ( <div> <div className="long-title"><h3>Energy Production (GWh, 2016)</h3></div> <div className="pies-container"> {pies} </div> </div> ); } } export default App;

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('app'), );

<!DOCTYPE html> <html> <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=1.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/23.1.5/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import("./index.js"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>

.pies-container { margin: auto; width: 800px; } .pies-container > div { width: 400px; float: left; margin-top: -50px; } .long-title h3 { font-weight: 200; font-size: 28px; text-align: center; margin-bottom: 20px; }

import React from 'react'; const formatNumber = new Intl.NumberFormat('en-US', { minimumFractionDigits: 0, }).format; function calculateTotal(pieChart) { return formatNumber(pieChart .getAllSeries()[0] .getVisiblePoints() .reduce((s, p) => s + p.originalValue, 0)); } function getImagePath(country) { return `../../../../images/flags/${country.replace(/\s/, '').toLowerCase()}.svg`; } export default function TooltipTemplate(pieChart) { const { country } = pieChart.getAllSeries()[0].getVisiblePoints()[0].data; return ( <svg> <circle cx="100" cy="100" r={pieChart.getInnerRadius() - 6} fill="#eee"></circle> <image href={getImagePath(country)} x="70" y="58" width="60" height="40" /> <text textAnchor="middle" x="100" y="120" style={{ fontSize: 18, fill: '#494949' }}> <tspan x="100">{country}</tspan> <tspan x="100" dy="20px" style={{ fontWeight: 600 }}>{ calculateTotal(pieChart) }</tspan> </text> </svg> ); }

export const data = [ { country: 'France', commodity: 'Nuclear', total: 413278 }, { country: 'Germany', commodity: 'Nuclear', total: 76536 }, { country: 'France', commodity: 'Thermal', total: 47594 }, { country: 'Germany', commodity: 'Thermal', total: 375809 }, { country: 'France', commodity: 'Wind', total: 21033 }, { country: 'Germany', commodity: 'Wind', total: 58228 }, { country: 'France', commodity: 'Solar', total: 7274 }, { country: 'Germany', commodity: 'Solar', total: 37520 }, { country: 'France', commodity: 'Tidal, Wave', total: 618 }, ];