React Charts - Pie with Resolved Label Overlapping

In the PieChart, series may include a large number of points, which may result in point label overlapping. This demo illustrates the resolveLabelOverlapping property that allows you to specify how the component must behave when point labels overlap.

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TS JS

Backend API

import React, { useCallback, useState } from 'react'; import SelectBox, { SelectBoxTypes } from 'devextreme-react/select-box'; import PieChart, { Series, Label, Margin, Export, Legend, Animation, IPieChartOptions, } from 'devextreme-react/pie-chart'; import { dataSource, resolutionModeLabel } from './data.ts'; const resolveModes: (IPieChartOptions['resolveLabelOverlapping'])[] = ['shift', 'hide', 'none']; function formatText(arg: { argumentText: string; percentText: string; }) { return `${arg.argumentText} (${arg.percentText})`; } function App() { const [resolveMode, setResolveMode] = useState(resolveModes[0]); const handleResolveModeChange = useCallback((data: SelectBoxTypes.ValueChangedEvent) => { setResolveMode(data.value); }, [setResolveMode]); return ( <React.Fragment> <PieChart id="pie" dataSource={dataSource} palette="Bright" title="Olympic Medals in 2008" resolveLabelOverlapping={resolveMode} > <Series argumentField="country" valueField="medals" > <Label visible={true} customizeText={formatText} /> </Series> <Margin bottom={20} /> <Export enabled={true} /> <Legend visible={false} /> <Animation enabled={false} /> </PieChart> <div className="options"> <div className="caption">Options</div> <div className="option"> <span>Label Overlapping Resolution Mode </span> <SelectBox dataSource={resolveModes} inputAttr={resolutionModeLabel} value={resolveMode} onValueChanged={handleResolveModeChange} /> </div> </div> </React.Fragment> ); } export default App;

import React, { useCallback, useState } from 'react'; import SelectBox from 'devextreme-react/select-box'; import PieChart, { Series, Label, Margin, Export, Legend, Animation, } from 'devextreme-react/pie-chart'; import { dataSource, resolutionModeLabel } from './data.js'; const resolveModes = ['shift', 'hide', 'none']; function formatText(arg) { return `${arg.argumentText} (${arg.percentText})`; } function App() { const [resolveMode, setResolveMode] = useState(resolveModes[0]); const handleResolveModeChange = useCallback( (data) => { setResolveMode(data.value); }, [setResolveMode], ); return ( <React.Fragment> <PieChart id="pie" dataSource={dataSource} palette="Bright" title="Olympic Medals in 2008" resolveLabelOverlapping={resolveMode} > <Series argumentField="country" valueField="medals" > <Label visible={true} customizeText={formatText} /> </Series> <Margin bottom={20} /> <Export enabled={true} /> <Legend visible={false} /> <Animation enabled={false} /> </PieChart> <div className="options"> <div className="caption">Options</div> <div className="option"> <span>Label Overlapping Resolution Mode </span> <SelectBox dataSource={resolveModes} inputAttr={resolutionModeLabel} value={resolveMode} onValueChanged={handleResolveModeChange} /> </div> </div> </React.Fragment> ); } export default App;

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

export const dataSource = [{ country: 'USA', medals: 112, }, { country: 'China', medals: 100, }, { country: 'Russia', medals: 60, }, { country: 'Britain', medals: 49, }, { country: 'Australia', medals: 46, }, { country: 'France', medals: 43, }, { country: 'Germany', medals: 41, }, { country: 'South Korea', medals: 32, }, { country: 'Cuba', medals: 29, }, { country: 'Italy', medals: 27, }, { country: 'Japan', medals: 25, }, { country: 'Ukraine', medals: 22, }, { country: 'Canada', medals: 20, }, { country: 'Spain', medals: 19, }]; export const resolutionModeLabel = { 'aria-label': 'Resolution Mode' };

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

export const dataSource = [ { country: 'USA', medals: 112, }, { country: 'China', medals: 100, }, { country: 'Russia', medals: 60, }, { country: 'Britain', medals: 49, }, { country: 'Australia', medals: 46, }, { country: 'France', medals: 43, }, { country: 'Germany', medals: 41, }, { country: 'South Korea', medals: 32, }, { country: 'Cuba', medals: 29, }, { country: 'Italy', medals: 27, }, { country: 'Japan', medals: 25, }, { country: 'Ukraine', medals: 22, }, { country: 'Canada', medals: 20, }, { country: 'Spain', medals: 19, }, ]; export const resolutionModeLabel = { 'aria-label': 'Resolution Mode' };

<!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/24.2.3/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.tsx"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>

.options { padding: 20px; background-color: rgba(191, 191, 191, 0.15); margin-top: 20px; } .option { margin-top: 10px; display: flex; align-items: center; } .caption { font-size: 18px; font-weight: 500; } .option > span { margin-right: 10px; } .option > .dx-widget { display: inline-block; vertical-align: middle; }