Pie with Resolved Label Overlapping

Documentation

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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Backend API

import React 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']; class App extends React.Component { constructor(props) { super(props); this.state = { resolveMode: resolveModes[0], }; this.setResolveMode = this.setResolveMode.bind(this); } render() { return ( <React.Fragment> <PieChart id="pie" dataSource={dataSource} palette="Bright" title="Olympic Medals in 2008" resolveLabelOverlapping={this.state.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={this.state.resolveMode} onValueChanged={this.setResolveMode} /> </div> </div> </React.Fragment> ); } setResolveMode(data) { this.setState({ resolveMode: data.value, }); } } function formatText(arg) { return `${arg.argumentText} (${arg.percentText})`; } 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>

.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; }

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' };