React Charts - Discrete Data

This example demonstrates how to visualize discrete data using the PolarChart component. Months in the data source form discrete categories that divide the PolarChart. In addition, you can spot the difference between series types. Use the drop-down menu below the PolarChart to change the applied series type.

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TS JS

Backend API

import React, { useCallback, useState } from 'react'; import SelectBox, { SelectBoxTypes } from 'devextreme-react/select-box'; import { PolarChart, CommonSeriesSettings, Series, Margin, } from 'devextreme-react/polar-chart'; import { types, dataSource, seriesTypeLabel } from './data.ts'; function App() { const [currentType, setCurrentType] = useState(types[0]); const handleChange = useCallback((e: SelectBoxTypes.ValueChangedEvent) => { setCurrentType(e.value); }, [setCurrentType]); return ( <React.Fragment> <div className="long-title"> <h3>Average temperature in London</h3> </div> <div id="chart-demo"> <PolarChart id="radarChart" dataSource={dataSource} > <CommonSeriesSettings type={currentType} /> <Series valueField="day" name="Day" color="#ba4d51" /> <Series valueField="night" name="Night" color="#5f8b95" /> <Margin top={50} bottom={50} left={100} /> </PolarChart> <div className="center"> <div>Series Type</div>   <SelectBox width={200} inputAttr={seriesTypeLabel} dataSource={types} value={currentType} onValueChanged={handleChange} /> </div> </div> </React.Fragment> ); } export default App;

import React, { useCallback, useState } from 'react'; import SelectBox from 'devextreme-react/select-box'; import { PolarChart, CommonSeriesSettings, Series, Margin, } from 'devextreme-react/polar-chart'; import { types, dataSource, seriesTypeLabel } from './data.js'; function App() { const [currentType, setCurrentType] = useState(types[0]); const handleChange = useCallback( (e) => { setCurrentType(e.value); }, [setCurrentType], ); return ( <React.Fragment> <div className="long-title"> <h3>Average temperature in London</h3> </div> <div id="chart-demo"> <PolarChart id="radarChart" dataSource={dataSource} > <CommonSeriesSettings type={currentType} /> <Series valueField="day" name="Day" color="#ba4d51" /> <Series valueField="night" name="Night" color="#5f8b95" /> <Margin top={50} bottom={50} left={100} /> </PolarChart> <div className="center"> <div>Series Type</div>   <SelectBox width={200} inputAttr={seriesTypeLabel} dataSource={types} value={currentType} onValueChanged={handleChange} /> </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'), );

import { Properties as PolarChartPropsType } from 'devextreme/viz/polar_chart'; export const types: (PolarChartPropsType['commonSeriesSettings']['type'])[] = ['scatter', 'line', 'area', 'bar', 'stackedbar']; export const dataSource = [{ arg: 'January', day: 6, night: 2, }, { arg: 'February', day: 7, night: 2, }, { arg: 'March', day: 10, night: 3, }, { arg: 'April', day: 14, night: 5, }, { arg: 'May', day: 18, night: 8, }, { arg: 'June', day: 21, night: 11, }, { arg: 'July', day: 22, night: 13, }, { arg: 'August', day: 22, night: 13, }, { arg: 'September', day: 19, night: 11, }, { arg: 'October', day: 15, night: 8, }, { arg: 'November', day: 10, night: 5, }, { arg: 'December', day: 7, night: 3, }]; export const seriesTypeLabel = { 'aria-label': 'Series Type' };

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

export const types = ['scatter', 'line', 'area', 'bar', 'stackedbar']; export const dataSource = [ { arg: 'January', day: 6, night: 2, }, { arg: 'February', day: 7, night: 2, }, { arg: 'March', day: 10, night: 3, }, { arg: 'April', day: 14, night: 5, }, { arg: 'May', day: 18, night: 8, }, { arg: 'June', day: 21, night: 11, }, { arg: 'July', day: 22, night: 13, }, { arg: 'August', day: 22, night: 13, }, { arg: 'September', day: 19, night: 11, }, { arg: 'October', day: 15, night: 8, }, { arg: 'November', day: 10, night: 5, }, { arg: 'December', day: 7, night: 3, }, ]; export const seriesTypeLabel = { 'aria-label': 'Series Type' };

<!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/24.1.7/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>

#chart-demo { height: 600px; } #radarChart { height: 500px; } #chart-demo > .center { text-align: center; } #chart-demo > .center > div, #chart-demo > .center > .dx-widget { display: inline-block; vertical-align: middle; } .long-title h3 { font-family: "Segoe UI Light", "Helvetica Neue Light", "Segoe UI", "Helvetica Neue", "Trebuchet MS", Verdana; font-weight: 200; font-size: 28px; text-align: center; margin-bottom: 20px; }