Polar Chart with Annotations

Annotations are containers for images, text blocks, and custom content that display additional information about the visualized data.

To create annotations, populate the PolarChart's annotations array. Each object in the array configures an individual annotation. To specify settings for all annotations, use the commonAnnotationSettings object. Individual settings take precedence over common settings.

You can set each annotation's type property to "text", "image", or "custom". This demo shows only "text" annotations.

You can place annotations at specific coordinates or anchor them to PolarChart elements. This demo illustrates the following annotation placement methods:

Angle and radius properties specify the position of annotations with season names.
Annotations with temperatures are anchored to series points, and the offsetX, paddingTopBottom, and paddingLeftRight properties specify their position.

For more information on annotation settings, refer to the annotations[] help topic.

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Backend API

import React from 'react'; import { PolarChart, CommonSeriesSettings, Series, CommonAnnotationSettings, Annotation, ArgumentAxis, Strip, Legend, } from 'devextreme-react/polar-chart'; import { dataSource, maxDay, minNight } from './data.js'; class App extends React.Component { constructor(props) { super(props); this.maxTempText = `Highest temperature: ${maxDay.day} °C`; this.minTempText = `Lowest temperature: ${minNight.night} °C`; } render() { return ( <PolarChart id="radarChart" dataSource={dataSource} title="Average temperature in London" > <CommonSeriesSettings type="bar" opacity={0.75} /> <Series valueField="day" name="Day" color="#fdff5e" /> <Series valueField="night" name="Night" color="#0f3b59" /> <CommonAnnotationSettings opacity={0.7} arrowLength={0} type="text" /> <Annotation angle={45} radius={180} text="WINTER" /> <Annotation angle={135} radius={180} text="SPRING" /> <Annotation angle={225} radius={180} text="SUMMER" /> <Annotation angle={315} radius={180} text="FALL" /> <Annotation argument={maxDay.arg} opacity={1} offsetX={105} paddingTopBottom={15} paddingLeftRight={15} text={this.maxTempText} series="Day" /> <Annotation argument={minNight.arg} opacity={1} offsetX={105} paddingTopBottom={15} paddingLeftRight={15} text={this.minTempText} series="Night" /> <ArgumentAxis> <Strip startValue="December" endValue="February" color="#0076d1"> </Strip> <Strip startValue="March" endValue="May" color="#3ca3b0"> </Strip> <Strip startValue="June" endValue="August" color="#3fbc1e"> </Strip> <Strip startValue="September" endValue="November" color="#f0bb00"> </Strip> </ArgumentAxis> <Legend horizontalAlignment="center" verticalAlignment="bottom" /> </PolarChart> ); } } 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>

#radarChart { height: 600px; }

export const dataSource = [{ arg: 'December', day: 7, night: 3, }, { arg: 'January', day: 6, night: 2, }, { arg: 'February', day: 7, night: 3, }, { 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: 21, night: 13, }, { arg: 'September', day: 19, night: 11, }, { arg: 'October', day: 15, night: 8, }, { arg: 'November', day: 10, night: 4, }]; export const maxDay = dataSource .reduce((prev, current) => (prev.day >= current.day ? prev : current)); export const minNight = dataSource .reduce((prev, current) => (prev.day <= current.day ? prev : current));