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
<dx-polar-chart
id="radarChart"
[dataSource]="temperaturesData"
title="Average temperature in London"
>
<dxo-common-series-settings type="bar" [opacity]="0.75">
</dxo-common-series-settings>
<dxi-series valueField="day" name="Day" color="#fdff5e"> </dxi-series>
<dxi-series valueField="night" name="Night" color="#0f3b59"> </dxi-series>
<dxo-common-annotation-settings type="text" [opacity]="0.7" [arrowLength]="0">
</dxo-common-annotation-settings>
<dxi-annotation text="WINTER" [angle]="45" [radius]="180"> </dxi-annotation>
<dxi-annotation text="SPRING" [angle]="135" [radius]="180"> </dxi-annotation>
<dxi-annotation text="SUMMER" [angle]="225" [radius]="180"> </dxi-annotation>
<dxi-annotation text="FALL" [angle]="315" [radius]="180"> </dxi-annotation>
<dxi-annotation
[argument]="maxDay.arg"
series="Day"
text="Highest temperature: {{ maxDay.day }} °C"
[opacity]="1"
[offsetX]="105"
[paddingTopBottom]="15"
[paddingLeftRight]="15"
>
</dxi-annotation>
<dxi-annotation
[argument]="minNight.arg"
series="Night"
text="Lowest temperature: {{ minNight.night }} °C"
[opacity]="1"
[offsetX]="105"
[paddingTopBottom]="15"
[paddingLeftRight]="15"
>
</dxi-annotation>
<dxo-argument-axis>
<dxi-strip startValue="December" endValue="February" color="#0076d1">
</dxi-strip>
<dxi-strip startValue="March" endValue="May" color="#3ca3b0"> </dxi-strip>
<dxi-strip startValue="June" endValue="August" color="#3fbc1e"> </dxi-strip>
<dxi-strip startValue="September" endValue="November" color="#f0bb00">
</dxi-strip>
</dxo-argument-axis>
<dxo-legend horizontalAlignment="center" verticalAlignment="bottom">
</dxo-legend>
</dx-polar-chart>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxPolarChartModule } from 'devextreme-angular';
import { Temperature, Service } from './app.service';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
providers: [Service],
})
export class AppComponent {
temperaturesData: Temperature[];
maxDay: any;
minNight: any;
constructor(service: Service) {
this.temperaturesData = service.getTemperaturesData();
this.maxDay = this.temperaturesData.reduce((prev, current) => (prev.day >= current.day ? prev : current));
this.minNight = this.temperaturesData.reduce((prev, current) => (prev.night <= current.night ? prev : current));
}
}
@NgModule({
imports: [
BrowserModule,
BrowserTransferStateModule,
DxPolarChartModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #radarChart {
height: 600px;
}
import { Injectable } from '@angular/core';
export class Temperature {
arg: string;
day: number;
night: number;
}
const temperaturesData: Temperature[] = [{
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,
}];
@Injectable()
export class Service {
getTemperaturesData(): Temperature[] {
return temperaturesData;
}
}
// In real applications, you should not transpile code in the browser.
// You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.exports = window.exports || {};
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'@angular/core': 'npm:@angular/core@12.2.17',
'@angular/platform-browser': 'npm:@angular/platform-browser@12.2.17',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.17',
'@angular/forms': 'npm:@angular/forms@12.2.17',
'@angular/common': 'npm:@angular/common@12.2.17',
'@angular/compiler': 'npm:@angular/compiler@12.2.17',
'tslib': 'npm:tslib@2.3.1/tslib.js',
'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js',
'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@23.1.6/cjs',
'devextreme/bundles/dx.all': 'npm:devextreme@23.1.6/bundles/dx.all.js',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.6.2/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.2',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.49',
'devextreme-angular': 'npm:devextreme-angular@23.1.6',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.4/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.4/parser-html.js',
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts',
},
'devextreme': {
defaultExtension: 'js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
'rxjs': {
defaultExtension: 'js',
},
'rxjs/operators': {
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.12/inferno/package.json',
'npm:@angular/*/package.json',
'npm:@angular/common@12.2.17/*/package.json',
'npm:rxjs@7.5.3/package.json',
'npm:rxjs@7.5.3/operators/package.json',
'npm:devextreme-angular@23.1.6/*/package.json',
'npm:devextreme-angular@23.1.6/ui/*/package.json',
'npm:devextreme-angular@23.1.6/package.json',
'npm:devexpress-diagram@2.2.2/package.json',
'npm:devexpress-gantt@4.1.49/package.json',
],
};
System.config(window.config);
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<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" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.12.0/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.13/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="config.js"></script>
<script>
System.import("app").catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>