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Annotations

Annotations are used to mark a specific area of interest in the gauge with texts, shapes or images.

Content

You can place any custom element on the axis area by assigning the id of the element to content property of annotation object.

Note: To use annotation feature, we need to inject AnnotationsService into the NgModule.providers.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, OnInit } from '@angular/core';

@Component({
    selector: 'app-container',
    template:
    `<ejs-circulargauge id="circular-container">
        <e-axes>
            <e-axis>
                <e-pointers>
                    <e-pointer value = 50></e-pointer>
                </e-pointers>
                <e-annotations>
                    <e-annotation [content]="content">
                    </e-annotation>
                </e-annotations>
            </e-axis>
        </e-axes>
    </ejs-circulargauge>`
})
export class AppComponent implements OnInit {
    public content: string;
    ngOnInit(): void {
        // Initialize objects
        this.content ="<div><div><span>Pointer Value : 50</span></div></div>";
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { CircularGaugeModule } from '@syncfusion/ej2-ng-circulargauge';
import { AnnotationsService } from '@syncfusion/ej2-ng-circulargauge';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, CircularGaugeModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [AnnotationsService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Position

Annotation can be placed around the axis by using radius and angle property. For example, if the angle is 90 degree and the radius is 110%, then the annotation, will be placed at the right side of the axis.

Radius of the annotation takes value either in pixel or percentage. By setting value in percentage, annotation gets its position with respect to its axis radius.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, OnInit } from '@angular/core';

@Component({
    selector: 'app-container',
    template:
    `<ejs-circulargauge id="circular-container">
        <e-axes>
            <e-axis>
                <e-pointers>
                    <e-pointer value = 50></e-pointer>
                </e-pointers>
                <e-annotations>
                    <e-annotation angle=90 radius='150%' [content]="content">
                    </e-annotation>
                </e-annotations>
            </e-axis>
        </e-axes>
    </ejs-circulargauge>`
})
export class AppComponent implements OnInit {
    public content: string;
    ngOnInit(): void {
        // Initialize objects
        this.content ="<div><div><span>Pointer Value : 50</span></div></div>";
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { CircularGaugeModule } from '@syncfusion/ej2-ng-circulargauge';
import { AnnotationsService } from '@syncfusion/ej2-ng-circulargauge';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, CircularGaugeModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [AnnotationsService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Sub Gauge

As the annotation allows you to place any custom element, we can initialize a gauge to the element and can be used to place that in another gauge.

Source
Preview
app.component.ts
app.module.ts
main.ts
import { Component, OnInit } from '@angular/core';
import { CircularGauge } from '@syncfusion/ej2-ng-circulargauge';
import { ILoadedEventArgs } from '@syncfusion/ej2-circulargauge';

@Component({
    selector: 'app-container',
    template:
    `<ejs-circulargauge id="circular-container" (loaded)='loaded($event)'>
        <e-axes>
            <e-axis minimum=0 maximum=12 startAngle=0 endAngle=360 [lineStyle]="lineStyle" [labelStyle]="labelStyle">
                <e-annotations>
                    <e-annotation angle=270 radius='40%' content='<div id="subGauge" style="width:90px;height:90px;"></div>'>
                    </e-annotation>
                    <e-annotation angle=90 radius='40%' content='<div id="subTime"><span>6:30 PM</span></div>'>
                    </e-annotation>
                </e-annotations>
                <e-ranges>
                    <e-range start=0 end=3 color="rgba(29,29,29,0.7)"></e-range>
                    <e-range start=3 end=12 color="rgba(168,145,102,0.1)"></e-range>
                </e-ranges>
                <e-pointers>
                    <e-pointer pointerWidth=5 radius="40%" value=6.5 color="#1d1d1d" [border]='pointerBorder' [cap]='pointerCap' [needleTail]='pointerTail' [animation]='pointerAnimation'></e-pointer>
                    <e-pointer pointerWidth=5 radius="60%" value=6 color="#1d1d1d" [border]='pointerBorder' [cap]='pointerCap' [needleTail]='pointerTail' [animation]='pointerAnimation'></e-pointer>
                    <e-pointer pointerWidth=5 radius="70%" value=9.8 color="#a89166" [cap]='pointerCap1' [needleTail]='pointerTail1' [animation]='pointerAnimation'></e-pointer>
                </e-pointers>
            </e-axis>
        </e-axes>
    </ejs-circulargauge>`
})
export class AppComponent implements OnInit {
    public labelStyle: Object;
    public lineStyle: Object;
    public pointerBorder: Object;
    public pointerCap: Object;
    public pointerTail: Object;
    public pointerAnimation: Object;
    public pointerCap1: Object;
    public pointerTail1: Object;
    public loaded: Function;
    ngOnInit(): void {
        // Initialize objects
        this.labelStyle = {
            hiddenLabel: 'First'
        };
        this.lineStyle = {
            width: 0
        };
        this.pointerBorder= { width: 1, color: 'rgb(29,29,29)' };
        this.pointerCap= {
            color: 'rgb(29,29,29)',
            radius: 0,
            border: {
                width: 0.2,
                color: 'red'
            }
        };
        this.pointerTail= {
            length: '0%'
        };
        this.pointerAnimation= {
            enable: false
        };
        this.pointerCap1= {
            color: 'rgba(168,145,102,1)',
            radius: 4,
            border: {
                width: 0.2,
                color: 'rgba(168,145,102,1)'
            }
        };
        this.pointerTail1= {
            color: 'rgba(168,145,102,1)',
            length: '20%'
        };
        this.loaded = (args: ILoadedEventArgs): void {
            let gauge: CircularGauge = new CircularGauge({
                axes: [{
                    minimum: 0,
                    maximum: 12,
                    startAngle: 0,
                    endAngle: 360,
                    majorTicks:{ interval: 3 },
                    lineStyle: { width: 0 },
                    ranges: [{
                        start: 0, end: 3,
                        startWidth: 5, endWidth: 5,
                        color: 'rgba(29,29,29,0.7)'
                    }, {
                        start: 3, end: 12,
                        startWidth: 5, endWidth: 5,
                        color: 'rgba(168,145,102,0.1)'
                    }],
                    labelStyle: {
                        hiddenLabel: 'First',
                        offset: -5
                    },
                    pointers: [{
                        pointerWidth: 2,
                        radius: '40%',
                        color: 'rgb(29,29,29)',
                        border: { width: 1, color: 'rgb(29,29,29)' },
                        cap: {
                            color: 'rgb(29,29,29)',
                            radius: 2,
                            border: {
                                width: 0.2,
                                color: 'red'
                            }
                        },
                        needleTail: {
                            length: '0%'
                        }, animation: {
                            enable: false
                        }
                    }]
                }]
            }, '#subGauge');
        }
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { CircularGaugeModule } from '@syncfusion/ej2-ng-circulargauge';
import { AnnotationsService } from '@syncfusion/ej2-ng-circulargauge';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, CircularGaugeModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [AnnotationsService]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);