Annotation in Angular Accumulation chart component

27 Apr 20248 minutes to read

The annotations are used to mark the specific area of interest in the chart area with texts, shapes or images.

By using the content option of annotation property, you can specify the Id of the element that needs to be displayed in the chart area.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { AccumulationChartModule } from '@syncfusion/ej2-angular-charts'
import { PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationAnnotationService,
  AccumulationDataLabelService } from '@syncfusion/ej2-angular-charts'



import { Component, OnInit } from '@angular/core';
import { pieData } from './datasource';
@Component({
imports: [
         AccumulationChartModule
    ],

providers: [PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationDataLabelService,
     AccumulationAnnotationService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-accumulationchart id="chart-container">
        <e-accumulation-annotations>
            <e-accumulation-annotation content='<div style="border: 1px solid black; background-color:#f5f5f5; padding: 5px 5px 5px 5px">3.5</div>'
             region='Series' coordinateUnits='Point' x='Feb' y=3.5>
            </e-accumulation-annotation>
        </e-accumulation-annotations>
        <e-accumulation-series-collection>
            <e-accumulation-series [dataSource]='piedata' xName='x' yName='y'></e-accumulation-series>
        </e-accumulation-series-collection>
    </ejs-accumulationchart>`
})
export class AppComponent implements OnInit {
    public piedata?: Object[];
    ngOnInit(): void {
        this.piedata = pieData;

}
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Note: To use annotation feature in accumulation chart, we need to inject AccumulationAnnotationService into the @NgModule.providers.

Region

The annotation can be placed with respect to either Series or Chart.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { AccumulationChartModule } from '@syncfusion/ej2-angular-charts'
import { PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationAnnotationService,
  AccumulationDataLabelService } from '@syncfusion/ej2-angular-charts'



import { Component, OnInit } from '@angular/core';
import { pieData } from './datasource';
@Component({
imports: [
         AccumulationChartModule
    ],

providers: [PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationDataLabelService,
     AccumulationAnnotationService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-accumulationchart id="chart-container">
        <e-accumulation-annotations>
            <e-accumulation-annotation content='<div style="border: 1px solid black;background-color:#f5f5f5; padding: 5px 5px 5px 5px">13.5</div>'
             region='Chart' coordinateUnits='Pixel' x=150 y=150>
            </e-accumulation-annotation>
        </e-accumulation-annotations>
        <e-accumulation-series-collection>
            <e-accumulation-series [dataSource]='piedata' xName='x' yName='y'></e-accumulation-series>
        </e-accumulation-series-collection>
    </ejs-accumulationchart>`
})
export class AppComponent implements OnInit {
    public piedata?: Object[];
    ngOnInit(): void {
        this.piedata = pieData;

}
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Co-ordinate Units

Specifies the coordinate units of an annotation either in Pixel or Point.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { AccumulationChartModule } from '@syncfusion/ej2-angular-charts'
import { PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationAnnotationService,
  AccumulationDataLabelService } from '@syncfusion/ej2-angular-charts'



import { Component, OnInit } from '@angular/core';
import { pieData } from './datasource';
@Component({
imports: [
         AccumulationChartModule
    ],

providers: [PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationDataLabelService,
     AccumulationAnnotationService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-accumulationchart id="chart-container">
        <e-accumulation-annotations>
            <e-accumulation-annotation content='<div style="border: 1px solid black;background-color:#f5f5f5; padding: 5px 5px 5px 5px">Jan : 3</div>'
             region='Series' coordinateUnits='Point' x='Jan' y=3>
            </e-accumulation-annotation>
        </e-accumulation-annotations>
        <e-accumulation-series-collection>
            <e-accumulation-series [dataSource]='piedata' xName='x' yName='y'></e-accumulation-series>
        </e-accumulation-series-collection>
    </ejs-accumulationchart>`
})
export class AppComponent implements OnInit {
    public piedata?: Object[];
    ngOnInit(): void {
        this.piedata = pieData;

}
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));

Alignment

The annotations provides the verticalAlignmentor horizontalAlignment properties.
The verticalAlignment property can be customized via Top, Bottom or Middle and the horizontalAlignment property can be customized via Near, Far or Center.

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { AccumulationChartModule } from '@syncfusion/ej2-angular-charts'
import { PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationAnnotationService,
  AccumulationDataLabelService } from '@syncfusion/ej2-angular-charts'



import { Component, OnInit } from '@angular/core';
import { pieData } from './datasource';
@Component({
imports: [
         AccumulationChartModule
    ],

providers: [PieSeriesService, AccumulationLegendService, AccumulationTooltipService, AccumulationDataLabelService,
     AccumulationAnnotationService],
standalone: true,
    selector: 'app-container',
    template: `<ejs-accumulationchart id="chart-container">
        <e-accumulation-annotations>
            <e-accumulation-annotation content='<div style="border: 1px solid black;background-color:#f5f5f5; padding: 5px 5px 5px 5px">Jan : 3</div>'
             region='Series' coordinateUnits='Point' x='Jan' y=3 verticalAlignment='Top' horizontalAlignment='Near'>
            </e-accumulation-annotation>
        </e-accumulation-annotations>
        <e-accumulation-series-collection>
            <e-accumulation-series [dataSource]='piedata' xName='x' yName='y'></e-accumulation-series>
        </e-accumulation-series-collection>
    </ejs-accumulationchart>`
})
export class AppComponent implements OnInit {
    public piedata?: Object[];
    ngOnInit(): void {
        this.piedata = pieData;
    }
}
import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));