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Empty Points

The data points those uses the null or undefined as value are considered as empty points. The empty data points are ignored and not plotted in the chart. You can customize those points, using the emptyPointSettings property in series. The default mode of the empty point is Gap. Other supported modes are Average and Zero.

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

@Component({
    selector: 'app-container',
    template:
    `<ejs-accumulationchart id="chart-container">
        <e-accumulation-series-collection>
            <e-accumulation-series [dataSource]='piedata' xName='x' yName='y' radius="100%"
             [emptyPointSettings]='empty'></e-accumulation-series>
        </e-accumulation-series-collection>
    </ejs-accumulationchart>`
})
export class AppComponent implements OnInit {
    public piedata: Object[];
    public empty: Object;
    ngOnInit(): void {
        this.piedata = [
                { x: 'Jan', y: 3, text: 'Jan: 3' }, { x: 'Feb', y: 3.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: null, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' },
                { x: 'May', y: 19, text: 'May: 19' }, { x: 'Jun', y: 23.5, text: 'Jun: 23.5' },
                { x: 'Jul', y: 26, text: 'Jul: 26' }, { x: 'Aug', y: undefined, text: 'Aug: 25' },
                { x: 'Sep', y: 21, text: 'Sep: 21' }, { x: 'Oct', y: 15, text: 'Oct: 15' }];
    }
     this.empty = {
            mode: 'Zero', fill: 'pink', border: { width: 2, color: 'black'}
        }

}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { AccumulationChartModule } from '@syncfusion/ej2-ng-charts';
import { PieSeriesService, AccumulationDataLabelService } from '@syncfusion/ej2-ng-charts';

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

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

Customization

Specific color for an empty point can be set by using the fill property in emptyPointSettings and the border for an empty point can be set by using the border property.

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

@Component({
    selector: 'app-container',
    template:
    `<ejs-accumulationchart id="chart-container">
        <e-accumulation-series-collection>
            <e-accumulation-series [dataSource]='piedata' xName='x' yName='y' [emptyPointSettings]='empty'></e-accumulation-series>
        </e-accumulation-series-collection>
    </ejs-accumulationchart>`
})
export class AppComponent implements OnInit {
    public piedata: Object[];
    public empty: Object;
    ngOnInit(): void {
        this.piedata = [
                { x: 'Jan', y: 3, text: 'Jan: 3' }, { x: 'Feb', y: 3.5, text: 'Feb: 3.5' },
                { x: 'Mar', y: null, text: 'Mar: 7' }, { x: 'Apr', y: 13.5, text: 'Apr: 13.5' },
                { x: 'May', y: 19, text: 'May: 19' }, { x: 'Jun', y: 23.5, text: 'Jun: 23.5' },
                { x: 'Jul', y: 26, text: 'Jul: 26' }, { x: 'Aug', y: undefined, text: 'Aug: 25' },
                { x: 'Sep', y: 21, text: 'Sep: 21' }, { x: 'Oct', y: 15, text: 'Oct: 15' }];
        this.empty = {
            mode: 'Average', fill: 'pink', border: { width: 2, color: 'black'}
        }
    }

}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { AccumulationChartModule } from '@syncfusion/ej2-ng-charts';
import { PieSeriesService, AccumulationDataLabelService } from '@syncfusion/ej2-ng-charts';

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

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