Facial expression main UI component file .ts

facial-expression.component.ts

+import { Output } from '@angular/core';
+import { EventEmitter } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
+import { ChartDataSets, ChartType, plugins } from 'chart.js';
+import { Color, Label } from 'ng2-charts';
+import { WebcamImage, WebcamInitError, WebcamUtil } from 'ngx-webcam';
+import { Observable, Subject } from 'rxjs';
+
+
+@Component({
+  selector: 'app-facial-expression',
+  templateUrl: './facial-expression.component.html',
+  styleUrls: ['./facial-expression.component.css'],
+  
+})
+export class FacialExpressionComponent implements OnInit {
+
+  @Output() getPicture = new EventEmitter<WebcamImage>();
+  showWebcam = true;
+  isCameraExist = true;
+
+  errors: WebcamInitError[] = [];
+
+  // webcam snapshot trigger
+  private trigger: Subject<void> = new Subject<void>();
+  private nextWebcam: Subject<boolean | string> = new Subject<boolean | string>();
+
+  constructor() { }
+
+
+  ngOnInit(): void {
+    WebcamUtil.getAvailableVideoInputs()
+      .then((mediaDevices: MediaDeviceInfo[]) => {
+        this.isCameraExist = mediaDevices && mediaDevices.length > 0;
+      });
+  }
+
+  takeSnapshot(): void {
+    this.trigger.next();
+  }
+
+  onOffWebCame() {
+    this.showWebcam = !this.showWebcam;
+  }
+
+  handleInitError(error: WebcamInitError) {
+    this.errors.push(error);
+  }
+
+  changeWebCame(directionOrDeviceId: boolean | string) {
+    this.nextWebcam.next(directionOrDeviceId);
+  }
+
+  handleImage(webcamImage: WebcamImage) {
+    this.getPicture.emit(webcamImage);
+    this.showWebcam = false;
+  }
+
+  get triggerObservable(): Observable<void> {
+    return this.trigger.asObservable();
+  }
+
+  get nextWebcamObservable(): Observable<boolean | string> {
+    return this.nextWebcam.asObservable();
+  }
+
+   
+}