removed mousewheel event handler for updating the graph

src/app/app.component.ts

@@ -34,31 +34,6 @@ export class AppComponent implements OnInit {
   public configForm: FormGroup;
   public scaleOnWheel: boolean;
 
-  @HostListener('mousewheel', ['$event'])
-  private onMousewheel(event) {
-    this.config = {...this.configForm.value};
-
-    if (this.scaleOnWheel) {
-      const delta = Math.sign(event.deltaY);
-      const step = env.controls.wheelStep;
-
-      if (delta > 0) {
-        if (this.config.scale === 1 - step) {
-          return;
-        }
-        this.config.scale += step;
-      } else {
-        if (this.config.scale === step) {
-          return;
-        }
-        this.config.scale -= step;
-      }
-      this.config.scale = Math.round(this.config.scale / step) * step;
-    }
-    this.configForm.reset({...this.config});
-    this.updateGraphs();
-  }
-
   constructor() {
     this.config = env.formDefaults;
     this.configForm = ConfigForm;