zoom.pipe.ts
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	import { Pipe, PipeTransform } from '@angular/core';

	interface ZoomObject {
	zoomFactor: number;
	changeValue: number;
	}

	@Pipe({
	name: 'zoomTitle'
	})
	export class ZoomPipe implements PipeTransform {

	transform(zoom: ZoomObject): string {
	return (zoom.zoomFactor+zoom.changeValue < 0) ? Math.round(zoom.zoomFactor50) + '%' : Math.round((zoom.zoomFactor+zoom.changeValue)100) + '%';
	}

	}