zoom.component.ts
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	import { Component, OnInit } from '@angular/core';
	import { Router, ActivatedRoute, Params } from '@angular/router';
	import { TLN_ZOOM_PARAM } from '../constants';
	import { Mapping } from '../route-reader';
	import { RouteUpdater } from '../route-updater';

	@Component({
	selector: 'zoom',
	templateUrl: './zoom.component.html',
	styleUrls: ['./zoom.component.css']
	})
	export class ZoomComponent extends RouteUpdater {
	private readonly increment: number = 0.25;
	private readonly decrement: number = this.increment*-1;
	zoomFactor: number = 1;
	protected mapping: Mapping = { zoomFactor: { param: TLN_ZOOM_PARAM, type: "number" }}

	constructor(protected router: Router, protected activatedRoute: ActivatedRoute ) {
	super(router, activatedRoute);
	}
	private setZoomFactor(newZoomFactor: number){
	if (newZoomFactor > 0){
	this.zoomFactor = Math.round(newZoomFactor*100)/100;
	} else {
	this.zoomFactor = this.zoomFactor/2
	}
	this.updateParams();
	}
	}