Ionic directions from current location to particular point

Hello i have some code its working well from a desired location to particular location, but i want to change it to navigate from current location to particular location, how can i make it pick from current location to a particular location ,thank you

import { Component,ViewChild, ElementRef} from ‘@angular/core’;
import { IonicPage, NavController, NavParams,ModalController } from ‘ionic-angular’;
import { AutoPage } from ‘…/auto/auto’;

import { Tab1Root } from ‘…/pages’;
import { Tab2Root } from ‘…/pages’;
import { Tab3Root } from ‘…/pages’;
import { Geolocation } from ‘@ionic-native/geolocation’;
import { ToastController } from ‘ionic-angular’;
import { Http, Headers, RequestOptions } from ‘@angular/http’;
declare var google;

/**

@IonicPage()
@Component({
selector: ‘page-startpage’,
templateUrl: ‘startpage.html’,
})
export class StartpagePage {
address:any;
Start: any;
End: any;
data = {}

//adding current location declarations
@ViewChild(‘map’) mapElement: ElementRef;
map: any;

constructor(public navCtrl: NavController, public navParams: NavParams,
public geolocation: Geolocation,
private modalCtrl: ModalController,
public toastCtrl: ToastController,
public http: Http) {

//autocomplete
this.address = {
  place: ''
};

}

//modal autocomplete
showAddressModal () {
let modal = this.modalCtrl.create(AutoPage);
let me = this;
modal.onDidDismiss(data => {
this.address.place = data;
});
modal.present();
}

//toast
presentToast() {
let toast = this.toastCtrl.create({
message: ‘Trip Saved,Thank You!’,
duration: 3000
});

toast.present();

}
saveTrip(){

var headers = new Headers();
  headers.append("Accept", 'application/json');
  headers.append('Content-Type', 'application/json' );
  let options = new RequestOptions({ headers: headers });

let data = {




            // title: this.title,
            // destination  :this.destination

            title: '',
            destination  :''





        };

         this.http.post("http://127.0.0.1:8000/api/trips", data,options)
      .subscribe(data => {
        console.log(data['_body']);
        // console.log(data);
        // this.data = data._body;

     }, error => {
      console.log(error);// Error getting the data
    });
        console.log(data);

        this.http.post("http://127.0.0.1:8000/api/trips", data,options);

}

//load map current location
ionViewDidLoad(){

this.loadMap();

}

// ngAfterViewInit() {
// console.log(“afterinit”);
// setTimeout(() => {
// console.log(this.abc.nativeElement.innerText);
// }, 1000);
// }

//
loadMap(){

  this.geolocation.getCurrentPosition().then((position) => {

  let latLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);

  let mapOptions = {
    center: latLng,
    zoom: 10,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }

  this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);

}, (err) => {
  console.log(err);
});

}
//adding markers
addMarker(){

let marker = new google.maps.Marker({
map: this.map,
animation: google.maps.Animation.DROP,
position: this.map.getCenter()
});

let content = “

Welcome to Citi Master, This is where you are,!

”;

this.addInfoWindow(marker, content);

}
//adding informaiton winoow when a user taps on the marker
addInfoWindow(marker, content){

let infoWindow = new google.maps.InfoWindow({
content: content
});

google.maps.event.addListener(marker, ‘click’, () => {
infoWindow.open(this.map, marker);
});

}

//calculate route function
calculateAndDisplayRoute(directionsService, directionsDisplay) {

	//initialise map
  //street view variable panaroma

	var directionsService = new google.maps.DirectionsService;
    var directionsDisplay = new google.maps.DirectionsRenderer({
      draggable: true,
      map: map,
      panel: document.getElementById('right-panel')
    });


    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 7,
      center: {lat: 41.85, lng: -87.65}
    });
    directionsDisplay.setMap(map);
    directionsDisplay.addListener('directions_changed', function() {
      // computeTotalDistance(directionsDisplay.getDirections());
    });

    //show street view


    //end of init map function
    directionsService.route({
      origin: this.Start,
      destination: this.End,
      travelMode: 'DRIVING',
      avoidTolls: true,
    }, function(response, status) {
      if (status === 'OK') {
        directionsDisplay.setDirections(response);
      } else {
        window.alert('Directions request failed due to ' + status);
      }
    });


  }

// ionViewDidLoad() {
// console.log(‘ionViewDidLoad StartpagePage’);
// }

}

and this is my html code

i wil be glad for your feedback and solutions.

Can you solve this problem?
I found the same problem with you.