Ionic4 我想知道谷歌地图io 4的方向

我已经能够实现谷歌地图显示当前，但我想得到一个特定的经度和纬度方向，这将是硬编码请我怎么做，下面是我的打字脚本代码

    import { Component, ViewChild, ElementRef } from "@angular/core";

import { Geolocation } from "@ionic-native/geolocation/ngx";
import {
  NativeGeocoder,
  NativeGeocoderResult,
  NativeGeocoderOptions,
} from "@ionic-native/native-geocoder/ngx";

declare var google;


@Component({
  selector: "app-dashboard",
  templateUrl: "./dashboard.page.html",
  styleUrls: ["./dashboard.page.scss"],
})
export class DashboardPage {
  @ViewChild("map", { static: false }) mapElement: ElementRef;

  start = "chicago, il";
  map: any;
  address: string;

  latitude: number;
  longitude: number;

  constructor(
    private geolocation: Geolocation,
    private nativeGeocoder: NativeGeocoder
  ) {}
  ngOnInit() {
    this.loadMap();
  }

  loadMap() {
    this.geolocation
      .getCurrentPosition()
      .then((resp) => {
        this.latitude = resp.coords.latitude;
        this.longitude = resp.coords.longitude;
        let latLng = new google.maps.LatLng(
          resp.coords.latitude,
          resp.coords.longitude
        );
        let mapOptions = {
          center: latLng,
          zoom: 17,
          mapTypeId: google.maps.MapTypeId.ROADMAP,
        };
        this.getAddressFromCoords(resp.coords.latitude, resp.coords.longitude);
        this.map = new google.maps.Map(
          this.mapElement.nativeElement,
          mapOptions
        );
        
        this.map.addListener("dragend", () => {
          this.latitude = this.map.center.lat();
          this.longitude = this.map.center.lng();

          this.getAddressFromCoords(
            this.map.center.lat(),
            this.map.center.lng()
          );
        });
      })
      .catch((error) => {
        console.log("Error getting location", error);
      });
  }

  getAddressFromCoords(lattitude, longitude) {
    console.log("getAddressFromCoords " + lattitude + " " + longitude);
    let options: NativeGeocoderOptions = {
      useLocale: true,
      maxResults: 5,
    };

    this.nativeGeocoder
      .reverseGeocode(lattitude, longitude, options)
      .then((result: NativeGeocoderResult[]) => {
        this.address = "";
        let responseAddress = [];
        for (let [key, value] of Object.entries(result[0])) {
          if (value.length > 0) responseAddress.push(value);
        }
        responseAddress.reverse();
        for (let value of responseAddress) {
          this.address += value + ", ";
        }
        this.address = this.address.slice(0, -2);
      })
      .catch((error: any) => {
        this.address = "Address Not Available!";
      });
  }
}

请我想这个代码被修改为答案请，如果可能的话，以显示时间之间的距离，我在离子4角使用这个