All files / src/app/touchpad/geography geography.service.ts

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import { Injectable } from '@angular/core';
import { GeographyProvider, GeoAdminProvider } from './geography-providers';
import { HttpClient } from '@angular/common/http';
import { MapDirections, metersPrecision } from './utils';
 
@Injectable({
  providedIn: 'root'
})
export class GeographyService {
 
  private geographyProvider: GeographyProvider;
 
  constructor(private http: HttpClient) {
    this.geographyProvider = new GeoAdminProvider(this.http);
  }
 
  /**
   * Get the address or water body nearest to a point on a map.
   *
   * @param point An Esri point with WGS84 coordinates near which addresses and water bodies must be searched.
   *
   * @returns The name of the address or water body nearest to the input point.
   */
  getAddress(point: __esri.Point): Promise<string> {
    return this.geographyProvider.getAddress(point);
  }
 
  /**
   * Get the point (coordinates) of an address.
   *
   * @param address The address for which coordinates must be retrieved.
   *
   * @returns An Esri point with the WGS84 coordinates of the input address, or
   * undefined if the address wasn't found.
   */
  getPoint(address: string): Promise<__esri.Point | undefined> {
    return this.geographyProvider.getPoint(address);
  }
 
  /**
   * Get directions from a point A to a point B.
   *
   * @param pointA The Esri point with WGS84 coordinates from which directions must be computed.
   * @param pointB The Esri point with WGS84 coordinates to which directions must be computed.
   *
   * @returns Directions from A to B: the direction to go from A to B, the distance between the points, ...
   */
  async getDirections(pointA: __esri.Point, pointB: __esri.Point): Promise<MapDirections> {
    const directionToB = this.geographyProvider.getDirection(pointA, pointB);
    const distance = await this.geographyProvider.computeDistance(pointA, pointB);
 
    if (distance >= 1000) {
      return {
        reached: false,
        direction: directionToB,
        distance: Math.floor(distance / 1000),
        unit: 'kilometers'
      };
    }
 
    if (distance > metersPrecision) {
      return {
        reached: false,
        direction: directionToB,
        distance: Math.floor(distance),
        unit: 'meters'
      };
    }
 
    return {reached: true};
  }
}