Hospital Locator using Bing Maps

Hi Guys,

This time I had a requirement to find the closest hospital from a given location. And map the route to get to that hospital. So I made a small application for that. Hope you like it.

1) ILocationService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

// NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "ILocationService" in both code and config file together.
[ServiceContract]
public interface ILocationService
{
    [OperationContract]
    [WebGet(UriTemplate = "/GetAllLocations",
    ResponseFormat = WebMessageFormat.Json)]
    List<Location> GetAllLocations();

    [OperationContract]
    [WebGet(UriTemplate = "/GetClosestLocation?latitude={latitude}&longtitude={longtitude}",
    ResponseFormat = WebMessageFormat.Json)]
    Location GetClosestLocation(string latitude,string longtitude);

}

2) LocationService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "LocationService" in code, svc and config file together.
public class LocationService : ILocationService
{
    [OperationBehavior]
    public List<Location> GetAllLocations()
{
        using (LocationDataDataContext context = new LocationDataDataContext())
        {
            var temp = (from r in context.Locations
                        where r.IsActive == true
                        select r);
            return temp.ToList();

        }
}

    [OperationBehavior]
    public Location GetClosestLocation(string latitude, string longtitude)
    {
        using (LocationDataDataContext context = new LocationDataDataContext())
        {
            Dictionary<int, double> distances = new Dictionary<int, double>();
            var temp = (from r in context.Locations
                        where r.IsActive == true
                        select r);
            foreach (var item in temp)
            {
              distances.Add(item.ID,GetDistanceBetweenPoints(double.Parse(latitude), double.Parse(longtitude),
                    double.Parse(item.Latitude), double.Parse(item.Longtitude)));
            }

            var min = distances.OrderBy(kvp => kvp.Value).First();
            return (from t in temp
                   where t.ID == min.Key
                   select t).FirstOrDefault();

        }
    }

    private double GetDistanceBetweenPoints(double lat1, double long1, double lat2, double long2)
    {
        double distance = 0;

        double dLat = (lat2 - lat1) / 180 * Math.PI;
        double dLong = (long2 - long1) / 180 * Math.PI;

        double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2)
                    + Math.Cos(lat1 / 180 * Math.PI) * Math.Cos(lat2 / 180 * Math.PI)
                    * Math.Sin(dLong / 2) * Math.Sin(dLong / 2);
        double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));

        //Calculate radius of earth
        // For this you can assume any of the two points.
        double radiusE = 6378135; // Equatorial radius, in metres
        double radiusP = 6356750; // Polar Radius

        //Numerator part of function
        double nr = Math.Pow(radiusE * radiusP * Math.Cos(lat1 / 180 * Math.PI), 2);
        //Denominator part of the function
        double dr = Math.Pow(radiusE * Math.Cos(lat1 / 180 * Math.PI), 2)
                        + Math.Pow(radiusP * Math.Sin(lat1 / 180 * Math.PI), 2);
        double radius = Math.Sqrt(nr / dr);

        //Calculate distance in meters.
        distance = radius * c;
        return distance; // distance in meters
    }

}

3) Default.aspx

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
      <script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>

    <script type="text/javascript">
        var map;
        //var lat, lng;
        var lat = 24.704179, lng = 46.721524;
        var directionsManager;
        var directionsErrorEventObj;
        var directionsUpdatedEventObj;
        $(document).ready(function () {
            Microsoft.Maps.loadModule('Microsoft.Maps.Themes.BingTheme', {
                callback: function () {
                    
                    if (navigator.geolocation) {
                        alert(navigator.geolocation);
                        navigator.geolocation.getCurrentPosition(function (position) {
                            alert(position.coords );
                            lat = position.coords.latitude; lng = position.coords.longitude;
                        }, errorHandler);

                    }

                    

                    map = new Microsoft.Maps.Map(document.getElementById('SDKmap'), {
                        credentials: 'Your Key Here',
                        theme: new Microsoft.Maps.Themes.BingTheme(),
                        width: screen.width / 1.2, height: screen.height / 1.1
                    });
                    var infoboxOptions = { icon: '/Images/Current.png', width: 32, height: 32 };
                    var pushpin = new Microsoft.Maps.Pushpin(map.getCenter(), infoboxOptions);
                    map.entities.push(pushpin);
                  
                    pushpin.setLocation(new Microsoft.Maps.Location(lat, lng));
                    
                }
            });

            $.get("/Services/LocationService.svc/GetAllLocations", function (data, status) {
                if (map) {
                    if (map.entities)
                        map.entities.clear();
                    var pushpinOptions;
                    var pushpin;
                    var infoboxOptions;
                    for (var i = 0; i < data.length; i++) {
                       

                        infoboxOptions = { icon: '/Images/Hospital.png', width: 32, height: 32 };

                        pushpin = new Microsoft.Maps.Pushpin(map.getCenter(), infoboxOptions);
                        map.entities.push(pushpin);
                        pushpin.setLocation(new Microsoft.Maps.Location(
                        data[i].Latitude,
                        data[i].Longtitude));

                    }
                    createDirections();
                }
                
            });


        });

       
        function errorHandler(err) {
            console.warn('ERROR(' + err.code + '): ' + err.message);
        };

        function handlerEvent() {
            alert('Handler clicked');
        }

        function createDirectionsManager() {
            var displayMessage;
            if (!directionsManager) {
                directionsManager = new Microsoft.Maps.Directions.DirectionsManager(map);
                displayMessage = 'Directions Module loaded\n';
                displayMessage += 'Directions Manager loaded';
            }
            console.log(displayMessage);
            directionsManager.resetDirections();
            directionsErrorEventObj = Microsoft.Maps.Events.addHandler(directionsManager, 'directionsError', function (arg) { console.log(arg.message) });
            directionsUpdatedEventObj = Microsoft.Maps.Events.addHandler(directionsManager, 'directionsUpdated', function () { console.log('Directions updated') });
        }

        function createDrivingRoute() {
            if (!directionsManager) { createDirectionsManager(); }

            $.get("/Services/LocationService.svc/GetClosestLocation?latitude="+lat+"&longtitude="+lng, function (data, status) {
                
                directionsManager.resetDirections();
                // Set Route Mode to driving 
                directionsManager.setRequestOptions({ routeMode: Microsoft.Maps.Directions.RouteMode.driving });
                var pointA = new Microsoft.Maps.Directions.Waypoint({

                    location: new Microsoft.Maps.Location(lat, lng)
                });
                directionsManager.addWaypoint(pointA);
                var pointB = new Microsoft.Maps.Directions.Waypoint({

                    location: new Microsoft.Maps.Location(data.Latitude, data.Longtitude)
                });
                directionsManager.addWaypoint(pointB);
                // Set the element in which the itinerary will be rendered
                directionsManager.setRenderOptions({ itineraryContainer: document.getElementById('directionsItinerary') });

                directionsManager.calculateDirections();

                
            });



            
        }

        function createDirections() {
            if (!directionsManager) {
                Microsoft.Maps.loadModule('Microsoft.Maps.Directions', { callback: createDrivingRoute });
            }
            else {
                createDrivingRoute();
            }
        }

        

    </script>
  

    <div id="SDKmap" style="width:500px;height:500px"></div>

   

</asp:Content>

5) Solution and Data