コード例 #1
0
 // !!!!  HELPER FUNCTIONS  !!!!
 public List<PointOfInterest> getPlaces(Location start, int timeInMinutes)
 {
     //create query
     //build ("https://maps.googleapis.com/maps/api/place/nearbysearch/output?" + parameters)
     //OR (less data)
     string URI = "https://maps.googleapis.com/maps/api/place/radarsearch/json?";
     //add parameters
     //key
     URI += "key=" + (new Secrets()).GoogleAPIServerKey + "&";
     //location
     URI += "location=" + start.latitude.ToString() + "," + start.longitude.ToString() + "&";
     //radius; estimate 1 meter per second walking speed
     URI += "radius=" + (timeInMinutes * 60 / 2).ToString() + "&";
     //types; start with "park" and possibly add more later
     //see https://developers.google.com/places/supported_types for list of types
     URI += "types=park";
     //create a new, empty list of Points Of Interest
     List<PointOfInterest> candidatePoIs = new List<PointOfInterest>();
     //request processing
     var googleRadarObject = JToken.Parse(callAPIgetJSon(URI));
     var status = googleRadarObject.Children<JProperty>().FirstOrDefault(x => x.Name == "status").Value;
     if (status.ToString() == "OK")
     {
         var resultsArray = googleRadarObject.Children<JProperty>().FirstOrDefault(x => x.Name == "results").Value;
         //iterate over the json and parse into PointsOfInterest, placing each in the list
         foreach (var item in resultsArray)
         {
             //extract the google place id
             string GooglePlaceId = item.Children<JProperty>().FirstOrDefault(x => x.Name == "place_id").Value.ToString();
             //extract the lattitude from JSon structuret
             decimal lat = decimal.Parse(
                 item.Children<JProperty>().FirstOrDefault(x => x.Name == "geometry").Value.
                 Children<JProperty>().FirstOrDefault(x => x.Name == "location").Value.
                 Children<JProperty>().FirstOrDefault(x => x.Name == "lat").Value.ToString());
             //extract the longitude from JSon structure
             decimal lng = decimal.Parse(
                 item.Children<JProperty>().FirstOrDefault(x => x.Name == "geometry").Value.
                 Children<JProperty>().FirstOrDefault(x => x.Name == "location").Value.
                 Children<JProperty>().FirstOrDefault(x => x.Name == "lng").Value.ToString());
             //create new PoI with above properties
             PointOfInterest point = new PointOfInterest(lat, lng, GooglePlaceId);
             //add it to the list of candidates
             candidatePoIs.Add(point);
         }
     }
     //return processed list
     return candidatePoIs;
 }
コード例 #2
0
        public ActionResult Walk(FormCollection collection)
        {
            Location start = new Location(decimal.Parse(collection["startLatitude"]), decimal.Parse(collection["startLongitude"]));
            int time = int.Parse(collection["timeInput"]);

            List<PointOfInterest> radarList = getPlaces(start, time);
            List<PointOfInterest> goldilocks = screenPlaces(radarList, start, time);
            PointOfInterest chosen = null;

                if (goldilocks.Count() > 0)
                {
                    chosen = goldilocks[0];
                }
                else if (radarList.Count() > 0)
                {
                    chosen = radarList[radarList.Count() - 1];
                }

                if (chosen != null)
                {
                    ViewBag.GoogleId = chosen.GooglePlaceId;
                    ViewBag.Latitude = chosen.location.latitude;
                    ViewBag.Longitude = chosen.location.longitude;

                    ViewBag.OriginLat = start.latitude;
                    ViewBag.OriginLon = start.longitude;

                    ViewBag.NoneInRange = false;
                }
                else
                {
                    ViewBag.NoneInRange = true;
                }

                ViewBag.time = time;

            if (chosen != null){
                ViewBag.GoogleId = chosen.GooglePlaceId;
                ViewBag.Latitude = chosen.location.latitude;
                ViewBag.Longitude = chosen.location.longitude;
                ViewBag.NoneInRange = false;
                string poiURL = "http://maps.google.com/maps?q=";
                poiURL += chosen.location.latitude + "," + chosen.location.longitude;
                ViewBag.PoIMapLink = poiURL;
            }
            else
            {
                ViewBag.NoneInRange = true;
            }
            ViewBag.time = time;

            return View();
        }
コード例 #3
0
        List<PointOfInterest> screenPlaces(List<PointOfInterest> candidates, Location start, int timeInMinutes)
        {
            //if the candidates list is empty, return the/an empty list
            if (!(candidates.Any<PointOfInterest>()))
            {
                return candidates;
            }
            //create distance matrix query
            string URI = "https://maps.googleapis.com/maps/api/distancematrix/json?";

            //add parameters
            //key
            URI += "key=" + (new Secrets()).GoogleAPIServerKey + "&";
            //specifiy walking
            URI += "mode=walking&";
            //origin location
            URI += "origins=" + start.latitude.ToString() + "," + start.longitude.ToString() + "&";
            //list all candidate points of interest by lat/lon as destinations
            URI += "destinations=";
            //iterate over candidate destinations, and add each location, separated by a pipe |
            int count = candidates.Count();
            for (int i = 0; i < count; i++)
            {
                URI += candidates[i].getLatitude().ToString() + "," + candidates[i].getLongitude().ToString();
                if (i < count - 1)  // if not the last item in the list
                {
                    URI += "|";     //add a pipe to separate destinations
                }
            }

            List<PointOfInterest> viable = new List<PointOfInterest>();      //create a new empty list
            //calculate Goldilocks range (not too far but also not too close) in seconds
            //use 90-100% of available one-way time to start
            //may need to iterate or otherwise process & if so, should probably save the times instead of make decisions in loop
            //note that these use integer math
            int ceiling = (timeInMinutes * 60) / 2;   //max length of each leg of round trip
            int floor = (ceiling * 9) / 10;           //min length of each leg of round trip

            var client = new WebClient();
            var values = System.Web.HttpUtility.ParseQueryString(string.Empty);
            var result = client.DownloadData(URI.ToString());
            var json = Encoding.UTF8.GetString(result);
            var serializer = new JavaScriptSerializer();
            var distanceResponse = serializer.Deserialize<DistanceResponse>(json);
            //extract elements' travel times
            //remember there is only one destination, so the elements list the times to destinations in order
            if (string.Equals("OK", distanceResponse.Status, StringComparison.OrdinalIgnoreCase))
            {
                var elements = (distanceResponse.Rows[0]).Elements;

                for (int i = 0; i < count; i++)
                {
                    //extract the time in seconds from origin to the current (i'th) destination
                    if (string.Equals("OK", distanceResponse.Status, StringComparison.OrdinalIgnoreCase))
                    {
                        // making a new int value to be able to better understand what the actual value is.
                        int value = elements[i].Duration.Value;
                        //compare to Goldilocks zone to evaluate and add to list if in the range
                        if (value > floor && value <= ceiling)
                        {
                            viable.Add(candidates[i]);
                        }
                    }
                }
            }
            Console.WriteLine(candidates);
            return viable;
        }