public virtual ViewResult Browse(int page = 1, double latitude = 53, double longitude = 8.8, string q = null, int r = 1)
{
var pageSize = 20;
var currentPageIndex = page - 1;
RavenQueryStatistics stats;
var query =
DocumentSession.Advanced.LuceneQuery<Thing, Thing_ByLocation>()
.Statistics(out stats)
.WaitForNonStaleResultsAsOfNow()
.SortByDistance()
.WithinRadiusOf(r, latitude: latitude, longitude: longitude);
if (!string.IsNullOrWhiteSpace(q))
{
query.Search(c => c.Name, q);
}
var items = query.Skip(currentPageIndex * pageSize)
.Take(pageSize)
.ToList();
var pos1 = new Position(latitude, longitude);
foreach (var thing in items)
{
var pos2 = new Position(thing.Latitude, thing.Longitude);
thing.DistanceFromYou = Haversine.Distance(pos1, pos2, DistanceType.Miles);
}
var list = items.ToPagedList(currentPageIndex, pageSize, stats.TotalResults);
var model = new ThingBrowseModel
{
Radius = r,
Query = q,
Radii = new List<SelectListItem>
{
new SelectListItem() { Value = "1", Text = "1 miles", Selected = true },
new SelectListItem() { Value = "2", Text = "2 miles" },
new SelectListItem() { Value = "3", Text = "3 miles" },
new SelectListItem() { Value = "5", Text = "5 miles" },
new SelectListItem() { Value = "10", Text = "10 miles" },
new SelectListItem() { Value = "25", Text = "25 miles" },
},
Things = list
};
return View("Browse", model);
}
/// <summary>
/// Returns the distance in miles or kilometers of any two
/// latitude / longitude points.
/// </summary>
/// <param name="pos1">The pos1.</param>
/// <param name="pos2">The pos2.</param>
/// <param name="type">The type.</param>
/// <returns></returns>
public static double Distance(Position pos1, Position pos2,DistanceType type)
{
double r = (type == DistanceType.Miles) ? 3960 : 6371;
var dLat = ToRadian(pos2.Latitude - pos1.Latitude);
var dLon = ToRadian(pos2.Longitude - pos1.Longitude);
var a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) +
Math.Cos(ToRadian(pos1.Latitude)) *Math.Cos(ToRadian(pos2.Latitude)) *
Math.Sin(dLon / 2) * Math.Sin(dLon / 2);
var c = 2 * Math.Asin(Math.Min(1, Math.Sqrt(a)));
var d = r * c;
return d;
}
