public static async Task <BusStop[]> GetStopsForArea(BasicGeoposition topLeft, BasicGeoposition bottomRight, CancellationToken cancellationToken)
{
List <int> hashes = new List <int>();
GeoboundingBox box = new GeoboundingBox(topLeft, bottomRight);
Rect intersection = box.ToRect();
intersection.Intersect(DowntownSeattleZone.ToRect());
if (intersection.Width > 0 && intersection.Height > 0)
{
hashes.Add(16);
}
if (intersection != box.ToRect())
{
double minLat = bottomRight.Latitude;
double minLon = topLeft.Longitude;
double maxLat = topLeft.Latitude;
double maxLon = bottomRight.Longitude;
for (double lat = minLat; lat < maxLat + 0.1; lat += 0.1)
{
if (lat > maxLat)
{
lat = maxLat;
}
for (double lon = minLon; lon < maxLon + 0.2; lon += 0.2)
{
if (lon > maxLon)
{
lon = maxLon;
}
int hash = HashLocation(lat, lon);
if (!hashes.Contains(hash))
{
hashes.Add(hash);
}
}
}
}
cancellationToken.ThrowIfCancellationRequested();
List <BusStop> result = new List <BusStop>();
foreach (var hash in hashes)
{
await AccessStopCache(hash, delegate(List <BusStop> stops)
{
foreach (var stop in stops)
{
if (box.ContainsPoint(stop.Position) && !result.Contains(stop))
{
result.Add(stop);
}
}
return(false);
});
cancellationToken.ThrowIfCancellationRequested();
}
return(result.ToArray());
}
public static int HashLocation(double latitude, double longitude)
{
if (DowntownSeattleZone.ContainsPoint(new BasicGeoposition()
{
Latitude = latitude, Longitude = longitude
}))
{
return(16);
}
int latHash = (int)(Abs(latitude) / 0.1) % 4;
int lonHash = (int)(Abs(longitude) / 0.2) % 4;
return(latHash + 4 * lonHash);
}
public static async Task<BusStop[]> GetStopsForArea(BasicGeoposition topLeft, BasicGeoposition bottomRight, CancellationToken cancellationToken)
{
List<int> hashes = new List<int>();
GeoboundingBox box = new GeoboundingBox(topLeft, bottomRight);
Rect intersection = box.ToRect();
intersection.Intersect(DowntownSeattleZone.ToRect());
if (intersection.Width > 0 && intersection.Height > 0)
hashes.Add(16);
if (intersection != box.ToRect())
{
double minLat = bottomRight.Latitude;
double minLon = topLeft.Longitude;
double maxLat = topLeft.Latitude;
double maxLon = bottomRight.Longitude;
for (double lat = minLat; lat < maxLat + 0.1; lat += 0.1)
{
if (lat > maxLat)
lat = maxLat;
for (double lon = minLon; lon < maxLon + 0.2; lon += 0.2)
{
if (lon > maxLon)
lon = maxLon;
int hash = HashLocation(lat, lon);
if (!hashes.Contains(hash))
hashes.Add(hash);
}
}
}
cancellationToken.ThrowIfCancellationRequested();
List<BusStop> result = new List<BusStop>();
foreach (var hash in hashes)
{
await AccessStopCache(hash, delegate (List<BusStop> stops)
{
foreach (var stop in stops)
{
if (box.ContainsPoint(stop.Position) && !result.Contains(stop))
result.Add(stop);
}
return false;
});
cancellationToken.ThrowIfCancellationRequested();
}
return result.ToArray();
}
