async Task FetchAsync(MapRegion region)
{
const double MaxRadius = 20;
Console.WriteLine($"Querying {lastFetch}");
AmenityNode[] nodes = null;
var centerLat = 0.5 * (region.NearLeft.Latitude + region.FarRight.Latitude);
var centerLng = 0.5 * (region.NearLeft.Longitude + region.FarRight.Longitude);
if (MaxRadius < OverpassClient.GetDiameter(region.NearLeft.Latitude,
region.NearLeft.Longitude,
region.FarRight.Latitude,
region.FarRight.Longitude))
{
nodes = await client.SearchAmenityNodes(new[] { "recycling" }, centerLat, centerLng, MaxRadius);
}
else
{
nodes = await client.SearchAmenityNodes(new[] { "recycling" },
region.NearLeft.Latitude,
region.NearLeft.Longitude,
region.FarRight.Latitude,
region.FarRight.Longitude);
}
foreach (var node in nodes)
{
Nodes[node.Id] = node;
}
var toVisualize = Nodes.Values.OrderBy(x => OverpassClient.GetDistance(
centerLat,
centerLng,
x.Latitude,
x.Longitude)).Take(1000).ToArray();
App.Instance.RunOnUI(() =>
{
Items = toVisualize.Select(x => new Pin
{
Label = "Pin",
Address = "Pin",
Position = new Position(x.Latitude, x.Longitude)
}).ToList();
UpdateProperties();
});
}