public override NSUrl URLForTilePath(MKTileOverlayPath path)
{
//Here we write the code for creating the url.
var url = urlTemplate.Replace("{z}", path.Z.ToString()).Replace("{x}", path.X.ToString()).Replace("{y}", path.Y.ToString());
return(new NSUrl(url));
}
public override void LoadTileAtPath(MKTileOverlayPath path, MKTileOverlayLoadTileCompletionHandler result)
{
var key = path.GetKey();
var data = _cache.ObjectForKey(key) as NSData;
if (data != null)
{
result.Invoke(data, null);
return;
}
if (path.Z > MaximumZ)
{
var cut = Normalize(path, MaximumZ);
data = _cache.ObjectForKey(key) as NSData;
if (data != null)
{
result.Invoke(data, null);
return;
}
base.LoadTileAtPath(cut.Path, (tileData, error) =>
{
if (tileData != null)
{
tileData = ProcessImage(tileData, cut);
_cache.SetObjectforKey(tileData, key);
}
result.Invoke(tileData, error);
});
return;
}
base.LoadTileAtPath(path, result);
}
public override NSUrl URLForTilePath(MKTileOverlayPath path)
{
var name = $"logo_xam_{((path.X + path.Y) % 2)}.png";
var file = Path.Combine(NSBundle.MainBundle.BundlePath, name);
return(NSUrl.FromFilename(file));
}
public override void LoadTileAtPath(MKTileOverlayPath path, MKTileOverlayLoadTileCompletionHandler result)
{
NSUrl url = urlForTilePath(path);
NSMutableUrlRequest request = new NSMutableUrlRequest(url);
request.HttpMethod = "GET";
NSUrlSession.SharedSession.CreateDataTask(request, (data, response, error) => {
result(data, null);
}).Resume();
}
public NSUrl urlForTilePath(MKTileOverlayPath path)
{
double left = xOfColumn(path.X, path.Z);
double right = xOfColumn(path.X + 1, path.Z);
double bottom = yOfRow(path.Y + 1, path.Z);
double top = yOfRow(path.Y, path.Z);
string resolvedUrl = urlString + "&BBOX=" + left + "," + bottom + "," + right + "," + top;
return(new NSUrl(resolvedUrl));
}
public override void LoadTileAtPath(MKTileOverlayPath path, MKTileOverlayLoadTileCompletionHandler result)
{
if (TileService != null)
{
Tile tile = TileService.TryGetTile((int)path.X, (int)((int)Math.Pow(2, path.Z) - 1 - path.Y), (int)path.Z);
if (tile != null)
{
NSData tileData = NSData.FromArray(tile.TileData);
result.Invoke(tileData, null);
}
}
}
private CutMapTile Normalize(MKTileOverlayPath path, int maxZoom)
{
var divisor = 1 << ((int)path.Z - maxZoom);
return(new CutMapTile
{
Path = new MKTileOverlayPath
{
ContentScaleFactor = path.ContentScaleFactor,
X = path.X / divisor,
Y = path.Y / divisor,
Z = maxZoom
},
XOffset = path.X % divisor,
YOffset = path.Y % divisor,
Scale = divisor
});
}
public override NSUrl URLForTilePath(MKTileOverlayPath path)
{
var url = string.Format(this.tileUrl, path.Z, path.X, path.Y);
return(NSUrl.FromString(url));
}
public override void LoadTileAtPath(MKTileOverlayPath path, MKTileOverlayLoadTileCompletionHandler result)
{
base.LoadTileAtPath(path, result);
}
public static NSString GetKey(this MKTileOverlayPath path)
{
return(new NSString($"{path.Z}/{path.X}/{path.Y}"));
}
