/// <summary>
/// Get tile envelope in WGS-84 coordinates
/// </summary>
/// <param name="x">x index</param>
/// <param name="y">y index</param>
/// <param name="zoom">zoom</param>
/// <returns>Envelope in WGS-84</returns>
private static Envelope GetTileEnvelope(int x, int y, int zoom)
{
var currTopLeftPixXY = TileCalculator.TileXYToTopLeftPixelXY(x, y);
var currTopLeftCoord = TileCalculator.PixelXYToLatLong((int)currTopLeftPixXY.X, (int)currTopLeftPixXY.Y, zoom);
var currBtmRightPixXY = TileCalculator.TileXYToBottomRightPixelXY(x, y);
var currBtmRightCoord = TileCalculator.PixelXYToLatLong((int)currBtmRightPixXY.X, (int)currBtmRightPixXY.Y, zoom);
return(new Envelope(currTopLeftCoord, currBtmRightCoord));
}
/// <summary>
///
/// </summary>
/// <param name="coord"></param>
/// <param name="zoom"></param>
/// <returns></returns>
public Tile GetTileFromLatLong(Coordinate coord, int zoom)
{
var tileXY = TileCalculator.LatLongToTileXY(coord, zoom);
//Figure out the extent of the tile so that it can be made into MWImageData
var tileTopLeftXY = TileCalculator.TileXYToTopLeftPixelXY((int)tileXY.X, (int)tileXY.Y);
var tileBottomRightXY = TileCalculator.TileXYToTopLeftPixelXY((int)tileXY.X + 1, (int)tileXY.Y + 1);
var tileTopLeft = TileCalculator.PixelXYToLatLong((int)tileTopLeftXY.X, (int)tileTopLeftXY.Y, zoom);
var tileBottomRight = TileCalculator.PixelXYToLatLong((int)tileBottomRightXY.X, (int)tileBottomRightXY.Y, zoom);
var envelope = new Envelope(tileTopLeft, tileBottomRight);
return(GetTile(tileXY, envelope, zoom));
}
public Tiles GetTiles(Envelope envelope, Rectangle bounds, BackgroundWorker bw)
{
var mapTopLeft = envelope.TopLeft();
var mapBottomRight = envelope.BottomRight();
//Clip the coordinates so they are in the range of the web mercator projection
mapTopLeft.Y = TileCalculator.Clip(mapTopLeft.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapTopLeft.X = TileCalculator.Clip(mapTopLeft.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
mapBottomRight.Y = TileCalculator.Clip(mapBottomRight.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapBottomRight.X = TileCalculator.Clip(mapBottomRight.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
var zoom = TileCalculator.DetermineZoomLevel(envelope, bounds);
var topLeftTileXY = TileCalculator.LatLongToTileXY(mapTopLeft, zoom);
var btmRightTileXY = TileCalculator.LatLongToTileXY(mapBottomRight, zoom);
var tileMatrix = new Bitmap[(int)(btmRightTileXY.X - topLeftTileXY.X) + 1, (int)(btmRightTileXY.Y - topLeftTileXY.Y) + 1];
var po = new ParallelOptions {
MaxDegreeOfParallelism = -1
};
Parallel.For((int)topLeftTileXY.Y, (int)btmRightTileXY.Y + 1, po,
(y, loopState) => Parallel.For((int)topLeftTileXY.X, (int)btmRightTileXY.X + 1, po,
(x, loopState2) =>
{
if (bw.CancellationPending)
{
loopState.Stop();
loopState2.Stop();
return;
}
var currEnv = GetTileEnvelope(x, y, zoom);
tileMatrix[x - (int)topLeftTileXY.X, y - (int)topLeftTileXY.Y] = GetTile(x, y, currEnv, zoom);
}
));
return(new Tiles(tileMatrix,
GetTileEnvelope((int)topLeftTileXY.X, (int)topLeftTileXY.Y, zoom), // top left tile = tileMatrix[0,0]
GetTileEnvelope((int)btmRightTileXY.X, (int)btmRightTileXY.Y, zoom) // bottom right tile = tileMatrix[last, last]
));
}
/// <summary>
///
/// </summary>
/// <param name="envelope"></param>
/// <param name="bounds"></param>
/// <returns></returns>
public Tile[,] GetTiles(Envelope envelope, Rectangle bounds)
{
Coordinate mapTopLeft = envelope.TopLeft();
Coordinate mapBottomRight = envelope.BottomRight();
//Clip the coordinates so they are in the range of the web mercator projection
mapTopLeft.Y = TileCalculator.Clip(mapTopLeft.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapTopLeft.X = TileCalculator.Clip(mapTopLeft.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
mapBottomRight.Y = TileCalculator.Clip(mapBottomRight.Y, TileCalculator.MinLatitude, TileCalculator.MaxLatitude);
mapBottomRight.X = TileCalculator.Clip(mapBottomRight.X, TileCalculator.MinLongitude, TileCalculator.MaxLongitude);
int zoom = TileCalculator.DetermineZoomLevel(envelope, bounds);
Point topLeftTileXY = TileCalculator.LatLongToTileXY(mapTopLeft, zoom);
Point btmRightTileXY = TileCalculator.LatLongToTileXY(mapBottomRight, zoom);
var tileMatrix = new Tile[(int)(btmRightTileXY.X - topLeftTileXY.X) + 1, (int)(btmRightTileXY.Y - topLeftTileXY.Y) + 1];
Parallel.For((int)topLeftTileXY.Y, (int)btmRightTileXY.Y + 1,
y => Parallel.For((int)topLeftTileXY.X, (int)btmRightTileXY.X + 1,
x =>
{
var currTopLeftPixXY = TileCalculator.TileXYToTopLeftPixelXY(x, y);
var currTopLeftCoord = TileCalculator.PixelXYToLatLong((int)currTopLeftPixXY.X,
(int)currTopLeftPixXY.Y, zoom);
var currBtmRightPixXY = TileCalculator.TileXYToBottomRightPixelXY(x,
y);
var currBtmRightCoord = TileCalculator.PixelXYToLatLong((int)currBtmRightPixXY.X,
(int)currBtmRightPixXY.Y, zoom);
var currEnv = new Envelope(currTopLeftCoord, currBtmRightCoord);
var tile = GetTile(x, y, currEnv, zoom);
tileMatrix[x - (int)topLeftTileXY.X, y - (int)topLeftTileXY.Y] = tile;
}
));
return(tileMatrix);
}
/// <summary>
///
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="envelope"></param>
/// <param name="zoom"></param>
/// <returns></returns>
public Tile GetTile(int x, int y, Envelope envelope, int zoom)
{
Bitmap bitmap = _tileCache.Get(zoom, x, y);
if (null == bitmap)
{
bitmap = GetViaBrutile(x, y, zoom, envelope);
}
if (null != bitmap)
{
var tile = new Tile(x, y, zoom, envelope, bitmap);
return(tile);
}
try
{
string url = _tileServerUrl;
if (url.Contains("{key}"))
{
string quadKey = TileCalculator.TileXYToBingQuadKey(x, y, zoom);
url = url.Replace("{key}", quadKey);
}
else
{
url = url.Replace("{zoom}", zoom.ToString());
url = url.Replace("{x}", x.ToString());
url = url.Replace("{y}", y.ToString());
}
var client = new WebClient();
var stream = client.OpenRead(url);
if (stream != null)
{
bitmap = new Bitmap(stream);
}
var tile = new Tile(x, y, zoom, envelope, bitmap);
if (stream != null)
{
stream.Flush();
stream.Close();
}
//Put the tile in the cache
_tileCache.Put(tile);
return(tile);
}
catch (Exception ex)
{
// We may see a 400 (Bad Request) when the user is zoomed in too far.
Debug.WriteLine(ex.Message);
//Return a No Data Available tile
var noDataTile = new Tile(x, y, zoom, envelope, resources.NoDataTile);
return(noDataTile);
}
}
