public RasterTile(RasterSource source, RasterTileIdentifier identifier)
{
_level = source.Levels[identifier.Level];
_identifier = identifier;
_west = identifier.X * Level.LongitudePostsPerTile;
_east = Math.Min(_west + Level.LongitudePostsPerTile, Level.LongitudePosts) - 1;
_south = identifier.Y * Level.LatitudePostsPerTile;
_north = Math.Min(_south + Level.LatitudePostsPerTile, Level.LatitudePosts) - 1;
}
public override Texture2D LoadTileTexture(RasterTileIdentifier identifier)
{
int level = identifier.Level;
int longitudeIndex = identifier.X;
int latitudeIndex = identifier.Y;
string cachePath = "esri";
cachePath = Path.Combine(cachePath, level.ToString());
cachePath = Path.Combine(cachePath, latitudeIndex.ToString());
string cacheFilename = Path.Combine(cachePath, longitudeIndex.ToString() + ".jpg");
if (!Directory.Exists(cachePath))
{
Directory.CreateDirectory(cachePath);
}
if (!File.Exists(cacheFilename))
{
// Esri tiles are numbered from the northwest instead of from the southwest.
StringBuilder query = new StringBuilder(_baseUri.AbsoluteUri);
query.Append(level);
query.Append('/');
query.Append((1 << level) - latitudeIndex - 1);
query.Append('/');
query.Append(longitudeIndex);
string queryString = query.ToString();
++_tilesLoaded;
Console.WriteLine("(" + _tilesLoaded + ") Downloading " + queryString);
WebRequest request = WebRequest.Create(queryString);
using (WebResponse response = request.GetResponse())
using (Stream stream = response.GetResponseStream())
using (FileStream file = new FileStream(cacheFilename, FileMode.Create, FileAccess.Write))
{
const int bufferSize = 4096;
byte[] buffer = new byte[bufferSize];
int bytesRead = stream.Read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
file.Write(buffer, 0, bytesRead);
bytesRead = stream.Read(buffer, 0, bufferSize);
}
}
}
Bitmap bitmap = new Bitmap(cacheFilename);
return(Device.CreateTexture2DRectangle(bitmap, TextureFormat.RedGreenBlue8));
}
public RasterTile GetTile(RasterTileIdentifier identifier)
{
RasterTile tile;
if (m_activeTiles.TryGetValue(identifier, out tile))
{
return(tile);
}
// New tiles are not initially active. They become active when loaded.
tile = new RasterTile(this, identifier);
return(tile);
}
public RasterTileRegion[] GetTilesInExtent(int west, int south, int east, int north)
{
int tileXStart = west / LongitudePostsPerTile;
int tileXStop = east / LongitudePostsPerTile;
if (west < 0)
{
--tileXStart;
}
if (east < 0)
{
--tileXStop;
}
int tileYStart = south / LatitudePostsPerTile;
int tileYStop = north / LatitudePostsPerTile;
if (south < 0)
{
--tileYStart;
}
if (north < 0)
{
--tileYStop;
}
int tileWidth = tileXStop - tileXStart + 1;
int tileHeight = tileYStop - tileYStart + 1;
RasterTileRegion[] result = new RasterTileRegion[tileWidth * tileHeight];
int resultIndex = 0;
for (int tileY = tileYStart; tileY <= tileYStop; ++tileY)
{
int tileYOrigin = tileY * LatitudePostsPerTile;
int currentSouth = south - tileYOrigin;
if (currentSouth < 0)
{
currentSouth = 0;
}
int currentNorth = north - tileYOrigin;
if (currentNorth >= LatitudePostsPerTile)
{
currentNorth = LatitudePostsPerTile - 1;
}
for (int tileX = tileXStart; tileX <= tileXStop; ++tileX)
{
int tileXOrigin = tileX * LongitudePostsPerTile;
int currentWest = west - tileXOrigin;
if (currentWest < 0)
{
currentWest = 0;
}
int currentEast = east - tileXOrigin;
if (currentEast >= LongitudePostsPerTile)
{
currentEast = LongitudePostsPerTile - 1;
}
RasterTileIdentifier tileID = new RasterTileIdentifier(_level, tileX, tileY);
RasterTile tile = Source.GetTile(tileID);
result[resultIndex] = new RasterTileRegion(tile, currentWest, currentSouth, currentEast, currentNorth);
++resultIndex;
}
}
return(result);
}
public override Texture2D LoadTileTexture(RasterTileIdentifier identifier)
{
string cachePath = identifier.Level.ToString();
cachePath = Path.Combine(cachePath, identifier.X.ToString());
string cacheFilename = Path.Combine(cachePath, identifier.Y.ToString() + ".bil");
if (!Directory.Exists(cachePath))
{
Directory.CreateDirectory(cachePath);
}
int heightsToRead = TileWidth * TileHeight;
float[] result = new float[heightsToRead];
byte[] data = null;
if (File.Exists(cacheFilename))
{
data = File.ReadAllBytes(cacheFilename);
}
if (data == null || data.Length != heightsToRead * sizeof(short))
{
double divisor = Math.Pow(2.0, identifier.Level);
double longitudeResolution = LevelZeroDeltaLongitudeDegrees / divisor;
double latitudeResolution = LevelZeroDeltaLatitudeDegrees / divisor;
double west = -180.0 + longitudeResolution * identifier.X;
double east = -180.0 + longitudeResolution * (identifier.X + 1);
double south = -90.0 + latitudeResolution * identifier.Y;
double north = -90.0 + latitudeResolution * (identifier.Y + 1);
StringBuilder query = new StringBuilder(_baseUri.AbsoluteUri);
query.Append("&bbox=");
query.Append(west.ToString("0.###########"));
query.Append(',');
query.Append(south.ToString("0.###########"));
query.Append(',');
query.Append(east.ToString("0.###########"));
query.Append(',');
query.Append(north.ToString("0.###########"));
query.Append('&');
string queryString = query.ToString();
++_tilesLoaded;
Console.WriteLine("(" + _tilesLoaded + ") Downloading " + queryString);
int bytesToRead = heightsToRead * 2;
WebRequest request = WebRequest.Create(queryString);
data = new byte[bytesToRead];
using (WebResponse response = request.GetResponse())
using (Stream stream = response.GetResponseStream())
using (FileStream file = new FileStream(cacheFilename, FileMode.Create, FileAccess.Write))
{
int bytesRead = 0;
while (bytesRead < bytesToRead)
{
int bytesReadThisTime = stream.Read(data, bytesRead, bytesToRead - bytesRead);
if (bytesReadThisTime == 0)
{
throw new IOException("Unexpected end of file.");
}
file.Write(data, bytesRead, bytesReadThisTime);
bytesRead += bytesReadThisTime;
}
}
}
// Make the southwest corner the origin instead of the northwest.
int index = 0;
for (int row = TileHeight - 1; row >= 0; --row)
{
int rowIndex = row * TileWidth;
for (int col = 0; col < TileWidth; ++col)
{
result[index++] = BitConverter.ToInt16(data, 2 * (rowIndex + col));
}
}
return(PostsToTexture(result));
}
public abstract Texture2D LoadTileTexture(RasterTileIdentifier identifier);
