private void SetTileToMemory(uOSMTile tile)
{
if (!memTiles.ContainsKey(tile.Key))
{
memTiles.Add(tile.Key, tile);
if (memTiles.Count > MaxMemTiles)
{
memTiles.Remove(memTiles.Keys.First());
}
}
}
private bool TryLoadTileImage(uOSMTile tile, out Image tileImage)
{
bool result = false;
string tilePath = Path.Combine(DB_Path, uOSMTile.GetRelativePathAndFileName(tile));
tileImage = null;
if (File.Exists(tilePath))
{
try
{
tileImage = Image.FromFile(tilePath);
result = true;
}
catch { }
}
return(result);
}
private bool TrySaveTile(uOSMTile tile)
{
bool result = false;
string tilePath = Path.Combine(DB_Path, uOSMTile.GetRelativePathAndFileName(tile));
string tileDir = Path.GetDirectoryName(tilePath);
try
{
if (!Directory.Exists(tileDir))
{
Directory.CreateDirectory(tileDir);
}
tile.Tile.Save(tilePath);
result = true;
}
catch
{
}
return(result);
}
public List <uOSMTile> GetTiles(int z, int fromx, int tox, int fromy, int toy)
{
List <uOSMTile> result = new List <uOSMTile>();
for (int x = fromx; x <= tox; x++)
{
for (int y = fromy; y <= toy; y++)
{
uOSMTile tile = new uOSMTile(z, x, y);
if (IsTileInMemory(tile))
{
tile.Tile = new Bitmap(memTiles[tile.Key].Tile);
}
else
{
if (TryLoadTileImage(tile, out tile.Tile))
{
SetTileToMemory(tile);
}
else
{
if (TryDownloadTileImage(tile, out tile.Tile))
{
SetTileToMemory(tile);
TrySaveTile(tile);
}
else
{
tile.Tile = (Bitmap)errImage.Clone();
}
}
}
result.Add(tile);
}
}
return(result);
}
private bool TryDownloadTileImage(uOSMTile tile, out Image tileImage)
{
bool result = false;
string url = string.Format(CultureInfo.InvariantCulture, "{0}/{1}", GetNextServer(), uOSMTile.GetRelativeUrl(tile));
tileImage = null;
byte[] bytes = null;
try
{
bytes = httpClient.GetByteArrayAsync(url).ConfigureAwait(false).GetAwaiter().GetResult();
}
catch { }
if (bytes != null)
{
using (MemoryStream ms = new MemoryStream(bytes))
{
tileImage = Image.FromStream(ms);
result = true;
}
}
return(result);
}
private bool IsTileInMemory(uOSMTile tile)
{
return(memTiles.ContainsKey(tile.Key));
}
public static string GetRelativeUrl(uOSMTile tile)
{
return(string.Format(CultureInfo.InvariantCulture, "{0}/{1}/{2}.png", tile.Z, tile.X, tile.Y));
}
public static string GetRelativePathAndFileName(uOSMTile tile)
{
return(string.Format(CultureInfo.InvariantCulture, "{0}\\{1}_{2}.png", tile.Z, tile.X, tile.Y));
}