public static async Task DownloadMap(Models.Map map)
{
//Make sure the folder for the offline maps exists
InitMBTilesFolder();
//Calculate the the sqlite / mbtiles metadata
Point p = Utils.Misc.CalculateCenter(map.BoundsRight, map.BoundsTop, map.BoundsLeft, map.BoundsBottom);
metadataValues metadata = new metadataValues
{
name = map.Name,
description = "Created by hajk",
version = "1",
minzoom = map.ZoomMin.ToString(),
maxzoom = map.ZoomMax.ToString(),
center = p.X.ToString().Replace(",", ".") + "," + p.Y.ToString().Replace(",", "."),
bounds = map.BoundsTop.ToString().Replace(",", ".") + "," + map.BoundsLeft.ToString().Replace(",", ".") + "," + map.BoundsBottom.ToString().Replace(",", ".") + "," + map.BoundsRight.ToString().Replace(",", "."),
format = "png",
type = "png",
};
SQLiteConnection conn = MBTilesWriter.CreateDatabase(MainActivity.rootPath + "/MBTiles/" + map.Name + ".mbtiles", metadata);
if (conn == null)
{
return;
}
for (int zoom = map.ZoomMin; zoom <= map.ZoomMax; zoom++)
{
var leftBottom = Tile.CreateAroundLocation(map.BoundsLeft, map.BoundsBottom, zoom);
var topRight = Tile.CreateAroundLocation(map.BoundsRight, map.BoundsTop, zoom);
var minX = Math.Min(leftBottom.X, topRight.X);
var maxX = Math.Max(leftBottom.X, topRight.X);
var minY = Math.Min(leftBottom.Y, topRight.Y);
var maxY = Math.Max(leftBottom.Y, topRight.Y);
var tiles = new AwesomeTiles.TileRange(minX, minY, maxX, maxY, zoom);
var tilesCount = tiles.Count;
totalTilesCount += tilesCount;
Log.Information($"Need to download {tilesCount} tiles for zoom level {zoom}");
await DownloadTiles(tiles, zoom, conn);
}
conn.Close();
Log.Information($"Done downloading map for {metadata.name}");
}
private static async Task DownloadTiles(AwesomeTiles.TileRange range, int zoom, SQLiteConnection conn)
{
string OSMServer = Preferences.Get("OSMServer", PrefsActivity.OSMServer_s);
//Same, but without parallell processing.
/* foreach (var tile in range)
* {
* byte[] data = null;
* for (int i = 0; i < 10; i++)
* {
* var url = OSMServer + $"{zoom}/{tile.X}/{tile.Y}.png";
* data = await DownloadImageAsync(url);
* if (data != null)
* break;
*
* Thread.Sleep(10000);
* }
*
* Log.Information($"Zoomindex: {zoom}, x/y: {tile.X}/{tile.Y}, ID: {tile.Id}. Done:{++done}/{totalTilesCount}");
* WriteOsmSQlite(data, zoom, tile.X, tile.Y);
* };*/
await range.ParallelForEachAsync(async tile =>
{
byte[] data = null;
for (int i = 0; i < 10; i++)
{
var url = OSMServer + $"{zoom}/{tile.X}/{tile.Y}.png";
data = await DownloadImageAsync(url);
if (data != null)
{
break;
}
Thread.Sleep(10000);
}
Log.Information($"Zoomindex: {zoom}, x/y: {tile.X}/{tile.Y}, ID: {tile.Id}. Done:{++done}/{totalTilesCount}");
WriteOsmSQlite(data, zoom, tile.X, tile.Y, conn);
});
}
/// <summary>
/// Creates a new range center first enumerable.
/// </summary>
/// <param name="tileRange"></param>
public TileRangeCenterFirst(TileRange tileRange)
{
_tileRange = tileRange;
}
/// <summary>
/// Disposes of all resources associated with this object.
/// </summary>
public void Dispose()
{
_range = null;
}
/// <summary>
/// Creates the enumerator.
/// </summary>
/// <param name="range"></param>
public TileRangeCenteredEnumerator(TileRange range)
{
_range = range;
}
public TileRangeEnumerator(TileRange range)
{
_range = range;
}