private static void WriteOsmSQlite(byte[] osmData, int zoomIndex, int x, int y, SQLiteConnection conn)
{
Tiles.Tools.Tile tile = new Tiles.Tools.Tile()
{
Z = zoomIndex,
Y = y,
X = x
};
MBTilesWriter.WriteTile(conn, tile, osmData);
}
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}");
}