/// <param name="tileX">
/// the X number of the tile. </param>
/// <param name="tileY">
/// the Y number of the tile. </param>
/// <param name="zoomLevel">
/// the zoom level of the tile. </param>
/// <exception cref="IllegalArgumentException">
/// if any of the parameters is invalid. </exception>
public Tile(int tileX, int tileY, sbyte zoomLevel, int tileSize)
{
if (tileX < 0)
{
throw new System.ArgumentException("tileX must not be negative: " + tileX);
}
else if (tileY < 0)
{
throw new System.ArgumentException("tileY must not be negative: " + tileY);
}
else if (zoomLevel < 0)
{
throw new System.ArgumentException("zoomLevel must not be negative: " + zoomLevel);
}
long maxTileNumber = GetMaxTileNumber(zoomLevel);
if (tileX > maxTileNumber)
{
throw new System.ArgumentException("invalid tileX number on zoom level " + zoomLevel + ": " + tileX);
}
else if (tileY > maxTileNumber)
{
throw new System.ArgumentException("invalid tileY number on zoom level " + zoomLevel + ": " + tileY);
}
this.TileSize = tileSize;
this.TileX = tileX;
this.TileY = tileY;
this.ZoomLevel = zoomLevel;
this.MapSize = MercatorProjection.GetMapSize(zoomLevel, tileSize);
}
private static double calculatePriority(Tile tile, MapPosition mapPosition, int tileSize)
{
double tileLatitude = MercatorProjection.TileYToLatitude(tile.TileY, tile.ZoomLevel);
double tileLongitude = MercatorProjection.TileXToLongitude(tile.TileX, tile.ZoomLevel);
int halfTileSize = tileSize / 2;
long mapSize = MercatorProjection.GetMapSize(mapPosition.ZoomLevel, tileSize);
double tilePixelX = MercatorProjection.LongitudeToPixelX(tileLongitude, mapSize) + halfTileSize;
double tilePixelY = MercatorProjection.LatitudeToPixelY(tileLatitude, mapSize) + halfTileSize;
LatLong latLong = mapPosition.LatLong;
double mapPixelX = MercatorProjection.LongitudeToPixelX(latLong.Longitude, mapSize);
double mapPixelY = MercatorProjection.LatitudeToPixelY(latLong.Latitude, mapSize);
double diffPixel = Math.Sqrt(Math.Pow(tilePixelX - mapPixelX, 2) + Math.Pow(tilePixelY - mapPixelY, 2));
int diffZoom = Math.Abs(tile.ZoomLevel - mapPosition.ZoomLevel);
return(diffPixel + PENALTY_PER_ZOOM_LEVEL * tileSize * diffZoom);
}
