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);
}
