public static int CoordinatesToTileNumber(int clickX, int clickY, int imageW, int imageH, int imageLevels, int magnificationLevel)
        {
            int tileW = 1570,
                tileH = 748;

            //1 - Set correct magnification level
            magnificationLevel = magnificationLevel == 0 ? imageLevels : magnificationLevel;


            //2 - Snap to tile
            //clickX = (int)(Math.Floor(clickX / (double)tileW) * tileW);
            //clickY = (int)(Math.Floor(clickY / (double)tileH) * tileH);

            //2 - Calculate new tileW and tileH
            tileW = (int)(tileW * Math.Pow(2, imageLevels - magnificationLevel));
            tileH = (int)(tileH * Math.Pow(2, imageLevels - magnificationLevel));

            //3 - Get number of tiles per row
            int cntTileX = (int)Math.Ceiling((double)imageW / tileW);

            //4 - Get tile number
            int xNum = (int)Math.Floor((double)clickX / tileW);
            int yNum = (int)Math.Floor((double)clickY / tileH);
            int result = xNum + yNum * cntTileX + 1;

            return result;
        }