for (int i = 0, n = mWhiteArray.size(); i < n; i++) {
            Point whitePoint = mWhiteArray.get(i);
            int X = (int) ((whitePoint.x + (1-ratioPieceOfLineHeight)/2)*mLineHeight);
            int Y = (int) ((whitePoint.y + (1-ratioPieceOfLineHeight)/2)*mLineHeight);
            canvas.drawBitmap(mWhitePiece, X, Y, null);
        }