private void FloodFill4(Point currentPoint)
		{
		    Point d = currentPoint;
			//additional infos in variable: parameters
			//******************************* student begin *******************************//


			//example for 1. pixel
			//parameters.image.SetPixel(currentPoint.X,currentPoint.Y,parameters.fillColor);

            if(currentPoint.X>0 && currentPoint.X<512  && currentPoint.Y>0 && currentPoint.Y<512 && parameters.image.GetPixel(currentPoint.X,currentPoint.Y) == parameters.colorAtStartPoint)
            {
                parameters.image.SetPixel(currentPoint.X, currentPoint.Y,parameters.fillColor);

                d.X = currentPoint.X + 1;
                FloodFill4(d);
                d.X = currentPoint.X - 1;
                FloodFill4(d);
                d.Y = currentPoint.Y + 1;
                FloodFill4(d);
                d.Y = currentPoint.Y - 1;
                FloodFill4(d);

            }


			//******************************** student end ********************************//
		}