private void Quadratic()
        {
            List<Point> Points = new List<Point>();
            for(int i = 0; i < pointX.Length; i++)
            {
                Points.Add(new Point((int)pointX[i], (int)pointY[i]));
            }

            Point Old;
            Point New;
            int i = 0;

            Old = new Point((Points[i].X + Points[i+1].X)/ 2,(Points[i].Y + Points[i + 1].Y)/ 2);

            for(i = 0; i < Points.Count - 2; i++)
            {
                for(double j = 0; j < 1.0; j+=0.01)
                {
                    New = new Point(0.5 * (1 - j) * (1 - j) * Points[i].X
                        + (0.75 - (j - 0.5) * (j - 0.5)) * Points[i + 1].X
                         + 0.5 * j * j * Points[i + 2].X,
                        0.5 * (1 - j) * (1 - j) * Points[i].Y
                        + (0.75 - (j - 0.5) * (j - 0.5)) * Points[i + 1].Y + 0.5 * j * j * Points[i + 2].Y);
                    Line((int)Old.X, (int)New.X, (int)Old.Y, (int)New.Y, bitmap, Color.Black);
                    Old = new Point(New.X, New.Y);
                }
            }
        }