public void bezie()
        {
            double t, tau, sx, sy;
            double  a;
           Graphics g = Graphics.FromHwnd(this.Handle);
            for (t = 0.0; t < 0.5; t += 0.01)
            {
                tau = 1.0;
                sx = x[0];
                sy = y[0];
                a = 1.0;

                for (int i=1;i<n;i++)
                {
                    tau = tau * (1 - t);
                   a = a * (n - i) *(1-t)/ i / t;
                    sx = sx + a * x[i];
                    sy = sy + a * y[i];

                  }
                sx = sx * tau;
                sy = sy * tau;
                g.DrawRectangle (blackBrush, (int)(sx),(int) (sy), 1, 1);
            }

            for (t = 0.5; t < 1.0; t += 0.01)
            {   tau = 1.0;
                sx = x[0];
                sy = y[0];
                a = 1.0;

                 for (int i = n-2; i >=0; i--)
               
                {
                    tau = tau * t;
                    a = a * (1-t) * (i+1)/ t  / (n-i-1);
                    sx = sx + a * x[i];
                    sy = sy + a * y[i];

                }
                sx = sx * tau;
                sy = sy * tau;
                g.DrawRectangle(blackBrush, (int)sx, (int)sy, 1, 1);
            }


        
        }