private void Form1_Load(object sender, EventArgs e)
  {
   g = this.CreateGraphics();
   g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
   g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

   timer1.Start();
  }
  Graphics g;
  double step1 = 0.0;

  private void drup(Point star,ref double step)
  {
   double m = 0.0;
   double s = 0.0;
   for (int i = 0; i < 10; i++)
   {
    double M = s;
    for (int j = 0; j < 10; j++)
    {
     int X = (int)(star.X + i * 30 - 25 * Math.Sin(step - 0.16 + M));
     int Y = (int)(star.Y + j * 30 - 25 * Math.Cos(step+m-0.16));
     g.FillEllipse(new SolidBrush(this.BackColor), new Rectangle(new Point(X - 1, Y - 1), new Size(6, 6)));
     int x = (int)(star.X + i * 30 - 25 * Math.Sin(step+M));
     int y = (int)(star.Y + j * 30 - 25 * Math.Cos(step+m));
     g.FillEllipse(new SolidBrush(Color.White), new Rectangle(new Point(x, y), new Size(4, 4)));//this.Width /2 -300 + i * 20, this.Height / 2 - 300 + j * 20
     M += Math.PI / 12;
     if (j == 1)
      s = M;
    }
    m += Math.PI / 8;
   }
   step += 0.16;
  }
  private void timer1_Tick(object sender, EventArgs e)
  {
   drup(new Point(this.Width / 2 - 100, this.Height / 2 -100),ref step1);
  }