Star Form

int l = 0;
        private void timer1_Tick(object sender, EventArgs e)
        {
            l-=1;
            System.Drawing.Drawing2D.GraphicsPath g = new System.Drawing.Drawing2D.GraphicsPath();
            for (int i = 0; i <= 360; i+=20)
            {
                g.AddLine((float)Math.Cos(Math.PI * (i+l) / 180) * this.Width / 2 + this.Width / 2
                    , (float)Math.Sin(Math.PI * (i+l) / 180) * this.Height / 2 + this.Height / 2,
                    (float)Math.Cos(Math.PI * (i +l) / 180) * this.Width / 4 + this.Width / 2,
                    (float)Math.Sin(Math.PI * (i+l) / 180) * this.Height / 4 + this.Height / 2);
            }
            this.Region = new Region(g);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.Width = 300;
            this.Height = 300;
        }