Bitmap bm = new Bitmap(this.pbTraffic.Image);

                BufferedGraphicsContext current = BufferedGraphicsManager.Current;

                BufferedGraphics buf = current.Allocate(pbTraffic.CreateGraphics(), pbTraffic.DisplayRectangle);

                buf.Graphics.Clear(pbTraffic.BackColor);

                buf.Graphics.DrawImage(bm, mx, my, pbTraffic.Width, pbTraffic.Height);

                buf.Render(pbTraffic.CreateGraphics());