关于WPF ＧＤＩ＋的问题

以前用VS2005（C#）如以下代码，想用VS2010（WPF）来做，请问该怎么改，好多东西不懂，请多多指教
private Bitmap bmp;

 Graphics g2 = this.canvas3.CreateGraphics();
                    System.Drawing.Drawing2D.GraphicsPath gp = new System.Drawing.Drawing2D.GraphicsPath();
                    gp.AddLines(P);

                    Brush b = new SolidBrush(System.Drawing.Color.Black);

                    if (N == M)
                    {
                        b = new SolidBrush(System.Drawing.Color.Black);
                    }
                    else
                    {
                        b = new SolidBrush(System.Drawing.Color.Red);
                    }

                    Graphics g = Graphics.FromImage(bmp);
                    g.FillPath(b, gp);
                    g.Dispose();
                    Pen pen = new Pen(b);
                    g2.FillPath(b, gp);
                    g2.Dispose(); --------------------编程问答-------------------- 没人懂么？

补充：.NET技术 ,  其他语言