关于WPF ＧＤＩ＋的问题

[guofu_9070]

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();

[guofu_9070]

没人懂么？