replace code in c# to wpf

protected override void OnPaint(PaintEventArgs pe)
     {
         GraphicsPath p = new GraphicsPath();
         Pen borderPen = new Pen(Color.Red, 3);
         p.AddPolygon(new Point[]
         {
             new Point(-3, this.Height *13/22),
             new Point(this.Width *2/13, -3),
             new Point(this.Width*9/11,0),
             new Point(this.Width,this.Height*2/5),
             new Point(this.Width*6/7,this.Height*170/171),
             new Point(this.Width*2/11,this.Height*170/171)
         });
         this.Region = new Region(p);
 
         if (bold)
         {
             Point[] point = new Point[]
             {
                 new Point(1,this.Height *13/22),
                 new Point(this.Width *2/13, 1),
                 new Point(this.Width*9/11,1),
                 new Point(this.Width*11/17,this.Height *13/22)
             };
             pe.Graphics.DrawPolygon(borderPen, point);
         }
 
         base.OnPaint(pe);
     }