PdfSharp.Drawing.XGraphics.Restore C# (CSharp) Method

    public void Restore()
    {
      if (this.gsStack.Count == 0)
        throw new InvalidOperationException("Cannot restore without preceding save operation.");
      Restore(this.gsStack.Current.state);
    }

    /// <summary>
    /// Demonstrates the use of XGraphics.Transform.
    /// </summary>
    public override void RenderPage(XGraphics gfx)
    {
      base.RenderPage(gfx);

      //XGraphicsState state = gfx.Save();

      gfx.Save();
      gfx.IntersectClip(new XRect(20, 20, 300, 500));
      gfx.DrawRectangle(XBrushes.Yellow, 0, 0, gfx.PageSize.Width, gfx.PageSize.Height);
      gfx.Restore();

      gfx.Save();
      gfx.IntersectClip(new XRect(100, 200, 300, 500));
      gfx.DrawRectangle(XBrushes.LightBlue, 0, 0, gfx.PageSize.Width, gfx.PageSize.Height);

      gfx.DrawLine(XPens.MediumSlateBlue, 0, 0, 150, 200);
      gfx.DrawPolygon(properties.Pen1.Pen, GetPentagram(75, new PointF(150, 200)));


      Matrix matrix = new Matrix();
      //matrix.Scale(2f, 1.5f);
      //matrix.Translate(-200, -400);
      //matrix.Rotate(45);
      //matrix.Translate(200, 400);
      //gfx.Transform = matrix;
      //gfx.TranslateTransform(50, 30);

#if true
      gfx.TranslateTransform(30, 40, XMatrixOrder.Prepend);
      gfx.ScaleTransform(2.0f, 2.0f, XMatrixOrder.Prepend);
      gfx.RotateTransform(15, XMatrixOrder.Prepend);
#else
      gfx.TranslateTransform(30, 40, XMatrixOrder.Append);
      gfx.ScaleTransform(2.0f, 2.0f, XMatrixOrder.Append);
      gfx.RotateTransform(15, XMatrixOrder.Append);
#endif
      bool id = matrix.IsIdentity;
      matrix.Scale(2.0f, 2.0f, MatrixOrder.Prepend);
      //matrix.Translate(30, -50);
      matrix.Rotate(15, MatrixOrder.Prepend);
      //Matrix mtx = gfx.Transform.ToGdiMatrix();
      //gfx.Transform = matrix;

      gfx.DrawLine(XPens.MediumSlateBlue, 0, 0, 150, 200);
      gfx.DrawPolygon(properties.Pen2.Pen, GetPentagram(75, new PointF(150, 200)));

      gfx.Restore();

      gfx.DrawLine(XPens.Red, 0, 0, 1000, 1000);

      gfx.DrawPolygon(XPens.SandyBrown, GetPentagram(75, new PointF(150, 200)));

    }