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

    public void MultiplyTransform(XMatrix matrix)
    {
      //MultiplyTransform(matrix, XMatrixOrder.Prepend);
      XMatrix matrix2 = new XMatrix();  //XMatrix.Identity;
      matrix2.Prepend(matrix);
      AddTransform(matrix2, XMatrixOrder.Prepend);
    }

        private static void RenderToGraphics(Render.RenderContext ctx, int rot, float translateX, float translateY, XGraphics graphics)
        {
            graphics.TranslateTransform(translateX, translateY);
            graphics.RotateTransform(rot * 90);

            using (Maps.Rendering.RenderUtil.SaveState(graphics))
            {

                if (ctx.clipPath != null)
                {
                    XMatrix m = ctx.ImageSpaceToWorldSpace;
                    graphics.MultiplyTransform(m);
                    graphics.IntersectClip(ctx.clipPath);
                    m.Invert();
                    graphics.MultiplyTransform(m);
                }

                ctx.graphics = graphics;
                Maps.Rendering.Render.RenderTile(ctx);
            }


            if (ctx.border && ctx.clipPath != null)
            {
                using (Maps.Rendering.RenderUtil.SaveState(graphics))
                {
                    // Render border in world space
                    XMatrix m = ctx.ImageSpaceToWorldSpace;
                    graphics.MultiplyTransform(m);
                    XPen pen = new XPen(ctx.styles.imageBorderColor, 0.2f);

                    // PdfSharp can't ExcludeClip so we take advantage of the fact that we know 
                    // the path starts on the left edge and proceeds clockwise. We extend the 
                    // path with a counterclockwise border around it, then use that to exclude 
                    // the original path's region for rendering the border.
                    ctx.clipPath.Flatten();
                    RectangleF bounds = PathUtil.Bounds(ctx.clipPath);
                    bounds.Inflate(2 * (float)pen.Width, 2 * (float)pen.Width);
                    List<byte> types = new List<byte>(ctx.clipPath.Internals.GdiPath.PathTypes);
                    List<PointF> points = new List<PointF>(ctx.clipPath.Internals.GdiPath.PathPoints);

                    PointF key = points[0];
                    points.Add(new PointF(bounds.Left, key.Y)); types.Add(1);
                    points.Add(new PointF(bounds.Left, bounds.Bottom)); types.Add(1);
                    points.Add(new PointF(bounds.Right, bounds.Bottom)); types.Add(1);
                    points.Add(new PointF(bounds.Right, bounds.Top)); types.Add(1);
                    points.Add(new PointF(bounds.Left, bounds.Top)); types.Add(1);
                    points.Add(new PointF(bounds.Left, key.Y)); types.Add(1);
                    points.Add(new PointF(key.X, key.Y)); types.Add(1);

                    XGraphicsPath path = new XGraphicsPath(points.ToArray(), types.ToArray(), XFillMode.Winding);
                    graphics.IntersectClip(path);
                    graphics.DrawPath(pen, ctx.clipPath);
                }
            }
        }