ComponentFactory.Krypton.Toolkit.KryptonSparkleRenderer.CreateBorderPath C# (CSharp) Method

        private static GraphicsPath CreateBorderPath(Rectangle rect,
                                                     Rectangle exclude,
                                                     float cut)
        {
            // If nothing to exclude, then use quicker method
            if (exclude.IsEmpty)
                return CreateBorderPath(rect, cut);

            // Drawing lines requires we draw inside the area we want
            rect.Width--;
            rect.Height--;

            // Create an array of points to draw lines between
            List<PointF> pts = new List<PointF>();

            float l = rect.X;
            float t = rect.Y;
            float r = rect.Right;
            float b = rect.Bottom;
            float x0 = rect.X + cut;
            float x3 = rect.Right - cut;
            float y0 = rect.Y + cut;
            float y3 = rect.Bottom - cut;
            float cutBack = (cut == 0f ? 1 : cut);

            // Does the exclude intercept the top line
            if ((rect.Y >= exclude.Top) && (rect.Y <= exclude.Bottom))
            {
                float x1 = exclude.X - 1 - cut;
                float x2 = exclude.Right + cut;

                if (x0 <= x1)
                {
                    pts.Add(new PointF(x0, t));
                    pts.Add(new PointF(x1, t));
                    pts.Add(new PointF(x1 + cut, t - cutBack));
                }
                else
                {
                    x1 = exclude.X - 1;
                    pts.Add(new PointF(x1, t));
                    pts.Add(new PointF(x1, t - cutBack));
                }

                if (x3 > x2)
                {
                    pts.Add(new PointF(x2 - cut, t - cutBack));
                    pts.Add(new PointF(x2, t));
                    pts.Add(new PointF(x3, t));
                }
                else
                {
                    x2 = exclude.Right;
                    pts.Add(new PointF(x2, t - cutBack));
                    pts.Add(new PointF(x2, t));
                }
            }
            else
            {
                pts.Add(new PointF(x0, t));
                pts.Add(new PointF(x3, t));
            }

            pts.Add(new PointF(r, y0));
            pts.Add(new PointF(r, y3));
            pts.Add(new PointF(x3, b));
            pts.Add(new PointF(x0, b));
            pts.Add(new PointF(l, y3));
            pts.Add(new PointF(l, y0));

            // Create path using a simple set of lines that cut the corner
            GraphicsPath path = new GraphicsPath();

            // Add a line between each set of points
            for (int i = 1; i < pts.Count; i++)
                path.AddLine(pts[i - 1], pts[i]);

            // Add a line to join the last to the first
            path.AddLine(pts[pts.Count - 1], pts[0]);

            return path;
        }