Accord.Vision.Tracking.TrackingObject.GetAxis C# (CSharp) Method

        public LineSegment GetAxis(AxisOrientation axis)
        {
            double x1, y1;
            double x2, y2;

            if (axis == AxisOrientation.Horizontal)
            {
                y1 = Math.Cos(-Angle - Math.PI) * Rectangle.Height / 2.0;
                x1 = Math.Sin(-Angle - Math.PI) * Rectangle.Width / 2.0;

                y2 = Math.Cos(-Angle) * Rectangle.Height / 2.0;
                x2 = Math.Sin(-Angle) * Rectangle.Width / 2.0;
            }
            else
            {
                y1 = Math.Cos(-(Angle + Math.PI / 2) - Math.PI) * Rectangle.Height / 2.0;
                x1 = Math.Sin(-(Angle + Math.PI / 2) - Math.PI) * Rectangle.Width / 2.0;

                y2 = Math.Cos(-(Angle + Math.PI / 2)) * Rectangle.Height / 2.0;
                x2 = Math.Sin(-(Angle + Math.PI / 2)) * Rectangle.Width / 2.0;
            }

            Point start = new Point((float)(Center.X + x1), (float)(Center.Y + y1));
            Point end = new Point((float)(Center.X + x2), (float)(Center.Y + y2));

            if (start.DistanceTo(end) == 0)
                return null;

            return new LineSegment(start, end);
        }