void DrawBSpline(int steps = 10)
        {
            Point[] points = new Point[]
            {
                new Point(0, 0),
                new Point(36, 75),
                new Point(108, 75),
                new Point(135, 0)
            };
            int[] knots = new int[] { 0, 1, 2, 3 };
            Point previous = deBoor(0, 2, 0f, knots);
            for (int i = 1; i < steps; i++)
            {
                float time = (float)i / (steps - 1);
                float t = time * (points.Length - 1);
                Point point = deBoor(0, 2, t, knots);
                //DrawLine(point, previous);
                previous = point;
            }
        }