ZFX + Developia

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        //any quadratic control points
        Vector q0 = new Vector(-600, 230);
        Vector q1 = new Vector(-400, -10);
        Vector q2 = new Vector(450, 100);

        //corresponding cubic control points
        Vector c0 = q0;
        Vector c1 = q0 + (q1 - q0) * 2 / 3;
        Vector c2 = q2 + (q1 - q2) * 2 / 3;
	Vector c3 = q2;

        int n = 20;
        for(int i = 0; i < n; i++)
        {
       	    float t = (float)i / n;
            Vector qt = getQuadratic(t, q0, q1, q2);
            Vector ct = getCubic(t, c0, c1, c2, c3);
            Console.WriteLine((qt-ct).Length);
        }


        private Vector getQuadratic(float t, Vector q0, Vector q1, Vector q2)
        {
            Vector a0 = q0 * (1 - t) + q1 * t;
            Vector a1 = q1 * (1 - t) + q2 * t;
            Vector vt = a0 * (1 - t) + a1 * t;
            return vt;
        }

        private Vector getCubic(float t, Vector c0, Vector c1, Vector c2, Vector c3)
        {
            Vector a0 = c0 * (1 - t) + c1 * t;
            Vector a1 = c1 * (1 - t) + c2 * t;
            Vector a2 = c2 * (1 - t) + c3 * t;
            Vector b0 = a0 * (1 - t) + a1 * t;
            Vector b1 = a1 * (1 - t) + a2 * t;
            Vector vt = b0 * (1 - t) + b1 * t; 
            return vt;
        }