AForge.Math.Random.UniformOneGenerator.Next C# (CSharp) Method

        public double Next()
        {
            return rand.NextDouble();
        }

        /// <summary>
        /// Generate next random number.
        /// </summary>
        ///
        /// <returns>Returns next random number.</returns>
        ///
        public double Next( )
        {
            // check if we can use second value
            if (useSecond)
            {
                // return the second number
                useSecond = false;
                return(secondValue);
            }

            double x1, x2, w, firstValue;

            // generate new numbers
            do
            {
                x1 = rand.Next( ) * 2.0 - 1.0;
                x2 = rand.Next( ) * 2.0 - 1.0;
                w  = x1 * x1 + x2 * x2;
            }while (w >= 1.0);

            w = Math.Sqrt((-2.0 * Math.Log(w)) / w);

            // get two standard random numbers
            firstValue  = x1 * w;
            secondValue = x2 * w;

            useSecond = true;

            // return the first number
            return(firstValue);
        }