NewTOAPIA.Drawing.image_filter_lanczos.calc_weight C# (CSharp) Method

        public double calc_weight(double x)
        {
            if (x == 0.0) return 1.0;
            if (x > m_radius) return 0.0;
            x *= Math.PI;
            double xr = x / m_radius;
            return (Math.Sin(x) / x) * (Math.Sin(xr) / xr);
        }
        private double m_radius;