Convert HSL color (h: 0-360; s, l: 0-1) to RGB (0-255)

gistfile1.cs

private Tuple<int, int, int> HslToRgb(Tuple<double, double, double> hsl)
{
    double h = hsl.Item1;
    double s = hsl.Item2;
    double l = hsl.Item3;
    int r = 0, g = 0, b = 0;

    double q, p, hk, t, c;

    // set q
    if (l < 0.5)
    {
        q = l * (1 + s);
    }
    else
    {
        q = l + s - l * s;
    }

    // set p
    p = 2 * l - q;

    // set hk
    hk = h / 360;

    // for each color (0: R; 1: G; 2: B)
    for (int i = 0; i < 3; ++i)
    {
        // set t
        t = hk + (1.0 - i) / 3;
        if (t < 0)
        {
            t += 1;
        }
        if (t > 1)
        {
            t -= 1;
        }

        // set c
        if (t < 1.0 / 6)
        {
            c = p + (q - p) * 6 * t;
        }
        else if (t < 1.0 / 2)
        {
            c = q;
        }
        else if (t < 2.0 / 3)
        {
            c = p + (q - p) * 6 * (2.0 / 3 - t);
        }
        else
        {
            c = p;
        }

        c = Math.Truncate(c * 255);

        if (i == 0)
        {
            r = Convert.ToInt32(c);
        }
        else if (i == 1)
        {
            g = Convert.ToInt32(c);
        }
        else
        {
            b = Convert.ToInt32(c);
        }
    }

    return Tuple.Create<int, int, int>(r, g, b);
}