Farbe per Prozentwert ändern (grün bis rot)

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/// <summary>
/// Gets the color by percent.
/// </summary>
/// <param name="percent">The value 0 - 100%</param>
/// <returns>System.Drawing.Color dependent on the value</returns>
private Color GetColorByValue(double percent)
{
    if (percent > 100.0)
        throw new ArgumentException("percent cannot be larger than 100.0");

    double red;
    double green;

    if (percent > 50.0)
    {
        green = (100.0 - percent) * 5.1;
        red = 255.0;
    }
    else
    {
        green = 255.0;
        red = percent * 5.1;
    }
    return Color.FromArgb((int)red, (int)green, 0);
}