JoshClose

public static class ColorExtensions
{
    /// <summary>
    /// Tints the color by the given percent.
    /// </summary>
    /// <param name="color">The color being tinted.</param>
    /// <param name="percent">The percent to tint. Ex: 0.1 will make the color 10% lighter.</param>
    /// <returns>The new tinted color.</returns>
    public static Color Lighten( this Color color, float percent )
    {

aslakhellesoy

/** round n down to nearest multiple of m */
long roundDown(long n, long m) {
    return n >= 0 ? (n / m) * m : ((n - m + 1) / m) * m;
}

/** round n up to nearest multiple of m */
long roundUp(long n, long m) {
    return n >= 0 ? ((n + m - 1) / m) * m : (n / m) * m;
}