/// <summary>
/// Increases the darkness of the color based on the specified <paramref name="percent"/>.
/// </summary>
/// <param name="color">The input color.</param>
/// <param name="percent">The amount of darkness (specified in percent) that should be added to the color.</param>
/// <returns>An instance of <see cref="IColor"/> representing the output color.</returns>
public static IColor Darken(this IColor color, float percent)
{
if (color is IAlphaColor)
{
// Make sure that the color is in the HSLA color space
HslaColor hsla = color as HslaColor ?? color.ToHsla();
// Increase the darkness by the specified percent
double lightness = hsla.Lightness - percent / 100f;
// Return a new HSLA color
return(new HslaColor(hsla.Hue, hsla.Saturation, Math.Min(1, lightness), hsla.Alpha));
}
else
{
// Make sure that the color is in the HSL color space
HslColor hsl = color as HslColor ?? color.ToHsl();
// Increase the darkness by the specified percent
double lightness = hsl.Lightness - percent / 100f;
// Return a new HSL color
return(new HslColor(hsl.Hue, hsl.Saturation, Math.Min(1, lightness)));
}
}
/// <summary>
/// Decreases the saturation of a color in the HSL color space by an absolute amount.
/// </summary>
/// <param name="color">The input color.</param>
/// <param name="percent">A percentage.</param>
/// <returns>An instance of <see cref="IColor"/> representing the output color.</returns>
public static IColor Desaturate(this IColor color, float percent)
{
if (color is IAlphaColor)
{
// Make sure that the color is in the HSLA color space
HslaColor hsla = color as HslaColor ?? color.ToHsla();
// Decrease the saturation by the specified percent
double saturation = hsla.Saturation - percent / 100f;
// Return a new HSLA color
return(new HslaColor(hsla.Hue, Math.Max(0, saturation), hsla.Lightness, hsla.Alpha));
}
else
{
// Make sure that the color is in the HSL color space
HslColor hsl = color as HslColor ?? color.ToHsl();
// Decrease the saturation by the specified percent
double saturation = hsl.Saturation - percent / 100f;
// Return a new HSL color
return(new HslColor(hsl.Hue, Math.Max(0, saturation), hsl.Lightness));
}
}
