darker method
Returns a darker copy of this color.
If k
is specified, it controls how much darker the returned color should
be. If k
is not specified, it defaults to 1. The behavior of this method
is dependent on the implementing color space.
Implementation
@override
Rgb darker([num k = 1]) {
k = math.pow(_darker, k);
return Rgb(r * k, g * k, b * k, opacity);
}