toHslColor method
Implementation
@override
HslColor toHslColor() {
num hsvSaturation = s / 100;
num value = v / 100;
var lightness = value * (1 - hsvSaturation / 2);
var saturation = lightness == 0 || lightness == 1 ? 0 : (value - lightness) / min(lightness, 1 - lightness);
return HslColor(h, saturation * 100, lightness * 100);
}