darken method

Color darken([
  1. double amount = 0.1
])

Darkens Color by the amount of amount.

Colorをamountの分だけより暗くします。

Implementation

Color darken([double amount = 0.1]) {
  assert(amount >= 0 && amount <= 1);
  final hsl = HSLColor.fromColor(this);
  final hslDark = hsl.withLightness((hsl.lightness - amount).clamp(0.0, 1.0));
  return hslDark.toColor();
}