lighten method

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

Make Color brighter by the amount of amount.

Colorをamountの分だけより明るくします。

Implementation

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