onHsl method Null safety

Chalk onHsl(
  1. num hue,
  2. num saturation,
  3. num lightness
)

Creates chalk with background color defined from HSL (Hue, Saturation and Lightness) color space parameters. https://en.wikipedia.org/wiki/HSL_and_HSV

Implementation

Chalk onHsl(num hue, num saturation, num lightness) {
  var rgb = ColorUtils.hslTorgb(hue, saturation, lightness);
  return makeRGBChalk(rgb[0], rgb[1], rgb[2], bg: true);
}