getHSL method

Map<String, dynamic> getHSL(Map<String, dynamic> target, [ String colorSpace = LinearSRGBColorSpace ])

Implementation

Map<String, dynamic> getHSL(Map<String, dynamic> target, [String colorSpace = LinearSRGBColorSpace]) {
  // h,s,l ranges are in 0.0 - 1.0
  ColorManagement.fromWorkingColorSpace( toComponents( this, _rgb ), colorSpace );

		var r = _rgb["r"], g = _rgb["g"], b = _rgb["b"];

  var max = Math.max3(r!, g!, b!);
  var min = Math.min3(r, g, b);

  var hue, saturation;
  var lightness = (min + max) / 2.0;

  if (min == max) {
    hue = 0;
    saturation = 0;
  } else {
    var delta = max - min;

    saturation =
        lightness <= 0.5 ? delta / (max + min) : delta / (2 - max - min);

    if (max == r) {
      hue = (g - b) / delta + (g < b ? 6 : 0);
    } else if (max == g) {
      hue = (b - r) / delta + 2;
    } else if (max == b) {
      hue = (r - g) / delta + 4;
    }

    hue /= 6;
  }

  target["h"] = hue;
  target["s"] = saturation;
  target["l"] = lightness;

  return target;
}