hue static method

List<double> hue(double value)

Hue adjustment

Implementation

static List<double> hue(double value) {
  value = value * pi;

  if (value == 0) {
    return <double>[
      1,
      0,
      0,
      0,
      0,
      0,
      1,
      0,
      0,
      0,
      0,
      0,
      1,
      0,
      0,
      0,
      0,
      0,
      1,
      0,
    ];
  }

  final double cosVal = cos(value);
  final double sinVal = sin(value);
  const double lumR = 0.213;
  const double lumG = 0.715;
  const double lumB = 0.072;

  return List<double>.from(<double>[
    (lumR + (cosVal * (1 - lumR))) + (sinVal * (-lumR)),
    (lumG + (cosVal * (-lumG))) + (sinVal * (-lumG)),
    (lumB + (cosVal * (-lumB))) + (sinVal * (1 - lumB)),
    0,
    0,
    (lumR + (cosVal * (-lumR))) + (sinVal * 0.143),
    (lumG + (cosVal * (1 - lumG))) + (sinVal * 0.14),
    (lumB + (cosVal * (-lumB))) + (sinVal * (-0.283)),
    0,
    0,
    (lumR + (cosVal * (-lumR))) + (sinVal * (-(1 - lumR))),
    (lumG + (cosVal * (-lumG))) + (sinVal * lumG),
    (lumB + (cosVal * (1 - lumB))) + (sinVal * lumB),
    0,
    0,
    0,
    0,
    0,
    1,
    0,
  ]).map((double i) => i).toList();
}