PdfColorHsl constructor

PdfColorHsl(double hue, double saturation, double lightness, [ double alpha = 1.0, ])

Creates an HSL color

Implementation

factory PdfColorHsl(
  double hue,
  double saturation,
  double lightness, [
  double alpha = 1.0,
]) {
  final chroma = (1.0 - (2.0 * lightness - 1.0).abs()) * saturation;
  final secondary = chroma * (1.0 - (((hue / 60.0) % 2.0) - 1.0).abs());
  final match = lightness - chroma / 2.0;

  double red;
  double green;
  double blue;
  if (hue < 60.0) {
    red = chroma;
    green = secondary;
    blue = 0.0;
  } else if (hue < 120.0) {
    red = secondary;
    green = chroma;
    blue = 0.0;
  } else if (hue < 180.0) {
    red = 0.0;
    green = chroma;
    blue = secondary;
  } else if (hue < 240.0) {
    red = 0.0;
    green = secondary;
    blue = chroma;
  } else if (hue < 300.0) {
    red = secondary;
    green = 0.0;
    blue = chroma;
  } else {
    red = chroma;
    green = 0.0;
    blue = secondary;
  }
  return PdfColorHsl._(
    hue,
    saturation,
    lightness,
    alpha,
    (red + match).clamp(0.0, 1.0),
    (green + match).clamp(0.0, 1.0),
    (blue + match).clamp(0.0, 1.0),
  );
}