Function RGBAtoHSVA

frontend/src/utils/colorUtils.js:153–186

* Converts RGBA to HSVA. Based on formula from https://en.wikipedia.org/wiki/HSL_and_HSV * * @param color RGBA color as an array [0-255, 0-255, 0-255, 0-1]

(rgba)

function RGBAtoHSVA(rgba) {
  if (!rgba) return {
    h: 0,
    s: 1,
    v: 1,
    a: 1
  };
  var r = rgba.r / 255;
  var g = rgba.g / 255;
  var b = rgba.b / 255;
  var max = Math.max(r, g, b);
  var min = Math.min(r, g, b);
  var h = 0;

  if (max !== min) {
    if (max === r) {
      h = 60 * (0 + (g - b) / (max - min));
    } else if (max === g) {
      h = 60 * (2 + (b - r) / (max - min));
    } else if (max === b) {
      h = 60 * (4 + (r - g) / (max - min));
    }
  }

  if (h < 0) h = h + 360;
  var s = max === 0 ? 0 : (max - min) / max;
  var hsv = [h, s, max];
  return {
    h: hsv[0],
    s: hsv[1],
    v: hsv[2],
    a: rgba.a
  };
}

function HSVAtoHSLA(hsva) {
  var h = hsva.h,