Function rgba2hex

packages/core/src/model/color.ts:27–38

(foregroundColor: string, backgroundColor = '#FFFFFF')

const COLOR_LEVEL_ALPHA = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1];

const rgba2hex = (foregroundColor: string, backgroundColor = '#FFFFFF') => {
  const getAdjustedChannel = (fValue: number, bValue: number, opacity: number) => opacity * fValue + (1 - opacity) * bValue;
  const fc = Color(foregroundColor);
  const bc = Color(backgroundColor);
  const opacity = fc.alpha();
  const adjustedColor = Color([
    getAdjustedChannel(fc.red(), bc.red(), opacity),
    getAdjustedChannel(fc.green(), bc.green(), opacity),
    getAdjustedChannel(fc.blue(), bc.blue(), opacity),
  ]);
  return adjustedColor.hex();
};

export const getColorValue = (color: string, alpha: number) => {
  return rgba2hex(Color(color).alpha(alpha).string());