/**
* Return $color with 50% transparency
*
* @param ColorNode $color
* @param DimensionNode $percentage
* @return string
*/
public function fade(ColorNode $color, DimensionNode $percentage = null)
{
$hsl = $color->toHSL();
if ($percentage && $percentage->unit->is('%')) {
$hsl['a'] = $percentage->value / 100;
} else {
$hsl['a'] = $percentage ? $percentage->value : 50;
}
$hsl['a'] = $this->clamp($hsl['a']);
return $this->hsla($hsl['h'], $hsl['s'], $hsl['l'], $hsl['a']);
}
