/**
* Class constructor
*
* @param int The alpha value defining opacity (0-255)
* @param int The red color value (0-255)
* @param int The green color value (0-255)
* @param int The blue color value (0-255)
* @return void
*/
public function __construct($alpha = 0, $red = 0, $green = 0, $blue = 0)
{
// Calls the parent constructor
parent::_construct();
// Stores the alpha values
$this->_alpha = self::$_number->inRange($alpha, 0, 255);
}
