public function __construct($r, $g, $b, $a = 1)
{
$this->r = roundInt(clamp($r, 0, 255));
$this->g = roundInt(clamp($g, 0, 255));
$this->b = roundInt(clamp($b, 0, 255));
$this->setAlpha($a);
}
/**
* Sets the alpha channel of the color
* Use a normalized value between 0 and 1,
* where 1 is 100% opaque and 0 is transparent
* @param int|float $alpha
*/
protected function setAlpha($alpha)
{
$this->a = clamp($alpha, 0, 1);
}
public function test_clamp_upper_bound()
{
$clamped = clamp(20, 0, 10);
$this->assertSame($clamped, 10);
}
/**
* Clamps the hue between 0 and 360
* Also forces a hue of 360 to wrap back to 0 since HSV mapping is cylindrical, and 360 is the same as 0;
* @param $h
* @return float|int
*/
private function clampHue($h)
{
$h = clamp($h, 0, 360);
return $h === 360 ? 0 : $h;
}
