public function changeHSL($dh=0, $ds=0, $dl=0)
    {
        list($h, $s, $l) = $this->toHSL();

        $h += $dh;
        $s += $ds;
        $l += $dl;

        $c = self::fromHSL($h, $s, $l);

        $this->r = $c->r;
        $this->g = $c->g;
        $this->b = $c->b;

        return $this;
    }
public function changeHSL($dh=0, $ds=0, $dl=0)
    {
        list($h, $s, $l) = $this->toHSL();

        $h += $dh;
        $s += $ds;
        $l += $dl;

        $c = self::fromHSL($h, $s, $l);

        $this->r = $c->r;
        $this->g = $c->g;
        $this->b = $c->b;

        return $this;
    }
public function changeHSL ( $ dh = 0 , $ ds = 0 , $ dl = 0 ) { list ( $ h , $ s , $ l ) = $ this -> toHSL ( ) ; $ h += $ dh ; $ s += $ ds ; $ l += $ dl ; $ c = self :: fromHSL ( $ h , $ s , $ l ) ; $ this -> r = $ c -> r ; $ this -> g = $ c -> g ; $ this -> b = $ c -> b ; return $ this ; }
Change HSL values by given deltas

@param float $dh Change in Hue
@param float $ds Change in Saturation
@param float $dl Change in Lightness

@returns Color The color object with the required changes
Change HSL values by given deltas