I have a Color class. It has a property model which is a class that implements ColorModel interface, this property could be a RGB, Hex or HSL classes which implementing ColorModel interface.

// Color.php
class Color {

    protected $model;

    public static function factory (Model $model) {
        return new Color($model);
    }

    public function __construct (Model $model) {
        $this->model = $model;
    }

    public function getModel () {
        return $this->model;
    }

    public function set ($color) {
        $this->model->set($color);
    }

    public function raw ($string = false) {
        return $this->model->raw($string);
    }

    public function check (Color $color) {
        return get_class($this->model) === get_class($color->getModel());
    }

    public function isModel ($type) {
        return $type === $this->model->getName();
    }

    // Converter probably suppose to be a strategy which converts color model to another color model
    public function convert (Converter $convert) {
        // I'm stack here...
    }

}

// ColorModel.php
interface ColorModel {

    // Parser is a class which parses input string/int and converts it to components
    public function __construct (Parser $parser, $x, $y, $z);

    public function raw ($string = false);

    public function set ($color);

    public function getName ();

}

I’m not sure how to implement the conversion of ColorModels. How can I implement conversion of those different models without having to create every class for each set (RGB2HSL, HSL2RGB. Let’s say I add LAB class four another classes: LAB2RGB, LAB2HSL, HSL2LAB, RGB2LAB, and more, and more)? It’s possible at all?

Thank you for attention!