PHPAlgorithms / GraphTools

use PHPAlgorithms\GraphTools\Interfaces\PointInterface;

use PHPAlgorithms\GraphTools\Exceptions\PointException;

class Point3D extends Point2D implements PointInterface {

    protected $z;

    protected function checkZ($z)

    {

        if (!is_numeric($z)) {

            throw new PointException("z: {$z} must be numeric value");

        }

    }

    public function __construct($x, $y, $z)

    {

        parent::__construct($x, $y);

        $this->checkZ($z);

        $this->z = $z;

    }

    public function move($x = 0, $y = 0, $z = 0)

    {

        parent::move($x, $y);

        $this->checkZ($z);

        $this->z += $z;

        return $this;

    }

    public function lowerDimension()

    {

        return new Point2D($this->x, $this->y);

    }

}

use PHPAlgorithms\GraphTools\Interfaces\PointInterface;

use PHPAlgorithms\GraphTools\Exceptions\PointException;

class Point4D extends Point3D implements PointInterface {

    protected $t;

    protected function checkT($t)

    {

        if (!is_numeric($t)) {

            throw new PointException("t: {$t} must be numeric value");

        }

    }

    public function __construct($x, $y, $z, $t)

    {

        parent::__construct($x, $y, $z);

        $this->checkT($t);

        $this->t = $t;

    }

    public function move($x = 0, $y = 0, $z = 0, $t = 0)

    {

        parent::move($x, $y, $z);

        $this->checkT($t);

        $this->t += $t;

        return $this;

    }

    public function lowerDimension()

    {

        return new Point3D($this->x, $this->y, $this->z);

    }

}