Working with claims (Faction)

How would I make a claim? I am terrible at math and I am trying to figure out how to make a 30 by 3 by 80 claim based on 1 position. I do not know if this is correct.

PHP:

<?php

namespace fac\faction;

use pocketmine\math\Vector3;

class Claim {

    private $faction;

    private $firstPosition;

    private $secondPosition;

    public function __construct(Faction $faction, Vector3 $claimPosition) {
        $this->faction = $faction;
        $x1 = $claimPosition->getX() + 15;
        $y1 = $claimPosition->getY() - 40;
        $z1 = $claimPosition->getZ() - 15;
        $this->firstPosition = new Vector3($x1, $y1, $z1);
        $x2 = $claimPosition->getX() - 14;
        $y2 = $claimPosition->getY() + 40;
        $z2 = $claimPosition->getZ() + 14;
        $this->secondPosition = new Vector3($x2, $y2, $z2);
    }
}


 

The user have to select two positions if you want the claim to be how he like, but if you still want to go like that:

PHP:


<?php

namespace fac\faction;

use pocketmine\math\Vector3;

class Claim {

    private $faction;

    private $firstPosition;

    private $secondPosition;

    public function __construct(Faction $faction, Vector3 $claimPosition) {
        $this->faction = $faction;
        //$y1 = $claimPosition->getY() - 40; Faction claims has the whole Y so no need for that.
        $this->firstPosition = ["x" => ($claimPosition->getX() + 15), "z" => ($claimPosition->getZ() + 15)];
        //$y2 = $claimPosition->getY() + 40;
        $this->secondPosition = ["x" => ($claimPosition->getX() - 14), "z" => ($claimPosition->getZ() - 14)];
    }
}