How to let arrow go straigt

Hi everyone

I am trying to make a plugin and in this plugin you can shoot arrows from a stick. Now I want the stick to shoot the arrow straight, but this does not happen. I tried increasing $baseforce but that doesn't change anything.
This is my code:

PHP:

public function onInteract(PlayerInteractEvent $e){
        $player = $e->getPlayer();
        if($e->getItem()->getId() == ItemIds::STICK){
            $nbt = Entity::CreateBaseNBT(
                $player->add(0, $player->getEyeHeight() + 1, 0),
                $player->getDirectionVector(),
                ($player->yaw > 180 ? 360 : 0) - $player->yaw,
                -$player->pitch
            );
                    $diff = $player->getItemUseDuration();
                    $p = $diff / 20;
                    $baseForce = min((($p ** 2) + $p * 2) / 3, 1);
                    $entity = Entity::createEntity("Arrow", $player->getLevel(), $nbt, $player, true);
                    $ev = new EntityShootBowEvent($player, new Bow, $entity, 50);
                    $ev->call();
      }
   }

I hope someone can help!

 

Remove gravity equation from Arrow class?

Arrow::$gravity = 0.5; (Link)

Extend current Arrow class and modify that value. Just first idea that popped into my mind. Haven't been active nor following along the code changes.

 

Like this?

PHP:

public function onInteract(PlayerInteractEvent $e){
        $player = $e->getPlayer();
        if($e->getItem()->getId() == ItemIds::STICK){
            $nbt = Entity::CreateBaseNBT(
                $player->add(0, $player->getEyeHeight() + 1, 0),
                $player->getDirectionVector(),
                ($player->yaw > 180 ? 360 : 0) - $player->yaw,
                -$player->pitch
            );
                    $entity = Entity::createEntity("Arrow", $player->getLevel(), $nbt, $player, true);
                    $ev = new EntityShootBowEvent($player, new Bow, $entity, 50);
                    $ev->call();
      }
   }

 

How

How would I extend to 2 classes? Because I already extend to PluginBase

 

Create new class.

Take a look at source code and find where the gravity is applied.