EntityDamageByEntityEvent.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\event\entity;
 
use pocketmine\entity\effect\VanillaEffects;
use pocketmine\entity\Entity;
use pocketmine\entity\Living;
 
class EntityDamageByEntityEvent extends EntityDamageEvent{
    private int $damagerEntityId;
 
    public function __construct(
        Entity $damager,
        Entity $entity,
        int $cause,
        float $damage,
        array $modifiers = [],
        private float $knockBack = Living::DEFAULT_KNOCKBACK_FORCE,
        private float $verticalKnockBackLimit = Living::DEFAULT_KNOCKBACK_VERTICAL_LIMIT
    ){
        $this->damagerEntityId = $damager->getId();
        parent::__construct($entity, $cause, $damage, $modifiers);
        $this->addAttackerModifiers($damager);
    }
 
    protected function addAttackerModifiers(Entity $damager) : void{
        if($damager instanceof Living){ //TODO: move this to entity classes
            $effects = $damager->getEffects();
            if(($strength = $effects->get(VanillaEffects::STRENGTH())) !== null){
                $this->setModifier($this->getBaseDamage() * 0.3 * $strength->getEffectLevel(), self::MODIFIER_STRENGTH);
            }
 
            if(($weakness = $effects->get(VanillaEffects::WEAKNESS())) !== null && $this->getCause() === EntityDamageEvent::CAUSE_ENTITY_ATTACK){
                $this->setModifier(-($this->getBaseDamage() * 0.2 * $weakness->getEffectLevel()), self::MODIFIER_WEAKNESS);
            }
        }
    }
 
    public function getDamager() : ?Entity{
        return $this->getEntity()->getWorld()->getServer()->getWorldManager()->findEntity($this->damagerEntityId);
    }
 
    public function getKnockBack() : float{
        return $this->knockBack;
    }
 
    public function setKnockBack(float $knockBack) : void{
        $this->knockBack = $knockBack;
    }
 
    public function getVerticalKnockBackLimit() : float{
        return $this->verticalKnockBackLimit;
    }
 
    public function setVerticalKnockBackLimit(float $verticalKnockBackLimit) : void{
        $this->verticalKnockBackLimit = $verticalKnockBackLimit;
    }
}