PrimedTNT.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\entity\object;
 
use pocketmine\block\VanillaBlocks;
use pocketmine\entity\Entity;
use pocketmine\entity\EntitySizeInfo;
use pocketmine\entity\Explosive;
use pocketmine\event\entity\EntityDamageEvent;
use pocketmine\event\entity\EntityPreExplodeEvent;
use pocketmine\item\Item;
use pocketmine\math\Vector3;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\network\mcpe\protocol\types\entity\EntityIds;
use pocketmine\network\mcpe\protocol\types\entity\EntityMetadataCollection;
use pocketmine\network\mcpe\protocol\types\entity\EntityMetadataFlags;
use pocketmine\network\mcpe\protocol\types\entity\EntityMetadataProperties;
use pocketmine\world\Explosion;
use pocketmine\world\Position;
 
class PrimedTNT extends Entity implements Explosive{
 
    private const TAG_FUSE = "Fuse"; //TAG_Short
 
    public static function getNetworkTypeId() : string{ return EntityIds::TNT; }
 
    protected int $fuse;
    protected bool $worksUnderwater = false;
 
    protected function getInitialSizeInfo() : EntitySizeInfo{ return new EntitySizeInfo(0.98, 0.98); }
 
    protected function getInitialDragMultiplier() : float{ return 0.02; }
 
    protected function getInitialGravity() : float{ return 0.04; }
 
    public function getFuse() : int{
        return $this->fuse;
    }
 
    public function setFuse(int $fuse) : void{
        if($fuse < 0 || $fuse > 32767){
            throw new \InvalidArgumentException("Fuse must be in the range 0-32767");
        }
        $this->fuse = $fuse;
        $this->networkPropertiesDirty = true;
    }
 
    public function worksUnderwater() : bool{ return $this->worksUnderwater; }
 
    public function setWorksUnderwater(bool $worksUnderwater) : void{
        $this->worksUnderwater = $worksUnderwater;
        $this->networkPropertiesDirty = true;
    }
 
    public function attack(EntityDamageEvent $source) : void{
        if($source->getCause() === EntityDamageEvent::CAUSE_VOID){
            parent::attack($source);
        }
    }
 
    protected function initEntity(CompoundTag $nbt) : void{
        parent::initEntity($nbt);
 
        $this->fuse = $nbt->getShort(self::TAG_FUSE, 80);
    }
 
    public function canCollideWith(Entity $entity) : bool{
        return false;
    }
 
    public function saveNBT() : CompoundTag{
        $nbt = parent::saveNBT();
        $nbt->setShort(self::TAG_FUSE, $this->fuse);
 
        return $nbt;
    }
 
    protected function entityBaseTick(int $tickDiff = 1) : bool{
        if($this->closed){
            return false;
        }
 
        $hasUpdate = parent::entityBaseTick($tickDiff);
 
        if(!$this->isFlaggedForDespawn()){
            $this->fuse -= $tickDiff;
            $this->networkPropertiesDirty = true;
 
            if($this->fuse <= 0){
                $this->flagForDespawn();
                $this->explode();
            }
        }
 
        return $hasUpdate || $this->fuse >= 0;
    }
 
    public function explode() : void{
        $ev = new EntityPreExplodeEvent($this, 4);
        $ev->call();
        if(!$ev->isCancelled()){
            //TODO: deal with underwater TNT (underwater TNT treats water as if it has a blast resistance of 0)
            $explosion = new Explosion(Position::fromObject($this->location->add(0, $this->size->getHeight() / 2, 0), $this->getWorld()), $ev->getRadius(), $this, $ev->getFireChance());
            if($ev->isBlockBreaking()){
                $explosion->explodeA();
            }
            $explosion->explodeB();
        }
    }
 
    public function getPickedItem() : ?Item{
        return VanillaBlocks::TNT()->setWorksUnderwater($this->worksUnderwater)->asItem();
    }
 
    protected function syncNetworkData(EntityMetadataCollection $properties) : void{
        parent::syncNetworkData($properties);
 
        $properties->setGenericFlag(EntityMetadataFlags::IGNITED, true);
        $properties->setInt(EntityMetadataProperties::VARIANT, $this->worksUnderwater ? 1 : 0);
        $properties->setInt(EntityMetadataProperties::FUSE_LENGTH, $this->fuse);
    }
 
    public function getOffsetPosition(Vector3 $vector3) : Vector3{
        return $vector3->add(0, 0.49, 0);
    }
}