entity/projectile/Arrow.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\projectile;
 
use pocketmine\block\Block;
use pocketmine\entity\animation\ArrowShakeAnimation;
use pocketmine\entity\Entity;
use pocketmine\entity\EntitySizeInfo;
use pocketmine\entity\Location;
use pocketmine\event\entity\EntityItemPickupEvent;
use pocketmine\event\entity\ProjectileHitEvent;
use pocketmine\item\VanillaItems;
use pocketmine\math\RayTraceResult;
use pocketmine\nbt\tag\CompoundTag;
use pocketmine\network\mcpe\EntityEventBroadcaster;
use pocketmine\network\mcpe\NetworkBroadcastUtils;
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\player\Player;
use pocketmine\world\sound\ArrowHitSound;
use function ceil;
use function mt_rand;
use function sqrt;
 
class Arrow extends Projectile{
 
    public function getNetworkTypeId() : string{ return EntityIds::ARROW; }
 
    public const PICKUP_NONE = 0;
    public const PICKUP_ANY = 1;
    public const PICKUP_CREATIVE = 2;
 
    private const TAG_PICKUP = "pickup"; //TAG_Byte
    public const TAG_CRIT = "crit"; //TAG_Byte
    private const TAG_LIFE = "life"; //TAG_Short
 
    protected float $damage = 2.0;
    protected int $pickupMode = self::PICKUP_ANY;
    protected float $punchKnockback = 0.0;
    protected int $collideTicks = 0;
    protected bool $critical = false;
 
    public function __construct(Location $location, ?Entity $shootingEntity, bool $critical, ?CompoundTag $nbt = null){
        parent::__construct($location, $shootingEntity, $nbt);
        $this->setCritical($critical);
    }
 
    protected function getInitialSizeInfo() : EntitySizeInfo{ return new EntitySizeInfo(0.25, 0.25); }
 
    protected function getInitialDragMultiplier() : float{ return 0.01; }
 
    protected function getInitialGravity() : float{ return 0.05; }
 
    protected function initEntity(CompoundTag $nbt) : void{
        parent::initEntity($nbt);
 
        $this->pickupMode = $nbt->getByte(self::TAG_PICKUP, self::PICKUP_ANY);
        $this->critical = $nbt->getByte(self::TAG_CRIT, 0) === 1;
        $this->collideTicks = $nbt->getShort(self::TAG_LIFE, $this->collideTicks);
    }
 
    public function saveNBT() : CompoundTag{
        $nbt = parent::saveNBT();
        $nbt->setByte(self::TAG_PICKUP, $this->pickupMode);
        $nbt->setByte(self::TAG_CRIT, $this->critical ? 1 : 0);
        $nbt->setShort(self::TAG_LIFE, $this->collideTicks);
        return $nbt;
    }
 
    public function isCritical() : bool{
        return $this->critical;
    }
 
    public function setCritical(bool $value = true) : void{
        $this->critical = $value;
        $this->networkPropertiesDirty = true;
    }
 
    public function getResultDamage() : int{
        $base = (int) ceil($this->motion->length() * parent::getResultDamage());
        if($this->isCritical()){
            return ($base + mt_rand(0, (int) ($base / 2) + 1));
        }else{
            return $base;
        }
    }
 
    public function getPunchKnockback() : float{
        return $this->punchKnockback;
    }
 
    public function setPunchKnockback(float $punchKnockback) : void{
        $this->punchKnockback = $punchKnockback;
    }
 
    protected function entityBaseTick(int $tickDiff = 1) : bool{
        if($this->closed){
            return false;
        }
 
        $hasUpdate = parent::entityBaseTick($tickDiff);
 
        if($this->blockHit !== null){
            $this->collideTicks += $tickDiff;
            if($this->collideTicks > 1200){
                $this->flagForDespawn();
                $hasUpdate = true;
            }
        }else{
            $this->collideTicks = 0;
        }
 
        return $hasUpdate;
    }
 
    protected function onHit(ProjectileHitEvent $event) : void{
        $this->setCritical(false);
        $this->broadcastSound(new ArrowHitSound());
    }
 
    protected function onHitBlock(Block $blockHit, RayTraceResult $hitResult) : void{
        parent::onHitBlock($blockHit, $hitResult);
        $this->broadcastAnimation(new ArrowShakeAnimation($this, 7));
    }
 
    protected function onHitEntity(Entity $entityHit, RayTraceResult $hitResult) : void{
        parent::onHitEntity($entityHit, $hitResult);
        if($this->punchKnockback > 0){
            $horizontalSpeed = sqrt($this->motion->x ** 2 + $this->motion->z ** 2);
            if($horizontalSpeed > 0){
                $multiplier = $this->punchKnockback * 0.6 / $horizontalSpeed;
                $entityHit->setMotion($entityHit->getMotion()->add($this->motion->x * $multiplier, 0.1, $this->motion->z * $multiplier));
            }
        }
    }
 
    public function getPickupMode() : int{
        return $this->pickupMode;
    }
 
    public function setPickupMode(int $pickupMode) : void{
        $this->pickupMode = $pickupMode;
    }
 
    public function onCollideWithPlayer(Player $player) : void{
        if($this->blockHit === null){
            return;
        }
 
        $item = VanillaItems::ARROW();
        $playerInventory = match(true){
            !$player->hasFiniteResources() => null, //arrows are not picked up in creative
            $player->getOffHandInventory()->getItem(0)->canStackWith($item) && $player->getOffHandInventory()->canAddItem($item) => $player->getOffHandInventory(),
            $player->getInventory()->canAddItem($item) => $player->getInventory(),
            default => null
        };
 
        $ev = new EntityItemPickupEvent($player, $this, $item, $playerInventory);
        if($player->hasFiniteResources() && $playerInventory === null){
            $ev->cancel();
        }
        if($this->pickupMode === self::PICKUP_NONE || ($this->pickupMode === self::PICKUP_CREATIVE && !$player->isCreative())){
            $ev->cancel();
        }
 
        $ev->call();
        if($ev->isCancelled()){
            return;
        }
 
        NetworkBroadcastUtils::broadcastEntityEvent(
            $this->getViewers(),
            fn(EntityEventBroadcaster $broadcaster, array $recipients) => $broadcaster->onPickUpItem($recipients, $player, $this)
        );
 
        $ev->getInventory()?->addItem($ev->getItem());
        $this->flagForDespawn();
    }
 
    protected function syncNetworkData(EntityMetadataCollection $properties) : void{
        parent::syncNetworkData($properties);
 
        $properties->setGenericFlag(EntityMetadataFlags::CRITICAL, $this->critical);
    }
}