PressurePlate.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\block;
 
use pocketmine\block\utils\StaticSupportTrait;
use pocketmine\block\utils\SupportType;
use pocketmine\entity\Entity;
use pocketmine\event\block\PressurePlateUpdateEvent;
use pocketmine\math\Axis;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\world\sound\PressurePlateActivateSound;
use pocketmine\world\sound\PressurePlateDeactivateSound;
use function count;
 
abstract class PressurePlate extends Transparent{
    use StaticSupportTrait;
 
    private readonly int $deactivationDelayTicks;
 
    public function __construct(
        BlockIdentifier $idInfo,
        string $name,
        BlockTypeInfo $typeInfo,
        int $deactivationDelayTicks
    ){
        parent::__construct($idInfo, $name, $typeInfo);
        $this->deactivationDelayTicks = $deactivationDelayTicks;
    }
 
    public function isSolid() : bool{
        return false;
    }
 
    protected function recalculateCollisionBoxes() : array{
        return [];
    }
 
    public function getSupportType(Facing $facing) : SupportType{
        return SupportType::NONE;
    }
 
    private function canBeSupportedAt(Block $block) : bool{
        return $block->getAdjacentSupportType(Facing::DOWN) !== SupportType::NONE;
    }
 
    public function hasEntityCollision() : bool{
        return true;
    }
 
    public function onEntityInside(Entity $entity) : bool{
        if(!$this->hasOutputSignal()){
            $this->position->getWorld()->scheduleDelayedBlockUpdate($this->position, 0);
        }
        return true;
    }
 
    protected function getActivationBox() : AxisAlignedBB{
        return AxisAlignedBB::one()
            ->squashedCopy(Axis::X, 1 / 8)
            ->squashedCopy(Axis::Z, 1 / 8)
            ->trimmedCopy(Facing::UP, 3 / 4)
            ->offsetCopy($this->position->x, $this->position->y, $this->position->z);
    }
 
    abstract protected function hasOutputSignal() : bool;
 
    abstract protected function calculatePlateState(array $entities) : array;
 
    protected function filterIrrelevantEntities(array $entities) : array{
        return $entities;
    }
 
    public function onScheduledUpdate() : void{
        $world = $this->position->getWorld();
 
        $intersectionAABB = $this->getActivationBox();
        $activatingEntities = $this->filterIrrelevantEntities($world->getNearbyEntities($intersectionAABB));
 
        //if an irrelevant entity is inside the full cube space of the pressure plate but not activating the plate,
        //it will cause scheduled updates on the plate every tick. We don't want to fire events in this case if the
        //plate is already deactivated.
        if(count($activatingEntities) > 0 || $this->hasOutputSignal()){
            [$newState, $pressedChange] = $this->calculatePlateState($activatingEntities);
 
            //always call this, in case there are new entities on the plate
            if(PressurePlateUpdateEvent::hasHandlers()){
                $ev = new PressurePlateUpdateEvent($this, $newState, $activatingEntities);
                $ev->call();
                $newState = $ev->isCancelled() ? null : $ev->getNewState();
            }
            if($newState !== null){
                $world->setBlock($this->position, $newState);
                if($pressedChange !== null){
                    $world->addSound($this->position, $pressedChange ?
                        new PressurePlateActivateSound($this) :
                        new PressurePlateDeactivateSound($this)
                    );
                }
            }
            if($pressedChange ?? $this->hasOutputSignal()){
                $world->scheduleDelayedBlockUpdate($this->position, $this->deactivationDelayTicks);
            }
        }
    }
}