Slab.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\SlabType;
use pocketmine\block\utils\SupportType;
use pocketmine\data\runtime\RuntimeDataDescriber;
use pocketmine\item\Item;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\player\Player;
use pocketmine\world\BlockTransaction;
 
class Slab extends Transparent{
    protected SlabType $slabType = SlabType::BOTTOM;
 
    public function __construct(BlockIdentifier $idInfo, string $name, BlockTypeInfo $typeInfo){
        parent::__construct($idInfo, $name . " Slab", $typeInfo);
    }
 
    protected function describeBlockOnlyState(RuntimeDataDescriber $w) : void{
        $w->enum($this->slabType);
    }
 
    public function isTransparent() : bool{
        return $this->slabType !== SlabType::DOUBLE;
    }
 
    public function getSlabType() : SlabType{
        return $this->slabType;
    }
 
    public function setSlabType(SlabType $slabType) : self{
        $this->slabType = $slabType;
        return $this;
    }
 
    public function canBePlacedAt(Block $blockReplace, Vector3 $clickVector, int $face, bool $isClickedBlock) : bool{
        if(parent::canBePlacedAt($blockReplace, $clickVector, $face, $isClickedBlock)){
            return true;
        }
 
        if($blockReplace instanceof Slab && $blockReplace->slabType !== SlabType::DOUBLE && $blockReplace->hasSameTypeId($this)){
            if($blockReplace->slabType === SlabType::TOP){ //Trying to combine with top slab
                return $clickVector->y <= 0.5 || (!$isClickedBlock && $face === Facing::UP);
            }else{
                return $clickVector->y >= 0.5 || (!$isClickedBlock && $face === Facing::DOWN);
            }
        }
 
        return false;
    }
 
    public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
        if($blockReplace instanceof Slab && $blockReplace->slabType !== SlabType::DOUBLE && $blockReplace->hasSameTypeId($this) && (
            ($blockReplace->slabType === SlabType::TOP && ($clickVector->y <= 0.5 || $face === Facing::UP)) ||
            ($blockReplace->slabType === SlabType::BOTTOM && ($clickVector->y >= 0.5 || $face === Facing::DOWN))
        )){
            //Clicked in empty half of existing slab
            $this->slabType = SlabType::DOUBLE;
        }else{
            $this->slabType = (($face !== Facing::UP && $clickVector->y > 0.5) || $face === Facing::DOWN) ? SlabType::TOP : SlabType::BOTTOM;
        }
 
        return parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
    }
 
    protected function recalculateCollisionBoxes() : array{
        if($this->slabType === SlabType::DOUBLE){
            return [AxisAlignedBB::one()];
        }
        return [AxisAlignedBB::one()->trim($this->slabType === SlabType::TOP ? Facing::DOWN : Facing::UP, 0.5)];
    }
 
    public function getSupportType(int $facing) : SupportType{
        if($this->slabType === SlabType::DOUBLE){
            return SupportType::FULL;
        }elseif(($facing === Facing::UP && $this->slabType === SlabType::TOP) || ($facing === Facing::DOWN && $this->slabType === SlabType::BOTTOM)){
            return SupportType::FULL;
        }
        return SupportType::NONE;
    }
 
    public function getDropsForCompatibleTool(Item $item) : array{
        return [$this->asItem()->setCount($this->slabType === SlabType::DOUBLE ? 2 : 1)];
    }
}