Thin.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\SupportType;
use pocketmine\math\Axis;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use function count;
 
class Thin extends Transparent{
    protected array $connections = [];
 
    public function readStateFromWorld() : Block{
        parent::readStateFromWorld();
 
        $this->collisionBoxes = null;
 
        foreach(Facing::HORIZONTAL as $facing){
            $side = $this->getSide($facing);
            if($side instanceof Thin || $side instanceof Wall || $side->getSupportType(Facing::opposite($facing)) === SupportType::FULL){
                $this->connections[$facing] = true;
            }else{
                unset($this->connections[$facing]);
            }
        }
 
        return $this;
    }
 
    protected function recalculateCollisionBoxes() : array{
        $inset = 7 / 16;
 
        $bbs = [];
 
        if(isset($this->connections[Facing::WEST]) || isset($this->connections[Facing::EAST])){
            $bb = AxisAlignedBB::one()->squash(Axis::Z, $inset);
 
            if(!isset($this->connections[Facing::WEST])){
                $bb->trim(Facing::WEST, $inset);
            }elseif(!isset($this->connections[Facing::EAST])){
                $bb->trim(Facing::EAST, $inset);
            }
            $bbs[] = $bb;
        }
 
        if(isset($this->connections[Facing::NORTH]) || isset($this->connections[Facing::SOUTH])){
            $bb = AxisAlignedBB::one()->squash(Axis::X, $inset);
 
            if(!isset($this->connections[Facing::NORTH])){
                $bb->trim(Facing::NORTH, $inset);
            }elseif(!isset($this->connections[Facing::SOUTH])){
                $bb->trim(Facing::SOUTH, $inset);
            }
            $bbs[] = $bb;
        }
 
        if(count($bbs) === 0){
            //centre post AABB (only needed if not connected on any axis - other BBs overlapping will do this if any connections are made)
            return [
                AxisAlignedBB::one()->contract($inset, 0, $inset)
            ];
        }
 
        return $bbs;
    }
 
    public function getSupportType(int $facing) : SupportType{
        return SupportType::NONE;
    }
}