Fence.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 Fence extends Transparent{
    protected array $connections = [];
 
    public function getThickness() : float{
        return 0.25;
    }
 
    public function readStateFromWorld() : Block{
        parent::readStateFromWorld();
 
        $this->collisionBoxes = null;
 
        foreach(Facing::HORIZONTAL as $facing){
            $block = $this->getSide($facing);
            if($block instanceof static || $block instanceof FenceGate || $block->getSupportType(Facing::opposite($facing)) === SupportType::FULL){
                $this->connections[$facing] = true;
            }else{
                unset($this->connections[$facing]);
            }
        }
 
        return $this;
    }
 
    protected function recalculateCollisionBoxes() : array{
        $inset = 0.5 - $this->getThickness() / 2;
 
        $bbs = [];
 
        $connectWest = isset($this->connections[Facing::WEST]);
        $connectEast = isset($this->connections[Facing::EAST]);
 
        if($connectWest || $connectEast){
            //X axis (west/east)
            $bbs[] = AxisAlignedBB::one()
                ->squash(Axis::Z, $inset)
                ->extend(Facing::UP, 0.5)
                ->trim(Facing::WEST, $connectWest ? 0 : $inset)
                ->trim(Facing::EAST, $connectEast ? 0 : $inset);
        }
 
        $connectNorth = isset($this->connections[Facing::NORTH]);
        $connectSouth = isset($this->connections[Facing::SOUTH]);
 
        if($connectNorth || $connectSouth){
            //Z axis (north/south)
            $bbs[] = AxisAlignedBB::one()
                ->squash(Axis::X, $inset)
                ->extend(Facing::UP, 0.5)
                ->trim(Facing::NORTH, $connectNorth ? 0 : $inset)
                ->trim(Facing::SOUTH, $connectSouth ? 0 : $inset);
        }
 
        if(count($bbs) === 0){
            //centre post AABB (only needed if not connected on any axis - other BBs overlapping will do this if any connections are made)
            return [
                AxisAlignedBB::one()
                    ->extend(Facing::UP, 0.5)
                    ->contract($inset, 0, $inset)
            ];
        }
 
        return $bbs;
    }
 
    public function getSupportType(int $facing) : SupportType{
        return Facing::axis($facing) === Axis::Y ? SupportType::CENTER : SupportType::NONE;
    }
}