Wall.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\block\utils\WallConnectionType;
use pocketmine\data\runtime\RuntimeDataDescriber;
use pocketmine\math\Axis;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
 
class Wall extends Transparent{
 
    protected array $connections = [];
    protected bool $post = false;
 
    protected function describeBlockOnlyState(RuntimeDataDescriber $w) : void{
        $w->wallConnections($this->connections);
        $w->bool($this->post);
    }
 
    public function getConnections() : array{ return $this->connections; }
 
    public function getConnection(int $face) : ?WallConnectionType{
        return $this->connections[$face] ?? null;
    }
 
    public function setConnections(array $connections) : self{
        $this->connections = $connections;
        return $this;
    }
 
    public function setConnection(int $face, ?WallConnectionType $type) : self{
        if($face !== Facing::NORTH && $face !== Facing::SOUTH && $face !== Facing::WEST && $face !== Facing::EAST){
            throw new \InvalidArgumentException("Facing can only be north, east, south or west");
        }
        if($type !== null){
            $this->connections[$face] = $type;
        }else{
            unset($this->connections[$face]);
        }
        return $this;
    }
 
    public function isPost() : bool{ return $this->post; }
 
    public function setPost(bool $post) : self{
        $this->post = $post;
        return $this;
    }
 
    public function onNearbyBlockChange() : void{
        if($this->recalculateConnections()){
            $this->position->getWorld()->setBlock($this->position, $this);
        }
    }
 
    protected function recalculateConnections() : bool{
        $changed = 0;
 
        //TODO: implement tall/short connections - right now we only support short as per pre-1.16
 
        foreach(Facing::HORIZONTAL as $facing){
            $block = $this->getSide($facing);
            if($block instanceof static || $block instanceof FenceGate || $block instanceof Thin || $block->getSupportType(Facing::opposite($facing)) === SupportType::FULL){
                if(!isset($this->connections[$facing])){
                    $this->connections[$facing] = WallConnectionType::SHORT;
                    $changed++;
                }
            }elseif(isset($this->connections[$facing])){
                unset($this->connections[$facing]);
                $changed++;
            }
        }
 
        $up = $this->getSide(Facing::UP)->getTypeId() !== BlockTypeIds::AIR;
        if($up !== $this->post){
            $this->post = $up;
            $changed++;
        }
 
        return $changed > 0;
    }
 
    protected function recalculateCollisionBoxes() : array{
        //walls don't have any special collision boxes like fences do
 
        $north = isset($this->connections[Facing::NORTH]);
        $south = isset($this->connections[Facing::SOUTH]);
        $west = isset($this->connections[Facing::WEST]);
        $east = isset($this->connections[Facing::EAST]);
 
        $inset = 0.25;
        if(
            !$this->post && //if there is a block on top, it stays as a post
            (
                ($north && $south && !$west && !$east) ||
                (!$north && !$south && $west && $east)
            )
        ){
            //If connected to two sides on the same axis but not any others, AND there is not a block on top, there is no post and the wall is thinner
            $inset = 0.3125;
        }
 
        return [
            AxisAlignedBB::one()
                ->extend(Facing::UP, 0.5)
                ->trim(Facing::NORTH, $north ? 0 : $inset)
                ->trim(Facing::SOUTH, $south ? 0 : $inset)
                ->trim(Facing::WEST, $west ? 0 : $inset)
                ->trim(Facing::EAST, $east ? 0 : $inset)
        ];
    }
 
    public function getSupportType(int $facing) : SupportType{
        return Facing::axis($facing) === Axis::Y ? SupportType::CENTER : SupportType::NONE;
    }
}