Stair.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\HorizontalFacing;
use pocketmine\block\utils\HorizontalFacingTrait;
use pocketmine\block\utils\StairShape;
use pocketmine\block\utils\SupportType;
use pocketmine\data\runtime\RuntimeDataDescriber;
use pocketmine\item\Item;
use pocketmine\math\Axis;
use pocketmine\math\AxisAlignedBB;
use pocketmine\math\Facing;
use pocketmine\math\Vector3;
use pocketmine\player\Player;
use pocketmine\world\BlockTransaction;
 
class Stair extends Transparent implements HorizontalFacing{
    use HorizontalFacingTrait;
 
    protected bool $upsideDown = false;
    protected StairShape $shape = StairShape::STRAIGHT;
 
    protected function describeBlockOnlyState(RuntimeDataDescriber $w) : void{
        $w->horizontalFacing($this->facing);
        $w->bool($this->upsideDown);
    }
 
    public function readStateFromWorld() : Block{
        parent::readStateFromWorld();
 
        $this->collisionBoxes = null;
 
        $clockwise = Facing::rotateY($this->facing, true);
        if(($backFacing = $this->getPossibleCornerFacing(false)) !== null){
            $this->shape = $backFacing === $clockwise ? StairShape::OUTER_RIGHT : StairShape::OUTER_LEFT;
        }elseif(($frontFacing = $this->getPossibleCornerFacing(true)) !== null){
            $this->shape = $frontFacing === $clockwise ? StairShape::INNER_RIGHT : StairShape::INNER_LEFT;
        }else{
            $this->shape = StairShape::STRAIGHT;
        }
 
        return $this;
    }
 
    public function isUpsideDown() : bool{ return $this->upsideDown; }
 
    public function setUpsideDown(bool $upsideDown) : self{
        $this->upsideDown = $upsideDown;
        return $this;
    }
 
    public function getShape() : StairShape{ return $this->shape; }
 
    public function setShape(StairShape $shape) : self{
        $this->shape = $shape;
        return $this;
    }
 
    protected function recalculateCollisionBoxes() : array{
        $topStepFace = $this->upsideDown ? Facing::DOWN : Facing::UP;
        $bbs = [
            AxisAlignedBB::one()->trim($topStepFace, 0.5)
        ];
 
        $topStep = AxisAlignedBB::one()
            ->trim(Facing::opposite($topStepFace), 0.5)
            ->trim(Facing::opposite($this->facing), 0.5);
 
        if($this->shape === StairShape::OUTER_LEFT || $this->shape === StairShape::OUTER_RIGHT){
            $topStep->trim(Facing::rotateY($this->facing, $this->shape === StairShape::OUTER_LEFT), 0.5);
        }elseif($this->shape === StairShape::INNER_LEFT || $this->shape === StairShape::INNER_RIGHT){
            //add an extra cube
            $bbs[] = AxisAlignedBB::one()
                ->trim(Facing::opposite($topStepFace), 0.5)
                ->trim($this->facing, 0.5) //avoid overlapping with main step
                ->trim(Facing::rotateY($this->facing, $this->shape === StairShape::INNER_LEFT), 0.5);
        }
 
        $bbs[] = $topStep;
 
        return $bbs;
    }
 
    public function getSupportType(int $facing) : SupportType{
        if(
            $facing === Facing::UP && $this->upsideDown ||
            $facing === Facing::DOWN && !$this->upsideDown ||
            ($facing === $this->facing && $this->shape !== StairShape::OUTER_LEFT && $this->shape !== StairShape::OUTER_RIGHT) ||
            ($facing === Facing::rotate($this->facing, Axis::Y, false) && $this->shape === StairShape::INNER_LEFT) ||
            ($facing === Facing::rotate($this->facing, Axis::Y, true) && $this->shape === StairShape::INNER_RIGHT)
        ){
            return SupportType::FULL;
        }
        return SupportType::NONE;
    }
 
    private function getPossibleCornerFacing(bool $oppositeFacing) : ?int{
        $side = $this->getSide($oppositeFacing ? Facing::opposite($this->facing) : $this->facing);
        return (
            $side instanceof Stair &&
            $side->upsideDown === $this->upsideDown &&
            Facing::axis($side->facing) !== Facing::axis($this->facing) //perpendicular
        ) ? $side->facing : null;
    }
 
    public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
        if($player !== null){
            $this->facing = $player->getHorizontalFacing();
        }
        $this->upsideDown = (($clickVector->y > 0.5 && $face !== Facing::UP) || $face === Facing::DOWN);
 
        return parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
    }
}