SubChunkPacketHeightMapInfo.php

<?php
 
/*
 * This file is part of BedrockProtocol.
 * Copyright (C) 2014-2022 PocketMine Team <https://github.com/pmmp/BedrockProtocol>
 *
 * BedrockProtocol 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.
 */
 
declare(strict_types=1);
 
namespace pocketmine\network\mcpe\protocol\types;
 
use pocketmine\network\mcpe\protocol\serializer\PacketSerializer;
use pocketmine\utils\Binary;
use function array_fill;
use function count;
 
class SubChunkPacketHeightMapInfo{
 
    public function __construct(private array $heights){
        if(count($heights) !== 256){
            throw new \InvalidArgumentException("Expected exactly 256 heightmap values");
        }
    }
 
    public function getHeights() : array{ return $this->heights; }
 
    public function getHeight(int $x, int $z) : int{
        return $this->heights[(($z & 0xf) << 4) | ($x & 0xf)];
    }
 
    public static function read(PacketSerializer $in) : self{
        $heights = [];
        for($i = 0; $i < 256; ++$i){
            $heights[] = Binary::signByte($in->getByte());
        }
        return new self($heights);
    }
 
    public function write(PacketSerializer $out) : void{
        for($i = 0; $i < 256; ++$i){
            $out->putByte(Binary::unsignByte($this->heights[$i]));
        }
    }
 
    public static function allTooLow() : self{
        return new self(array_fill(0, 256, -1));
    }
 
    public static function allTooHigh() : self{
        return new self(array_fill(0, 256, 16));
    }
 
    public function isAllTooLow() : bool{
        foreach($this->heights as $height){
            if($height >= 0){
                return false;
            }
        }
        return true;
    }
 
    public function isAllTooHigh() : bool{
        foreach($this->heights as $height){
            if($height <= 15){
                return false;
            }
        }
        return true;
    }
}