populator/Tree.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\world\generator\populator;
 
use pocketmine\block\BlockTypeIds;
use pocketmine\block\BlockTypeTags;
use pocketmine\utils\Random;
use pocketmine\world\ChunkManager;
use pocketmine\world\format\Chunk;
use pocketmine\world\generator\object\TreeFactory;
use pocketmine\world\generator\object\TreeType;
 
class Tree implements Populator{
    private int $randomAmount = 1;
    private int $baseAmount = 0;
    private TreeType $type;
 
    public function __construct(?TreeType $type = null){
        $this->type = $type ?? TreeType::OAK;
    }
 
    public function setRandomAmount(int $amount) : void{
        $this->randomAmount = $amount;
    }
 
    public function setBaseAmount(int $amount) : void{
        $this->baseAmount = $amount;
    }
 
    public function populate(ChunkManager $world, int $chunkX, int $chunkZ, Random $random) : void{
        $amount = $random->nextRange(0, $this->randomAmount) + $this->baseAmount;
        for($i = 0; $i < $amount; ++$i){
            $x = $random->nextRange($chunkX << Chunk::COORD_BIT_SIZE, ($chunkX << Chunk::COORD_BIT_SIZE) + Chunk::EDGE_LENGTH);
            $z = $random->nextRange($chunkZ << Chunk::COORD_BIT_SIZE, ($chunkZ << Chunk::COORD_BIT_SIZE) + Chunk::EDGE_LENGTH);
            $y = $this->getHighestWorkableBlock($world, $x, $z);
            if($y === -1){
                continue;
            }
            $tree = TreeFactory::get($random, $this->type);
            $transaction = $tree?->getBlockTransaction($world, $x, $y, $z, $random);
            $transaction?->apply();
        }
    }
 
    private function getHighestWorkableBlock(ChunkManager $world, int $x, int $z) : int{
        $highestBlock = $world->getChunk($x >> Chunk::COORD_BIT_SIZE, $z >> Chunk::COORD_BIT_SIZE)?->getHighestBlockAt($x & Chunk::COORD_MASK, $z & Chunk::COORD_MASK);
        if($highestBlock === null){
            return -1;
        }
        for($y = $highestBlock; $y >= 0; --$y){
            $b = $world->getBlockAt($x, $y, $z);
            if($b->hasTypeTag(BlockTypeTags::DIRT) || $b->hasTypeTag(BlockTypeTags::MUD)){
                return $y + 1;
            }elseif($b->getTypeId() !== BlockTypeIds::AIR && $b->getTypeId() !== BlockTypeIds::SNOW_LAYER){
                return -1;
            }
        }
 
        return -1;
    }
}