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52 lines
1.4 KiB
PHP
52 lines
1.4 KiB
PHP
<?php
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/*
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*
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* ____ _ _ __ __ _ __ __ ____
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* | _ \ ___ ___| | _____| |_| \/ (_)_ __ ___ | \/ | _ \
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* | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
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* | __/ (_) | (__| < __/ |_| | | | | | | | __/_____| | | | __/
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* |_| \___/ \___|_|\_\___|\__|_| |_|_|_| |_|\___| |_| |_|_|
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* @author PocketMine Team
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* @link http://www.pocketmine.net/
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*
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*
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*/
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declare(strict_types=1);
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namespace pocketmine\world\generator;
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use function exp;
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final class Gaussian{
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/** @var int */
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public $smoothSize;
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/** @var float[][] */
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public $kernel = [];
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public function __construct(int $smoothSize){
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$this->smoothSize = $smoothSize;
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$bellSize = 1 / $this->smoothSize;
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$bellHeight = 2 * $this->smoothSize;
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for($sx = -$this->smoothSize; $sx <= $this->smoothSize; ++$sx){
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$this->kernel[$sx + $this->smoothSize] = [];
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for($sz = -$this->smoothSize; $sz <= $this->smoothSize; ++$sz){
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$bx = $bellSize * $sx;
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$bz = $bellSize * $sz;
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$this->kernel[$sx + $this->smoothSize][$sz + $this->smoothSize] = $bellHeight * exp(-($bx * $bx + $bz * $bz) / 2);
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}
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}
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}
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}
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