Math.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\math;
 
use function sqrt;
 
final class Math{
    private function __construct(){
        //NOOP
    }
 
    public static function floorFloat($n) : int{
        $i = (int) $n;
        return $n >= $i ? $i : $i - 1;
    }
 
    public static function ceilFloat($n) : int{
        $i = (int) $n;
        return $n <= $i ? $i : $i + 1;
    }
 
    public static function solveQuadratic(float $a, float $b, float $c) : array{
        if($a === 0.0){
            throw new \InvalidArgumentException("Coefficient a cannot be 0!");
        }
        $discriminant = $b * $b - 4 * $a * $c;
        if($discriminant > 0){ //2 real roots
            $sqrtDiscriminant = sqrt($discriminant);
            return [
                (-$b + $sqrtDiscriminant) / (2 * $a),
                (-$b - $sqrtDiscriminant) / (2 * $a)
            ];
        }elseif($discriminant === 0.0){ //1 real root
            return [
                -$b / (2 * $a)
            ];
        }else{ //No real roots
            return [];
        }
    }
}