mirror of
https://github.com/ProjectSWGCore/NGECore2.git
synced 2026-10-11 01:13:05 -04:00
82 lines
2.7 KiB
Java
82 lines
2.7 KiB
Java
/*******************************************************************************
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* Copyright (c) 2013 <Project SWG>
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*
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* This File is part of NGECore2.
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Using NGEngine to work with NGECore2 is making a combined work based on NGEngine.
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* Therefore all terms and conditions of the GNU Lesser General Public License cover the combination.
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******************************************************************************/
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package resources.common;
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import java.math.BigDecimal;
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import engine.resources.scene.*;
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public class MathUtilities {
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public static Quaternion rotateQuaternion(Quaternion quaternion, float radians, Point3D axis) {
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float sin = (float) Math.sin(radians / 2);
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Quaternion rotateQ = new Quaternion((float) Math.cos(radians / 2), axis.x * sin, axis.y * sin, axis.z * sin);
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return multiplyQuaternions(rotateQ, quaternion);
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}
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public static Quaternion multiplyQuaternions(Quaternion q1, Quaternion q2) {
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return new Quaternion(q1.w * q2.w - q1.x * q2.x - q1.y * q2.y - q1.z * q2.z,
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q1.w * q2.x + q1.x * q2.w + q1.y * q2.z - q1.z * q2.y,
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q1.w * q2.y + q1.y * q2.w + q1.z * q2.x - q1.x * q2.z,
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q1.w * q2.z + q1.z * q2.w + q1.x * q2.y - q1.y * q2.x);
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}
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/**
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* Converts seconds to a whole hour.
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* @author Waverunner
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* @param seconds
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* @return hour(s)
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*/
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public static int secondsToWholeHours(int seconds) {
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BigDecimal dec = new BigDecimal(seconds);
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return dec.divide(new BigDecimal(3600), BigDecimal.ROUND_FLOOR).intValue();
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}
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/**
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* Converts seconds to minutes of the hour.
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* @author Waverunner
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* @param seconds
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* @return hour(s)
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*/
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public static int secondsToHourMinutes(int seconds) {
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BigDecimal dec = new BigDecimal(seconds);
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return dec.remainder(new BigDecimal(3600)).divide(new BigDecimal(60), BigDecimal.ROUND_FLOOR).intValue();
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}
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public float fastInverseSqrt(float x) {
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float xHalf = 0.5F * x;
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int temp = Float.floatToRawIntBits(x);
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temp = 0x5F3759DF - (temp >> 1); // magic
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float newX = Float.intBitsToFloat(temp);
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newX = newX * (1.5F - xHalf * newX * newX);
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return newX;
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}
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}
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