126 lines
3.1 KiB
Java
126 lines
3.1 KiB
Java
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/*
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File: MoreMath.java
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University of Applied Science Berne,HTA-Biel/Bienne,
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Computer Science Department.
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Diploma thesis J3D Solar System Simulator
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Originally written by Marcel Portner & Bernhard Hari (c) 2000
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CVS - Information :
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$Header: /var/cvsreps/projects/c450/2000/sss3d/source_diploma/sss3d/calculations/MoreMath.java,v 1.2 2000/12/12 11:16:34 portm Exp $
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$Author: portm $
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$Date: 2000/12/12 11:16:34 $
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$State: Exp $
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*/
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package sss3d.calculations;
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/**
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* This class contains mathematical function who are not supportet by JDK.<br>
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* For example sinus hyperbola:
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* <pre>
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* use : MoreMath.sinh(x);
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* </pre>
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*
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* @author Marcel Portner & Bernhard Hari
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* @version $Revision: 1.2 $
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*/
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public final class MoreMath {
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/**
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* The constant value of 2 * PI.
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*/
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public static final double PI2 = 2.0 * StrictMath.PI;
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/**
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* The constant value for calculation to radian.
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*/
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public static final double RAD = StrictMath.PI / 180.0;
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/**
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* The constant value for calculation to degree.
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*/
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public static final double DEG = 180.0 / StrictMath.PI;
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/**
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* The constant value for calculation to arcs.
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*/
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public static final double ARCS = 3600.0 * 180.0 / StrictMath.PI;
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/**
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* Give from a double value the decimal place.
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*
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* @param x the double value where we want the decimal place.
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*
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* @return the decimal place of the double value.
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*/
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public static double frac(double x) {
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return x - StrictMath.floor(x);
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}
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/**
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* Calculate x mod y.
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*
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* @param x a double value.
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* @param y a double value.
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*
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* @return the modulo part of x modulo y.
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*/
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public static double modulo(double x, double y) {
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return y * frac(x / y);
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}
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/**
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* Calculate the sinus hyperbola.
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*
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* @param x an angle, in radians.
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*
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* @return the sinh of x [sinh(x) = (e^x - e^-x) / 2].
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*/
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public static double sinh(double x) {
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return (StrictMath.exp(x) - StrictMath.exp(-x)) / 2.0;
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}
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/**
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* Calculate the cosinus hyperbola.
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*
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* @param x an angle, in radians.
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*
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* @return the cosh of x [cosh(x) = (e^x + e^-x) / 2].
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*/
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public static double cosh(double x) {
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return (StrictMath.exp(x) + StrictMath.exp(-x)) / 2.0;
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}
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/**
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* Calculate the log of basis 10.
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*
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* @param x a number greater than 0.0.
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*
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* @return the log of basis 10.
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*/
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public static double log10(double x) {
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return StrictMath.log(x) / StrictMath.log(10);
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}
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/**
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* Calculate the cos(alpha+beta) and sin(alpha+beta) with the help of addition
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* low.
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*
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* @param c1 the cos of alpha.
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* @param s1 the sin of alpha.
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* @param c2 the cos of beta.
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* @param s2 the sin of beta.
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*
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* @return a double array with cos(alpha+beta) and sin(alpha+beta).
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*/
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public static double[] addThe(double c1, double s1, double c2, double s2) {
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double[] cs = new double[2];
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cs[0] = c1 * c2 - s1 * s2;
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cs[1] = s1 * c2 + c1 * s2;
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return cs;
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}
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}
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