JSci.maths.CoordinateMath Maven / Gradle / Ivy

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JSci is a set of open source Java packages. The aim is to encapsulate scientific methods/principles in the most natural way possible. As such they should greatly aid the development of scientific based software. It offers: abstract math interfaces, linear algebra (support for various matrix and vector types), statistics (including probability distributions), wavelets, newtonian mechanics, chart/graph components (AWT and Swing), MathML DOM implementation, ... Note: some packages, like javax.comm, for the astro and instruments package aren't listed as dependencies (not available).

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package JSci.maths;

/**
* The coordinate transformation math library.
* Provides common coordinate tranformations.
* This class cannot be subclassed or instantiated because all methods are static.
* @version 1.1
* @author Mark Hale
*/
public final class CoordinateMath extends AbstractMath {
        private CoordinateMath() {}

        /**
        * Converts cartesian coordinates to polar coordinates.
        * @return an array with [0] containing the radius and [1] containing the angle.
        */
        public static double[] cartesianToPolar(double x,double y) {
                final double rtheta[]=new double[2];
                final double xAbs=Math.abs(x);
                final double yAbs=Math.abs(y);
                if(xAbs==0.0 && yAbs==0.0)
                        rtheta[0]=0.0;
                else if(xAbs